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Merge remote-tracking branch 'remotes/powerpc/topic/ppc-kvm' into kvm-ppc-next

Browse Source 
This merges in the POWER9 radix MMU host and guest support, which
was put into a topic branch because it touches both powerpc and
KVM code.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras 2017-01-31 19:21:26 +11:00
commit 167c76e055
33 changed files with 1585 additions and 183 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

83
Documentation/virtual/kvm/api.txt
View File

@ -3201,6 +3201,71 @@ struct kvm_reinject_control {
pit_reinject = 0 (!reinject mode) is recommended, unless running an old
operating system that uses the PIT for timing (e.g. Linux 2.4.x).
4.99 KVM_PPC_CONFIGURE_V3_MMU
Capability: KVM_CAP_PPC_RADIX_MMU or KVM_CAP_PPC_HASH_MMU_V3
Architectures: ppc
Type: vm ioctl
Parameters: struct kvm_ppc_mmuv3_cfg (in)
Returns: 0 on success,
-EFAULT if struct kvm_ppc_mmuv3_cfg cannot be read,
-EINVAL if the configuration is invalid
This ioctl controls whether the guest will use radix or HPT (hashed
page table) translation, and sets the pointer to the process table for
the guest.
struct kvm_ppc_mmuv3_cfg {
__u64 flags;
__u64 process_table;
};
There are two bits that can be set in flags; KVM_PPC_MMUV3_RADIX and
KVM_PPC_MMUV3_GTSE. KVM_PPC_MMUV3_RADIX, if set, configures the guest
to use radix tree translation, and if clear, to use HPT translation.
KVM_PPC_MMUV3_GTSE, if set and if KVM permits it, configures the guest
to be able to use the global TLB and SLB invalidation instructions;
if clear, the guest may not use these instructions.
The process_table field specifies the address and size of the guest
process table, which is in the guest's space. This field is formatted
as the second doubleword of the partition table entry, as defined in
the Power ISA V3.00, Book III section 5.7.6.1.
4.100 KVM_PPC_GET_RMMU_INFO
Capability: KVM_CAP_PPC_RADIX_MMU
Architectures: ppc
Type: vm ioctl
Parameters: struct kvm_ppc_rmmu_info (out)
Returns: 0 on success,
-EFAULT if struct kvm_ppc_rmmu_info cannot be written,
-EINVAL if no useful information can be returned
This ioctl returns a structure containing two things: (a) a list
containing supported radix tree geometries, and (b) a list that maps
page sizes to put in the "AP" (actual page size) field for the tlbie
(TLB invalidate entry) instruction.
struct kvm_ppc_rmmu_info {
struct kvm_ppc_radix_geom {
__u8 page_shift;
__u8 level_bits[4];
__u8 pad[3];
} geometries[8];
__u32 ap_encodings[8];
};
The geometries[] field gives up to 8 supported geometries for the
radix page table, in terms of the log base 2 of the smallest page
size, and the number of bits indexed at each level of the tree, from
the PTE level up to the PGD level in that order. Any unused entries
will have 0 in the page_shift field.
The ap_encodings gives the supported page sizes and their AP field
encodings, encoded with the AP value in the top 3 bits and the log
base 2 of the page size in the bottom 6 bits.
5. The kvm_run structure
------------------------
@ -3942,3 +4007,21 @@ In order to use SynIC, it has to be activated by setting this
capability via KVM_ENABLE_CAP ioctl on the vcpu fd. Note that this
will disable the use of APIC hardware virtualization even if supported
by the CPU, as it's incompatible with SynIC auto-EOI behavior.
8.3 KVM_CAP_PPC_RADIX_MMU
Architectures: ppc
This capability, if KVM_CHECK_EXTENSION indicates that it is
available, means that that the kernel can support guests using the
radix MMU defined in Power ISA V3.00 (as implemented in the POWER9
processor).
8.4 KVM_CAP_PPC_HASH_MMU_V3
Architectures: ppc
This capability, if KVM_CHECK_EXTENSION indicates that it is
available, means that that the kernel can support guests using the
hashed page table MMU defined in Power ISA V3.00 (as implemented in
the POWER9 processor), including in-memory segment tables.

18
arch/powerpc/include/asm/book3s/64/mmu.h
View File

@ -44,10 +44,20 @@ struct patb_entry {
};
extern struct patb_entry *partition_tb;
/* Bits in patb0 field */
#define PATB_HR (1UL << 63)
#define PATB_GR (1UL << 63)
#define RPDB_MASK 0x0ffffffffffff00fUL
#define RPDB_SHIFT (1UL << 8)
#define RTS1_SHIFT 61 /* top 2 bits of radix tree size */
#define RTS1_MASK (3UL << RTS1_SHIFT)
#define RTS2_SHIFT 5 /* bottom 3 bits of radix tree size */
#define RTS2_MASK (7UL << RTS2_SHIFT)
#define RPDS_MASK 0x1f /* root page dir. size field */
/* Bits in patb1 field */
#define PATB_GR (1UL << 63) /* guest uses radix; must match HR */
#define PRTS_MASK 0x1f /* process table size field */
/*
* Limit process table to PAGE_SIZE table. This
* also limit the max pid we can support.
@ -138,5 +148,11 @@ static inline void setup_initial_memory_limit(phys_addr_t first_memblock_base,
extern int (*register_process_table)(unsigned long base, unsigned long page_size,
unsigned long tbl_size);
#ifdef CONFIG_PPC_PSERIES
extern void radix_init_pseries(void);
#else
static inline void radix_init_pseries(void) { };
#endif
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_BOOK3S_64_MMU_H_ */

75
arch/powerpc/include/asm/exception-64s.h
View File

@ -97,6 +97,15 @@
ld reg,PACAKBASE(r13); \
ori reg,reg,(ABS_ADDR(label))@l;
/*
* Branches from unrelocated code (e.g., interrupts) to labels outside
* head-y require >64K offsets.
*/
#define __LOAD_FAR_HANDLER(reg, label) \
ld reg,PACAKBASE(r13); \
ori reg,reg,(ABS_ADDR(label))@l; \
addis reg,reg,(ABS_ADDR(label))@h;
/* Exception register prefixes */
#define EXC_HV H
#define EXC_STD
@ -227,13 +236,41 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
mtctr reg; \
bctr
/*
* KVM requires __LOAD_FAR_HANDLER.
*
* __BRANCH_TO_KVM_EXIT branches are also a special case because they
* explicitly use r9 then reload it from PACA before branching. Hence
* the double-underscore.
*/
#define __BRANCH_TO_KVM_EXIT(area, label) \
mfctr r9; \
std r9,HSTATE_SCRATCH1(r13); \
__LOAD_FAR_HANDLER(r9, label); \
mtctr r9; \
ld r9,area+EX_R9(r13); \
bctr
#define BRANCH_TO_KVM(reg, label) \
__LOAD_FAR_HANDLER(reg, label); \
mtctr reg; \
bctr
#else
#define BRANCH_TO_COMMON(reg, label) \
b label
#define BRANCH_TO_KVM(reg, label) \
b label
#define __BRANCH_TO_KVM_EXIT(area, label) \
ld r9,area+EX_R9(r13); \
b label
#endif
#define __KVM_HANDLER_PROLOG(area, n) \
#define __KVM_HANDLER(area, h, n) \
BEGIN_FTR_SECTION_NESTED(947) \
ld r10,area+EX_CFAR(r13); \
std r10,HSTATE_CFAR(r13); \
@ -243,30 +280,28 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
std r10,HSTATE_PPR(r13); \
END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948); \
ld r10,area+EX_R10(r13); \
stw r9,HSTATE_SCRATCH1(r13); \
ld r9,area+EX_R9(r13); \
std r12,HSTATE_SCRATCH0(r13); \
#define __KVM_HANDLER(area, h, n) \
__KVM_HANDLER_PROLOG(area, n) \
li r12,n; \
b kvmppc_interrupt
sldi r12,r9,32; \
ori r12,r12,(n); \
/* This reloads r9 before branching to kvmppc_interrupt */ \
__BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt)
#define __KVM_HANDLER_SKIP(area, h, n) \
cmpwi r10,KVM_GUEST_MODE_SKIP; \
ld r10,area+EX_R10(r13); \
beq 89f; \
stw r9,HSTATE_SCRATCH1(r13); \
BEGIN_FTR_SECTION_NESTED(948) \
ld r9,area+EX_PPR(r13); \
std r9,HSTATE_PPR(r13); \
ld r10,area+EX_PPR(r13); \
std r10,HSTATE_PPR(r13); \
END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948); \
ld r9,area+EX_R9(r13); \
ld r10,area+EX_R10(r13); \
std r12,HSTATE_SCRATCH0(r13); \
li r12,n; \
b kvmppc_interrupt; \
sldi r12,r9,32; \
ori r12,r12,(n); \
/* This reloads r9 before branching to kvmppc_interrupt */ \
__BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt); \
89: mtocrf 0x80,r9; \
ld r9,area+EX_R9(r13); \
ld r10,area+EX_R10(r13); \
b kvmppc_skip_##h##interrupt
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
@ -393,12 +428,12 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_STD)
#define STD_RELON_EXCEPTION_HV(loc, vec, label) \
/* No guest interrupts come through here */ \
SET_SCRATCH0(r13); /* save r13 */ \
EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, EXC_HV, NOTEST, vec);
EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, \
EXC_HV, KVMTEST_HV, vec);
#define STD_RELON_EXCEPTION_HV_OOL(vec, label) \
EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec); \
EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec); \
EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
/* This associate vector numbers with bits in paca->irq_happened */
@ -475,10 +510,10 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
#define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label) \
_MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, \
EXC_HV, SOFTEN_NOTEST_HV)
EXC_HV, SOFTEN_TEST_HV)
#define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label) \
EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_HV, vec); \
EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec); \
EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
/*

2
arch/powerpc/include/asm/head-64.h
View File

@ -218,7 +218,7 @@ name:
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
#define TRAMP_KVM_BEGIN(name) \
TRAMP_REAL_BEGIN(name)
TRAMP_VIRT_BEGIN(name)
#else
#define TRAMP_KVM_BEGIN(name)
#endif

11
arch/powerpc/include/asm/hvcall.h
View File

@ -276,6 +276,7 @@
#define H_GET_MPP_X 0x314
#define H_SET_MODE 0x31C
#define H_CLEAR_HPT 0x358
#define H_REGISTER_PROC_TBL 0x37C
#define H_SIGNAL_SYS_RESET 0x380
#define MAX_HCALL_OPCODE H_SIGNAL_SYS_RESET
@ -313,6 +314,16 @@
#define H_SIGNAL_SYS_RESET_ALL_OTHERS -2
/* >= 0 values are CPU number */
/* Flag values used in H_REGISTER_PROC_TBL hcall */
#define PROC_TABLE_OP_MASK 0x18
#define PROC_TABLE_DEREG 0x10
#define PROC_TABLE_NEW 0x18
#define PROC_TABLE_TYPE_MASK 0x06
#define PROC_TABLE_HPT_SLB 0x00
#define PROC_TABLE_HPT_PT 0x02
#define PROC_TABLE_RADIX 0x04
#define PROC_TABLE_GTSE 0x01
#ifndef __ASSEMBLY__
/**

26
arch/powerpc/include/asm/kvm_book3s.h
View File

@ -170,6 +170,8 @@ extern int kvmppc_book3s_hv_page_fault(struct kvm_run *run,
unsigned long status);
extern long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr,
unsigned long slb_v, unsigned long valid);
extern int kvmppc_hv_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned long gpa, gva_t ea, int is_store);
extern void kvmppc_mmu_hpte_cache_map(struct kvm_vcpu *vcpu, struct hpte_cache *pte);
extern struct hpte_cache *kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu);
@ -182,6 +184,25 @@ extern void kvmppc_mmu_hpte_sysexit(void);
extern int kvmppc_mmu_hv_init(void);
extern int kvmppc_book3s_hcall_implemented(struct kvm *kvm, unsigned long hc);
extern int kvmppc_book3s_radix_page_fault(struct kvm_run *run,
struct kvm_vcpu *vcpu,
unsigned long ea, unsigned long dsisr);
extern int kvmppc_mmu_radix_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
struct kvmppc_pte *gpte, bool data, bool iswrite);
extern int kvmppc_init_vm_radix(struct kvm *kvm);
extern void kvmppc_free_radix(struct kvm *kvm);
extern int kvmppc_radix_init(void);
extern void kvmppc_radix_exit(void);
extern int kvm_unmap_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gfn);
extern int kvm_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gfn);
extern int kvm_test_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gfn);
extern long kvmppc_hv_get_dirty_log_radix(struct kvm *kvm,
struct kvm_memory_slot *memslot, unsigned long *map);
extern int kvmhv_get_rmmu_info(struct kvm *kvm, struct kvm_ppc_rmmu_info *info);
/* XXX remove this export when load_last_inst() is generic */
extern int kvmppc_ld(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr, bool data);
extern void kvmppc_book3s_queue_irqprio(struct kvm_vcpu *vcpu, unsigned int vec);
@ -211,8 +232,11 @@ extern long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags,
extern long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
unsigned long pte_index, unsigned long avpn,
unsigned long *hpret);
extern long kvmppc_hv_get_dirty_log(struct kvm *kvm,
extern long kvmppc_hv_get_dirty_log_hpt(struct kvm *kvm,
struct kvm_memory_slot *memslot, unsigned long *map);
extern void kvmppc_harvest_vpa_dirty(struct kvmppc_vpa *vpa,
struct kvm_memory_slot *memslot,
unsigned long *map);
extern void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr,
unsigned long mask);
extern void kvmppc_set_fscr(struct kvm_vcpu *vcpu, u64 fscr);

6
arch/powerpc/include/asm/kvm_book3s_64.h
View File

@ -36,6 +36,12 @@ static inline void svcpu_put(struct kvmppc_book3s_shadow_vcpu *svcpu)
#endif
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
static inline bool kvm_is_radix(struct kvm *kvm)
{
return kvm->arch.radix;
}
#define KVM_DEFAULT_HPT_ORDER 24 /* 16MB HPT by default */
#endif

6
arch/powerpc/include/asm/kvm_host.h
View File

@ -263,7 +263,11 @@ struct kvm_arch {
unsigned long hpt_mask;
atomic_t hpte_mod_interest;
cpumask_t need_tlb_flush;
cpumask_t cpu_in_guest;
int hpt_cma_alloc;
u8 radix;
pgd_t *pgtable;
u64 process_table;
struct dentry *debugfs_dir;
struct dentry *htab_dentry;
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
@ -603,6 +607,7 @@ struct kvm_vcpu_arch {
ulong fault_dar;
u32 fault_dsisr;
unsigned long intr_msr;
ulong fault_gpa; /* guest real address of page fault (POWER9) */
#endif
#ifdef CONFIG_BOOKE
@ -657,6 +662,7 @@ struct kvm_vcpu_arch {
int state;
int ptid;
int thread_cpu;
int prev_cpu;
bool timer_running;
wait_queue_head_t cpu_run;

2
arch/powerpc/include/asm/kvm_ppc.h
View File

@ -291,6 +291,8 @@ struct kvmppc_ops {
struct irq_bypass_producer *);
void (*irq_bypass_del_producer)(struct irq_bypass_consumer *,
struct irq_bypass_producer *);
int (*configure_mmu)(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg);
int (*get_rmmu_info)(struct kvm *kvm, struct kvm_ppc_rmmu_info *info);
};
extern struct kvmppc_ops *kvmppc_hv_ops;

17
arch/powerpc/include/asm/prom.h
View File

@ -121,6 +121,8 @@ struct of_drconf_cell {
#define OV1_PPC_2_06 0x02 /* set if we support PowerPC 2.06 */
#define OV1_PPC_2_07 0x01 /* set if we support PowerPC 2.07 */
#define OV1_PPC_3_00 0x80 /* set if we support PowerPC 3.00 */
/* Option vector 2: Open Firmware options supported */
#define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */
@ -151,10 +153,17 @@ struct of_drconf_cell {
#define OV5_XCMO 0x0440 /* Page Coalescing */
#define OV5_TYPE1_AFFINITY 0x0580 /* Type 1 NUMA affinity */
#define OV5_PRRN 0x0540 /* Platform Resource Reassignment */
#define OV5_PFO_HW_RNG 0x0E80 /* PFO Random Number Generator */
#define OV5_PFO_HW_842 0x0E40 /* PFO Compression Accelerator */
#define OV5_PFO_HW_ENCR 0x0E20 /* PFO Encryption Accelerator */
#define OV5_SUB_PROCESSORS 0x0F01 /* 1,2,or 4 Sub-Processors supported */
#define OV5_PFO_HW_RNG 0x1180 /* PFO Random Number Generator */
#define OV5_PFO_HW_842 0x1140 /* PFO Compression Accelerator */
#define OV5_PFO_HW_ENCR 0x1120 /* PFO Encryption Accelerator */
#define OV5_SUB_PROCESSORS 0x1501 /* 1,2,or 4 Sub-Processors supported */
#define OV5_XIVE_EXPLOIT 0x1701 /* XIVE exploitation supported */
#define OV5_MMU_RADIX_300 0x1880 /* ISA v3.00 radix MMU supported */
#define OV5_MMU_HASH_300 0x1840 /* ISA v3.00 hash MMU supported */
#define OV5_MMU_SEGM_RADIX 0x1820 /* radix mode (no segmentation) */
#define OV5_MMU_PROC_TBL 0x1810 /* hcall selects SLB or proc table */
#define OV5_MMU_SLB 0x1800 /* always use SLB */
#define OV5_MMU_GTSE 0x1808 /* Guest translation shootdown */
/* Option Vector 6: IBM PAPR hints */
#define OV6_LINUX 0x02 /* Linux is our OS */

4
arch/powerpc/include/asm/reg.h
View File

@ -274,10 +274,14 @@
#define SPRN_DSISR 0x012 /* Data Storage Interrupt Status Register */
#define DSISR_NOHPTE 0x40000000 /* no translation found */
#define DSISR_PROTFAULT 0x08000000 /* protection fault */
#define DSISR_BADACCESS 0x04000000 /* bad access to CI or G */
#define DSISR_ISSTORE 0x02000000 /* access was a store */
#define DSISR_DABRMATCH 0x00400000 /* hit data breakpoint */
#define DSISR_NOSEGMENT 0x00200000 /* SLB miss */
#define DSISR_KEYFAULT 0x00200000 /* Key fault */
#define DSISR_UNSUPP_MMU 0x00080000 /* Unsupported MMU config */
#define DSISR_SET_RC 0x00040000 /* Failed setting of R/C bits */
#define DSISR_PGDIRFAULT 0x00020000 /* Fault on page directory */
#define SPRN_TBRL 0x10C /* Time Base Read Lower Register (user, R/O) */
#define SPRN_TBRU 0x10D /* Time Base Read Upper Register (user, R/O) */
#define SPRN_CIR 0x11B /* Chip Information Register (hyper, R/0) */

20
arch/powerpc/include/uapi/asm/kvm.h
View File

@ -413,6 +413,26 @@ struct kvm_get_htab_header {
__u16 n_invalid;
};
/* For KVM_PPC_CONFIGURE_V3_MMU */
struct kvm_ppc_mmuv3_cfg {
__u64 flags;
__u64 process_table; /* second doubleword of partition table entry */
};
/* Flag values for KVM_PPC_CONFIGURE_V3_MMU */
#define KVM_PPC_MMUV3_RADIX 1 /* 1 = radix mode, 0 = HPT */
#define KVM_PPC_MMUV3_GTSE 2 /* global translation shootdown enb. */
/* For KVM_PPC_GET_RMMU_INFO */
struct kvm_ppc_rmmu_info {
struct kvm_ppc_radix_geom {
__u8 page_shift;
__u8 level_bits[4];
__u8 pad[3];
} geometries[8];
__u32 ap_encodings[8];
};
/* Per-vcpu XICS interrupt controller state */
#define KVM_REG_PPC_ICP_STATE (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x8c)

2
arch/powerpc/kernel/asm-offsets.c
View File

@ -498,6 +498,7 @@ int main(void)
DEFINE(KVM_NEED_FLUSH, offsetof(struct kvm, arch.need_tlb_flush.bits));
DEFINE(KVM_ENABLED_HCALLS, offsetof(struct kvm, arch.enabled_hcalls));
DEFINE(KVM_VRMA_SLB_V, offsetof(struct kvm, arch.vrma_slb_v));
DEFINE(KVM_RADIX, offsetof(struct kvm, arch.radix));
DEFINE(VCPU_DSISR, offsetof(struct kvm_vcpu, arch.shregs.dsisr));
DEFINE(VCPU_DAR, offsetof(struct kvm_vcpu, arch.shregs.dar));
DEFINE(VCPU_VPA, offsetof(struct kvm_vcpu, arch.vpa.pinned_addr));
@ -537,6 +538,7 @@ int main(void)
DEFINE(VCPU_SLB_NR, offsetof(struct kvm_vcpu, arch.slb_nr));
DEFINE(VCPU_FAULT_DSISR, offsetof(struct kvm_vcpu, arch.fault_dsisr));
DEFINE(VCPU_FAULT_DAR, offsetof(struct kvm_vcpu, arch.fault_dar));
DEFINE(VCPU_FAULT_GPA, offsetof(struct kvm_vcpu, arch.fault_gpa));
DEFINE(VCPU_INTR_MSR, offsetof(struct kvm_vcpu, arch.intr_msr));
DEFINE(VCPU_LAST_INST, offsetof(struct kvm_vcpu, arch.last_inst));
DEFINE(VCPU_TRAP, offsetof(struct kvm_vcpu, arch.trap));

61
arch/powerpc/kernel/exceptions-64s.S
View File

@ -142,7 +142,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)
lbz r0,HSTATE_HWTHREAD_REQ(r13)
cmpwi r0,0
beq 1f
b kvm_start_guest
BRANCH_TO_KVM(r10, kvm_start_guest)
1:
#endif
@ -717,13 +717,9 @@ hardware_interrupt_hv:
BEGIN_FTR_SECTION
_MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt_common,
EXC_HV, SOFTEN_TEST_HV)
do_kvm_H0x500:
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
FTR_SECTION_ELSE
_MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt_common,
EXC_STD, SOFTEN_TEST_PR)
do_kvm_0x500:
KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
EXC_REAL_END(hardware_interrupt, 0x500, 0x600)
@ -737,6 +733,8 @@ hardware_interrupt_relon_hv:
ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
EXC_VIRT_END(hardware_interrupt, 0x4500, 0x4600)
TRAMP_KVM(PACA_EXGEN, 0x500)
TRAMP_KVM_HV(PACA_EXGEN, 0x500)
EXC_COMMON_ASYNC(hardware_interrupt_common, 0x500, do_IRQ)
@ -832,6 +830,31 @@ EXC_VIRT(trap_0b, 0x4b00, 0x4c00, 0xb00)
TRAMP_KVM(PACA_EXGEN, 0xb00)
EXC_COMMON(trap_0b_common, 0xb00, unknown_exception)
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
/*
* If CONFIG_KVM_BOOK3S_64_HANDLER is set, save the PPR (on systems
* that support it) before changing to HMT_MEDIUM. That allows the KVM
* code to save that value into the guest state (it is the guest's PPR
* value). Otherwise just change to HMT_MEDIUM as userspace has
* already saved the PPR.
*/
#define SYSCALL_KVMTEST \
SET_SCRATCH0(r13); \
GET_PACA(r13); \
std r9,PACA_EXGEN+EX_R9(r13); \
OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR); \
HMT_MEDIUM; \
std r10,PACA_EXGEN+EX_R10(r13); \
OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r9, CPU_FTR_HAS_PPR); \
mfcr r9; \
KVMTEST_PR(0xc00); \
GET_SCRATCH0(r13)
#else
#define SYSCALL_KVMTEST \
HMT_MEDIUM
#endif
#define LOAD_SYSCALL_HANDLER(reg) \
__LOAD_HANDLER(reg, system_call_common)
@ -885,34 +908,14 @@ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \
#endif
EXC_REAL_BEGIN(system_call, 0xc00, 0xd00)
/*
* If CONFIG_KVM_BOOK3S_64_HANDLER is set, save the PPR (on systems
* that support it) before changing to HMT_MEDIUM. That allows the KVM
* code to save that value into the guest state (it is the guest's PPR
* value). Otherwise just change to HMT_MEDIUM as userspace has
* already saved the PPR.
*/
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
SET_SCRATCH0(r13)
GET_PACA(r13)
std r9,PACA_EXGEN+EX_R9(r13)
OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);
HMT_MEDIUM;
std r10,PACA_EXGEN+EX_R10(r13)
OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r9, CPU_FTR_HAS_PPR);
mfcr r9
KVMTEST_PR(0xc00)
GET_SCRATCH0(r13)
#else
HMT_MEDIUM;
#endif
SYSCALL_KVMTEST
SYSCALL_PSERIES_1
SYSCALL_PSERIES_2_RFID
SYSCALL_PSERIES_3
EXC_REAL_END(system_call, 0xc00, 0xd00)
EXC_VIRT_BEGIN(system_call, 0x4c00, 0x4d00)
HMT_MEDIUM
SYSCALL_KVMTEST
SYSCALL_PSERIES_1
SYSCALL_PSERIES_2_DIRECT
SYSCALL_PSERIES_3
@ -927,7 +930,7 @@ TRAMP_KVM(PACA_EXGEN, 0xd00)
EXC_COMMON(single_step_common, 0xd00, single_step_exception)
EXC_REAL_OOL_HV(h_data_storage, 0xe00, 0xe20)
EXC_VIRT_NONE(0x4e00, 0x4e20)
EXC_VIRT_OOL_HV(h_data_storage, 0x4e00, 0x4e20, 0xe00)
TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0xe00)
EXC_COMMON_BEGIN(h_data_storage_common)
mfspr r10,SPRN_HDAR
@ -943,7 +946,7 @@ EXC_COMMON_BEGIN(h_data_storage_common)
EXC_REAL_OOL_HV(h_instr_storage, 0xe20, 0xe40)
EXC_VIRT_NONE(0x4e20, 0x4e40)
EXC_VIRT_OOL_HV(h_instr_storage, 0x4e20, 0x4e40, 0xe20)
TRAMP_KVM_HV(PACA_EXGEN, 0xe20)
EXC_COMMON(h_instr_storage_common, 0xe20, unknown_exception)

18
arch/powerpc/kernel/prom_init.c
View File

@ -649,6 +649,7 @@ static void __init early_cmdline_parse(void)
struct option_vector1 {
u8 byte1;
u8 arch_versions;
u8 arch_versions3;
} __packed;
struct option_vector2 {
@ -691,6 +692,9 @@ struct option_vector5 {
u8 reserved2;
__be16 reserved3;
u8 subprocessors;
u8 byte22;
u8 intarch;
u8 mmu;
} __packed;
struct option_vector6 {
@ -700,7 +704,7 @@ struct option_vector6 {
} __packed;
struct ibm_arch_vec {
struct { u32 mask, val; } pvrs[10];
struct { u32 mask, val; } pvrs[12];
u8 num_vectors;
@ -749,6 +753,14 @@ struct ibm_arch_vec __cacheline_aligned ibm_architecture_vec = {
.mask = cpu_to_be32(0xffff0000), /* POWER8 */
.val = cpu_to_be32(0x004d0000),
},
{
.mask = cpu_to_be32(0xffff0000), /* POWER9 */
.val = cpu_to_be32(0x004e0000),
},
{
.mask = cpu_to_be32(0xffffffff), /* all 3.00-compliant */
.val = cpu_to_be32(0x0f000005),
},
{
.mask = cpu_to_be32(0xffffffff), /* all 2.07-compliant */
.val = cpu_to_be32(0x0f000004),
@ -774,6 +786,7 @@ struct ibm_arch_vec __cacheline_aligned ibm_architecture_vec = {
.byte1 = 0,
.arch_versions = OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
.arch_versions3 = OV1_PPC_3_00,
},
.vec2_len = VECTOR_LENGTH(sizeof(struct option_vector2)),
@ -836,6 +849,9 @@ struct ibm_arch_vec __cacheline_aligned ibm_architecture_vec = {
.reserved2 = 0,
.reserved3 = 0,
.subprocessors = 1,
.intarch = 0,
.mmu = OV5_FEAT(OV5_MMU_RADIX_300) | OV5_FEAT(OV5_MMU_HASH_300) |
OV5_FEAT(OV5_MMU_PROC_TBL) | OV5_FEAT(OV5_MMU_GTSE),
},
/* option vector 6: IBM PAPR hints */

3
arch/powerpc/kvm/Makefile
View File

@ -70,7 +70,8 @@ endif
kvm-hv-y += \
book3s_hv.o \
book3s_hv_interrupts.o \
book3s_64_mmu_hv.o
book3s_64_mmu_hv.o \
book3s_64_mmu_radix.o
kvm-book3s_64-builtin-xics-objs-$(CONFIG_KVM_XICS) := \
book3s_hv_rm_xics.o

1
arch/powerpc/kvm/book3s.c
View File

@ -239,6 +239,7 @@ void kvmppc_core_queue_data_storage(struct kvm_vcpu *vcpu, ulong dar,
kvmppc_set_dsisr(vcpu, flags);
kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_DATA_STORAGE);
}
EXPORT_SYMBOL_GPL(kvmppc_core_queue_data_storage); /* used by kvm_hv */
void kvmppc_core_queue_inst_storage(struct kvm_vcpu *vcpu, ulong flags)
{

110
arch/powerpc/kvm/book3s_64_mmu_hv.c
View File

@ -119,6 +119,9 @@ long kvmppc_alloc_reset_hpt(struct kvm *kvm, u32 *htab_orderp)
long err = -EBUSY;
long order;
if (kvm_is_radix(kvm))
return -EINVAL;
mutex_lock(&kvm->lock);
if (kvm->arch.hpte_setup_done) {
kvm->arch.hpte_setup_done = 0;
@ -152,12 +155,11 @@ long kvmppc_alloc_reset_hpt(struct kvm *kvm, u32 *htab_orderp)
void kvmppc_free_hpt(struct kvm *kvm)
{
kvmppc_free_lpid(kvm->arch.lpid);
vfree(kvm->arch.revmap);
if (kvm->arch.hpt_cma_alloc)
kvm_release_hpt(virt_to_page(kvm->arch.hpt_virt),
1 << (kvm->arch.hpt_order - PAGE_SHIFT));
else
else if (kvm->arch.hpt_virt)
free_pages(kvm->arch.hpt_virt,
kvm->arch.hpt_order - PAGE_SHIFT);
}
@ -392,8 +394,8 @@ static int instruction_is_store(unsigned int instr)
return (instr & mask) != 0;
}
static int kvmppc_hv_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned long gpa, gva_t ea, int is_store)
int kvmppc_hv_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned long gpa, gva_t ea, int is_store)
{
u32 last_inst;
@ -458,6 +460,9 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned long rcbits;
long mmio_update;
if (kvm_is_radix(kvm))
return kvmppc_book3s_radix_page_fault(run, vcpu, ea, dsisr);
/*
* Real-mode code has already searched the HPT and found the
* entry we're interested in. Lock the entry and check that
@ -695,12 +700,13 @@ static void kvmppc_rmap_reset(struct kvm *kvm)
srcu_read_unlock(&kvm->srcu, srcu_idx);
}
typedef int (*hva_handler_fn)(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gfn);
static int kvm_handle_hva_range(struct kvm *kvm,
unsigned long start,
unsigned long end,
int (*handler)(struct kvm *kvm,
unsigned long *rmapp,
unsigned long gfn))
hva_handler_fn handler)
{
int ret;
int retval = 0;
@ -725,9 +731,7 @@ static int kvm_handle_hva_range(struct kvm *kvm,
gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
for (; gfn < gfn_end; ++gfn) {
gfn_t gfn_offset = gfn - memslot->base_gfn;
ret = handler(kvm, &memslot->arch.rmap[gfn_offset], gfn);
ret = handler(kvm, memslot, gfn);
retval |= ret;
}
}
@ -736,20 +740,21 @@ static int kvm_handle_hva_range(struct kvm *kvm,
}
static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
int (*handler)(struct kvm *kvm, unsigned long *rmapp,
unsigned long gfn))
hva_handler_fn handler)
{
return kvm_handle_hva_range(kvm, hva, hva + 1, handler);
}
static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp,
static int kvm_unmap_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gfn)
{
struct revmap_entry *rev = kvm->arch.revmap;
unsigned long h, i, j;
__be64 *hptep;
unsigned long ptel, psize, rcbits;
unsigned long *rmapp;
rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
for (;;) {
lock_rmap(rmapp);
if (!(*rmapp & KVMPPC_RMAP_PRESENT)) {
@ -810,26 +815,36 @@ static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp,
int kvm_unmap_hva_hv(struct kvm *kvm, unsigned long hva)
{
kvm_handle_hva(kvm, hva, kvm_unmap_rmapp);
hva_handler_fn handler;
handler = kvm_is_radix(kvm) ? kvm_unmap_radix : kvm_unmap_rmapp;
kvm_handle_hva(kvm, hva, handler);
return 0;
}
int kvm_unmap_hva_range_hv(struct kvm *kvm, unsigned long start, unsigned long end)
{
kvm_handle_hva_range(kvm, start, end, kvm_unmap_rmapp);
hva_handler_fn handler;
handler = kvm_is_radix(kvm) ? kvm_unmap_radix : kvm_unmap_rmapp;
kvm_handle_hva_range(kvm, start, end, handler);
return 0;
}
void kvmppc_core_flush_memslot_hv(struct kvm *kvm,
struct kvm_memory_slot *memslot)
{
unsigned long *rmapp;
unsigned long gfn;
unsigned long n;
unsigned long *rmapp;
rmapp = memslot->arch.rmap;
gfn = memslot->base_gfn;
for (n = memslot->npages; n; --n) {
rmapp = memslot->arch.rmap;
for (n = memslot->npages; n; --n, ++gfn) {
if (kvm_is_radix(kvm)) {
kvm_unmap_radix(kvm, memslot, gfn);
continue;
}
/*
* Testing the present bit without locking is OK because
* the memslot has been marked invalid already, and hence
@ -837,20 +852,21 @@ void kvmppc_core_flush_memslot_hv(struct kvm *kvm,
* thus the present bit can't go from 0 to 1.
*/
if (*rmapp & KVMPPC_RMAP_PRESENT)
kvm_unmap_rmapp(kvm, rmapp, gfn);
kvm_unmap_rmapp(kvm, memslot, gfn);
++rmapp;
++gfn;
}
}
static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
static int kvm_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gfn)
{
struct revmap_entry *rev = kvm->arch.revmap;
unsigned long head, i, j;
__be64 *hptep;
int ret = 0;
unsigned long *rmapp;
rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
retry:
lock_rmap(rmapp);
if (*rmapp & KVMPPC_RMAP_REFERENCED) {
@ -898,17 +914,22 @@ static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
int kvm_age_hva_hv(struct kvm *kvm, unsigned long start, unsigned long end)
{
return kvm_handle_hva_range(kvm, start, end, kvm_age_rmapp);
hva_handler_fn handler;
handler = kvm_is_radix(kvm) ? kvm_age_radix : kvm_age_rmapp;
return kvm_handle_hva_range(kvm, start, end, handler);
}
static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
static int kvm_test_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gfn)
{
struct revmap_entry *rev = kvm->arch.revmap;
unsigned long head, i, j;
unsigned long *hp;
int ret = 1;
unsigned long *rmapp;
rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
if (*rmapp & KVMPPC_RMAP_REFERENCED)
return 1;
@ -934,12 +955,18 @@ static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
int kvm_test_age_hva_hv(struct kvm *kvm, unsigned long hva)
{
return kvm_handle_hva(kvm, hva, kvm_test_age_rmapp);
hva_handler_fn handler;
handler = kvm_is_radix(kvm) ? kvm_test_age_radix : kvm_test_age_rmapp;
return kvm_handle_hva(kvm, hva, handler);
}
void kvm_set_spte_hva_hv(struct kvm *kvm, unsigned long hva, pte_t pte)
{
kvm_handle_hva(kvm, hva, kvm_unmap_rmapp);
hva_handler_fn handler;
handler = kvm_is_radix(kvm) ? kvm_unmap_radix : kvm_unmap_rmapp;
kvm_handle_hva(kvm, hva, handler);
}
static int vcpus_running(struct kvm *kvm)
@ -1040,7 +1067,7 @@ static int kvm_test_clear_dirty_npages(struct kvm *kvm, unsigned long *rmapp)
return npages_dirty;
}
static void harvest_vpa_dirty(struct kvmppc_vpa *vpa,
void kvmppc_harvest_vpa_dirty(struct kvmppc_vpa *vpa,
struct kvm_memory_slot *memslot,
unsigned long *map)
{
@ -1058,12 +1085,11 @@ static void harvest_vpa_dirty(struct kvmppc_vpa *vpa,
__set_bit_le(gfn - memslot->base_gfn, map);
}
long kvmppc_hv_get_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long *map)
long kvmppc_hv_get_dirty_log_hpt(struct kvm *kvm,
struct kvm_memory_slot *memslot, unsigned long *map)
{
unsigned long i, j;
unsigned long *rmapp;
struct kvm_vcpu *vcpu;
preempt_disable();
rmapp = memslot->arch.rmap;
@ -1079,15 +1105,6 @@ long kvmppc_hv_get_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot,
__set_bit_le(j, map);
++rmapp;
}
/* Harvest dirty bits from VPA and DTL updates */
/* Note: we never modify the SLB shadow buffer areas */
kvm_for_each_vcpu(i, vcpu, kvm) {
spin_lock(&vcpu->arch.vpa_update_lock);
harvest_vpa_dirty(&vcpu->arch.vpa, memslot, map);
harvest_vpa_dirty(&vcpu->arch.dtl, memslot, map);
spin_unlock(&vcpu->arch.vpa_update_lock);
}
preempt_enable();
return 0;
}
@ -1142,10 +1159,14 @@ void kvmppc_unpin_guest_page(struct kvm *kvm, void *va, unsigned long gpa,
srcu_idx = srcu_read_lock(&kvm->srcu);
memslot = gfn_to_memslot(kvm, gfn);
if (memslot) {
rmap = &memslot->arch.rmap[gfn - memslot->base_gfn];
lock_rmap(rmap);
*rmap |= KVMPPC_RMAP_CHANGED;
unlock_rmap(rmap);
if (!kvm_is_radix(kvm)) {
rmap = &memslot->arch.rmap[gfn - memslot->base_gfn];
lock_rmap(rmap);
*rmap |= KVMPPC_RMAP_CHANGED;
unlock_rmap(rmap);
} else if (memslot->dirty_bitmap) {
mark_page_dirty(kvm, gfn);
}
}
srcu_read_unlock(&kvm->srcu, srcu_idx);
}
@ -1675,7 +1696,10 @@ void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu)
vcpu->arch.slb_nr = 32; /* POWER7/POWER8 */
mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate;
if (kvm_is_radix(vcpu->kvm))
mmu->xlate = kvmppc_mmu_radix_xlate;
else
mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate;
mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr;
vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;

716
arch/powerpc/kvm/book3s_64_mmu_radix.c Normal file
View File

@ -0,0 +1,716 @@
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* Copyright 2016 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
*/
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/page.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
/*
* Supported radix tree geometry.
* Like p9, we support either 5 or 9 bits at the first (lowest) level,
* for a page size of 64k or 4k.
*/
static int p9_supported_radix_bits[4] = { 5, 9, 9, 13 };
int kvmppc_mmu_radix_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
struct kvmppc_pte *gpte, bool data, bool iswrite)
{
struct kvm *kvm = vcpu->kvm;
u32 pid;
int ret, level, ps;
__be64 prte, rpte;
unsigned long root, pte, index;
unsigned long rts, bits, offset;
unsigned long gpa;
unsigned long proc_tbl_size;
/* Work out effective PID */
switch (eaddr >> 62) {
case 0:
pid = vcpu->arch.pid;
break;
case 3:
pid = 0;
break;
default:
return -EINVAL;
}
proc_tbl_size = 1 << ((kvm->arch.process_table & PRTS_MASK) + 12);
if (pid * 16 >= proc_tbl_size)
return -EINVAL;
/* Read partition table to find root of tree for effective PID */
ret = kvm_read_guest(kvm, kvm->arch.process_table + pid * 16,
&prte, sizeof(prte));
if (ret)
return ret;
root = be64_to_cpu(prte);
rts = ((root & RTS1_MASK) >> (RTS1_SHIFT - 3)) |
((root & RTS2_MASK) >> RTS2_SHIFT);
bits = root & RPDS_MASK;
root = root & RPDB_MASK;
/* P9 DD1 interprets RTS (radix tree size) differently */
offset = rts + 31;
if (cpu_has_feature(CPU_FTR_POWER9_DD1))
offset -= 3;
/* current implementations only support 52-bit space */
if (offset != 52)
return -EINVAL;
for (level = 3; level >= 0; --level) {
if (level && bits != p9_supported_radix_bits[level])
return -EINVAL;
if (level == 0 && !(bits == 5 || bits == 9))
return -EINVAL;
offset -= bits;
index = (eaddr >> offset) & ((1UL << bits) - 1);
/* check that low bits of page table base are zero */
if (root & ((1UL << (bits + 3)) - 1))
return -EINVAL;
ret = kvm_read_guest(kvm, root + index * 8,
&rpte, sizeof(rpte));
if (ret)
return ret;
pte = __be64_to_cpu(rpte);
if (!(pte & _PAGE_PRESENT))
return -ENOENT;
if (pte & _PAGE_PTE)
break;
bits = pte & 0x1f;
root = pte & 0x0fffffffffffff00ul;
}
/* need a leaf at lowest level; 512GB pages not supported */
if (level < 0 || level == 3)
return -EINVAL;
/* offset is now log base 2 of the page size */
gpa = pte & 0x01fffffffffff000ul;
if (gpa & ((1ul << offset) - 1))
return -EINVAL;
gpa += eaddr & ((1ul << offset) - 1);
for (ps = MMU_PAGE_4K; ps < MMU_PAGE_COUNT; ++ps)
if (offset == mmu_psize_defs[ps].shift)
break;
gpte->page_size = ps;
gpte->eaddr = eaddr;
gpte->raddr = gpa;
/* Work out permissions */
gpte->may_read = !!(pte & _PAGE_READ);
gpte->may_write = !!(pte & _PAGE_WRITE);
gpte->may_execute = !!(pte & _PAGE_EXEC);
if (kvmppc_get_msr(vcpu) & MSR_PR) {
if (pte & _PAGE_PRIVILEGED) {
gpte->may_read = 0;
gpte->may_write = 0;
gpte->may_execute = 0;
}
} else {
if (!(pte & _PAGE_PRIVILEGED)) {
/* Check AMR/IAMR to see if strict mode is in force */
if (vcpu->arch.amr & (1ul << 62))
gpte->may_read = 0;
if (vcpu->arch.amr & (1ul << 63))
gpte->may_write = 0;
if (vcpu->arch.iamr & (1ul << 62))
gpte->may_execute = 0;
}
}
return 0;
}
#ifdef CONFIG_PPC_64K_PAGES
#define MMU_BASE_PSIZE MMU_PAGE_64K
#else
#define MMU_BASE_PSIZE MMU_PAGE_4K
#endif
static void kvmppc_radix_tlbie_page(struct kvm *kvm, unsigned long addr,
unsigned int pshift)
{
int psize = MMU_BASE_PSIZE;
if (pshift >= PMD_SHIFT)
psize = MMU_PAGE_2M;
addr &= ~0xfffUL;
addr |= mmu_psize_defs[psize].ap << 5;
asm volatile("ptesync": : :"memory");
asm volatile(PPC_TLBIE_5(%0, %1, 0, 0, 1)
: : "r" (addr), "r" (kvm->arch.lpid) : "memory");
asm volatile("ptesync": : :"memory");
}
unsigned long kvmppc_radix_update_pte(struct kvm *kvm, pte_t *ptep,
unsigned long clr, unsigned long set,
unsigned long addr, unsigned int shift)
{
unsigned long old = 0;
if (!(clr & _PAGE_PRESENT) && cpu_has_feature(CPU_FTR_POWER9_DD1) &&
pte_present(*ptep)) {
/* have to invalidate it first */
old = __radix_pte_update(ptep, _PAGE_PRESENT, 0);
kvmppc_radix_tlbie_page(kvm, addr, shift);
set |= _PAGE_PRESENT;
old &= _PAGE_PRESENT;
}
return __radix_pte_update(ptep, clr, set) | old;
}
void kvmppc_radix_set_pte_at(struct kvm *kvm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
radix__set_pte_at(kvm->mm, addr, ptep, pte, 0);
}
static struct kmem_cache *kvm_pte_cache;
static pte_t *kvmppc_pte_alloc(void)
{
return kmem_cache_alloc(kvm_pte_cache, GFP_KERNEL);
}
static void kvmppc_pte_free(pte_t *ptep)
{
kmem_cache_free(kvm_pte_cache, ptep);
}
static int kvmppc_create_pte(struct kvm *kvm, pte_t pte, unsigned long gpa,
unsigned int level, unsigned long mmu_seq)
{
pgd_t *pgd;
pud_t *pud, *new_pud = NULL;
pmd_t *pmd, *new_pmd = NULL;
pte_t *ptep, *new_ptep = NULL;
unsigned long old;
int ret;
/* Traverse the guest's 2nd-level tree, allocate new levels needed */
pgd = kvm->arch.pgtable + pgd_index(gpa);
pud = NULL;
if (pgd_present(*pgd))
pud = pud_offset(pgd, gpa);
else
new_pud = pud_alloc_one(kvm->mm, gpa);
pmd = NULL;
if (pud && pud_present(*pud))
pmd = pmd_offset(pud, gpa);
else
new_pmd = pmd_alloc_one(kvm->mm, gpa);
if (level == 0 && !(pmd && pmd_present(*pmd)))
new_ptep = kvmppc_pte_alloc();
/* Check if we might have been invalidated; let the guest retry if so */
spin_lock(&kvm->mmu_lock);
ret = -EAGAIN;
if (mmu_notifier_retry(kvm, mmu_seq))
goto out_unlock;
/* Now traverse again under the lock and change the tree */
ret = -ENOMEM;
if (pgd_none(*pgd)) {
if (!new_pud)
goto out_unlock;
pgd_populate(kvm->mm, pgd, new_pud);
new_pud = NULL;
}
pud = pud_offset(pgd, gpa);
if (pud_none(*pud)) {
if (!new_pmd)
goto out_unlock;
pud_populate(kvm->mm, pud, new_pmd);
new_pmd = NULL;
}
pmd = pmd_offset(pud, gpa);
if (pmd_large(*pmd)) {
/* Someone else has instantiated a large page here; retry */
ret = -EAGAIN;
goto out_unlock;
}
if (level == 1 && !pmd_none(*pmd)) {
/*
* There's a page table page here, but we wanted
* to install a large page. Tell the caller and let
* it try installing a normal page if it wants.
*/
ret = -EBUSY;
goto out_unlock;
}
if (level == 0) {
if (pmd_none(*pmd)) {
if (!new_ptep)
goto out_unlock;
pmd_populate(kvm->mm, pmd, new_ptep);
new_ptep = NULL;
}
ptep = pte_offset_kernel(pmd, gpa);
if (pte_present(*ptep)) {
/* PTE was previously valid, so invalidate it */
old = kvmppc_radix_update_pte(kvm, ptep, _PAGE_PRESENT,
0, gpa, 0);
kvmppc_radix_tlbie_page(kvm, gpa, 0);
if (old & _PAGE_DIRTY)
mark_page_dirty(kvm, gpa >> PAGE_SHIFT);
}
kvmppc_radix_set_pte_at(kvm, gpa, ptep, pte);
} else {
kvmppc_radix_set_pte_at(kvm, gpa, pmdp_ptep(pmd), pte);
}
ret = 0;
out_unlock:
spin_unlock(&kvm->mmu_lock);
if (new_pud)
pud_free(kvm->mm, new_pud);
if (new_pmd)
pmd_free(kvm->mm, new_pmd);
if (new_ptep)
kvmppc_pte_free(new_ptep);
return ret;
}
int kvmppc_book3s_radix_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned long ea, unsigned long dsisr)
{
struct kvm *kvm = vcpu->kvm;
unsigned long mmu_seq, pte_size;
unsigned long gpa, gfn, hva, pfn;
struct kvm_memory_slot *memslot;
struct page *page = NULL, *pages[1];
long ret, npages, ok;
unsigned int writing;
struct vm_area_struct *vma;
unsigned long flags;
pte_t pte, *ptep;
unsigned long pgflags;
unsigned int shift, level;
/* Check for unusual errors */
if (dsisr & DSISR_UNSUPP_MMU) {
pr_err("KVM: Got unsupported MMU fault\n");
return -EFAULT;
}
if (dsisr & DSISR_BADACCESS) {
/* Reflect to the guest as DSI */
pr_err("KVM: Got radix HV page fault with DSISR=%lx\n", dsisr);
kvmppc_core_queue_data_storage(vcpu, ea, dsisr);
return RESUME_GUEST;
}
/* Translate the logical address and get the page */
gpa = vcpu->arch.fault_gpa & ~0xfffUL;
gpa &= ~0xF000000000000000ul;
gfn = gpa >> PAGE_SHIFT;
if (!(dsisr & DSISR_PGDIRFAULT))
gpa |= ea & 0xfff;
memslot = gfn_to_memslot(kvm, gfn);
/* No memslot means it's an emulated MMIO region */
if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) {
if (dsisr & (DSISR_PGDIRFAULT | DSISR_BADACCESS |
DSISR_SET_RC)) {
/*
* Bad address in guest page table tree, or other
* unusual error - reflect it to the guest as DSI.
*/
kvmppc_core_queue_data_storage(vcpu, ea, dsisr);
return RESUME_GUEST;
}
return kvmppc_hv_emulate_mmio(run, vcpu, gpa, ea,
dsisr & DSISR_ISSTORE);
}
/* used to check for invalidations in progress */
mmu_seq = kvm->mmu_notifier_seq;
smp_rmb();
writing = (dsisr & DSISR_ISSTORE) != 0;
hva = gfn_to_hva_memslot(memslot, gfn);
if (dsisr & DSISR_SET_RC) {
/*
* Need to set an R or C bit in the 2nd-level tables;
* if the relevant bits aren't already set in the linux
* page tables, fall through to do the gup_fast to
* set them in the linux page tables too.
*/
ok = 0;
pgflags = _PAGE_ACCESSED;
if (writing)
pgflags |= _PAGE_DIRTY;
local_irq_save(flags);
ptep = __find_linux_pte_or_hugepte(current->mm->pgd, hva,
NULL, NULL);
if (ptep) {
pte = READ_ONCE(*ptep);
if (pte_present(pte) &&
(pte_val(pte) & pgflags) == pgflags)
ok = 1;
}
local_irq_restore(flags);
if (ok) {
spin_lock(&kvm->mmu_lock);
if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) {
spin_unlock(&kvm->mmu_lock);
return RESUME_GUEST;
}
ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable,
gpa, NULL, &shift);
if (ptep && pte_present(*ptep)) {
kvmppc_radix_update_pte(kvm, ptep, 0, pgflags,
gpa, shift);
spin_unlock(&kvm->mmu_lock);
return RESUME_GUEST;
}
spin_unlock(&kvm->mmu_lock);
}
}
ret = -EFAULT;
pfn = 0;
pte_size = PAGE_SIZE;
pgflags = _PAGE_READ | _PAGE_EXEC;
level = 0;
npages = get_user_pages_fast(hva, 1, writing, pages);
if (npages < 1) {
/* Check if it's an I/O mapping */
down_read(&current->mm->mmap_sem);
vma = find_vma(current->mm, hva);
if (vma && vma->vm_start <= hva && hva < vma->vm_end &&
(vma->vm_flags & VM_PFNMAP)) {
pfn = vma->vm_pgoff +
((hva - vma->vm_start) >> PAGE_SHIFT);
pgflags = pgprot_val(vma->vm_page_prot);
}
up_read(&current->mm->mmap_sem);
if (!pfn)
return -EFAULT;
} else {
page = pages[0];
pfn = page_to_pfn(page);
if (PageHuge(page)) {
page = compound_head(page);
pte_size <<= compound_order(page);
/* See if we can insert a 2MB large-page PTE here */
if (pte_size >= PMD_SIZE &&
(gpa & PMD_MASK & PAGE_MASK) ==
(hva & PMD_MASK & PAGE_MASK)) {
level = 1;
pfn &= ~((PMD_SIZE >> PAGE_SHIFT) - 1);
}
}
/* See if we can provide write access */
if (writing) {
/*
* We assume gup_fast has set dirty on the host PTE.
*/
pgflags |= _PAGE_WRITE;
} else {
local_irq_save(flags);
ptep = __find_linux_pte_or_hugepte(current->mm->pgd,
hva, NULL, NULL);
if (ptep && pte_write(*ptep) && pte_dirty(*ptep))
pgflags |= _PAGE_WRITE;
local_irq_restore(flags);
}
}
/*
* Compute the PTE value that we need to insert.
*/
pgflags |= _PAGE_PRESENT | _PAGE_PTE | _PAGE_ACCESSED;
if (pgflags & _PAGE_WRITE)
pgflags |= _PAGE_DIRTY;
pte = pfn_pte(pfn, __pgprot(pgflags));
/* Allocate space in the tree and write the PTE */
ret = kvmppc_create_pte(kvm, pte, gpa, level, mmu_seq);
if (ret == -EBUSY) {
/*
* There's already a PMD where wanted to install a large page;
* for now, fall back to installing a small page.
*/
level = 0;
pfn |= gfn & ((PMD_SIZE >> PAGE_SHIFT) - 1);
pte = pfn_pte(pfn, __pgprot(pgflags));
ret = kvmppc_create_pte(kvm, pte, gpa, level, mmu_seq);
}
if (ret == 0 || ret == -EAGAIN)
ret = RESUME_GUEST;
if (page) {
/*
* We drop pages[0] here, not page because page might
* have been set to the head page of a compound, but
* we have to drop the reference on the correct tail
* page to match the get inside gup()
*/
put_page(pages[0]);
}
return ret;
}
static void mark_pages_dirty(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gfn, unsigned int order)
{
unsigned long i, limit;
unsigned long *dp;
if (!memslot->dirty_bitmap)
return;
limit = 1ul << order;
if (limit < BITS_PER_LONG) {
for (i = 0; i < limit; ++i)
mark_page_dirty(kvm, gfn + i);
return;
}
dp = memslot->dirty_bitmap + (gfn - memslot->base_gfn);
limit /= BITS_PER_LONG;
for (i = 0; i < limit; ++i)
*dp++ = ~0ul;
}
/* Called with kvm->lock held */
int kvm_unmap_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gfn)
{
pte_t *ptep;
unsigned long gpa = gfn << PAGE_SHIFT;
unsigned int shift;
unsigned long old;
ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, gpa,
NULL, &shift);
if (ptep && pte_present(*ptep)) {
old = kvmppc_radix_update_pte(kvm, ptep, _PAGE_PRESENT, 0,
gpa, shift);
kvmppc_radix_tlbie_page(kvm, gpa, shift);
if (old & _PAGE_DIRTY) {
if (!shift)
mark_page_dirty(kvm, gfn);
else
mark_pages_dirty(kvm, memslot,
gfn, shift - PAGE_SHIFT);
}
}
return 0;
}
/* Called with kvm->lock held */
int kvm_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gfn)
{
pte_t *ptep;
unsigned long gpa = gfn << PAGE_SHIFT;
unsigned int shift;
int ref = 0;
ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, gpa,
NULL, &shift);
if (ptep && pte_present(*ptep) && pte_young(*ptep)) {
kvmppc_radix_update_pte(kvm, ptep, _PAGE_ACCESSED, 0,
gpa, shift);
/* XXX need to flush tlb here? */
ref = 1;
}
return ref;
}
/* Called with kvm->lock held */
int kvm_test_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gfn)
{
pte_t *ptep;
unsigned long gpa = gfn << PAGE_SHIFT;
unsigned int shift;
int ref = 0;
ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, gpa,
NULL, &shift);
if (ptep && pte_present(*ptep) && pte_young(*ptep))
ref = 1;
return ref;
}
/* Returns the number of PAGE_SIZE pages that are dirty */
static int kvm_radix_test_clear_dirty(struct kvm *kvm,
struct kvm_memory_slot *memslot, int pagenum)
{
unsigned long gfn = memslot->base_gfn + pagenum;
unsigned long gpa = gfn << PAGE_SHIFT;
pte_t *ptep;
unsigned int shift;
int ret = 0;
ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, gpa,
NULL, &shift);
if (ptep && pte_present(*ptep) && pte_dirty(*ptep)) {
ret = 1;
if (shift)
ret = 1 << (shift - PAGE_SHIFT);
kvmppc_radix_update_pte(kvm, ptep, _PAGE_DIRTY, 0,
gpa, shift);
kvmppc_radix_tlbie_page(kvm, gpa, shift);
}
return ret;
}
long kvmppc_hv_get_dirty_log_radix(struct kvm *kvm,
struct kvm_memory_slot *memslot, unsigned long *map)
{
unsigned long i, j;
unsigned long n, *p;
int npages;
/*
* Radix accumulates dirty bits in the first half of the
* memslot's dirty_bitmap area, for when pages are paged
* out or modified by the host directly. Pick up these
* bits and add them to the map.
*/
n = kvm_dirty_bitmap_bytes(memslot) / sizeof(long);
p = memslot->dirty_bitmap;
for (i = 0; i < n; ++i)
map[i] |= xchg(&p[i], 0);
for (i = 0; i < memslot->npages; i = j) {
npages = kvm_radix_test_clear_dirty(kvm, memslot, i);
/*
* Note that if npages > 0 then i must be a multiple of npages,
* since huge pages are only used to back the guest at guest
* real addresses that are a multiple of their size.
* Since we have at most one PTE covering any given guest
* real address, if npages > 1 we can skip to i + npages.
*/
j = i + 1;
if (npages)
for (j = i; npages; ++j, --npages)
__set_bit_le(j, map);
}
return 0;
}
static void add_rmmu_ap_encoding(struct kvm_ppc_rmmu_info *info,
int psize, int *indexp)
{
if (!mmu_psize_defs[psize].shift)
return;
info->ap_encodings[*indexp] = mmu_psize_defs[psize].shift |
(mmu_psize_defs[psize].ap << 29);
++(*indexp);
}
int kvmhv_get_rmmu_info(struct kvm *kvm, struct kvm_ppc_rmmu_info *info)
{
int i;
if (!radix_enabled())
return -EINVAL;
memset(info, 0, sizeof(*info));
/* 4k page size */
info->geometries[0].page_shift = 12;
info->geometries[0].level_bits[0] = 9;
for (i = 1; i < 4; ++i)
info->geometries[0].level_bits[i] = p9_supported_radix_bits[i];
/* 64k page size */
info->geometries[1].page_shift = 16;
for (i = 0; i < 4; ++i)
info->geometries[1].level_bits[i] = p9_supported_radix_bits[i];
i = 0;
add_rmmu_ap_encoding(info, MMU_PAGE_4K, &i);
add_rmmu_ap_encoding(info, MMU_PAGE_64K, &i);
add_rmmu_ap_encoding(info, MMU_PAGE_2M, &i);
add_rmmu_ap_encoding(info, MMU_PAGE_1G, &i);
return 0;
}
int kvmppc_init_vm_radix(struct kvm *kvm)
{
kvm->arch.pgtable = pgd_alloc(kvm->mm);
if (!kvm->arch.pgtable)
return -ENOMEM;
return 0;
}
void kvmppc_free_radix(struct kvm *kvm)
{
unsigned long ig, iu, im;
pte_t *pte;
pmd_t *pmd;
pud_t *pud;
pgd_t *pgd;
if (!kvm->arch.pgtable)
return;
pgd = kvm->arch.pgtable;
for (ig = 0; ig < PTRS_PER_PGD; ++ig, ++pgd) {
if (!pgd_present(*pgd))
continue;
pud = pud_offset(pgd, 0);
for (iu = 0; iu < PTRS_PER_PUD; ++iu, ++pud) {
if (!pud_present(*pud))
continue;
pmd = pmd_offset(pud, 0);
for (im = 0; im < PTRS_PER_PMD; ++im, ++pmd) {
if (pmd_huge(*pmd)) {
pmd_clear(pmd);
continue;
}
if (!pmd_present(*pmd))
continue;
pte = pte_offset_map(pmd, 0);
memset(pte, 0, sizeof(long) << PTE_INDEX_SIZE);
kvmppc_pte_free(pte);
pmd_clear(pmd);
}
pmd_free(kvm->mm, pmd_offset(pud, 0));
pud_clear(pud);
}
pud_free(kvm->mm, pud_offset(pgd, 0));
pgd_clear(pgd);
}
pgd_free(kvm->mm, kvm->arch.pgtable);
}
static void pte_ctor(void *addr)
{
memset(addr, 0, PTE_TABLE_SIZE);
}
int kvmppc_radix_init(void)
{
unsigned long size = sizeof(void *) << PTE_INDEX_SIZE;
kvm_pte_cache = kmem_cache_create("kvm-pte", size, size, 0, pte_ctor);
if (!kvm_pte_cache)
return -ENOMEM;
return 0;
}
void kvmppc_radix_exit(void)
{
kmem_cache_destroy(kvm_pte_cache);
}

205
arch/powerpc/kvm/book3s_hv.c
View File

@ -1132,7 +1132,7 @@ static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
/*
* Userspace can only modify DPFD (default prefetch depth),
* ILE (interrupt little-endian) and TC (translation control).
* On POWER8 userspace can also modify AIL (alt. interrupt loc.)
* On POWER8 and POWER9 userspace can also modify AIL (alt. interrupt loc.).
*/
mask = LPCR_DPFD | LPCR_ILE | LPCR_TC;
if (cpu_has_feature(CPU_FTR_ARCH_207S))
@ -1818,6 +1818,7 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
vcpu->arch.vcore = vcore;
vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid;
vcpu->arch.thread_cpu = -1;
vcpu->arch.prev_cpu = -1;
vcpu->arch.cpu_type = KVM_CPU_3S_64;
kvmppc_sanity_check(vcpu);
@ -1947,11 +1948,33 @@ static void kvmppc_release_hwthread(int cpu)
tpaca->kvm_hstate.kvm_split_mode = NULL;
}
static void do_nothing(void *x)
{
}
static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu)
{
int i;
cpu = cpu_first_thread_sibling(cpu);
cpumask_set_cpu(cpu, &kvm->arch.need_tlb_flush);
/*
* Make sure setting of bit in need_tlb_flush precedes
* testing of cpu_in_guest bits. The matching barrier on
* the other side is the first smp_mb() in kvmppc_run_core().
*/
smp_mb();
for (i = 0; i < threads_per_core; ++i)
if (cpumask_test_cpu(cpu + i, &kvm->arch.cpu_in_guest))
smp_call_function_single(cpu + i, do_nothing, NULL, 1);
}
static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc)
{
int cpu;
struct paca_struct *tpaca;
struct kvmppc_vcore *mvc = vc->master_vcore;
struct kvm *kvm = vc->kvm;
cpu = vc->pcpu;
if (vcpu) {
@ -1962,6 +1985,27 @@ static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc)
cpu += vcpu->arch.ptid;
vcpu->cpu = mvc->pcpu;
vcpu->arch.thread_cpu = cpu;
/*
* With radix, the guest can do TLB invalidations itself,
* and it could choose to use the local form (tlbiel) if
* it is invalidating a translation that has only ever been
* used on one vcpu. However, that doesn't mean it has
* only ever been used on one physical cpu, since vcpus
* can move around between pcpus. To cope with this, when
* a vcpu moves from one pcpu to another, we need to tell
* any vcpus running on the same core as this vcpu previously
* ran to flush the TLB. The TLB is shared between threads,
* so we use a single bit in .need_tlb_flush for all 4 threads.
*/
if (kvm_is_radix(kvm) && vcpu->arch.prev_cpu != cpu) {
if (vcpu->arch.prev_cpu >= 0 &&
cpu_first_thread_sibling(vcpu->arch.prev_cpu) !=
cpu_first_thread_sibling(cpu))
radix_flush_cpu(kvm, vcpu->arch.prev_cpu, vcpu);
vcpu->arch.prev_cpu = cpu;
}
cpumask_set_cpu(cpu, &kvm->arch.cpu_in_guest);
}
tpaca = &paca[cpu];
tpaca->kvm_hstate.kvm_vcpu = vcpu;
@ -2549,6 +2593,7 @@ static noinline void kvmppc_run_core(struct kvmppc_vcore *vc)
kvmppc_release_hwthread(pcpu + i);
if (sip && sip->napped[i])
kvmppc_ipi_thread(pcpu + i);
cpumask_clear_cpu(pcpu + i, &vc->kvm->arch.cpu_in_guest);
}
kvmppc_set_host_core(pcpu);
@ -2875,7 +2920,7 @@ static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
smp_mb();
/* On the first time here, set up HTAB and VRMA */
if (!vcpu->kvm->arch.hpte_setup_done) {
if (!kvm_is_radix(vcpu->kvm) && !vcpu->kvm->arch.hpte_setup_done) {
r = kvmppc_hv_setup_htab_rma(vcpu);
if (r)
goto out;
@ -2937,6 +2982,13 @@ static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
{
struct kvm_ppc_one_seg_page_size *sps;
/*
* Since we don't yet support HPT guests on a radix host,
* return an error if the host uses radix.
*/
if (radix_enabled())
return -EINVAL;
info->flags = KVM_PPC_PAGE_SIZES_REAL;
if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
info->flags |= KVM_PPC_1T_SEGMENTS;
@ -2959,8 +3011,10 @@ static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
{
struct kvm_memslots *slots;
struct kvm_memory_slot *memslot;
int r;
int i, r;
unsigned long n;
unsigned long *buf;
struct kvm_vcpu *vcpu;
mutex_lock(&kvm->slots_lock);
@ -2974,15 +3028,32 @@ static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
if (!memslot->dirty_bitmap)
goto out;
/*
* Use second half of bitmap area because radix accumulates
* bits in the first half.
*/
n = kvm_dirty_bitmap_bytes(memslot);
memset(memslot->dirty_bitmap, 0, n);
buf = memslot->dirty_bitmap + n / sizeof(long);
memset(buf, 0, n);
r = kvmppc_hv_get_dirty_log(kvm, memslot, memslot->dirty_bitmap);
if (kvm_is_radix(kvm))
r = kvmppc_hv_get_dirty_log_radix(kvm, memslot, buf);
else
r = kvmppc_hv_get_dirty_log_hpt(kvm, memslot, buf);
if (r)
goto out;
/* Harvest dirty bits from VPA and DTL updates */
/* Note: we never modify the SLB shadow buffer areas */
kvm_for_each_vcpu(i, vcpu, kvm) {
spin_lock(&vcpu->arch.vpa_update_lock);
kvmppc_harvest_vpa_dirty(&vcpu->arch.vpa, memslot, buf);
kvmppc_harvest_vpa_dirty(&vcpu->arch.dtl, memslot, buf);
spin_unlock(&vcpu->arch.vpa_update_lock);
}
r = -EFAULT;
if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
if (copy_to_user(log->dirty_bitmap, buf, n))
goto out;
r = 0;
@ -3003,6 +3074,15 @@ static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free,
static int kvmppc_core_create_memslot_hv(struct kvm_memory_slot *slot,
unsigned long npages)
{
/*
* For now, if radix_enabled() then we only support radix guests,
* and in that case we don't need the rmap array.
*/
if (radix_enabled()) {
slot->arch.rmap = NULL;
return 0;
}
slot->arch.rmap = vzalloc(npages * sizeof(*slot->arch.rmap));
if (!slot->arch.rmap)
return -ENOMEM;
@ -3035,7 +3115,7 @@ static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
if (npages)
atomic64_inc(&kvm->arch.mmio_update);
if (npages && old->npages) {
if (npages && old->npages && !kvm_is_radix(kvm)) {
/*
* If modifying a memslot, reset all the rmap dirty bits.
* If this is a new memslot, we don't need to do anything
@ -3044,7 +3124,7 @@ static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
*/
slots = kvm_memslots(kvm);
memslot = id_to_memslot(slots, mem->slot);
kvmppc_hv_get_dirty_log(kvm, memslot, NULL);
kvmppc_hv_get_dirty_log_hpt(kvm, memslot, NULL);
}
}
@ -3083,14 +3163,20 @@ static void kvmppc_setup_partition_table(struct kvm *kvm)
{
unsigned long dw0, dw1;
/* PS field - page size for VRMA */
dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) |
((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1);
/* HTABSIZE and HTABORG fields */
dw0 |= kvm->arch.sdr1;
if (!kvm_is_radix(kvm)) {
/* PS field - page size for VRMA */
dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) |
((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1);
/* HTABSIZE and HTABORG fields */
dw0 |= kvm->arch.sdr1;
/* Second dword has GR=0; other fields are unused since UPRT=0 */
dw1 = 0;
/* Second dword as set by userspace */
dw1 = kvm->arch.process_table;
} else {
dw0 = PATB_HR | radix__get_tree_size() |
__pa(kvm->arch.pgtable) | RADIX_PGD_INDEX_SIZE;
dw1 = PATB_GR | kvm->arch.process_table;
}
mmu_partition_table_set_entry(kvm->arch.lpid, dw0, dw1);
}
@ -3260,6 +3346,7 @@ static int kvmppc_core_init_vm_hv(struct kvm *kvm)
{
unsigned long lpcr, lpid;
char buf[32];
int ret;
/* Allocate the guest's logical partition ID */
@ -3307,13 +3394,30 @@ static int kvmppc_core_init_vm_hv(struct kvm *kvm)
lpcr |= LPCR_HVICE;
}
/*
* For now, if the host uses radix, the guest must be radix.
*/
if (radix_enabled()) {
kvm->arch.radix = 1;
lpcr &= ~LPCR_VPM1;
lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;
ret = kvmppc_init_vm_radix(kvm);
if (ret) {
kvmppc_free_lpid(kvm->arch.lpid);
return ret;
}
kvmppc_setup_partition_table(kvm);
}
kvm->arch.lpcr = lpcr;
/*
* Work out how many sets the TLB has, for the use of
* the TLB invalidation loop in book3s_hv_rmhandlers.S.
*/
if (cpu_has_feature(CPU_FTR_ARCH_300))
if (kvm_is_radix(kvm))
kvm->arch.tlb_sets = POWER9_TLB_SETS_RADIX; /* 128 */
else if (cpu_has_feature(CPU_FTR_ARCH_300))
kvm->arch.tlb_sets = POWER9_TLB_SETS_HASH; /* 256 */
else if (cpu_has_feature(CPU_FTR_ARCH_207S))
kvm->arch.tlb_sets = POWER8_TLB_SETS; /* 512 */
@ -3323,8 +3427,11 @@ static int kvmppc_core_init_vm_hv(struct kvm *kvm)
/*
* Track that we now have a HV mode VM active. This blocks secondary
* CPU threads from coming online.
* On POWER9, we only need to do this for HPT guests on a radix
* host, which is not yet supported.
*/
kvm_hv_vm_activated();
if (!cpu_has_feature(CPU_FTR_ARCH_300))
kvm_hv_vm_activated();
/*
* Create a debugfs directory for the VM
@ -3350,11 +3457,17 @@ static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
{
debugfs_remove_recursive(kvm->arch.debugfs_dir);
kvm_hv_vm_deactivated();
if (!cpu_has_feature(CPU_FTR_ARCH_300))
kvm_hv_vm_deactivated();
kvmppc_free_vcores(kvm);
kvmppc_free_hpt(kvm);
kvmppc_free_lpid(kvm->arch.lpid);
if (kvm_is_radix(kvm))
kvmppc_free_radix(kvm);
else
kvmppc_free_hpt(kvm);
kvmppc_free_pimap(kvm);
}
@ -3383,11 +3496,6 @@ static int kvmppc_core_check_processor_compat_hv(void)
if (!cpu_has_feature(CPU_FTR_HVMODE) ||
!cpu_has_feature(CPU_FTR_ARCH_206))
return -EIO;
/*
* Disable KVM for Power9 in radix mode.
*/
if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled())
return -EIO;
return 0;
}
@ -3655,6 +3763,41 @@ static void init_default_hcalls(void)
}
}
static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
{
unsigned long lpcr;
int radix;
/* If not on a POWER9, reject it */
if (!cpu_has_feature(CPU_FTR_ARCH_300))
return -ENODEV;
/* If any unknown flags set, reject it */
if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE))
return -EINVAL;
/* We can't change a guest to/from radix yet */
radix = !!(cfg->flags & KVM_PPC_MMUV3_RADIX);
if (radix != kvm_is_radix(kvm))
return -EINVAL;
/* GR (guest radix) bit in process_table field must match */
if (!!(cfg->process_table & PATB_GR) != radix)
return -EINVAL;
/* Process table size field must be reasonable, i.e. <= 24 */
if ((cfg->process_table & PRTS_MASK) > 24)
return -EINVAL;
kvm->arch.process_table = cfg->process_table;
kvmppc_setup_partition_table(kvm);
lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0;
kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE);
return 0;
}
static struct kvmppc_ops kvm_ops_hv = {
.get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
.set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
@ -3692,6 +3835,8 @@ static struct kvmppc_ops kvm_ops_hv = {
.irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv,
.irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv,
#endif
.configure_mmu = kvmhv_configure_mmu,
.get_rmmu_info = kvmhv_get_rmmu_info,
};
static int kvm_init_subcore_bitmap(void)
@ -3726,6 +3871,11 @@ static int kvm_init_subcore_bitmap(void)
return 0;
}
static int kvmppc_radix_possible(void)
{
return cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled();
}
static int kvmppc_book3s_init_hv(void)
{
int r;
@ -3765,12 +3915,19 @@ static int kvmppc_book3s_init_hv(void)
init_vcore_lists();
r = kvmppc_mmu_hv_init();
if (r)
return r;
if (kvmppc_radix_possible())
r = kvmppc_radix_init();
return r;
}
static void kvmppc_book3s_exit_hv(void)
{
kvmppc_free_host_rm_ops();
if (kvmppc_radix_possible())
kvmppc_radix_exit();
kvmppc_hv_ops = NULL;
}

38
arch/powerpc/kvm/book3s_hv_builtin.c
View File

@ -29,6 +29,11 @@
#include <asm/opal.h>
#include <asm/smp.h>
static bool in_realmode(void)
{
return !(mfmsr() & MSR_IR);
}
#define KVM_CMA_CHUNK_ORDER 18
/*
@ -200,7 +205,6 @@ static inline void rm_writeb(unsigned long paddr, u8 val)
/*
* Send an interrupt or message to another CPU.
* This can only be called in real mode.
* The caller needs to include any barrier needed to order writes
* to memory vs. the IPI/message.
*/
@ -226,7 +230,9 @@ void kvmhv_rm_send_ipi(int cpu)
/* Else poke the target with an IPI */
xics_phys = paca[cpu].kvm_hstate.xics_phys;
if (xics_phys)
if (!in_realmode())
opal_int_set_mfrr(get_hard_smp_processor_id(cpu), IPI_PRIORITY);
else if (xics_phys)
rm_writeb(xics_phys + XICS_MFRR, IPI_PRIORITY);
else
opal_rm_int_set_mfrr(get_hard_smp_processor_id(cpu),
@ -412,14 +418,15 @@ static long kvmppc_read_one_intr(bool *again)
/* Now read the interrupt from the ICP */
xics_phys = local_paca->kvm_hstate.xics_phys;
if (!xics_phys) {
/* Use OPAL to read the XIRR */
rc = 0;
if (!in_realmode())
rc = opal_int_get_xirr(&xirr, false);
else if (!xics_phys)
rc = opal_rm_int_get_xirr(&xirr, false);
if (rc < 0)
return 1;
} else {
else
xirr = _lwzcix(xics_phys + XICS_XIRR);
}
if (rc < 0)
return 1;
/*
* Save XIRR for later. Since we get control in reverse endian
@ -445,15 +452,19 @@ static long kvmppc_read_one_intr(bool *again)
* If it is an IPI, clear the MFRR and EOI it.
*/
if (xisr == XICS_IPI) {
if (xics_phys) {
rc = 0;
if (!in_realmode()) {
opal_int_set_mfrr(hard_smp_processor_id(), 0xff);
rc = opal_int_eoi(h_xirr);
} else if (xics_phys) {
_stbcix(xics_phys + XICS_MFRR, 0xff);
_stwcix(xics_phys + XICS_XIRR, xirr);
} else {
opal_rm_int_set_mfrr(hard_smp_processor_id(), 0xff);
rc = opal_rm_int_eoi(h_xirr);
/* If rc > 0, there is another interrupt pending */
*again = rc > 0;
}
/* If rc > 0, there is another interrupt pending */
*again = rc > 0;
/*
* Need to ensure side effects of above stores
@ -471,7 +482,10 @@ static long kvmppc_read_one_intr(bool *again)
/* We raced with the host,
* we need to resend that IPI, bummer
*/
if (xics_phys)
if (!in_realmode())
opal_int_set_mfrr(hard_smp_processor_id(),
IPI_PRIORITY);
else if (xics_phys)
_stbcix(xics_phys + XICS_MFRR, IPI_PRIORITY);
else
opal_rm_int_set_mfrr(hard_smp_processor_id(),

25
arch/powerpc/kvm/book3s_hv_rm_mmu.c
View File

@ -43,6 +43,7 @@ static void *real_vmalloc_addr(void *x)
static int global_invalidates(struct kvm *kvm, unsigned long flags)
{
int global;
int cpu;
/*
* If there is only one vcore, and it's currently running,
@ -60,8 +61,14 @@ static int global_invalidates(struct kvm *kvm, unsigned long flags)
/* any other core might now have stale TLB entries... */
smp_wmb();
cpumask_setall(&kvm->arch.need_tlb_flush);
cpumask_clear_cpu(local_paca->kvm_hstate.kvm_vcore->pcpu,
&kvm->arch.need_tlb_flush);
cpu = local_paca->kvm_hstate.kvm_vcore->pcpu;
/*
* On POWER9, threads are independent but the TLB is shared,
* so use the bit for the first thread to represent the core.
*/
if (cpu_has_feature(CPU_FTR_ARCH_300))
cpu = cpu_first_thread_sibling(cpu);
cpumask_clear_cpu(cpu, &kvm->arch.need_tlb_flush);
}
return global;
@ -182,6 +189,8 @@ long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags,
unsigned long mmu_seq;
unsigned long rcbits, irq_flags = 0;
if (kvm_is_radix(kvm))
return H_FUNCTION;
psize = hpte_page_size(pteh, ptel);
if (!psize)
return H_PARAMETER;
@ -458,6 +467,8 @@ long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
struct revmap_entry *rev;
u64 pte, orig_pte, pte_r;
if (kvm_is_radix(kvm))
return H_FUNCTION;
if (pte_index >= kvm->arch.hpt_npte)
return H_PARAMETER;
hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4));
@ -529,6 +540,8 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
struct revmap_entry *rev, *revs[4];
u64 hp0, hp1;
if (kvm_is_radix(kvm))
return H_FUNCTION;
global = global_invalidates(kvm, 0);
for (i = 0; i < 4 && ret == H_SUCCESS; ) {
n = 0;
@ -642,6 +655,8 @@ long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags,
unsigned long v, r, rb, mask, bits;
u64 pte_v, pte_r;
if (kvm_is_radix(kvm))
return H_FUNCTION;
if (pte_index >= kvm->arch.hpt_npte)
return H_PARAMETER;
@ -711,6 +726,8 @@ long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags,
int i, n = 1;
struct revmap_entry *rev = NULL;
if (kvm_is_radix(kvm))
return H_FUNCTION;
if (pte_index >= kvm->arch.hpt_npte)
return H_PARAMETER;
if (flags & H_READ_4) {
@ -750,6 +767,8 @@ long kvmppc_h_clear_ref(struct kvm_vcpu *vcpu, unsigned long flags,
unsigned long *rmap;
long ret = H_NOT_FOUND;
if (kvm_is_radix(kvm))
return H_FUNCTION;
if (pte_index >= kvm->arch.hpt_npte)
return H_PARAMETER;
@ -796,6 +815,8 @@ long kvmppc_h_clear_mod(struct kvm_vcpu *vcpu, unsigned long flags,
unsigned long *rmap;
long ret = H_NOT_FOUND;
if (kvm_is_radix(kvm))
return H_FUNCTION;
if (pte_index >= kvm->arch.hpt_npte)
return H_PARAMETER;

8
arch/powerpc/kvm/book3s_hv_rm_xics.c
View File

@ -62,11 +62,9 @@ static inline void icp_send_hcore_msg(int hcore, struct kvm_vcpu *vcpu)
hcpu = hcore << threads_shift;
kvmppc_host_rm_ops_hv->rm_core[hcore].rm_data = vcpu;
smp_muxed_ipi_set_message(hcpu, PPC_MSG_RM_HOST_ACTION);
if (paca[hcpu].kvm_hstate.xics_phys)
icp_native_cause_ipi_rm(hcpu);
else
opal_rm_int_set_mfrr(get_hard_smp_processor_id(hcpu),
IPI_PRIORITY);
kvmppc_set_host_ipi(hcpu, 1);
smp_mb();
kvmhv_rm_send_ipi(hcpu);
}
#else
static inline void icp_send_hcore_msg(int hcore, struct kvm_vcpu *vcpu) { }

154
arch/powerpc/kvm/book3s_hv_rmhandlers.S
View File

@ -148,6 +148,15 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
addi r1, r1, 112
ld r7, HSTATE_HOST_MSR(r13)
/*
* If we came back from the guest via a relocation-on interrupt,
* we will be in virtual mode at this point, which makes it a
* little easier to get back to the caller.
*/
mfmsr r0
andi. r0, r0, MSR_IR /* in real mode? */
bne .Lvirt_return
cmpwi cr1, r12, BOOK3S_INTERRUPT_MACHINE_CHECK
cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL
beq 11f
@ -181,6 +190,26 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
mtspr SPRN_HSRR1, r7
ba 0xe80
/* Virtual-mode return - can't get here for HMI or machine check */
.Lvirt_return:
cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL
beq 16f
cmpwi r12, BOOK3S_INTERRUPT_H_DOORBELL
beq 17f
andi. r0, r7, MSR_EE /* were interrupts hard-enabled? */
beq 18f
mtmsrd r7, 1 /* if so then re-enable them */
18: mtlr r8
blr
16: mtspr SPRN_HSRR0, r8 /* jump to reloc-on external vector */
mtspr SPRN_HSRR1, r7
b exc_virt_0x4500_hardware_interrupt
17: mtspr SPRN_HSRR0, r8
mtspr SPRN_HSRR1, r7
b exc_virt_0x4e80_h_doorbell
kvmppc_primary_no_guest:
/* We handle this much like a ceded vcpu */
/* put the HDEC into the DEC, since HDEC interrupts don't wake us */
@ -518,6 +547,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
/* Stack frame offsets */
#define STACK_SLOT_TID (112-16)
#define STACK_SLOT_PSSCR (112-24)
#define STACK_SLOT_PID (112-32)
.global kvmppc_hv_entry
kvmppc_hv_entry:
@ -530,6 +560,7 @@ kvmppc_hv_entry:
* R1 = host R1
* R2 = TOC
* all other volatile GPRS = free
* Does not preserve non-volatile GPRs or CR fields
*/
mflr r0
std r0, PPC_LR_STKOFF(r1)
@ -549,32 +580,38 @@ kvmppc_hv_entry:
bl kvmhv_start_timing
1:
#endif
/* Clear out SLB */
/* Use cr7 as an indication of radix mode */
ld r5, HSTATE_KVM_VCORE(r13)
ld r9, VCORE_KVM(r5) /* pointer to struct kvm */
lbz r0, KVM_RADIX(r9)
cmpwi cr7, r0, 0
/* Clear out SLB if hash */
bne cr7, 2f
li r6,0
slbmte r6,r6
slbia
ptesync
2:
/*
* POWER7/POWER8 host -> guest partition switch code.
* We don't have to lock against concurrent tlbies,
* but we do have to coordinate across hardware threads.
*/
/* Set bit in entry map iff exit map is zero. */
ld r5, HSTATE_KVM_VCORE(r13)
li r7, 1
lbz r6, HSTATE_PTID(r13)
sld r7, r7, r6
addi r9, r5, VCORE_ENTRY_EXIT
21: lwarx r3, 0, r9
addi r8, r5, VCORE_ENTRY_EXIT
21: lwarx r3, 0, r8
cmpwi r3, 0x100 /* any threads starting to exit? */
bge secondary_too_late /* if so we're too late to the party */
or r3, r3, r7
stwcx. r3, 0, r9
stwcx. r3, 0, r8
bne 21b
/* Primary thread switches to guest partition. */
ld r9,VCORE_KVM(r5) /* pointer to struct kvm */
cmpwi r6,0
bne 10f
lwz r7,KVM_LPID(r9)
@ -590,30 +627,44 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)
/* See if we need to flush the TLB */
lhz r6,PACAPACAINDEX(r13) /* test_bit(cpu, need_tlb_flush) */
BEGIN_FTR_SECTION
/*
* On POWER9, individual threads can come in here, but the
* TLB is shared between the 4 threads in a core, hence
* invalidating on one thread invalidates for all.
* Thus we make all 4 threads use the same bit here.
*/
clrrdi r6,r6,2
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
clrldi r7,r6,64-6 /* extract bit number (6 bits) */
srdi r6,r6,6 /* doubleword number */
sldi r6,r6,3 /* address offset */
add r6,r6,r9
addi r6,r6,KVM_NEED_FLUSH /* dword in kvm->arch.need_tlb_flush */
li r0,1
sld r0,r0,r7
li r8,1
sld r8,r8,r7
ld r7,0(r6)
and. r7,r7,r0
and. r7,r7,r8
beq 22f
23: ldarx r7,0,r6 /* if set, clear the bit */
andc r7,r7,r0
stdcx. r7,0,r6
bne 23b
/* Flush the TLB of any entries for this LPID */
lwz r6,KVM_TLB_SETS(r9)
li r0,0 /* RS for P9 version of tlbiel */
mtctr r6
lwz r0,KVM_TLB_SETS(r9)
mtctr r0
li r7,0x800 /* IS field = 0b10 */
ptesync
28: tlbiel r7
li r0,0 /* RS for P9 version of tlbiel */
bne cr7, 29f
28: tlbiel r7 /* On P9, rs=0, RIC=0, PRS=0, R=0 */
addi r7,r7,0x1000
bdnz 28b
ptesync
b 30f
29: PPC_TLBIEL(7,0,2,1,1) /* for radix, RIC=2, PRS=1, R=1 */
addi r7,r7,0x1000
bdnz 29b
30: ptesync
23: ldarx r7,0,r6 /* clear the bit after TLB flushed */
andc r7,r7,r8
stdcx. r7,0,r6
bne 23b
/* Add timebase offset onto timebase */
22: ld r8,VCORE_TB_OFFSET(r5)
@ -658,7 +709,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
beq kvmppc_primary_no_guest
kvmppc_got_guest:
/* Load up guest SLB entries */
/* Load up guest SLB entries (N.B. slb_max will be 0 for radix) */
lwz r5,VCPU_SLB_MAX(r4)
cmpwi r5,0
beq 9f
@ -696,8 +747,10 @@ kvmppc_got_guest:
BEGIN_FTR_SECTION
mfspr r5, SPRN_TIDR
mfspr r6, SPRN_PSSCR
mfspr r7, SPRN_PID
std r5, STACK_SLOT_TID(r1)
std r6, STACK_SLOT_PSSCR(r1)
std r7, STACK_SLOT_PID(r1)
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
BEGIN_FTR_SECTION
@ -823,6 +876,9 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
mtspr SPRN_BESCR, r6
mtspr SPRN_PID, r7
mtspr SPRN_WORT, r8
BEGIN_FTR_SECTION
PPC_INVALIDATE_ERAT
END_FTR_SECTION_IFSET(CPU_FTR_POWER9_DD1)
BEGIN_FTR_SECTION
/* POWER8-only registers */
ld r5, VCPU_TCSCR(r4)
@ -1057,13 +1113,13 @@ hdec_soon:
kvmppc_interrupt_hv:
/*
* Register contents:
* R12 = interrupt vector
* R12 = (guest CR << 32) | interrupt vector
* R13 = PACA
* guest CR, R12 saved in shadow VCPU SCRATCH1/0
* guest R12 saved in shadow VCPU SCRATCH0
* guest CTR saved in shadow VCPU SCRATCH1 if RELOCATABLE
* guest R13 saved in SPRN_SCRATCH0
*/
std r9, HSTATE_SCRATCH2(r13)
lbz r9, HSTATE_IN_GUEST(r13)
cmpwi r9, KVM_GUEST_MODE_HOST_HV
beq kvmppc_bad_host_intr
@ -1094,8 +1150,9 @@ kvmppc_interrupt_hv:
std r10, VCPU_GPR(R10)(r9)
std r11, VCPU_GPR(R11)(r9)
ld r3, HSTATE_SCRATCH0(r13)
lwz r4, HSTATE_SCRATCH1(r13)
std r3, VCPU_GPR(R12)(r9)
/* CR is in the high half of r12 */
srdi r4, r12, 32
stw r4, VCPU_CR(r9)
BEGIN_FTR_SECTION
ld r3, HSTATE_CFAR(r13)
@ -1114,6 +1171,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
mfspr r11, SPRN_SRR1
std r10, VCPU_SRR0(r9)
std r11, VCPU_SRR1(r9)
/* trap is in the low half of r12, clear CR from the high half */
clrldi r12, r12, 32
andi. r0, r12, 2 /* need to read HSRR0/1? */
beq 1f
mfspr r10, SPRN_HSRR0
@ -1149,7 +1208,12 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
11: stw r3,VCPU_HEIR(r9)
/* these are volatile across C function calls */
#ifdef CONFIG_RELOCATABLE
ld r3, HSTATE_SCRATCH1(r13)
mtctr r3
#else
mfctr r3
#endif
mfxer r4
std r3, VCPU_CTR(r9)
std r4, VCPU_XER(r9)
@ -1285,11 +1349,15 @@ mc_cont:
mtspr SPRN_CTRLT,r6
4:
/* Read the guest SLB and save it away */
ld r5, VCPU_KVM(r9)
lbz r0, KVM_RADIX(r5)
cmpwi r0, 0
li r5, 0
bne 3f /* for radix, save 0 entries */
lwz r0,VCPU_SLB_NR(r9) /* number of entries in SLB */
mtctr r0
li r6,0
addi r7,r9,VCPU_SLB
li r5,0
1: slbmfee r8,r6
andis. r0,r8,SLB_ESID_V@h
beq 2f
@ -1301,7 +1369,7 @@ mc_cont:
addi r5,r5,1
2: addi r6,r6,1
bdnz 1b
stw r5,VCPU_SLB_MAX(r9)
3: stw r5,VCPU_SLB_MAX(r9)
/*
* Save the guest PURR/SPURR
@ -1550,9 +1618,14 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
BEGIN_FTR_SECTION
ld r5, STACK_SLOT_TID(r1)
ld r6, STACK_SLOT_PSSCR(r1)
ld r7, STACK_SLOT_PID(r1)
mtspr SPRN_TIDR, r5
mtspr SPRN_PSSCR, r6
mtspr SPRN_PID, r7
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
BEGIN_FTR_SECTION
PPC_INVALIDATE_ERAT
END_FTR_SECTION_IFSET(CPU_FTR_POWER9_DD1)
/*
* POWER7/POWER8 guest -> host partition switch code.
@ -1663,6 +1736,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
isync
/* load host SLB entries */
BEGIN_MMU_FTR_SECTION
b 0f
END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_RADIX)
ld r8,PACA_SLBSHADOWPTR(r13)
.rept SLB_NUM_BOLTED
@ -1675,7 +1751,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
slbmte r6,r5
1: addi r8,r8,16
.endr
0:
#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
/* Finish timing, if we have a vcpu */
ld r4, HSTATE_KVM_VCPU(r13)
@ -1702,11 +1778,19 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
* reflect the HDSI to the guest as a DSI.
*/
kvmppc_hdsi:
ld r3, VCPU_KVM(r9)
lbz r0, KVM_RADIX(r3)
cmpwi r0, 0
mfspr r4, SPRN_HDAR
mfspr r6, SPRN_HDSISR
bne .Lradix_hdsi /* on radix, just save DAR/DSISR/ASDR */
/* HPTE not found fault or protection fault? */
andis. r0, r6, (DSISR_NOHPTE | DSISR_PROTFAULT)@h
beq 1f /* if not, send it to the guest */
BEGIN_FTR_SECTION
mfspr r5, SPRN_ASDR /* on POWER9, use ASDR to get VSID */
b 4f
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
andi. r0, r11, MSR_DR /* data relocation enabled? */
beq 3f
clrrdi r0, r4, 28
@ -1776,13 +1860,29 @@ fast_interrupt_c_return:
stb r0, HSTATE_IN_GUEST(r13)
b guest_exit_cont
.Lradix_hdsi:
std r4, VCPU_FAULT_DAR(r9)
stw r6, VCPU_FAULT_DSISR(r9)
.Lradix_hisi:
mfspr r5, SPRN_ASDR
std r5, VCPU_FAULT_GPA(r9)
b guest_exit_cont
/*
* Similarly for an HISI, reflect it to the guest as an ISI unless
* it is an HPTE not found fault for a page that we have paged out.
*/
kvmppc_hisi:
ld r3, VCPU_KVM(r9)
lbz r0, KVM_RADIX(r3)
cmpwi r0, 0
bne .Lradix_hisi /* for radix, just save ASDR */
andis. r0, r11, SRR1_ISI_NOPT@h
beq 1f
BEGIN_FTR_SECTION
mfspr r5, SPRN_ASDR /* on POWER9, use ASDR to get VSID */
b 4f
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
andi. r0, r11, MSR_IR /* instruction relocation enabled? */
beq 3f
clrrdi r0, r10, 28

32
arch/powerpc/kvm/book3s_segment.S
View File

@ -167,20 +167,38 @@ kvmppc_handler_trampoline_enter_end:
* *
*****************************************************************************/
.global kvmppc_handler_trampoline_exit
kvmppc_handler_trampoline_exit:
.global kvmppc_interrupt_pr
kvmppc_interrupt_pr:
/* 64-bit entry. Register usage at this point:
*
* SPRG_SCRATCH0 = guest R13
* R12 = (guest CR << 32) | exit handler id
* R13 = PACA
* HSTATE.SCRATCH0 = guest R12
* HSTATE.SCRATCH1 = guest CTR if RELOCATABLE
*/
#ifdef CONFIG_PPC64
/* Match 32-bit entry */
#ifdef CONFIG_RELOCATABLE
std r9, HSTATE_SCRATCH2(r13)
ld r9, HSTATE_SCRATCH1(r13)
mtctr r9
ld r9, HSTATE_SCRATCH2(r13)
#endif
rotldi r12, r12, 32 /* Flip R12 halves for stw */
stw r12, HSTATE_SCRATCH1(r13) /* CR is now in the low half */
srdi r12, r12, 32 /* shift trap into low half */
#endif
.global kvmppc_handler_trampoline_exit
kvmppc_handler_trampoline_exit:
/* Register usage at this point:
*
* SPRG_SCRATCH0 = guest R13
* R12 = exit handler id
* R13 = shadow vcpu (32-bit) or PACA (64-bit)
* SPRG_SCRATCH0 = guest R13
* R12 = exit handler id
* R13 = shadow vcpu (32-bit) or PACA (64-bit)
* HSTATE.SCRATCH0 = guest R12
* HSTATE.SCRATCH1 = guest CR
*
*/
/* Save registers */

32
arch/powerpc/kvm/powerpc.c
View File

@ -565,6 +565,13 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_PPC_HWRNG:
r = kvmppc_hwrng_present();
break;
case KVM_CAP_PPC_MMU_RADIX:
r = !!(hv_enabled && radix_enabled());
break;
case KVM_CAP_PPC_MMU_HASH_V3:
r = !!(hv_enabled && !radix_enabled() &&
cpu_has_feature(CPU_FTR_ARCH_300));
break;
#endif
case KVM_CAP_SYNC_MMU:
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
@ -1468,6 +1475,31 @@ long kvm_arch_vm_ioctl(struct file *filp,
r = kvm_vm_ioctl_rtas_define_token(kvm, argp);
break;
}
case KVM_PPC_CONFIGURE_V3_MMU: {
struct kvm *kvm = filp->private_data;
struct kvm_ppc_mmuv3_cfg cfg;
r = -EINVAL;
if (!kvm->arch.kvm_ops->configure_mmu)
goto out;
r = -EFAULT;
if (copy_from_user(&cfg, argp, sizeof(cfg)))
goto out;
r = kvm->arch.kvm_ops->configure_mmu(kvm, &cfg);
break;
}
case KVM_PPC_GET_RMMU_INFO: {
struct kvm *kvm = filp->private_data;
struct kvm_ppc_rmmu_info info;
r = -EINVAL;
if (!kvm->arch.kvm_ops->get_rmmu_info)
goto out;
r = kvm->arch.kvm_ops->get_rmmu_info(kvm, &info);
if (r >= 0 && copy_to_user(argp, &info, sizeof(info)))
r = -EFAULT;
break;
}
default: {
struct kvm *kvm = filp->private_data;
r = kvm->arch.kvm_ops->arch_vm_ioctl(filp, ioctl, arg);

3
arch/powerpc/mm/init-common.c
View File

@ -41,6 +41,7 @@ static void pmd_ctor(void *addr)
}
struct kmem_cache *pgtable_cache[MAX_PGTABLE_INDEX_SIZE];
EXPORT_SYMBOL_GPL(pgtable_cache); /* used by kvm_hv module */
/*
* Create a kmem_cache() for pagetables. This is not used for PTE
@ -82,7 +83,7 @@ void pgtable_cache_add(unsigned shift, void (*ctor)(void *))
pgtable_cache[shift - 1] = new;
pr_debug("Allocated pgtable cache for order %d\n", shift);
}
EXPORT_SYMBOL_GPL(pgtable_cache_add); /* used by kvm_hv module */
void pgtable_cache_init(void)
{

35
arch/powerpc/mm/init_64.c
View File

@ -42,6 +42,8 @@
#include <linux/memblock.h>
#include <linux/hugetlb.h>
#include <linux/slab.h>
#include <linux/of_fdt.h>
#include <linux/libfdt.h>
#include <asm/pgalloc.h>
#include <asm/page.h>
@ -344,12 +346,45 @@ static int __init parse_disable_radix(char *p)
}
early_param("disable_radix", parse_disable_radix);
/*
* If we're running under a hypervisor, we need to check the contents of
* /chosen/ibm,architecture-vec-5 to see if the hypervisor is willing to do
* radix. If not, we clear the radix feature bit so we fall back to hash.
*/
static void early_check_vec5(void)
{
unsigned long root, chosen;
int size;
const u8 *vec5;
root = of_get_flat_dt_root();
chosen = of_get_flat_dt_subnode_by_name(root, "chosen");
if (chosen == -FDT_ERR_NOTFOUND)
return;
vec5 = of_get_flat_dt_prop(chosen, "ibm,architecture-vec-5", &size);
if (!vec5)
return;
if (size <= OV5_INDX(OV5_MMU_RADIX_300) ||
!(vec5[OV5_INDX(OV5_MMU_RADIX_300)] & OV5_FEAT(OV5_MMU_RADIX_300)))
/* Hypervisor doesn't support radix */
cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX;
}
void __init mmu_early_init_devtree(void)
{
/* Disable radix mode based on kernel command line. */
if (disable_radix)
cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX;
/*
* Check /chosen/ibm,architecture-vec-5 if running as a guest.
* When running bare-metal, we can use radix if we like
* even though the ibm,architecture-vec-5 property created by
* skiboot doesn't have the necessary bits set.
*/
if (early_radix_enabled() && !(mfmsr() & MSR_HV))
early_check_vec5();
if (early_radix_enabled())
radix__early_init_devtree();
else

2
arch/powerpc/mm/pgtable-radix.c
View File

@ -401,6 +401,8 @@ void __init radix__early_init_mmu(void)
mtspr(SPRN_LPCR, lpcr | LPCR_UPRT | LPCR_HR);
radix_init_partition_table();
radix_init_amor();
} else {
radix_init_pseries();
}
memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE);

16
arch/powerpc/mm/pgtable_64.c
View File

@ -454,13 +454,23 @@ void __init mmu_partition_table_init(void)
void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0,
unsigned long dw1)
{
unsigned long old = be64_to_cpu(partition_tb[lpid].patb0);
partition_tb[lpid].patb0 = cpu_to_be64(dw0);
partition_tb[lpid].patb1 = cpu_to_be64(dw1);
/* Global flush of TLBs and partition table caches for this lpid */
/*
* Global flush of TLBs and partition table caches for this lpid.
* The type of flush (hash or radix) depends on what the previous
* use of this partition ID was, not the new use.
*/
asm volatile("ptesync" : : : "memory");
asm volatile(PPC_TLBIE_5(%0,%1,2,0,0) : :
"r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
if (old & PATB_HR)
asm volatile(PPC_TLBIE_5(%0,%1,2,0,1) : :
"r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
else
asm volatile(PPC_TLBIE_5(%0,%1,2,0,0) : :
"r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
asm volatile("eieio; tlbsync; ptesync" : : : "memory");
}
EXPORT_SYMBOL_GPL(mmu_partition_table_set_entry);

2
arch/powerpc/platforms/pseries/firmware.c
View File

@ -126,7 +126,7 @@ static void __init fw_vec5_feature_init(const char *vec5, unsigned long len)
index = OV5_INDX(vec5_fw_features_table[i].feature);
feat = OV5_FEAT(vec5_fw_features_table[i].feature);
if (vec5[index] & feat)
if (index < len && (vec5[index] & feat))
powerpc_firmware_features |=
vec5_fw_features_table[i].val;
}

29
arch/powerpc/platforms/pseries/lpar.c
View File

@ -609,6 +609,29 @@ static int __init disable_bulk_remove(char *str)
__setup("bulk_remove=", disable_bulk_remove);
/* Actually only used for radix, so far */
static int pseries_lpar_register_process_table(unsigned long base,
unsigned long page_size, unsigned long table_size)
{
long rc;
unsigned long flags = PROC_TABLE_NEW;
if (radix_enabled())
flags |= PROC_TABLE_RADIX | PROC_TABLE_GTSE;
for (;;) {
rc = plpar_hcall_norets(H_REGISTER_PROC_TBL, flags, base,
page_size, table_size);
if (!H_IS_LONG_BUSY(rc))
break;
mdelay(get_longbusy_msecs(rc));
}
if (rc != H_SUCCESS) {
pr_err("Failed to register process table (rc=%ld)\n", rc);
BUG();
}
return rc;
}
void __init hpte_init_pseries(void)
{
mmu_hash_ops.hpte_invalidate = pSeries_lpar_hpte_invalidate;
@ -622,6 +645,12 @@ void __init hpte_init_pseries(void)
mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;
}
void radix_init_pseries(void)
{
pr_info("Using radix MMU under hypervisor\n");
register_process_table = pseries_lpar_register_process_table;
}
#ifdef CONFIG_PPC_SMLPAR
#define CMO_FREE_HINT_DEFAULT 1
static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;

6
include/uapi/linux/kvm.h
View File

@ -871,6 +871,8 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_S390_USER_INSTR0 130
#define KVM_CAP_MSI_DEVID 131
#define KVM_CAP_PPC_HTM 132
#define KVM_CAP_PPC_MMU_RADIX 134
#define KVM_CAP_PPC_MMU_HASH_V3 135
#ifdef KVM_CAP_IRQ_ROUTING
@ -1187,6 +1189,10 @@ struct kvm_s390_ucas_mapping {
#define KVM_ARM_SET_DEVICE_ADDR _IOW(KVMIO, 0xab, struct kvm_arm_device_addr)
/* Available with KVM_CAP_PPC_RTAS */
#define KVM_PPC_RTAS_DEFINE_TOKEN _IOW(KVMIO, 0xac, struct kvm_rtas_token_args)
/* Available with KVM_CAP_PPC_RADIX_MMU or KVM_CAP_PPC_HASH_MMU_V3 */
#define KVM_PPC_CONFIGURE_V3_MMU _IOW(KVMIO, 0xaf, struct kvm_ppc_mmuv3_cfg)
/* Available with KVM_CAP_PPC_RADIX_MMU */
#define KVM_PPC_GET_RMMU_INFO _IOW(KVMIO, 0xb0, struct kvm_ppc_rmmu_info)
/* ioctl for vm fd */
#define KVM_CREATE_DEVICE _IOWR(KVMIO, 0xe0, struct kvm_create_device)