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powerpc/64s/exception: Move KVM test to common code

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This allows more code to be moved out of unrelocated regions. The
system call KVMTEST is changed to be open-coded and remain in the
tramp area to avoid having to move it to entry_64.S. The custom nature
of the system call entry code means the hcall case can be made more
streamlined than regular interrupt handlers.

mpe: Incorporate fix from Nick:

Moving KVM test to the common entry code missed the case of HMI and
MCE, which do not do __GEN_COMMON_ENTRY (because they don't want to
switch to virt mode).

This means a MCE or HMI exception that is taken while KVM is running a
guest context will not be switched out of that context, and KVM won't
be notified. Found by running sigfuz in guest with patched host on
POWER9 DD2.3, which causes some TM related HMI interrupts (which are
expected and supposed to be handled by KVM).

This fix adds a __GEN_REALMODE_COMMON_ENTRY for those handlers to add
the KVM test. This makes them look a little more like other handlers
that all use __GEN_COMMON_ENTRY.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200225173541.1549955-13-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2020-02-26 03:35:21 +10:00 committed by Michael Ellerman
parent 0eddf327e1
commit 9600f261ac
3 changed files with 139 additions and 139 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

260
arch/powerpc/kernel/exceptions-64s.S
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@ -44,7 +44,6 @@
* EXC_VIRT_BEGIN/END - virt (AIL), unrelocated exception vectors
* TRAMP_REAL_BEGIN - real, unrelocated helpers (virt may call these)
* TRAMP_VIRT_BEGIN - virt, unreloc helpers (in practice, real can use)
* TRAMP_KVM_BEGIN - KVM handlers, these are put into real, unrelocated
* EXC_COMMON - After switching to virtual, relocated mode.
*/
@ -74,13 +73,6 @@ name:
#define TRAMP_VIRT_BEGIN(name) \
FIXED_SECTION_ENTRY_BEGIN(virt_trampolines, name)
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
#define TRAMP_KVM_BEGIN(name) \
TRAMP_VIRT_BEGIN(name)
#else
#define TRAMP_KVM_BEGIN(name)
#endif
#define EXC_REAL_NONE(start, size) \
FIXED_SECTION_ENTRY_BEGIN_LOCATION(real_vectors, exc_real_##start##_##unused, start, size); \
FIXED_SECTION_ENTRY_END_LOCATION(real_vectors, exc_real_##start##_##unused, start, size)
@ -271,6 +263,9 @@ do_define_int n
.endm
.macro GEN_KVM name
.balign IFETCH_ALIGN_BYTES
\name\()_kvm:
.if IKVM_SKIP
cmpwi r10,KVM_GUEST_MODE_SKIP
beq 89f
@ -281,13 +276,18 @@ BEGIN_FTR_SECTION_NESTED(947)
END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947)
.endif
ld r10,PACA_EXGEN+EX_CTR(r13)
mtctr r10
BEGIN_FTR_SECTION_NESTED(948)
ld r10,IAREA+EX_PPR(r13)
std r10,HSTATE_PPR(r13)
END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
ld r10,IAREA+EX_R10(r13)
ld r11,IAREA+EX_R11(r13)
ld r12,IAREA+EX_R12(r13)
std r12,HSTATE_SCRATCH0(r13)
sldi r12,r9,32
ld r9,IAREA+EX_R9(r13)
ld r10,IAREA+EX_R10(r13)
/* HSRR variants have the 0x2 bit added to their trap number */
.if IHSRR == EXC_HV_OR_STD
BEGIN_FTR_SECTION
@ -300,29 +300,16 @@ END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
.else
ori r12,r12,(IVEC)
.endif
#ifdef CONFIG_RELOCATABLE
/*
* KVM requires __LOAD_FAR_HANDLER beause kvmppc_interrupt lives
* outside the head section. CONFIG_RELOCATABLE KVM expects CTR
* to be saved in HSTATE_SCRATCH1.
*/
ld r9,IAREA+EX_CTR(r13)
std r9,HSTATE_SCRATCH1(r13)
__LOAD_FAR_HANDLER(r9, kvmppc_interrupt)
mtctr r9
ld r9,IAREA+EX_R9(r13)
bctr
#else
ld r9,IAREA+EX_R9(r13)
b kvmppc_interrupt
#endif
.if IKVM_SKIP
89: mtocrf 0x80,r9
ld r10,PACA_EXGEN+EX_CTR(r13)
mtctr r10
ld r9,IAREA+EX_R9(r13)
ld r10,IAREA+EX_R10(r13)
ld r11,IAREA+EX_R11(r13)
ld r12,IAREA+EX_R12(r13)
.if IHSRR == EXC_HV_OR_STD
BEGIN_FTR_SECTION
b kvmppc_skip_Hinterrupt
@ -407,11 +394,6 @@ END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
mfctr r10
std r10,IAREA+EX_CTR(r13)
mfcr r9
.if (!\virt && IKVM_REAL) || (\virt && IKVM_VIRT)
KVMTEST \name IHSRR IVEC
.endif
std r11,IAREA+EX_R11(r13)
std r12,IAREA+EX_R12(r13)
@ -469,12 +451,18 @@ END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
/*
* __GEN_COMMON_ENTRY is required to receive the branch from interrupt
* entry, except in the case of the IEARLY handlers.
* entry, except in the case of the real-mode handlers which require
* __GEN_REALMODE_COMMON_ENTRY.
*
* This switches to virtual mode and sets MSR[RI].
*/
.macro __GEN_COMMON_ENTRY name
DEFINE_FIXED_SYMBOL(\name\()_common_real)
\name\()_common_real:
.if IKVM_REAL
KVMTEST \name IHSRR IVEC
.endif
ld r10,PACAKMSR(r13) /* get MSR value for kernel */
/* MSR[RI] is clear iff using SRR regs */
.if IHSRR == EXC_HV_OR_STD
@ -487,12 +475,32 @@ DEFINE_FIXED_SYMBOL(\name\()_common_real)
mtmsrd r10
.if IVIRT
.if IKVM_VIRT
b 1f /* skip the virt test coming from real */
.endif
.balign IFETCH_ALIGN_BYTES
DEFINE_FIXED_SYMBOL(\name\()_common_virt)
\name\()_common_virt:
.if IKVM_VIRT
KVMTEST \name IHSRR IVEC
1:
.endif
.endif /* IVIRT */
.endm
/*
* Don't switch to virt mode. Used for early MCE and HMI handlers that
* want to run in real mode.
*/
.macro __GEN_REALMODE_COMMON_ENTRY name
DEFINE_FIXED_SYMBOL(\name\()_common_real)
\name\()_common_real:
.if IKVM_REAL
KVMTEST \name IHSRR IVEC
.endif
.endm
.macro __GEN_COMMON_BODY name
.if IMASK
lbz r10,PACAIRQSOFTMASK(r13)
@ -848,8 +856,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
*/
EXC_REAL_END(system_reset, 0x100, 0x100)
EXC_VIRT_NONE(0x4100, 0x100)
TRAMP_KVM_BEGIN(system_reset_kvm)
GEN_KVM system_reset
#ifdef CONFIG_PPC_P7_NAP
TRAMP_REAL_BEGIN(system_reset_idle_wake)
@ -927,6 +933,8 @@ EXC_COMMON_BEGIN(system_reset_common)
EXCEPTION_RESTORE_REGS EXC_STD
RFI_TO_USER_OR_KERNEL
GEN_KVM system_reset
INT_DEFINE_BEGIN(machine_check_early)
IVEC=0x200
@ -968,9 +976,6 @@ TRAMP_REAL_BEGIN(machine_check_fwnmi)
GEN_INT_ENTRY machine_check_early, virt=0
#endif
TRAMP_KVM_BEGIN(machine_check_kvm)
GEN_KVM machine_check
#define MACHINE_CHECK_HANDLER_WINDUP \
/* Clear MSR_RI before setting SRR0 and SRR1. */\
li r9,0; \
@ -985,6 +990,8 @@ EXC_COMMON_BEGIN(machine_check_early_common)
mfspr r11,SPRN_SRR0
mfspr r12,SPRN_SRR1
__GEN_REALMODE_COMMON_ENTRY machine_check_early
/*
* Switch to mc_emergency stack and handle re-entrancy (we limit
* the nested MCE upto level 4 to avoid stack overflow).
@ -1126,6 +1133,9 @@ EXC_COMMON_BEGIN(machine_check_common)
bl machine_check_exception
b ret_from_except
GEN_KVM machine_check
#ifdef CONFIG_PPC_P7_NAP
/*
* This is an idle wakeup. Low level machine check has already been
@ -1218,8 +1228,6 @@ EXC_REAL_END(data_access, 0x300, 0x80)
EXC_VIRT_BEGIN(data_access, 0x4300, 0x80)
GEN_INT_ENTRY data_access, virt=1
EXC_VIRT_END(data_access, 0x4300, 0x80)
TRAMP_KVM_BEGIN(data_access_kvm)
GEN_KVM data_access
EXC_COMMON_BEGIN(data_access_common)
GEN_COMMON data_access
ld r4,_DAR(r1)
@ -1232,6 +1240,8 @@ MMU_FTR_SECTION_ELSE
b handle_page_fault
ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
GEN_KVM data_access
INT_DEFINE_BEGIN(data_access_slb)
IVEC=0x380
@ -1248,8 +1258,6 @@ EXC_REAL_END(data_access_slb, 0x380, 0x80)
EXC_VIRT_BEGIN(data_access_slb, 0x4380, 0x80)
GEN_INT_ENTRY data_access_slb, virt=1
EXC_VIRT_END(data_access_slb, 0x4380, 0x80)
TRAMP_KVM_BEGIN(data_access_slb_kvm)
GEN_KVM data_access_slb
EXC_COMMON_BEGIN(data_access_slb_common)
GEN_COMMON data_access_slb
ld r4,_DAR(r1)
@ -1274,6 +1282,8 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
bl do_bad_slb_fault
b ret_from_except
GEN_KVM data_access_slb
INT_DEFINE_BEGIN(instruction_access)
IVEC=0x400
@ -1289,8 +1299,6 @@ EXC_REAL_END(instruction_access, 0x400, 0x80)
EXC_VIRT_BEGIN(instruction_access, 0x4400, 0x80)
GEN_INT_ENTRY instruction_access, virt=1
EXC_VIRT_END(instruction_access, 0x4400, 0x80)
TRAMP_KVM_BEGIN(instruction_access_kvm)
GEN_KVM instruction_access
EXC_COMMON_BEGIN(instruction_access_common)
GEN_COMMON instruction_access
ld r4,_DAR(r1)
@ -1303,6 +1311,8 @@ MMU_FTR_SECTION_ELSE
b handle_page_fault
ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
GEN_KVM instruction_access
INT_DEFINE_BEGIN(instruction_access_slb)
IVEC=0x480
@ -1319,8 +1329,6 @@ EXC_REAL_END(instruction_access_slb, 0x480, 0x80)
EXC_VIRT_BEGIN(instruction_access_slb, 0x4480, 0x80)
GEN_INT_ENTRY instruction_access_slb, virt=1
EXC_VIRT_END(instruction_access_slb, 0x4480, 0x80)
TRAMP_KVM_BEGIN(instruction_access_slb_kvm)
GEN_KVM instruction_access_slb
EXC_COMMON_BEGIN(instruction_access_slb_common)
GEN_COMMON instruction_access_slb
ld r4,_DAR(r1)
@ -1345,6 +1353,9 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
bl do_bad_slb_fault
b ret_from_except
GEN_KVM instruction_access_slb
INT_DEFINE_BEGIN(hardware_interrupt)
IVEC=0x500
IHSRR=EXC_HV_OR_STD
@ -1359,8 +1370,6 @@ EXC_REAL_END(hardware_interrupt, 0x500, 0x100)
EXC_VIRT_BEGIN(hardware_interrupt, 0x4500, 0x100)
GEN_INT_ENTRY hardware_interrupt, virt=1
EXC_VIRT_END(hardware_interrupt, 0x4500, 0x100)
TRAMP_KVM_BEGIN(hardware_interrupt_kvm)
GEN_KVM hardware_interrupt
EXC_COMMON_BEGIN(hardware_interrupt_common)
GEN_COMMON hardware_interrupt
FINISH_NAP
@ -1369,6 +1378,8 @@ EXC_COMMON_BEGIN(hardware_interrupt_common)
bl do_IRQ
b ret_from_except_lite
GEN_KVM hardware_interrupt
INT_DEFINE_BEGIN(alignment)
IVEC=0x600
@ -1383,8 +1394,6 @@ EXC_REAL_END(alignment, 0x600, 0x100)
EXC_VIRT_BEGIN(alignment, 0x4600, 0x100)
GEN_INT_ENTRY alignment, virt=1
EXC_VIRT_END(alignment, 0x4600, 0x100)
TRAMP_KVM_BEGIN(alignment_kvm)
GEN_KVM alignment
EXC_COMMON_BEGIN(alignment_common)
GEN_COMMON alignment
bl save_nvgprs
@ -1392,6 +1401,8 @@ EXC_COMMON_BEGIN(alignment_common)
bl alignment_exception
b ret_from_except
GEN_KVM alignment
INT_DEFINE_BEGIN(program_check)
IVEC=0x700
@ -1404,8 +1415,6 @@ EXC_REAL_END(program_check, 0x700, 0x100)
EXC_VIRT_BEGIN(program_check, 0x4700, 0x100)
GEN_INT_ENTRY program_check, virt=1
EXC_VIRT_END(program_check, 0x4700, 0x100)
TRAMP_KVM_BEGIN(program_check_kvm)
GEN_KVM program_check
EXC_COMMON_BEGIN(program_check_common)
__GEN_COMMON_ENTRY program_check
@ -1445,6 +1454,8 @@ EXC_COMMON_BEGIN(program_check_common)
bl program_check_exception
b ret_from_except
GEN_KVM program_check
INT_DEFINE_BEGIN(fp_unavailable)
IVEC=0x800
@ -1458,8 +1469,6 @@ EXC_REAL_END(fp_unavailable, 0x800, 0x100)
EXC_VIRT_BEGIN(fp_unavailable, 0x4800, 0x100)
GEN_INT_ENTRY fp_unavailable, virt=1
EXC_VIRT_END(fp_unavailable, 0x4800, 0x100)
TRAMP_KVM_BEGIN(fp_unavailable_kvm)
GEN_KVM fp_unavailable
EXC_COMMON_BEGIN(fp_unavailable_common)
GEN_COMMON fp_unavailable
bne 1f /* if from user, just load it up */
@ -1490,6 +1499,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_TM)
b ret_from_except
#endif
GEN_KVM fp_unavailable
INT_DEFINE_BEGIN(decrementer)
IVEC=0x900
@ -1503,8 +1514,6 @@ EXC_REAL_END(decrementer, 0x900, 0x80)
EXC_VIRT_BEGIN(decrementer, 0x4900, 0x80)
GEN_INT_ENTRY decrementer, virt=1
EXC_VIRT_END(decrementer, 0x4900, 0x80)
TRAMP_KVM_BEGIN(decrementer_kvm)
GEN_KVM decrementer
EXC_COMMON_BEGIN(decrementer_common)
GEN_COMMON decrementer
FINISH_NAP
@ -1513,6 +1522,8 @@ EXC_COMMON_BEGIN(decrementer_common)
bl timer_interrupt
b ret_from_except_lite
GEN_KVM decrementer
INT_DEFINE_BEGIN(hdecrementer)
IVEC=0x980
@ -1527,8 +1538,6 @@ EXC_REAL_END(hdecrementer, 0x980, 0x80)
EXC_VIRT_BEGIN(hdecrementer, 0x4980, 0x80)
GEN_INT_ENTRY hdecrementer, virt=1
EXC_VIRT_END(hdecrementer, 0x4980, 0x80)
TRAMP_KVM_BEGIN(hdecrementer_kvm)
GEN_KVM hdecrementer
EXC_COMMON_BEGIN(hdecrementer_common)
GEN_COMMON hdecrementer
bl save_nvgprs
@ -1536,6 +1545,8 @@ EXC_COMMON_BEGIN(hdecrementer_common)
bl hdec_interrupt
b ret_from_except
GEN_KVM hdecrementer
INT_DEFINE_BEGIN(doorbell_super)
IVEC=0xa00
@ -1549,8 +1560,6 @@ EXC_REAL_END(doorbell_super, 0xa00, 0x100)
EXC_VIRT_BEGIN(doorbell_super, 0x4a00, 0x100)
GEN_INT_ENTRY doorbell_super, virt=1
EXC_VIRT_END(doorbell_super, 0x4a00, 0x100)
TRAMP_KVM_BEGIN(doorbell_super_kvm)
GEN_KVM doorbell_super
EXC_COMMON_BEGIN(doorbell_super_common)
GEN_COMMON doorbell_super
FINISH_NAP
@ -1563,6 +1572,8 @@ EXC_COMMON_BEGIN(doorbell_super_common)
#endif
b ret_from_except_lite
GEN_KVM doorbell_super
EXC_REAL_NONE(0xb00, 0x100)
EXC_VIRT_NONE(0x4b00, 0x100)
@ -1667,6 +1678,7 @@ EXC_VIRT_BEGIN(system_call, 0x4c00, 0x100)
EXC_VIRT_END(system_call, 0x4c00, 0x100)
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
TRAMP_REAL_BEGIN(system_call_kvm)
/*
* This is a hcall, so register convention is as above, with these
* differences:
@ -1674,20 +1686,35 @@ EXC_VIRT_END(system_call, 0x4c00, 0x100)
* ctr = orig r13
* orig r10 saved in PACA
*/
TRAMP_KVM_BEGIN(system_call_kvm)
/*
* 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).
*/
OPT_GET_SPR(r10, SPRN_PPR, CPU_FTR_HAS_PPR)
BEGIN_FTR_SECTION_NESTED(948)
mfspr r10,SPRN_PPR
std r10,HSTATE_PPR(r13)
END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
HMT_MEDIUM
OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r10, CPU_FTR_HAS_PPR)
mfctr r10
SET_SCRATCH0(r10)
std r9,PACA_EXGEN+EX_R9(r13)
mfcr r9
GEN_KVM system_call
mfcr r10
std r12,HSTATE_SCRATCH0(r13)
sldi r12,r10,32
ori r12,r12,0xc00
#ifdef CONFIG_RELOCATABLE
/*
* Requires __LOAD_FAR_HANDLER beause kvmppc_interrupt lives
* outside the head section.
*/
__LOAD_FAR_HANDLER(r10, kvmppc_interrupt)
mtctr r10
ld r10,PACA_EXGEN+EX_R10(r13)
bctr
#else
ld r10,PACA_EXGEN+EX_R10(r13)
b kvmppc_interrupt
#endif
#endif
@ -1702,8 +1729,6 @@ EXC_REAL_END(single_step, 0xd00, 0x100)
EXC_VIRT_BEGIN(single_step, 0x4d00, 0x100)
GEN_INT_ENTRY single_step, virt=1
EXC_VIRT_END(single_step, 0x4d00, 0x100)
TRAMP_KVM_BEGIN(single_step_kvm)
GEN_KVM single_step
EXC_COMMON_BEGIN(single_step_common)
GEN_COMMON single_step
bl save_nvgprs
@ -1711,6 +1736,8 @@ EXC_COMMON_BEGIN(single_step_common)
bl single_step_exception
b ret_from_except
GEN_KVM single_step
INT_DEFINE_BEGIN(h_data_storage)
IVEC=0xe00
@ -1728,8 +1755,6 @@ EXC_REAL_END(h_data_storage, 0xe00, 0x20)
EXC_VIRT_BEGIN(h_data_storage, 0x4e00, 0x20)
GEN_INT_ENTRY h_data_storage, virt=1, ool=1
EXC_VIRT_END(h_data_storage, 0x4e00, 0x20)
TRAMP_KVM_BEGIN(h_data_storage_kvm)
GEN_KVM h_data_storage
EXC_COMMON_BEGIN(h_data_storage_common)
GEN_COMMON h_data_storage
bl save_nvgprs
@ -1743,6 +1768,8 @@ MMU_FTR_SECTION_ELSE
ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_TYPE_RADIX)
b ret_from_except
GEN_KVM h_data_storage
INT_DEFINE_BEGIN(h_instr_storage)
IVEC=0xe20
@ -1757,8 +1784,6 @@ EXC_REAL_END(h_instr_storage, 0xe20, 0x20)
EXC_VIRT_BEGIN(h_instr_storage, 0x4e20, 0x20)
GEN_INT_ENTRY h_instr_storage, virt=1, ool=1
EXC_VIRT_END(h_instr_storage, 0x4e20, 0x20)
TRAMP_KVM_BEGIN(h_instr_storage_kvm)
GEN_KVM h_instr_storage
EXC_COMMON_BEGIN(h_instr_storage_common)
GEN_COMMON h_instr_storage
bl save_nvgprs
@ -1766,6 +1791,8 @@ EXC_COMMON_BEGIN(h_instr_storage_common)
bl unknown_exception
b ret_from_except
GEN_KVM h_instr_storage
INT_DEFINE_BEGIN(emulation_assist)
IVEC=0xe40
@ -1780,8 +1807,6 @@ EXC_REAL_END(emulation_assist, 0xe40, 0x20)
EXC_VIRT_BEGIN(emulation_assist, 0x4e40, 0x20)
GEN_INT_ENTRY emulation_assist, virt=1, ool=1
EXC_VIRT_END(emulation_assist, 0x4e40, 0x20)
TRAMP_KVM_BEGIN(emulation_assist_kvm)
GEN_KVM emulation_assist
EXC_COMMON_BEGIN(emulation_assist_common)
GEN_COMMON emulation_assist
bl save_nvgprs
@ -1789,6 +1814,8 @@ EXC_COMMON_BEGIN(emulation_assist_common)
bl emulation_assist_interrupt
b ret_from_except
GEN_KVM emulation_assist
/*
* hmi_exception trampoline is a special case. It jumps to hmi_exception_early
@ -1816,14 +1843,13 @@ EXC_REAL_BEGIN(hmi_exception, 0xe60, 0x20)
GEN_INT_ENTRY hmi_exception_early, virt=0, ool=1
EXC_REAL_END(hmi_exception, 0xe60, 0x20)
EXC_VIRT_NONE(0x4e60, 0x20)
TRAMP_KVM_BEGIN(hmi_exception_early_kvm)
GEN_KVM hmi_exception_early
TRAMP_KVM_BEGIN(hmi_exception_kvm)
GEN_KVM hmi_exception
EXC_COMMON_BEGIN(hmi_exception_early_common)
mfspr r11,SPRN_HSRR0 /* Save HSRR0 */
mfspr r12,SPRN_HSRR1 /* Save HSRR1 */
__GEN_REALMODE_COMMON_ENTRY hmi_exception_early
mr r10,r1 /* Save r1 */
ld r1,PACAEMERGSP(r13) /* Use emergency stack for realmode */
subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
@ -1846,6 +1872,8 @@ EXC_COMMON_BEGIN(hmi_exception_early_common)
EXCEPTION_RESTORE_REGS EXC_HV
GEN_INT_ENTRY hmi_exception, virt=0
GEN_KVM hmi_exception_early
EXC_COMMON_BEGIN(hmi_exception_common)
GEN_COMMON hmi_exception
FINISH_NAP
@ -1855,6 +1883,8 @@ EXC_COMMON_BEGIN(hmi_exception_common)
bl handle_hmi_exception
b ret_from_except
GEN_KVM hmi_exception
INT_DEFINE_BEGIN(h_doorbell)
IVEC=0xe80
@ -1870,8 +1900,6 @@ EXC_REAL_END(h_doorbell, 0xe80, 0x20)
EXC_VIRT_BEGIN(h_doorbell, 0x4e80, 0x20)
GEN_INT_ENTRY h_doorbell, virt=1, ool=1
EXC_VIRT_END(h_doorbell, 0x4e80, 0x20)
TRAMP_KVM_BEGIN(h_doorbell_kvm)
GEN_KVM h_doorbell
EXC_COMMON_BEGIN(h_doorbell_common)
GEN_COMMON h_doorbell
FINISH_NAP
@ -1884,6 +1912,8 @@ EXC_COMMON_BEGIN(h_doorbell_common)
#endif
b ret_from_except_lite
GEN_KVM h_doorbell
INT_DEFINE_BEGIN(h_virt_irq)
IVEC=0xea0
@ -1899,8 +1929,6 @@ EXC_REAL_END(h_virt_irq, 0xea0, 0x20)
EXC_VIRT_BEGIN(h_virt_irq, 0x4ea0, 0x20)
GEN_INT_ENTRY h_virt_irq, virt=1, ool=1
EXC_VIRT_END(h_virt_irq, 0x4ea0, 0x20)
TRAMP_KVM_BEGIN(h_virt_irq_kvm)
GEN_KVM h_virt_irq
EXC_COMMON_BEGIN(h_virt_irq_common)
GEN_COMMON h_virt_irq
FINISH_NAP
@ -1909,6 +1937,8 @@ EXC_COMMON_BEGIN(h_virt_irq_common)
bl do_IRQ
b ret_from_except_lite
GEN_KVM h_virt_irq
EXC_REAL_NONE(0xec0, 0x20)
EXC_VIRT_NONE(0x4ec0, 0x20)
@ -1928,8 +1958,6 @@ EXC_REAL_END(performance_monitor, 0xf00, 0x20)
EXC_VIRT_BEGIN(performance_monitor, 0x4f00, 0x20)
GEN_INT_ENTRY performance_monitor, virt=1, ool=1
EXC_VIRT_END(performance_monitor, 0x4f00, 0x20)
TRAMP_KVM_BEGIN(performance_monitor_kvm)
GEN_KVM performance_monitor
EXC_COMMON_BEGIN(performance_monitor_common)
GEN_COMMON performance_monitor
FINISH_NAP
@ -1938,6 +1966,8 @@ EXC_COMMON_BEGIN(performance_monitor_common)
bl performance_monitor_exception
b ret_from_except_lite
GEN_KVM performance_monitor
INT_DEFINE_BEGIN(altivec_unavailable)
IVEC=0xf20
@ -1951,8 +1981,6 @@ EXC_REAL_END(altivec_unavailable, 0xf20, 0x20)
EXC_VIRT_BEGIN(altivec_unavailable, 0x4f20, 0x20)
GEN_INT_ENTRY altivec_unavailable, virt=1, ool=1
EXC_VIRT_END(altivec_unavailable, 0x4f20, 0x20)
TRAMP_KVM_BEGIN(altivec_unavailable_kvm)
GEN_KVM altivec_unavailable
EXC_COMMON_BEGIN(altivec_unavailable_common)
GEN_COMMON altivec_unavailable
#ifdef CONFIG_ALTIVEC
@ -1986,6 +2014,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
bl altivec_unavailable_exception
b ret_from_except
GEN_KVM altivec_unavailable
INT_DEFINE_BEGIN(vsx_unavailable)
IVEC=0xf40
@ -1999,8 +2029,6 @@ EXC_REAL_END(vsx_unavailable, 0xf40, 0x20)
EXC_VIRT_BEGIN(vsx_unavailable, 0x4f40, 0x20)
GEN_INT_ENTRY vsx_unavailable, virt=1, ool=1
EXC_VIRT_END(vsx_unavailable, 0x4f40, 0x20)
TRAMP_KVM_BEGIN(vsx_unavailable_kvm)
GEN_KVM vsx_unavailable
EXC_COMMON_BEGIN(vsx_unavailable_common)
GEN_COMMON vsx_unavailable
#ifdef CONFIG_VSX
@ -2033,6 +2061,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_VSX)
bl vsx_unavailable_exception
b ret_from_except
GEN_KVM vsx_unavailable
INT_DEFINE_BEGIN(facility_unavailable)
IVEC=0xf60
@ -2045,8 +2075,6 @@ EXC_REAL_END(facility_unavailable, 0xf60, 0x20)
EXC_VIRT_BEGIN(facility_unavailable, 0x4f60, 0x20)
GEN_INT_ENTRY facility_unavailable, virt=1, ool=1
EXC_VIRT_END(facility_unavailable, 0x4f60, 0x20)
TRAMP_KVM_BEGIN(facility_unavailable_kvm)
GEN_KVM facility_unavailable
EXC_COMMON_BEGIN(facility_unavailable_common)
GEN_COMMON facility_unavailable
bl save_nvgprs
@ -2054,6 +2082,8 @@ EXC_COMMON_BEGIN(facility_unavailable_common)
bl facility_unavailable_exception
b ret_from_except
GEN_KVM facility_unavailable
INT_DEFINE_BEGIN(h_facility_unavailable)
IVEC=0xf80
@ -2068,8 +2098,6 @@ EXC_REAL_END(h_facility_unavailable, 0xf80, 0x20)
EXC_VIRT_BEGIN(h_facility_unavailable, 0x4f80, 0x20)
GEN_INT_ENTRY h_facility_unavailable, virt=1, ool=1
EXC_VIRT_END(h_facility_unavailable, 0x4f80, 0x20)
TRAMP_KVM_BEGIN(h_facility_unavailable_kvm)
GEN_KVM h_facility_unavailable
EXC_COMMON_BEGIN(h_facility_unavailable_common)
GEN_COMMON h_facility_unavailable
bl save_nvgprs
@ -2077,6 +2105,8 @@ EXC_COMMON_BEGIN(h_facility_unavailable_common)
bl facility_unavailable_exception
b ret_from_except
GEN_KVM h_facility_unavailable
EXC_REAL_NONE(0xfa0, 0x20)
EXC_VIRT_NONE(0x4fa0, 0x20)
@ -2102,14 +2132,15 @@ EXC_REAL_BEGIN(cbe_system_error, 0x1200, 0x100)
GEN_INT_ENTRY cbe_system_error, virt=0
EXC_REAL_END(cbe_system_error, 0x1200, 0x100)
EXC_VIRT_NONE(0x5200, 0x100)
TRAMP_KVM_BEGIN(cbe_system_error_kvm)
GEN_KVM cbe_system_error
EXC_COMMON_BEGIN(cbe_system_error_common)
GEN_COMMON cbe_system_error
bl save_nvgprs
addi r3,r1,STACK_FRAME_OVERHEAD
bl cbe_system_error_exception
b ret_from_except
GEN_KVM cbe_system_error
#else /* CONFIG_CBE_RAS */
EXC_REAL_NONE(0x1200, 0x100)
EXC_VIRT_NONE(0x5200, 0x100)
@ -2128,8 +2159,6 @@ EXC_REAL_END(instruction_breakpoint, 0x1300, 0x100)
EXC_VIRT_BEGIN(instruction_breakpoint, 0x5300, 0x100)
GEN_INT_ENTRY instruction_breakpoint, virt=1
EXC_VIRT_END(instruction_breakpoint, 0x5300, 0x100)
TRAMP_KVM_BEGIN(instruction_breakpoint_kvm)
GEN_KVM instruction_breakpoint
EXC_COMMON_BEGIN(instruction_breakpoint_common)
GEN_COMMON instruction_breakpoint
bl save_nvgprs
@ -2137,6 +2166,8 @@ EXC_COMMON_BEGIN(instruction_breakpoint_common)
bl instruction_breakpoint_exception
b ret_from_except
GEN_KVM instruction_breakpoint
EXC_REAL_NONE(0x1400, 0x100)
EXC_VIRT_NONE(0x5400, 0x100)
@ -2145,6 +2176,7 @@ INT_DEFINE_BEGIN(denorm_exception)
IVEC=0x1500
IHSRR=EXC_HV
IEARLY=2
IKVM_REAL=1
INT_DEFINE_END(denorm_exception)
EXC_REAL_BEGIN(denorm_exception, 0x1500, 0x100)
@ -2154,7 +2186,6 @@ EXC_REAL_BEGIN(denorm_exception, 0x1500, 0x100)
andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */
bne+ denorm_assist
#endif
KVMTEST denorm_exception, EXC_HV, 0x1500
mfspr r11,SPRN_HSRR0
mfspr r12,SPRN_HSRR1
GEN_BRANCH_TO_COMMON denorm_exception, virt=0
@ -2172,8 +2203,6 @@ EXC_VIRT_END(denorm_exception, 0x5500, 0x100)
#else
EXC_VIRT_NONE(0x5500, 0x100)
#endif
TRAMP_KVM_BEGIN(denorm_exception_kvm)
GEN_KVM denorm_exception
#ifdef CONFIG_PPC_DENORMALISATION
TRAMP_REAL_BEGIN(denorm_assist)
@ -2251,6 +2280,8 @@ EXC_COMMON_BEGIN(denorm_exception_common)
bl unknown_exception
b ret_from_except
GEN_KVM denorm_exception
#ifdef CONFIG_CBE_RAS
INT_DEFINE_BEGIN(cbe_maintenance)
@ -2264,14 +2295,15 @@ EXC_REAL_BEGIN(cbe_maintenance, 0x1600, 0x100)
GEN_INT_ENTRY cbe_maintenance, virt=0
EXC_REAL_END(cbe_maintenance, 0x1600, 0x100)
EXC_VIRT_NONE(0x5600, 0x100)
TRAMP_KVM_BEGIN(cbe_maintenance_kvm)
GEN_KVM cbe_maintenance
EXC_COMMON_BEGIN(cbe_maintenance_common)
GEN_COMMON cbe_maintenance
bl save_nvgprs
addi r3,r1,STACK_FRAME_OVERHEAD
bl cbe_maintenance_exception
b ret_from_except
GEN_KVM cbe_maintenance
#else /* CONFIG_CBE_RAS */
EXC_REAL_NONE(0x1600, 0x100)
EXC_VIRT_NONE(0x5600, 0x100)
@ -2289,8 +2321,6 @@ EXC_REAL_END(altivec_assist, 0x1700, 0x100)
EXC_VIRT_BEGIN(altivec_assist, 0x5700, 0x100)
GEN_INT_ENTRY altivec_assist, virt=1
EXC_VIRT_END(altivec_assist, 0x5700, 0x100)
TRAMP_KVM_BEGIN(altivec_assist_kvm)
GEN_KVM altivec_assist
EXC_COMMON_BEGIN(altivec_assist_common)
GEN_COMMON altivec_assist
bl save_nvgprs
@ -2302,6 +2332,8 @@ EXC_COMMON_BEGIN(altivec_assist_common)
#endif
b ret_from_except
GEN_KVM altivec_assist
#ifdef CONFIG_CBE_RAS
INT_DEFINE_BEGIN(cbe_thermal)
@ -2315,14 +2347,15 @@ EXC_REAL_BEGIN(cbe_thermal, 0x1800, 0x100)
GEN_INT_ENTRY cbe_thermal, virt=0
EXC_REAL_END(cbe_thermal, 0x1800, 0x100)
EXC_VIRT_NONE(0x5800, 0x100)
TRAMP_KVM_BEGIN(cbe_thermal_kvm)
GEN_KVM cbe_thermal
EXC_COMMON_BEGIN(cbe_thermal_common)
GEN_COMMON cbe_thermal
bl save_nvgprs
addi r3,r1,STACK_FRAME_OVERHEAD
bl cbe_thermal_exception
b ret_from_except
GEN_KVM cbe_thermal
#else /* CONFIG_CBE_RAS */
EXC_REAL_NONE(0x1800, 0x100)
EXC_VIRT_NONE(0x5800, 0x100)
@ -2514,17 +2547,12 @@ TRAMP_REAL_BEGIN(hrfi_flush_fallback)
GET_SCRATCH0(r13);
hrfid
/*
* Real mode exceptions actually use this too, but alternate
* instruction code patches (which end up in the common .text area)
* cannot reach these if they are put there.
*/
USE_TEXT_SECTION()
MASKED_INTERRUPT EXC_STD
MASKED_INTERRUPT EXC_HV
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
TRAMP_REAL_BEGIN(kvmppc_skip_interrupt)
kvmppc_skip_interrupt:
/*
* Here all GPRs are unchanged from when the interrupt happened
* except for r13, which is saved in SPRG_SCRATCH0.
@ -2536,7 +2564,7 @@ TRAMP_REAL_BEGIN(kvmppc_skip_interrupt)
RFI_TO_KERNEL
b .
TRAMP_REAL_BEGIN(kvmppc_skip_Hinterrupt)
kvmppc_skip_Hinterrupt:
/*
* Here all GPRs are unchanged from when the interrupt happened
* except for r13, which is saved in SPRG_SCRATCH0.
@ -2549,16 +2577,6 @@ TRAMP_REAL_BEGIN(kvmppc_skip_Hinterrupt)
b .
#endif
/*
* Ensure that any handlers that get invoked from the exception prologs
* above are below the first 64KB (0x10000) of the kernel image because
* the prologs assemble the addresses of these handlers using the
* LOAD_HANDLER macro, which uses an ori instruction.
*/
/*** Common interrupt handlers ***/
/*
* Relocation-on interrupts: A subset of the interrupts can be delivered
* with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering

11
arch/powerpc/kvm/book3s_hv_rmhandlers.S
View File

@ -1266,7 +1266,6 @@ kvmppc_interrupt_hv:
* R12 = (guest CR << 32) | interrupt vector
* R13 = PACA
* 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)
@ -1367,12 +1366,7 @@ 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)
@ -3258,7 +3252,6 @@ END_FTR_SECTION_IFCLR(CPU_FTR_P9_TM_HV_ASSIST)
* r12 is (CR << 32) | vector
* r13 points to our PACA
* r12 is saved in HSTATE_SCRATCH0(r13)
* ctr is saved in HSTATE_SCRATCH1(r13) if RELOCATABLE
* r9 is saved in HSTATE_SCRATCH2(r13)
* r13 is saved in HSPRG1
* cfar is saved in HSTATE_CFAR(r13)
@ -3307,11 +3300,7 @@ kvmppc_bad_host_intr:
ld r5, HSTATE_CFAR(r13)
std r5, ORIG_GPR3(r1)
mflr r3
#ifdef CONFIG_RELOCATABLE
ld r4, HSTATE_SCRATCH1(r13)
#else
mfctr r4
#endif
mfxer r5
lbz r6, PACAIRQSOFTMASK(r13)
std r3, _LINK(r1)

7
arch/powerpc/kvm/book3s_segment.S
View File

@ -167,16 +167,9 @@ kvmppc_interrupt_pr:
* 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 */