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Merge branch 'guarded-storage' into 'features' to make merging with

Browse Source 
the KVM tree easier.
This commit is contained in:
Martin Schwidefsky 2017-03-22 08:22:02 +01:00
commit bffc880b45
27 changed files with 435 additions and 45 deletions
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1
arch/s390/include/asm/elf.h
View File

@ -105,6 +105,7 @@
#define HWCAP_S390_VXRS 2048
#define HWCAP_S390_VXRS_BCD 4096
#define HWCAP_S390_VXRS_EXT 8192
#define HWCAP_S390_GS 16384
/* Internal bits, not exposed via elf */
#define HWCAP_INT_SIE 1UL

9
arch/s390/include/asm/lowcore.h
View File

@ -157,8 +157,8 @@ struct lowcore {
__u64 stfle_fac_list[32]; /* 0x0f00 */
__u8 pad_0x1000[0x11b0-0x1000]; /* 0x1000 */
/* Pointer to vector register save area */
__u64 vector_save_area_addr; /* 0x11b0 */
/* Pointer to the machine check extended save area */
__u64 mcesad; /* 0x11b0 */
/* 64 bit extparam used for pfault/diag 250: defined by architecture */
__u64 ext_params2; /* 0x11B8 */
@ -182,10 +182,7 @@ struct lowcore {
/* Transaction abort diagnostic block */
__u8 pgm_tdb[256]; /* 0x1800 */
__u8 pad_0x1900[0x1c00-0x1900]; /* 0x1900 */
/* Software defined save area for vector registers */
__u8 vector_save_area[1024]; /* 0x1c00 */
__u8 pad_0x1900[0x2000-0x1900]; /* 0x1900 */
} __packed;
#define S390_lowcore (*((struct lowcore *) 0))

12
arch/s390/include/asm/nmi.h
View File

@ -58,7 +58,9 @@ union mci {
u64 ie : 1; /* 32 indirect storage error */
u64 ar : 1; /* 33 access register validity */
u64 da : 1; /* 34 delayed access exception */
u64 : 7; /* 35-41 */
u64 : 1; /* 35 */
u64 gs : 1; /* 36 guarded storage registers */
u64 : 5; /* 37-41 */
u64 pr : 1; /* 42 tod programmable register validity */
u64 fc : 1; /* 43 fp control register validity */
u64 ap : 1; /* 44 ancillary report */
@ -69,6 +71,14 @@ union mci {
};
};
#define MCESA_ORIGIN_MASK (~0x3ffUL)
#define MCESA_LC_MASK (0xfUL)
struct mcesa {
u8 vector_save_area[1024];
u8 guarded_storage_save_area[32];
};
struct pt_regs;
extern void s390_handle_mcck(void);

5
arch/s390/include/asm/processor.h
View File

@ -135,6 +135,8 @@ struct thread_struct {
struct list_head list;
/* cpu runtime instrumentation */
struct runtime_instr_cb *ri_cb;
struct gs_cb *gs_cb; /* Current guarded storage cb */
struct gs_cb *gs_bc_cb; /* Broadcast guarded storage cb */
unsigned char trap_tdb[256]; /* Transaction abort diagnose block */
/*
* Warning: 'fpu' is dynamically-sized. It *MUST* be at
@ -215,6 +217,9 @@ void show_cacheinfo(struct seq_file *m);
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/* Free guarded storage control block for current */
void exit_thread_gs(void);
/*
* Return saved PC of a blocked thread.
*/

2
arch/s390/include/asm/setup.h
View File

@ -31,6 +31,7 @@
#define MACHINE_FLAG_VX _BITUL(13)
#define MACHINE_FLAG_CAD _BITUL(14)
#define MACHINE_FLAG_NX _BITUL(15)
#define MACHINE_FLAG_GS _BITUL(16)
#define LPP_MAGIC _BITUL(31)
#define LPP_PFAULT_PID_MASK _AC(0xffffffff, UL)
@ -70,6 +71,7 @@ extern void detect_memory_memblock(void);
#define MACHINE_HAS_VX (S390_lowcore.machine_flags & MACHINE_FLAG_VX)
#define MACHINE_HAS_CAD (S390_lowcore.machine_flags & MACHINE_FLAG_CAD)
#define MACHINE_HAS_NX (S390_lowcore.machine_flags & MACHINE_FLAG_NX)
#define MACHINE_HAS_GS (S390_lowcore.machine_flags & MACHINE_FLAG_GS)
/*
* Console mode. Override with conmode=

3
arch/s390/include/asm/switch_to.h
View File

@ -10,6 +10,7 @@
#include <linux/thread_info.h>
#include <asm/fpu/api.h>
#include <asm/ptrace.h>
#include <asm/guarded_storage.h>
extern struct task_struct *__switch_to(void *, void *);
extern void update_cr_regs(struct task_struct *task);
@ -33,12 +34,14 @@ static inline void restore_access_regs(unsigned int *acrs)
save_fpu_regs(); \
save_access_regs(&prev->thread.acrs[0]); \
save_ri_cb(prev->thread.ri_cb); \
save_gs_cb(prev->thread.gs_cb); \
} \
if (next->mm) { \
update_cr_regs(next); \
set_cpu_flag(CIF_FPU); \
restore_access_regs(&next->thread.acrs[0]); \
restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \
restore_gs_cb(next->thread.gs_cb); \
} \
prev = __switch_to(prev,next); \
} while (0)

12
arch/s390/include/asm/thread_info.h
View File

@ -54,11 +54,12 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
#define TIF_NOTIFY_RESUME 0 /* callback before returning to user */
#define TIF_SIGPENDING 1 /* signal pending */
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
#define TIF_SYSCALL_TRACE 3 /* syscall trace active */
#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
#define TIF_SECCOMP 5 /* secure computing */
#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
#define TIF_UPROBE 7 /* breakpointed or single-stepping */
#define TIF_UPROBE 3 /* breakpointed or single-stepping */
#define TIF_GUARDED_STORAGE 4 /* load guarded storage control block */
#define TIF_SYSCALL_TRACE 8 /* syscall trace active */
#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
#define TIF_SECCOMP 10 /* secure computing */
#define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */
#define TIF_31BIT 16 /* 32bit process */
#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal() */
@ -76,5 +77,6 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
#define _TIF_UPROBE _BITUL(TIF_UPROBE)
#define _TIF_31BIT _BITUL(TIF_31BIT)
#define _TIF_SINGLE_STEP _BITUL(TIF_SINGLE_STEP)
#define _TIF_GUARDED_STORAGE _BITUL(TIF_GUARDED_STORAGE)
#endif /* _ASM_THREAD_INFO_H */

1
arch/s390/include/uapi/asm/Kbuild
View File

@ -12,6 +12,7 @@ header-y += dasd.h
header-y += debug.h
header-y += errno.h
header-y += fcntl.h
header-y += guarded_storage.h
header-y += hypfs.h
header-y += ioctl.h
header-y += ioctls.h

77
arch/s390/include/uapi/asm/guarded_storage.h Normal file
View File

@ -0,0 +1,77 @@
#ifndef _GUARDED_STORAGE_H
#define _GUARDED_STORAGE_H
#include <linux/types.h>
struct gs_cb {
__u64 reserved;
__u64 gsd;
__u64 gssm;
__u64 gs_epl_a;
};
struct gs_epl {
__u8 pad1;
union {
__u8 gs_eam;
struct {
__u8 : 6;
__u8 e : 1;
__u8 b : 1;
};
};
union {
__u8 gs_eci;
struct {
__u8 tx : 1;
__u8 cx : 1;
__u8 : 5;
__u8 in : 1;
};
};
union {
__u8 gs_eai;
struct {
__u8 : 1;
__u8 t : 1;
__u8 as : 2;
__u8 ar : 4;
};
};
__u32 pad2;
__u64 gs_eha;
__u64 gs_eia;
__u64 gs_eoa;
__u64 gs_eir;
__u64 gs_era;
};
#define GS_ENABLE 0
#define GS_DISABLE 1
#define GS_SET_BC_CB 2
#define GS_CLEAR_BC_CB 3
#define GS_BROADCAST 4
static inline void load_gs_cb(struct gs_cb *gs_cb)
{
asm volatile(".insn rxy,0xe3000000004d,0,%0" : : "Q" (*gs_cb));
}
static inline void store_gs_cb(struct gs_cb *gs_cb)
{
asm volatile(".insn rxy,0xe30000000049,0,%0" : : "Q" (*gs_cb));
}
static inline void save_gs_cb(struct gs_cb *gs_cb)
{
if (gs_cb)
store_gs_cb(gs_cb);
}
static inline void restore_gs_cb(struct gs_cb *gs_cb)
{
if (gs_cb)
load_gs_cb(gs_cb);
}
#endif /* _GUARDED_STORAGE_H */

2
arch/s390/include/uapi/asm/unistd.h
View File

@ -313,7 +313,7 @@
#define __NR_copy_file_range 375
#define __NR_preadv2 376
#define __NR_pwritev2 377
/* Number 378 is reserved for guarded storage */
#define __NR_s390_guarded_storage 378
#define __NR_statx 379
#define NR_syscalls 380

2
arch/s390/kernel/Makefile
View File

@ -57,7 +57,7 @@ obj-y := traps.o time.o process.o base.o early.o setup.o idle.o vtime.o
obj-y += processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
obj-y += debug.o irq.o ipl.o dis.o diag.o vdso.o als.o
obj-y += sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o
obj-y += runtime_instr.o cache.o fpu.o dumpstack.o
obj-y += runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o
obj-y += entry.o reipl.o relocate_kernel.o
extra-y += head.o head64.o vmlinux.lds

2
arch/s390/kernel/asm-offsets.c
View File

@ -175,7 +175,7 @@ int main(void)
/* software defined ABI-relevant lowcore locations 0xe00 - 0xe20 */
OFFSET(__LC_DUMP_REIPL, lowcore, ipib);
/* hardware defined lowcore locations 0x1000 - 0x18ff */
OFFSET(__LC_VX_SAVE_AREA_ADDR, lowcore, vector_save_area_addr);
OFFSET(__LC_MCESAD, lowcore, mcesad);
OFFSET(__LC_EXT_PARAMS2, lowcore, ext_params2);
OFFSET(__LC_FPREGS_SAVE_AREA, lowcore, floating_pt_save_area);
OFFSET(__LC_GPREGS_SAVE_AREA, lowcore, gpregs_save_area);

1
arch/s390/kernel/compat_wrapper.c
View File

@ -178,4 +178,5 @@ COMPAT_SYSCALL_WRAP3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
COMPAT_SYSCALL_WRAP6(sendto, int, fd, void __user *, buff, size_t, len, unsigned int, flags, struct sockaddr __user *, addr, int, addr_len);
COMPAT_SYSCALL_WRAP3(mlock2, unsigned long, start, size_t, len, int, flags);
COMPAT_SYSCALL_WRAP6(copy_file_range, int, fd_in, loff_t __user *, off_in, int, fd_out, loff_t __user *, off_out, size_t, len, unsigned int, flags);
COMPAT_SYSCALL_WRAP2(s390_guarded_storage, int, command, struct gs_cb *, gs_cb);
COMPAT_SYSCALL_WRAP5(statx, int, dfd, const char __user *, path, unsigned, flags, unsigned, mask, struct statx __user *, buffer);

2
arch/s390/kernel/early.c
View File

@ -358,6 +358,8 @@ static __init void detect_machine_facilities(void)
S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
__ctl_set_bit(0, 20);
}
if (test_facility(133))
S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
}
static inline void save_vector_registers(void)

26
arch/s390/kernel/entry.S
View File

@ -47,7 +47,7 @@ STACK_SIZE = 1 << STACK_SHIFT
STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE
_TIF_WORK = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
_TIF_UPROBE)
_TIF_UPROBE | _TIF_GUARDED_STORAGE)
_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
_TIF_SYSCALL_TRACEPOINT)
_CIF_WORK = (_CIF_MCCK_PENDING | _CIF_ASCE_PRIMARY | \
@ -332,6 +332,8 @@ ENTRY(system_call)
TSTMSK __TI_flags(%r12),_TIF_UPROBE
jo .Lsysc_uprobe_notify
#endif
TSTMSK __TI_flags(%r12),_TIF_GUARDED_STORAGE
jo .Lsysc_guarded_storage
TSTMSK __PT_FLAGS(%r11),_PIF_PER_TRAP
jo .Lsysc_singlestep
TSTMSK __TI_flags(%r12),_TIF_SIGPENDING
@ -408,6 +410,14 @@ ENTRY(system_call)
jg uprobe_notify_resume
#endif
#
# _TIF_GUARDED_STORAGE is set, call guarded_storage_load
#
.Lsysc_guarded_storage:
lgr %r2,%r11 # pass pointer to pt_regs
larl %r14,.Lsysc_return
jg gs_load_bc_cb
#
# _PIF_PER_TRAP is set, call do_per_trap
#
@ -663,6 +673,8 @@ ENTRY(io_int_handler)
jo .Lio_sigpending
TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME
jo .Lio_notify_resume
TSTMSK __TI_flags(%r12),_TIF_GUARDED_STORAGE
jo .Lio_guarded_storage
TSTMSK __LC_CPU_FLAGS,_CIF_FPU
jo .Lio_vxrs
TSTMSK __LC_CPU_FLAGS,(_CIF_ASCE_PRIMARY|_CIF_ASCE_SECONDARY)
@ -696,6 +708,18 @@ ENTRY(io_int_handler)
larl %r14,.Lio_return
jg load_fpu_regs
#
# _TIF_GUARDED_STORAGE is set, call guarded_storage_load
#
.Lio_guarded_storage:
# TRACE_IRQS_ON already done at .Lio_return
ssm __LC_SVC_NEW_PSW # reenable interrupts
lgr %r2,%r11 # pass pointer to pt_regs
brasl %r14,gs_load_bc_cb
ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
TRACE_IRQS_OFF
j .Lio_return
#
# _TIF_NEED_RESCHED is set, call schedule
#

2
arch/s390/kernel/entry.h
View File

@ -74,12 +74,14 @@ long sys_sigreturn(void);
long sys_s390_personality(unsigned int personality);
long sys_s390_runtime_instr(int command, int signum);
long sys_s390_guarded_storage(int command, struct gs_cb __user *);
long sys_s390_pci_mmio_write(unsigned long, const void __user *, size_t);
long sys_s390_pci_mmio_read(unsigned long, void __user *, size_t);
DECLARE_PER_CPU(u64, mt_cycles[8]);
void verify_facilities(void);
void gs_load_bc_cb(struct pt_regs *regs);
void set_fs_fixup(void);
#endif /* _ENTRY_H */

128
arch/s390/kernel/guarded_storage.c Normal file
View File

@ -0,0 +1,128 @@
/*
* Copyright IBM Corp. 2016
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#include <linux/kernel.h>
#include <linux/syscalls.h>
#include <linux/signal.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <asm/guarded_storage.h>
#include "entry.h"
void exit_thread_gs(void)
{
kfree(current->thread.gs_cb);
kfree(current->thread.gs_bc_cb);
current->thread.gs_cb = current->thread.gs_bc_cb = NULL;
}
static int gs_enable(void)
{
struct gs_cb *gs_cb;
if (!current->thread.gs_cb) {
gs_cb = kzalloc(sizeof(*gs_cb), GFP_KERNEL);
if (!gs_cb)
return -ENOMEM;
gs_cb->gsd = 25;
preempt_disable();
__ctl_set_bit(2, 4);
load_gs_cb(gs_cb);
current->thread.gs_cb = gs_cb;
preempt_enable();
}
return 0;
}
static int gs_disable(void)
{
if (current->thread.gs_cb) {
preempt_disable();
kfree(current->thread.gs_cb);
current->thread.gs_cb = NULL;
__ctl_clear_bit(2, 4);
preempt_enable();
}
return 0;
}
static int gs_set_bc_cb(struct gs_cb __user *u_gs_cb)
{
struct gs_cb *gs_cb;
gs_cb = current->thread.gs_bc_cb;
if (!gs_cb) {
gs_cb = kzalloc(sizeof(*gs_cb), GFP_KERNEL);
if (!gs_cb)
return -ENOMEM;
current->thread.gs_bc_cb = gs_cb;
}
if (copy_from_user(gs_cb, u_gs_cb, sizeof(*gs_cb)))
return -EFAULT;
return 0;
}
static int gs_clear_bc_cb(void)
{
struct gs_cb *gs_cb;
gs_cb = current->thread.gs_bc_cb;
current->thread.gs_bc_cb = NULL;
kfree(gs_cb);
return 0;
}
void gs_load_bc_cb(struct pt_regs *regs)
{
struct gs_cb *gs_cb;
preempt_disable();
clear_thread_flag(TIF_GUARDED_STORAGE);
gs_cb = current->thread.gs_bc_cb;
if (gs_cb) {
kfree(current->thread.gs_cb);
current->thread.gs_bc_cb = NULL;
__ctl_set_bit(2, 4);
load_gs_cb(gs_cb);
current->thread.gs_cb = gs_cb;
}
preempt_enable();
}
static int gs_broadcast(void)
{
struct task_struct *sibling;
read_lock(&tasklist_lock);
for_each_thread(current, sibling) {
if (!sibling->thread.gs_bc_cb)
continue;
if (test_and_set_tsk_thread_flag(sibling, TIF_GUARDED_STORAGE))
kick_process(sibling);
}
read_unlock(&tasklist_lock);
return 0;
}
SYSCALL_DEFINE2(s390_guarded_storage, int, command,
struct gs_cb __user *, gs_cb)
{
if (!MACHINE_HAS_GS)
return -EOPNOTSUPP;
switch (command) {
case GS_ENABLE:
return gs_enable();
case GS_DISABLE:
return gs_disable();
case GS_SET_BC_CB:
return gs_set_bc_cb(gs_cb);
case GS_CLEAR_BC_CB:
return gs_clear_bc_cb();
case GS_BROADCAST:
return gs_broadcast();
default:
return -EINVAL;
}
}

13
arch/s390/kernel/machine_kexec.c
View File

@ -27,6 +27,7 @@
#include <asm/cacheflush.h>
#include <asm/os_info.h>
#include <asm/switch_to.h>
#include <asm/nmi.h>
typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
@ -102,6 +103,8 @@ static void __do_machine_kdump(void *image)
*/
static noinline void __machine_kdump(void *image)
{
struct mcesa *mcesa;
unsigned long cr2_old, cr2_new;
int this_cpu, cpu;
lgr_info_log();
@ -114,8 +117,16 @@ static noinline void __machine_kdump(void *image)
continue;
}
/* Store status of the boot CPU */
mcesa = (struct mcesa *)(S390_lowcore.mcesad & MCESA_ORIGIN_MASK);
if (MACHINE_HAS_VX)
save_vx_regs((void *) &S390_lowcore.vector_save_area);
save_vx_regs((__vector128 *) mcesa->vector_save_area);
if (MACHINE_HAS_GS) {
__ctl_store(cr2_old, 2, 2);
cr2_new = cr2_old | (1UL << 4);
__ctl_load(cr2_new, 2, 2);
save_gs_cb((struct gs_cb *) mcesa->guarded_storage_save_area);
__ctl_load(cr2_old, 2, 2);
}
/*
* To create a good backchain for this CPU in the dump store_status
* is passed the address of a function. The address is saved into

19
arch/s390/kernel/nmi.c
View File

@ -106,6 +106,7 @@ static int notrace s390_validate_registers(union mci mci, int umode)
int kill_task;
u64 zero;
void *fpt_save_area;
struct mcesa *mcesa;
kill_task = 0;
zero = 0;
@ -165,6 +166,7 @@ static int notrace s390_validate_registers(union mci mci, int umode)
: : "Q" (S390_lowcore.fpt_creg_save_area));
}
mcesa = (struct mcesa *)(S390_lowcore.mcesad & MCESA_ORIGIN_MASK);
if (!MACHINE_HAS_VX) {
/* Validate floating point registers */
asm volatile(
@ -209,8 +211,8 @@ static int notrace s390_validate_registers(union mci mci, int umode)
" la 1,%0\n"
" .word 0xe70f,0x1000,0x0036\n" /* vlm 0,15,0(1) */
" .word 0xe70f,0x1100,0x0c36\n" /* vlm 16,31,256(1) */
: : "Q" (*(struct vx_array *)
&S390_lowcore.vector_save_area) : "1");
: : "Q" (*(struct vx_array *) mcesa->vector_save_area)
: "1");
__ctl_load(S390_lowcore.cregs_save_area[0], 0, 0);
}
/* Validate access registers */
@ -224,6 +226,19 @@ static int notrace s390_validate_registers(union mci mci, int umode)
*/
kill_task = 1;
}
/* Validate guarded storage registers */
if (MACHINE_HAS_GS && (S390_lowcore.cregs_save_area[2] & (1UL << 4))) {
if (!mci.gs)
/*
* Guarded storage register can't be restored and
* the current processes uses guarded storage.
* It has to be terminated.
*/
kill_task = 1;
else
load_gs_cb((struct gs_cb *)
mcesa->guarded_storage_save_area);
}
/*
* We don't even try to validate the TOD register, since we simply
* can't write something sensible into that register.

7
arch/s390/kernel/process.c
View File

@ -73,8 +73,10 @@ extern void kernel_thread_starter(void);
*/
void exit_thread(struct task_struct *tsk)
{
if (tsk == current)
if (tsk == current) {
exit_thread_runtime_instr();
exit_thread_gs();
}
}
void flush_thread(void)
@ -159,6 +161,9 @@ int copy_thread_tls(unsigned long clone_flags, unsigned long new_stackp,
/* Don't copy runtime instrumentation info */
p->thread.ri_cb = NULL;
frame->childregs.psw.mask &= ~PSW_MASK_RI;
/* Don't copy guarded storage control block */
p->thread.gs_cb = NULL;
p->thread.gs_bc_cb = NULL;
/* Set a new TLS ? */
if (clone_flags & CLONE_SETTLS) {

2
arch/s390/kernel/processor.c
View File

@ -95,7 +95,7 @@ static void show_cpu_summary(struct seq_file *m, void *v)
{
static const char *hwcap_str[] = {
"esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
"edat", "etf3eh", "highgprs", "te", "vx", "vxd", "vxe"
"edat", "etf3eh", "highgprs", "te", "vx", "vxd", "vxe", "gs"
};
static const char * const int_hwcap_str[] = {
"sie"

84
arch/s390/kernel/ptrace.c
View File

@ -44,30 +44,42 @@ void update_cr_regs(struct task_struct *task)
struct pt_regs *regs = task_pt_regs(task);
struct thread_struct *thread = &task->thread;
struct per_regs old, new;
unsigned long cr0_old, cr0_new;
unsigned long cr2_old, cr2_new;
int cr0_changed, cr2_changed;
__ctl_store(cr0_old, 0, 0);
__ctl_store(cr2_old, 2, 2);
cr0_new = cr0_old;
cr2_new = cr2_old;
/* Take care of the enable/disable of transactional execution. */
if (MACHINE_HAS_TE) {
unsigned long cr, cr_new;
__ctl_store(cr, 0, 0);
/* Set or clear transaction execution TXC bit 8. */
cr_new = cr | (1UL << 55);
cr0_new |= (1UL << 55);
if (task->thread.per_flags & PER_FLAG_NO_TE)
cr_new &= ~(1UL << 55);
if (cr_new != cr)
__ctl_load(cr_new, 0, 0);
cr0_new &= ~(1UL << 55);
/* Set or clear transaction execution TDC bits 62 and 63. */
__ctl_store(cr, 2, 2);
cr_new = cr & ~3UL;
cr2_new &= ~3UL;
if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND)
cr_new |= 1UL;
cr2_new |= 1UL;
else
cr_new |= 2UL;
cr2_new |= 2UL;
}
if (cr_new != cr)
__ctl_load(cr_new, 2, 2);
}
/* Take care of enable/disable of guarded storage. */
if (MACHINE_HAS_GS) {
cr2_new &= ~(1UL << 4);
if (task->thread.gs_cb)
cr2_new |= (1UL << 4);
}
/* Load control register 0/2 iff changed */
cr0_changed = cr0_new != cr0_old;
cr2_changed = cr2_new != cr2_old;
if (cr0_changed)
__ctl_load(cr0_new, 0, 0);
if (cr2_changed)
__ctl_load(cr2_new, 2, 2);
/* Copy user specified PER registers */
new.control = thread->per_user.control;
new.start = thread->per_user.start;
@ -1137,6 +1149,36 @@ static int s390_system_call_set(struct task_struct *target,
data, 0, sizeof(unsigned int));
}
static int s390_gs_cb_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
struct gs_cb *data = target->thread.gs_cb;
if (!MACHINE_HAS_GS)
return -ENODEV;
if (!data)
return -ENODATA;
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
data, 0, sizeof(struct gs_cb));
}
static int s390_gs_cb_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct gs_cb *data = target->thread.gs_cb;
if (!MACHINE_HAS_GS)
return -ENODEV;
if (!data)
return -ENODATA;
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
data, 0, sizeof(struct gs_cb));
}
static const struct user_regset s390_regsets[] = {
{
.core_note_type = NT_PRSTATUS,
@ -1194,6 +1236,14 @@ static const struct user_regset s390_regsets[] = {
.get = s390_vxrs_high_get,
.set = s390_vxrs_high_set,
},
{
.core_note_type = NT_S390_GS_CB,
.n = sizeof(struct gs_cb) / sizeof(__u64),
.size = sizeof(__u64),
.align = sizeof(__u64),
.get = s390_gs_cb_get,
.set = s390_gs_cb_set,
},
};
static const struct user_regset_view user_s390_view = {
@ -1422,6 +1472,14 @@ static const struct user_regset s390_compat_regsets[] = {
.get = s390_compat_regs_high_get,
.set = s390_compat_regs_high_set,
},
{
.core_note_type = NT_S390_GS_CB,
.n = sizeof(struct gs_cb) / sizeof(__u64),
.size = sizeof(__u64),
.align = sizeof(__u64),
.get = s390_gs_cb_get,
.set = s390_gs_cb_set,
},
};
static const struct user_regset_view user_s390_compat_view = {

18
arch/s390/kernel/setup.c
View File

@ -339,9 +339,15 @@ static void __init setup_lowcore(void)
lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
MAX_FACILITY_BIT/8);
if (MACHINE_HAS_VX)
lc->vector_save_area_addr =
(unsigned long) &lc->vector_save_area;
if (MACHINE_HAS_VX || MACHINE_HAS_GS) {
unsigned long bits, size;
bits = MACHINE_HAS_GS ? 11 : 10;
size = 1UL << bits;
lc->mcesad = (__u64) memblock_virt_alloc(size, size);
if (MACHINE_HAS_GS)
lc->mcesad |= bits;
}
lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
lc->async_enter_timer = S390_lowcore.async_enter_timer;
@ -779,6 +785,12 @@ static int __init setup_hwcaps(void)
elf_hwcap |= HWCAP_S390_VXRS_BCD;
}
/*
* Guarded storage support HWCAP_S390_GS is bit 12.
*/
if (MACHINE_HAS_GS)
elf_hwcap |= HWCAP_S390_GS;
get_cpu_id(&cpu_id);
add_device_randomness(&cpu_id, sizeof(cpu_id));
switch (cpu_id.machine) {

43
arch/s390/kernel/smp.c
View File

@ -51,6 +51,7 @@
#include <asm/os_info.h>
#include <asm/sigp.h>
#include <asm/idle.h>
#include <asm/nmi.h>
#include "entry.h"
enum {
@ -78,6 +79,8 @@ struct pcpu {
static u8 boot_core_type;
static struct pcpu pcpu_devices[NR_CPUS];
static struct kmem_cache *pcpu_mcesa_cache;
unsigned int smp_cpu_mt_shift;
EXPORT_SYMBOL(smp_cpu_mt_shift);
@ -188,8 +191,10 @@ static void pcpu_ec_call(struct pcpu *pcpu, int ec_bit)
static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
{
unsigned long async_stack, panic_stack;
unsigned long mcesa_origin, mcesa_bits;
struct lowcore *lc;
mcesa_origin = mcesa_bits = 0;
if (pcpu != &pcpu_devices[0]) {
pcpu->lowcore = (struct lowcore *)
__get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER);
@ -197,20 +202,27 @@ static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
panic_stack = __get_free_page(GFP_KERNEL);
if (!pcpu->lowcore || !panic_stack || !async_stack)
goto out;
if (MACHINE_HAS_VX || MACHINE_HAS_GS) {
mcesa_origin = (unsigned long)
kmem_cache_alloc(pcpu_mcesa_cache, GFP_KERNEL);
if (!mcesa_origin)
goto out;
mcesa_bits = MACHINE_HAS_GS ? 11 : 0;
}
} else {
async_stack = pcpu->lowcore->async_stack - ASYNC_FRAME_OFFSET;
panic_stack = pcpu->lowcore->panic_stack - PANIC_FRAME_OFFSET;
mcesa_origin = pcpu->lowcore->mcesad & MCESA_ORIGIN_MASK;
mcesa_bits = pcpu->lowcore->mcesad & MCESA_LC_MASK;
}
lc = pcpu->lowcore;
memcpy(lc, &S390_lowcore, 512);
memset((char *) lc + 512, 0, sizeof(*lc) - 512);
lc->async_stack = async_stack + ASYNC_FRAME_OFFSET;
lc->panic_stack = panic_stack + PANIC_FRAME_OFFSET;
lc->mcesad = mcesa_origin | mcesa_bits;
lc->cpu_nr = cpu;
lc->spinlock_lockval = arch_spin_lockval(cpu);
if (MACHINE_HAS_VX)
lc->vector_save_area_addr =
(unsigned long) &lc->vector_save_area;
if (vdso_alloc_per_cpu(lc))
goto out;
lowcore_ptr[cpu] = lc;
@ -218,6 +230,9 @@ static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
return 0;
out:
if (pcpu != &pcpu_devices[0]) {
if (mcesa_origin)
kmem_cache_free(pcpu_mcesa_cache,
(void *) mcesa_origin);
free_page(panic_stack);
free_pages(async_stack, ASYNC_ORDER);
free_pages((unsigned long) pcpu->lowcore, LC_ORDER);
@ -229,11 +244,17 @@ out:
static void pcpu_free_lowcore(struct pcpu *pcpu)
{
unsigned long mcesa_origin;
pcpu_sigp_retry(pcpu, SIGP_SET_PREFIX, 0);
lowcore_ptr[pcpu - pcpu_devices] = NULL;
vdso_free_per_cpu(pcpu->lowcore);
if (pcpu == &pcpu_devices[0])
return;
if (MACHINE_HAS_VX || MACHINE_HAS_GS) {
mcesa_origin = pcpu->lowcore->mcesad & MCESA_ORIGIN_MASK;
kmem_cache_free(pcpu_mcesa_cache, (void *) mcesa_origin);
}
free_page(pcpu->lowcore->panic_stack-PANIC_FRAME_OFFSET);
free_pages(pcpu->lowcore->async_stack-ASYNC_FRAME_OFFSET, ASYNC_ORDER);
free_pages((unsigned long) pcpu->lowcore, LC_ORDER);
@ -550,9 +571,11 @@ int smp_store_status(int cpu)
if (__pcpu_sigp_relax(pcpu->address, SIGP_STORE_STATUS_AT_ADDRESS,
pa) != SIGP_CC_ORDER_CODE_ACCEPTED)
return -EIO;
if (!MACHINE_HAS_VX)
if (!MACHINE_HAS_VX && !MACHINE_HAS_GS)
return 0;
pa = __pa(pcpu->lowcore->vector_save_area_addr);
pa = __pa(pcpu->lowcore->mcesad & MCESA_ORIGIN_MASK);
if (MACHINE_HAS_GS)
pa |= pcpu->lowcore->mcesad & MCESA_LC_MASK;
if (__pcpu_sigp_relax(pcpu->address, SIGP_STORE_ADDITIONAL_STATUS,
pa) != SIGP_CC_ORDER_CODE_ACCEPTED)
return -EIO;
@ -897,12 +920,22 @@ void __init smp_fill_possible_mask(void)
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned long size;
/* request the 0x1201 emergency signal external interrupt */
if (register_external_irq(EXT_IRQ_EMERGENCY_SIG, do_ext_call_interrupt))
panic("Couldn't request external interrupt 0x1201");
/* request the 0x1202 external call external interrupt */
if (register_external_irq(EXT_IRQ_EXTERNAL_CALL, do_ext_call_interrupt))
panic("Couldn't request external interrupt 0x1202");
/* create slab cache for the machine-check-extended-save-areas */
if (MACHINE_HAS_VX || MACHINE_HAS_GS) {
size = 1UL << (MACHINE_HAS_GS ? 11 : 10);
pcpu_mcesa_cache = kmem_cache_create("nmi_save_areas",
size, size, 0, NULL);
if (!pcpu_mcesa_cache)
panic("Couldn't create nmi save area cache");
}
}
void __init smp_prepare_boot_cpu(void)

2
arch/s390/kernel/syscalls.S
View File

@ -386,5 +386,5 @@ SYSCALL(sys_mlock2,compat_sys_mlock2)
SYSCALL(sys_copy_file_range,compat_sys_copy_file_range) /* 375 */
SYSCALL(sys_preadv2,compat_sys_preadv2)
SYSCALL(sys_pwritev2,compat_sys_pwritev2)
NI_SYSCALL
SYSCALL(sys_s390_guarded_storage,compat_sys_s390_guarded_storage) /* 378 */
SYSCALL(sys_statx,compat_sys_statx)

4
arch/s390/kvm/interrupt.c
View File

@ -420,8 +420,8 @@ static int __write_machine_check(struct kvm_vcpu *vcpu,
save_access_regs(vcpu->run->s.regs.acrs);
/* Extended save area */
rc = read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR, &ext_sa_addr,
sizeof(unsigned long));
rc = read_guest_lc(vcpu, __LC_MCESAD, &ext_sa_addr,
sizeof(unsigned long));
/* Only bits 0-53 are used for address formation */
ext_sa_addr &= ~0x3ffUL;
if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {

1
include/uapi/linux/elf.h
View File

@ -409,6 +409,7 @@ typedef struct elf64_shdr {
#define NT_S390_TDB 0x308 /* s390 transaction diagnostic block */
#define NT_S390_VXRS_LOW 0x309 /* s390 vector registers 0-15 upper half */
#define NT_S390_VXRS_HIGH 0x30a /* s390 vector registers 16-31 */
#define NT_S390_GS_CB 0x30b /* s390 guarded storage registers */
#define NT_ARM_VFP 0x400 /* ARM VFP/NEON registers */
#define NT_ARM_TLS 0x401 /* ARM TLS register */
#define NT_ARM_HW_BREAK 0x402 /* ARM hardware breakpoint registers */