__ctl_load(reg, cr, cr);
}
+void __ctl_set_vx(void);
+
void smp_ctl_set_bit(int cr, int bit);
void smp_ctl_clear_bit(int cr, int bit);
};
};
+void save_fpu_regs(struct fpu *fpu);
+
#define is_vx_fpu(fpu) (!!((fpu)->flags & FPU_USE_VX))
#define is_vx_task(tsk) (!!((tsk)->thread.fpu.flags & FPU_USE_VX))
+/* VX array structure for address operand constraints in inline assemblies */
+struct vx_array { __vector128 _[__NUM_VXRS]; };
+
static inline int test_fp_ctl(u32 fpc)
{
u32 orig_fpc;
return rc;
}
-static inline void save_fp_ctl(u32 *fpc)
-{
- asm volatile(
- " stfpc %0\n"
- : "+Q" (*fpc));
-}
-
-static inline int restore_fp_ctl(u32 *fpc)
-{
- int rc;
-
- asm volatile(
- " lfpc %1\n"
- "0: la %0,0\n"
- "1:\n"
- : "=d" (rc) : "Q" (*fpc), "0" (-EINVAL));
- return rc;
-}
-
-static inline void save_fp_regs(freg_t *fprs)
-{
- asm volatile("std 0,%0" : "=Q" (fprs[0]));
- asm volatile("std 2,%0" : "=Q" (fprs[2]));
- asm volatile("std 4,%0" : "=Q" (fprs[4]));
- asm volatile("std 6,%0" : "=Q" (fprs[6]));
- asm volatile("std 1,%0" : "=Q" (fprs[1]));
- asm volatile("std 3,%0" : "=Q" (fprs[3]));
- asm volatile("std 5,%0" : "=Q" (fprs[5]));
- asm volatile("std 7,%0" : "=Q" (fprs[7]));
- asm volatile("std 8,%0" : "=Q" (fprs[8]));
- asm volatile("std 9,%0" : "=Q" (fprs[9]));
- asm volatile("std 10,%0" : "=Q" (fprs[10]));
- asm volatile("std 11,%0" : "=Q" (fprs[11]));
- asm volatile("std 12,%0" : "=Q" (fprs[12]));
- asm volatile("std 13,%0" : "=Q" (fprs[13]));
- asm volatile("std 14,%0" : "=Q" (fprs[14]));
- asm volatile("std 15,%0" : "=Q" (fprs[15]));
-}
-
-static inline void restore_fp_regs(freg_t *fprs)
-{
- asm volatile("ld 0,%0" : : "Q" (fprs[0]));
- asm volatile("ld 2,%0" : : "Q" (fprs[2]));
- asm volatile("ld 4,%0" : : "Q" (fprs[4]));
- asm volatile("ld 6,%0" : : "Q" (fprs[6]));
- asm volatile("ld 1,%0" : : "Q" (fprs[1]));
- asm volatile("ld 3,%0" : : "Q" (fprs[3]));
- asm volatile("ld 5,%0" : : "Q" (fprs[5]));
- asm volatile("ld 7,%0" : : "Q" (fprs[7]));
- asm volatile("ld 8,%0" : : "Q" (fprs[8]));
- asm volatile("ld 9,%0" : : "Q" (fprs[9]));
- asm volatile("ld 10,%0" : : "Q" (fprs[10]));
- asm volatile("ld 11,%0" : : "Q" (fprs[11]));
- asm volatile("ld 12,%0" : : "Q" (fprs[12]));
- asm volatile("ld 13,%0" : : "Q" (fprs[13]));
- asm volatile("ld 14,%0" : : "Q" (fprs[14]));
- asm volatile("ld 15,%0" : : "Q" (fprs[15]));
-}
-
-static inline void save_vx_regs(__vector128 *vxrs)
-{
- typedef struct { __vector128 _[__NUM_VXRS]; } addrtype;
-
- asm volatile(
- " la 1,%0\n"
- " .word 0xe70f,0x1000,0x003e\n" /* vstm 0,15,0(1) */
- " .word 0xe70f,0x1100,0x0c3e\n" /* vstm 16,31,256(1) */
- : "=Q" (*(addrtype *) vxrs) : : "1");
-}
-
static inline void save_vx_regs_safe(__vector128 *vxrs)
{
unsigned long cr0, flags;
__ctl_store(cr0, 0, 0);
__ctl_set_bit(0, 17);
__ctl_set_bit(0, 18);
- save_vx_regs(vxrs);
- __ctl_load(cr0, 0, 0);
- arch_local_irq_restore(flags);
-}
-
-static inline void restore_vx_regs(__vector128 *vxrs)
-{
- typedef struct { __vector128 _[__NUM_VXRS]; } addrtype;
-
asm volatile(
" 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" (*(addrtype *) vxrs) : "1");
+ " .word 0xe70f,0x1000,0x003e\n" /* vstm 0,15,0(1) */
+ " .word 0xe70f,0x1100,0x0c3e\n" /* vstm 16,31,256(1) */
+ : "=Q" (*(struct vx_array *) vxrs) : : "1");
+ __ctl_load(cr0, 0, 0);
+ arch_local_irq_restore(flags);
}
static inline void convert_vx_to_fp(freg_t *fprs, __vector128 *vxrs)
sizeof(fpregs->fprs));
}
-static inline void save_fpu_regs(struct fpu *fpu)
-{
- save_fp_ctl(&fpu->fpc);
- if (is_vx_fpu(fpu))
- save_vx_regs(fpu->vxrs);
- else
- save_fp_regs(fpu->fprs);
-}
-
-static inline void restore_fpu_regs(struct fpu *fpu)
-{
- restore_fp_ctl(&fpu->fpc);
- if (is_vx_fpu(fpu))
- restore_vx_regs(fpu->vxrs);
- else
- restore_fp_regs(fpu->fprs);
-}
-
#endif
#endif /* _ASM_S390_FPU_INTERNAL_H */
#include <linux/kvm.h>
#include <asm/debug.h>
#include <asm/cpu.h>
+#include <asm/fpu-internal.h>
#include <asm/isc.h>
#define KVM_MAX_VCPUS 64
struct kvm_vcpu_arch {
struct kvm_s390_sie_block *sie_block;
- s390_fp_regs host_fpregs;
unsigned int host_acrs[NUM_ACRS];
- s390_fp_regs guest_fpregs;
- struct kvm_s390_vregs *host_vregs;
+ struct fpu host_fpregs;
+ struct fpu guest_fpregs;
struct kvm_s390_local_interrupt local_int;
struct hrtimer ckc_timer;
struct kvm_s390_pgm_info pgm;
#define CIF_MCCK_PENDING 0 /* machine check handling is pending */
#define CIF_ASCE 1 /* user asce needs fixup / uaccess */
#define CIF_NOHZ_DELAY 2 /* delay HZ disable for a tick */
+#define CIF_FPU 3 /* restore vector registers */
#define _CIF_MCCK_PENDING (1<<CIF_MCCK_PENDING)
#define _CIF_ASCE (1<<CIF_ASCE)
#define _CIF_NOHZ_DELAY (1<<CIF_NOHZ_DELAY)
+#define _CIF_FPU (1<<CIF_FPU)
#ifndef __ASSEMBLY__
} \
if (next->mm) { \
update_cr_regs(next); \
- restore_fpu_regs(&next->thread.fpu); \
+ set_cpu_flag(CIF_FPU); \
restore_access_regs(&next->thread.acrs[0]); \
restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \
} \
DEFINE(__TASK_pid, offsetof(struct task_struct, pid));
BLANK();
DEFINE(__THREAD_ksp, offsetof(struct thread_struct, ksp));
+ DEFINE(__THREAD_fpu, offsetof(struct task_struct, thread.fpu));
DEFINE(__THREAD_per_cause, offsetof(struct thread_struct, per_event.cause));
DEFINE(__THREAD_per_address, offsetof(struct thread_struct, per_event.address));
DEFINE(__THREAD_per_paid, offsetof(struct thread_struct, per_event.paid));
DEFINE(__THREAD_trap_tdb, offsetof(struct thread_struct, trap_tdb));
BLANK();
+ DEFINE(__FPU_fpc, offsetof(struct fpu, fpc));
+ DEFINE(__FPU_flags, offsetof(struct fpu, flags));
+ DEFINE(__FPU_regs, offsetof(struct fpu, regs));
+ BLANK();
DEFINE(__TI_task, offsetof(struct thread_info, task));
DEFINE(__TI_flags, offsetof(struct thread_info, flags));
DEFINE(__TI_sysc_table, offsetof(struct thread_info, sys_call_table));
static void load_sigregs(void)
{
restore_access_regs(current->thread.acrs);
- restore_fpu_regs(¤t->thread.fpu);
}
static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32))
goto badframe;
set_current_blocked(&set);
+ save_fpu_regs(¤t->thread.fpu);
if (restore_sigregs32(regs, &frame->sregs))
goto badframe;
if (restore_sigregs_ext32(regs, &frame->sregs_ext))
set_current_blocked(&set);
if (compat_restore_altstack(&frame->uc.uc_stack))
goto badframe;
+ save_fpu_regs(¤t->thread.fpu);
if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
goto badframe;
if (restore_sigregs_ext32(regs, &frame->uc.uc_mcontext_ext))
#include <asm/page.h>
#include <asm/sigp.h>
#include <asm/irq.h>
+#include <asm/fpu-internal.h>
+#include <asm/vx-insn.h>
__PT_R0 = __PT_GPRS
__PT_R1 = __PT_GPRS + 8
_TIF_UPROBE)
_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
_TIF_SYSCALL_TRACEPOINT)
-_CIF_WORK = (_CIF_MCCK_PENDING | _CIF_ASCE)
+_CIF_WORK = (_CIF_MCCK_PENDING | _CIF_ASCE | _CIF_FPU)
_PIF_WORK = (_PIF_PER_TRAP)
-#define BASED(name) name-system_call(%r13)
+#define BASED(name) name-cleanup_critical(%r13)
.macro TRACE_IRQS_ON
#ifdef CONFIG_TRACE_IRQFLAGS
jo .Lsysc_sigpending
tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
jo .Lsysc_notify_resume
+ tm __LC_CPU_FLAGS+7,_CIF_FPU
+ jo .Lsysc_vxrs
tm __LC_CPU_FLAGS+7,_CIF_ASCE
jo .Lsysc_uaccess
j .Lsysc_return # beware of critical section cleanup
j .Lsysc_return
#
+# CIF_FPU is set, restore floating-point controls and floating-point registers.
+#
+.Lsysc_vxrs:
+ larl %r14,.Lsysc_return
+ jg load_fpu_regs
+
+#
# _TIF_SIGPENDING is set, call do_signal
#
.Lsysc_sigpending:
stmg %r8,%r15,__LC_SAVE_AREA_SYNC
lg %r10,__LC_LAST_BREAK
lg %r12,__LC_THREAD_INFO
- larl %r13,system_call
+ larl %r13,cleanup_critical
lmg %r8,%r9,__LC_PGM_OLD_PSW
HANDLE_SIE_INTERCEPT %r14,1
tmhh %r8,0x0001 # test problem state bit
stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
lg %r10,__LC_LAST_BREAK
lg %r12,__LC_THREAD_INFO
- larl %r13,system_call
+ larl %r13,cleanup_critical
lmg %r8,%r9,__LC_IO_OLD_PSW
HANDLE_SIE_INTERCEPT %r14,2
SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
jo .Lio_sigpending
tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
jo .Lio_notify_resume
+ tm __LC_CPU_FLAGS+7,_CIF_FPU
+ jo .Lio_vxrs
tm __LC_CPU_FLAGS+7,_CIF_ASCE
jo .Lio_uaccess
j .Lio_return # beware of critical section cleanup
j .Lio_return
#
+# CIF_FPU is set, restore floating-point controls and floating-point registers.
+#
+.Lio_vxrs:
+ larl %r14,.Lio_return
+ jg load_fpu_regs
+
+#
# _TIF_NEED_RESCHED is set, call schedule
#
.Lio_reschedule:
stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
lg %r10,__LC_LAST_BREAK
lg %r12,__LC_THREAD_INFO
- larl %r13,system_call
+ larl %r13,cleanup_critical
lmg %r8,%r9,__LC_EXT_OLD_PSW
HANDLE_SIE_INTERCEPT %r14,3
SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
br %r14
.Lpsw_idle_end:
+/* Store floating-point controls and floating-point or vector extension
+ * registers instead. A critical section cleanup assures that the registers
+ * are stored even if interrupted for some other work. The register %r2
+ * designates a struct fpu to store register contents. If the specified
+ * structure does not contain a register save area, the register store is
+ * omitted (see also comments in arch_dup_task_struct()).
+ *
+ * The CIF_FPU flag is set in any case. The CIF_FPU triggers a lazy restore
+ * of the register contents at system call or io return.
+ */
+ENTRY(save_fpu_regs)
+ tm __LC_CPU_FLAGS+7,_CIF_FPU
+ bor %r14
+ stfpc __FPU_fpc(%r2)
+.Lsave_fpu_regs_fpc_end:
+ lg %r3,__FPU_regs(%r2)
+ ltgr %r3,%r3
+ jz .Lsave_fpu_regs_done # no save area -> set CIF_FPU
+ tm __FPU_flags+3(%r2),FPU_USE_VX
+ jz .Lsave_fpu_regs_fp # no -> store FP regs
+.Lsave_fpu_regs_vx_low:
+ VSTM %v0,%v15,0,%r3 # vstm 0,15,0(3)
+.Lsave_fpu_regs_vx_high:
+ VSTM %v16,%v31,256,%r3 # vstm 16,31,256(3)
+ j .Lsave_fpu_regs_done # -> set CIF_FPU flag
+.Lsave_fpu_regs_fp:
+ std 0,0(%r3)
+ std 1,8(%r3)
+ std 2,16(%r3)
+ std 3,24(%r3)
+ std 4,32(%r3)
+ std 5,40(%r3)
+ std 6,48(%r3)
+ std 7,56(%r3)
+ std 8,64(%r3)
+ std 9,72(%r3)
+ std 10,80(%r3)
+ std 11,88(%r3)
+ std 12,96(%r3)
+ std 13,104(%r3)
+ std 14,112(%r3)
+ std 15,120(%r3)
+.Lsave_fpu_regs_done:
+ oi __LC_CPU_FLAGS+7,_CIF_FPU
+ br %r14
+.Lsave_fpu_regs_end:
+
+/* Load floating-point controls and floating-point or vector extension
+ * registers. A critical section cleanup assures that the register contents
+ * are loaded even if interrupted for some other work. Depending on the saved
+ * FP/VX state, the vector-enablement control, CR0.46, is either set or cleared.
+ *
+ * There are special calling conventions to fit into sysc and io return work:
+ * %r12: __LC_THREAD_INFO
+ * %r15: <kernel stack>
+ * The function requires:
+ * %r4 and __SF_EMPTY+32(%r15)
+ */
+load_fpu_regs:
+ tm __LC_CPU_FLAGS+7,_CIF_FPU
+ bnor %r14
+ lg %r4,__TI_task(%r12)
+ la %r4,__THREAD_fpu(%r4)
+ lfpc __FPU_fpc(%r4)
+ stctg %c0,%c0,__SF_EMPTY+32(%r15) # store CR0
+ tm __FPU_flags+3(%r4),FPU_USE_VX # VX-enabled task ?
+ lg %r4,__FPU_regs(%r4) # %r4 <- reg save area
+ jz .Lload_fpu_regs_fp_ctl # -> no VX, load FP regs
+.Lload_fpu_regs_vx_ctl:
+ tm __SF_EMPTY+32+5(%r15),2 # test VX control
+ jo .Lload_fpu_regs_vx
+ oi __SF_EMPTY+32+5(%r15),2 # set VX control
+ lctlg %c0,%c0,__SF_EMPTY+32(%r15)
+.Lload_fpu_regs_vx:
+ VLM %v0,%v15,0,%r4
+.Lload_fpu_regs_vx_high:
+ VLM %v16,%v31,256,%r4
+ j .Lload_fpu_regs_done
+.Lload_fpu_regs_fp_ctl:
+ tm __SF_EMPTY+32+5(%r15),2 # test VX control
+ jz .Lload_fpu_regs_fp
+ ni __SF_EMPTY+32+5(%r15),253 # clear VX control
+ lctlg %c0,%c0,__SF_EMPTY+32(%r15)
+.Lload_fpu_regs_fp:
+ ld 0,0(%r4)
+ ld 1,8(%r4)
+ ld 2,16(%r4)
+ ld 3,24(%r4)
+ ld 4,32(%r4)
+ ld 5,40(%r4)
+ ld 6,48(%r4)
+ ld 7,56(%r4)
+ ld 8,64(%r4)
+ ld 9,72(%r4)
+ ld 10,80(%r4)
+ ld 11,88(%r4)
+ ld 12,96(%r4)
+ ld 13,104(%r4)
+ ld 14,112(%r4)
+ ld 15,120(%r4)
+.Lload_fpu_regs_done:
+ ni __LC_CPU_FLAGS+7,255-_CIF_FPU
+ br %r14
+.Lload_fpu_regs_end:
+
+/* Test and set the vector enablement control in CR0.46 */
+ENTRY(__ctl_set_vx)
+ stctg %c0,%c0,__SF_EMPTY(%r15)
+ tm __SF_EMPTY+5(%r15),2
+ bor %r14
+ oi __SF_EMPTY+5(%r15),2
+ lctlg %c0,%c0,__SF_EMPTY(%r15)
+ br %r14
+.L__ctl_set_vx_end:
+
.L__critical_end:
/*
lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
lg %r10,__LC_LAST_BREAK
lg %r12,__LC_THREAD_INFO
- larl %r13,system_call
+ larl %r13,cleanup_critical
lmg %r8,%r9,__LC_MCK_OLD_PSW
HANDLE_SIE_INTERCEPT %r14,4
tm __LC_MCCK_CODE,0x80 # system damage?
.quad .Lio_done
.quad psw_idle
.quad .Lpsw_idle_end
+ .quad save_fpu_regs
+ .quad .Lsave_fpu_regs_end
+ .quad load_fpu_regs
+ .quad .Lload_fpu_regs_end
+ .quad __ctl_set_vx
+ .quad .L__ctl_set_vx_end
cleanup_critical:
clg %r9,BASED(.Lcleanup_table) # system_call
jl 0f
clg %r9,BASED(.Lcleanup_table+72) # .Lpsw_idle_end
jl .Lcleanup_idle
+ clg %r9,BASED(.Lcleanup_table+80) # save_fpu_regs
+ jl 0f
+ clg %r9,BASED(.Lcleanup_table+88) # .Lsave_fpu_regs_end
+ jl .Lcleanup_save_fpu_regs
+ clg %r9,BASED(.Lcleanup_table+96) # load_fpu_regs
+ jl 0f
+ clg %r9,BASED(.Lcleanup_table+104) # .Lload_fpu_regs_end
+ jl .Lcleanup_load_fpu_regs
+ clg %r9,BASED(.Lcleanup_table+112) # __ctl_set_vx
+ jl 0f
+ clg %r9,BASED(.Lcleanup_table+120) # .L__ctl_set_vx_end
+ jl .Lcleanup___ctl_set_vx
0: br %r14
.Lcleanup_idle_insn:
.quad .Lpsw_idle_lpsw
+.Lcleanup_save_fpu_regs:
+ tm __LC_CPU_FLAGS+7,_CIF_FPU
+ bor %r14
+ clg %r9,BASED(.Lcleanup_save_fpu_regs_done)
+ jhe 5f
+ clg %r9,BASED(.Lcleanup_save_fpu_regs_fp)
+ jhe 4f
+ clg %r9,BASED(.Lcleanup_save_fpu_regs_vx_high)
+ jhe 3f
+ clg %r9,BASED(.Lcleanup_save_fpu_regs_vx_low)
+ jhe 2f
+ clg %r9,BASED(.Lcleanup_save_fpu_fpc_end)
+ jhe 1f
+0: # Store floating-point controls
+ stfpc __FPU_fpc(%r2)
+1: # Load register save area and check if VX is active
+ lg %r3,__FPU_regs(%r2)
+ ltgr %r3,%r3
+ jz 5f # no save area -> set CIF_FPU
+ tm __FPU_flags+3(%r2),FPU_USE_VX
+ jz 4f # no VX -> store FP regs
+2: # Store vector registers (V0-V15)
+ VSTM %v0,%v15,0,%r3 # vstm 0,15,0(3)
+3: # Store vector registers (V16-V31)
+ VSTM %v16,%v31,256,%r3 # vstm 16,31,256(3)
+ j 5f # -> done, set CIF_FPU flag
+4: # Store floating-point registers
+ std 0,0(%r3)
+ std 1,8(%r3)
+ std 2,16(%r3)
+ std 3,24(%r3)
+ std 4,32(%r3)
+ std 5,40(%r3)
+ std 6,48(%r3)
+ std 7,56(%r3)
+ std 8,64(%r3)
+ std 9,72(%r3)
+ std 10,80(%r3)
+ std 11,88(%r3)
+ std 12,96(%r3)
+ std 13,104(%r3)
+ std 14,112(%r3)
+ std 15,120(%r3)
+5: # Set CIF_FPU flag
+ oi __LC_CPU_FLAGS+7,_CIF_FPU
+ lg %r9,48(%r11) # return from save_fpu_regs
+ br %r14
+.Lcleanup_save_fpu_fpc_end:
+ .quad .Lsave_fpu_regs_fpc_end
+.Lcleanup_save_fpu_regs_vx_low:
+ .quad .Lsave_fpu_regs_vx_low
+.Lcleanup_save_fpu_regs_vx_high:
+ .quad .Lsave_fpu_regs_vx_high
+.Lcleanup_save_fpu_regs_fp:
+ .quad .Lsave_fpu_regs_fp
+.Lcleanup_save_fpu_regs_done:
+ .quad .Lsave_fpu_regs_done
+
+.Lcleanup_load_fpu_regs:
+ tm __LC_CPU_FLAGS+7,_CIF_FPU
+ bnor %r14
+ clg %r9,BASED(.Lcleanup_load_fpu_regs_done)
+ jhe 1f
+ clg %r9,BASED(.Lcleanup_load_fpu_regs_fp)
+ jhe 2f
+ clg %r9,BASED(.Lcleanup_load_fpu_regs_fp_ctl)
+ jhe 3f
+ clg %r9,BASED(.Lcleanup_load_fpu_regs_vx_high)
+ jhe 4f
+ clg %r9,BASED(.Lcleanup_load_fpu_regs_vx)
+ jhe 5f
+ clg %r9,BASED(.Lcleanup_load_fpu_regs_vx_ctl)
+ jhe 6f
+ lg %r4,__TI_task(%r12)
+ la %r4,__THREAD_fpu(%r4)
+ lfpc __FPU_fpc(%r4)
+ tm __FPU_flags+3(%r4),FPU_USE_VX # VX-enabled task ?
+ lg %r4,__FPU_regs(%r4) # %r4 <- reg save area
+ jz 3f # -> no VX, load FP regs
+6: # Set VX-enablement control
+ stctg %c0,%c0,__SF_EMPTY+32(%r15) # store CR0
+ tm __SF_EMPTY+32+5(%r15),2 # test VX control
+ jo 5f
+ oi __SF_EMPTY+32+5(%r15),2 # set VX control
+ lctlg %c0,%c0,__SF_EMPTY+32(%r15)
+5: # Load V0 ..V15 registers
+ VLM %v0,%v15,0,%r4
+4: # Load V16..V31 registers
+ VLM %v16,%v31,256,%r4
+ j 1f
+3: # Clear VX-enablement control for FP
+ stctg %c0,%c0,__SF_EMPTY+32(%r15) # store CR0
+ tm __SF_EMPTY+32+5(%r15),2 # test VX control
+ jz 2f
+ ni __SF_EMPTY+32+5(%r15),253 # clear VX control
+ lctlg %c0,%c0,__SF_EMPTY+32(%r15)
+2: # Load floating-point registers
+ ld 0,0(%r4)
+ ld 1,8(%r4)
+ ld 2,16(%r4)
+ ld 3,24(%r4)
+ ld 4,32(%r4)
+ ld 5,40(%r4)
+ ld 6,48(%r4)
+ ld 7,56(%r4)
+ ld 8,64(%r4)
+ ld 9,72(%r4)
+ ld 10,80(%r4)
+ ld 11,88(%r4)
+ ld 12,96(%r4)
+ ld 13,104(%r4)
+ ld 14,112(%r4)
+ ld 15,120(%r4)
+1: # Clear CIF_FPU bit
+ ni __LC_CPU_FLAGS+7,255-_CIF_FPU
+ lg %r9,48(%r11) # return from load_fpu_regs
+ br %r14
+.Lcleanup_load_fpu_regs_vx_ctl:
+ .quad .Lload_fpu_regs_vx_ctl
+.Lcleanup_load_fpu_regs_vx:
+ .quad .Lload_fpu_regs_vx
+.Lcleanup_load_fpu_regs_vx_high:
+ .quad .Lload_fpu_regs_vx_high
+.Lcleanup_load_fpu_regs_fp_ctl:
+ .quad .Lload_fpu_regs_fp_ctl
+.Lcleanup_load_fpu_regs_fp:
+ .quad .Lload_fpu_regs_fp
+.Lcleanup_load_fpu_regs_done:
+ .quad .Lload_fpu_regs_done
+
+.Lcleanup___ctl_set_vx:
+ stctg %c0,%c0,__SF_EMPTY(%r15)
+ tm __SF_EMPTY+5(%r15),2
+ bor %r14
+ oi __SF_EMPTY+5(%r15),2
+ lctlg %c0,%c0,__SF_EMPTY(%r15)
+ lg %r9,48(%r11) # return from __ctl_set_vx
+ br %r14
+
/*
* Integer constants
*/
stg %r2,__SF_EMPTY(%r15) # save control block pointer
stg %r3,__SF_EMPTY+8(%r15) # save guest register save area
xc __SF_EMPTY+16(16,%r15),__SF_EMPTY+16(%r15) # host id & reason
+ tm __LC_CPU_FLAGS+7,_CIF_FPU # load guest fp/vx registers ?
+ jno .Lsie_load_guest_gprs
+ lg %r12,__LC_THREAD_INFO # load fp/vx regs save area
+ brasl %r14,load_fpu_regs # load guest fp/vx regs
+.Lsie_load_guest_gprs:
lmg %r0,%r13,0(%r3) # load guest gprs 0-13
lg %r14,__LC_GMAP # get gmap pointer
ltgr %r14,%r14
oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now
tm __SIE_PROG20+3(%r14),3 # last exit...
jnz .Lsie_done
+ tm __LC_CPU_FLAGS+7,_CIF_FPU
+ jo .Lsie_done # exit if fp/vx regs changed
LPP __SF_EMPTY(%r15) # set guest id
sie 0(%r14)
.Lsie_done:
cr0.val = S390_lowcore.cregs_save_area[0];
cr0.afp = cr0.vx = 1;
__ctl_load(cr0.val, 0, 0);
- restore_vx_regs((__vector128 *)
- &S390_lowcore.vector_save_area);
+ asm volatile(
+ " 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");
__ctl_load(S390_lowcore.cregs_save_area[0], 0, 0);
}
/* Revalidate access registers */
*dst = *src;
/* Set up a new floating-point register save area */
+ dst->thread.fpu.fpc = 0;
+ dst->thread.fpu.flags = 0; /* Always start with VX disabled */
dst->thread.fpu.fprs = kzalloc(sizeof(freg_t) * __NUM_FPRS,
GFP_KERNEL|__GFP_REPEAT);
if (!dst->thread.fpu.fprs)
return -ENOMEM;
- /* Save the fpu registers to new thread structure. */
- save_fp_ctl(&dst->thread.fpu.fpc);
- save_fp_regs(dst->thread.fpu.fprs);
- dst->thread.fpu.flags = 0; /* Always start with VX disabled */
-
+ /*
+ * Save the floating-point or vector register state of the current
+ * task. The state is not saved for early kernel threads, for example,
+ * the init_task, which do not have an allocated save area.
+ * The CIF_FPU flag is set in any case to lazy clear or restore a saved
+ * state when switching to a different task or returning to user space.
+ */
+ save_fpu_regs(¤t->thread.fpu);
+ dst->thread.fpu.fpc = current->thread.fpu.fpc;
+ if (is_vx_task(current))
+ convert_vx_to_fp(dst->thread.fpu.fprs,
+ current->thread.fpu.vxrs);
+ else
+ memcpy(dst->thread.fpu.fprs, current->thread.fpu.fprs,
+ sizeof(freg_t) * __NUM_FPRS);
return 0;
}
*/
int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs)
{
- save_fp_ctl(&fpregs->fpc);
- save_fp_regs(fpregs->fprs);
+ save_fpu_regs(¤t->thread.fpu);
+ fpregs->fpc = current->thread.fpu.fpc;
+ fpregs->pad = 0;
+ if (is_vx_task(current))
+ convert_vx_to_fp((freg_t *)&fpregs->fprs,
+ current->thread.fpu.vxrs);
+ else
+ memcpy(&fpregs->fprs, current->thread.fpu.fprs,
+ sizeof(fpregs->fprs));
return 1;
}
EXPORT_SYMBOL(dump_fpu);
struct per_regs old, new;
/* Take care of the enable/disable of transactional execution. */
- if (MACHINE_HAS_TE || MACHINE_HAS_VX) {
+ if (MACHINE_HAS_TE) {
unsigned long cr, cr_new;
__ctl_store(cr, 0, 0);
- cr_new = cr;
- if (MACHINE_HAS_TE) {
- /* Set or clear transaction execution TXC bit 8. */
- cr_new |= (1UL << 55);
- if (task->thread.per_flags & PER_FLAG_NO_TE)
- cr_new &= ~(1UL << 55);
- }
- if (MACHINE_HAS_VX) {
- /* Enable/disable of vector extension */
- cr_new &= ~(1UL << 17);
- if (task->thread.fpu.vxrs)
- cr_new |= (1UL << 17);
- }
+ /* Set or clear transaction execution TXC bit 8. */
+ cr_new = cr | (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);
- if (MACHINE_HAS_TE) {
- /* Set/clear transaction execution TDC bits 62/63. */
- __ctl_store(cr, 2, 2);
- cr_new = cr & ~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;
- else
- cr_new |= 2UL;
- }
- if (cr_new != cr)
- __ctl_load(cr_new, 2, 2);
+ /* Set or clear transaction execution TDC bits 62 and 63. */
+ __ctl_store(cr, 2, 2);
+ cr_new = cr & ~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;
+ else
+ cr_new |= 2UL;
}
+ if (cr_new != cr)
+ __ctl_load(cr_new, 2, 2);
}
/* Copy user specified PER registers */
new.control = thread->per_user.control;
else
memcpy(target->thread.fpu.fprs, &fprs, sizeof(fprs));
- if (target == current)
- restore_fpu_regs(&target->thread.fpu);
-
return rc;
}
save_fpu_regs(&target->thread.fpu);
rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
- if (rc == 0) {
+ if (rc == 0)
for (i = 0; i < __NUM_VXRS_LOW; i++)
*((__u64 *)(target->thread.fpu.vxrs + i) + 1) = vxrs[i];
- if (target == current)
- restore_fpu_regs(&target->thread.fpu);
- }
return rc;
}
rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
target->thread.fpu.vxrs + __NUM_VXRS_LOW, 0, -1);
- if (rc == 0 && target == current)
- restore_vx_regs(target->thread.fpu.vxrs);
-
return rc;
}
#include <linux/module.h>
#include <linux/kvm_host.h>
+#include <asm/fpu-internal.h>
#include <asm/ftrace.h>
#ifdef CONFIG_FUNCTION_TRACER
#if IS_ENABLED(CONFIG_KVM)
EXPORT_SYMBOL(sie64a);
EXPORT_SYMBOL(sie_exit);
+EXPORT_SYMBOL(save_fpu_regs);
+EXPORT_SYMBOL(__ctl_set_vx);
#endif
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(memset);
static void load_sigregs(void)
{
restore_access_regs(current->thread.acrs);
- restore_fpu_regs(¤t->thread.fpu);
}
/* Returns non-zero on fault. */
if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE))
goto badframe;
set_current_blocked(&set);
+ save_fpu_regs(¤t->thread.fpu);
if (restore_sigregs(regs, &frame->sregs))
goto badframe;
if (restore_sigregs_ext(regs, &frame->sregs_ext))
set_current_blocked(&set);
if (restore_altstack(&frame->uc.uc_stack))
goto badframe;
+ save_fpu_regs(¤t->thread.fpu);
if (restore_sigregs(regs, &frame->uc.uc_mcontext))
goto badframe;
if (restore_sigregs_ext(regs, &frame->uc.uc_mcontext_ext))
DO_ERROR_INFO(transaction_exception, SIGILL, ILL_ILLOPN,
"transaction constraint exception")
-static inline void do_fp_trap(struct pt_regs *regs, int fpc)
+static inline void do_fp_trap(struct pt_regs *regs, __u32 fpc)
{
int si_code = 0;
/* FPC[2] is Data Exception Code */
return -ENOMEM;
preempt_disable();
if (tsk == current)
- save_fp_regs(tsk->thread.fpu.fprs);
+ save_fpu_regs(&tsk->thread.fpu);
/* Copy the 16 floating point registers */
convert_fp_to_vx(vxrs, tsk->thread.fpu.fprs);
fprs = tsk->thread.fpu.fprs;
tsk->thread.fpu.vxrs = vxrs;
tsk->thread.fpu.flags |= FPU_USE_VX;
kfree(fprs);
- if (tsk == current) {
- __ctl_set_bit(0, 17);
- restore_vx_regs(vxrs);
- }
preempt_enable();
return 0;
}
}
/* get vector interrupt code from fpc */
- asm volatile("stfpc %0" : "=Q" (current->thread.fpu.fpc));
+ save_fpu_regs(¤t->thread.fpu);
vic = (current->thread.fpu.fpc & 0xf00) >> 8;
switch (vic) {
case 1: /* invalid vector operation */
location = get_trap_ip(regs);
- asm volatile("stfpc %0" : "=Q" (current->thread.fpu.fpc));
+ save_fpu_regs(¤t->thread.fpu);
/* Check for vector register enablement */
if (MACHINE_HAS_VX && !is_vx_task(current) &&
(current->thread.fpu.fpc & FPC_DXC_MASK) == 0xfe00) {
return 0;
}
+/*
+ * Backs up the current FP/VX register save area on a particular
+ * destination. Used to switch between different register save
+ * areas.
+ */
+static inline void save_fpu_to(struct fpu *dst)
+{
+ dst->fpc = current->thread.fpu.fpc;
+ dst->flags = current->thread.fpu.flags;
+ dst->regs = current->thread.fpu.regs;
+}
+
+/*
+ * Switches the FP/VX register save area from which to lazy
+ * restore register contents.
+ */
+static inline void load_fpu_from(struct fpu *from)
+{
+ current->thread.fpu.fpc = from->fpc;
+ current->thread.fpu.flags = from->flags;
+ current->thread.fpu.regs = from->regs;
+}
+
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
- __u32 fpc;
+ /* Save host register state */
+ save_fpu_regs(¤t->thread.fpu);
+ save_fpu_to(&vcpu->arch.host_fpregs);
- save_fp_ctl(&vcpu->arch.host_fpregs.fpc);
- if (test_kvm_facility(vcpu->kvm, 129))
- save_vx_regs((__vector128 *)&vcpu->arch.host_vregs->vrs);
- else
- save_fp_regs(vcpu->arch.host_fpregs.fprs);
- save_access_regs(vcpu->arch.host_acrs);
if (test_kvm_facility(vcpu->kvm, 129)) {
- fpc = vcpu->run->s.regs.fpc;
- restore_vx_regs((__vector128 *)&vcpu->run->s.regs.vrs);
- } else {
- fpc = vcpu->arch.guest_fpregs.fpc;
- restore_fp_regs(vcpu->arch.guest_fpregs.fprs);
- }
- if (test_fp_ctl(fpc))
+ current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
+ current->thread.fpu.flags = FPU_USE_VX;
+ /*
+ * Use the register save area in the SIE-control block
+ * for register restore and save in kvm_arch_vcpu_put()
+ */
+ current->thread.fpu.vxrs =
+ (__vector128 *)&vcpu->run->s.regs.vrs;
+ /* Always enable the vector extension for KVM */
+ __ctl_set_vx();
+ } else
+ load_fpu_from(&vcpu->arch.guest_fpregs);
+
+ if (test_fp_ctl(current->thread.fpu.fpc))
/* User space provided an invalid FPC, let's clear it */
- fpc = 0;
- restore_fp_ctl(&fpc);
+ current->thread.fpu.fpc = 0;
+
+ save_access_regs(vcpu->arch.host_acrs);
restore_access_regs(vcpu->run->s.regs.acrs);
gmap_enable(vcpu->arch.gmap);
atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
{
atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
gmap_disable(vcpu->arch.gmap);
- if (test_kvm_facility(vcpu->kvm, 129)) {
- save_fp_ctl(&vcpu->run->s.regs.fpc);
- save_vx_regs((__vector128 *)&vcpu->run->s.regs.vrs);
- } else {
- save_fp_ctl(&vcpu->arch.guest_fpregs.fpc);
- save_fp_regs(vcpu->arch.guest_fpregs.fprs);
- }
- save_access_regs(vcpu->run->s.regs.acrs);
- restore_fp_ctl(&vcpu->arch.host_fpregs.fpc);
+
+ save_fpu_regs(¤t->thread.fpu);
+
if (test_kvm_facility(vcpu->kvm, 129))
- restore_vx_regs((__vector128 *)&vcpu->arch.host_vregs->vrs);
+ /*
+ * kvm_arch_vcpu_load() set up the register save area to
+ * the &vcpu->run->s.regs.vrs and, thus, the vector registers
+ * are already saved. Only the floating-point control must be
+ * copied.
+ */
+ vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
else
- restore_fp_regs(vcpu->arch.host_fpregs.fprs);
+ save_fpu_to(&vcpu->arch.guest_fpregs);
+ load_fpu_from(&vcpu->arch.host_fpregs);
+
+ save_access_regs(vcpu->run->s.regs.acrs);
restore_access_regs(vcpu->arch.host_acrs);
}
vcpu->arch.sie_block = &sie_page->sie_block;
vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
- vcpu->arch.host_vregs = &sie_page->vregs;
vcpu->arch.sie_block->icpua = id;
if (!kvm_is_ucontrol(kvm)) {
vcpu->arch.local_int.wq = &vcpu->wq;
vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
+ /*
+ * Allocate a save area for floating-point registers. If the vector
+ * extension is available, register contents are saved in the SIE
+ * control block. The allocated save area is still required in
+ * particular places, for example, in kvm_s390_vcpu_store_status().
+ */
+ vcpu->arch.guest_fpregs.fprs = kzalloc(sizeof(freg_t) * __NUM_FPRS,
+ GFP_KERNEL);
+ if (!vcpu->arch.guest_fpregs.fprs) {
+ rc = -ENOMEM;
+ goto out_free_sie_block;
+ }
+
rc = kvm_vcpu_init(vcpu, kvm, id);
if (rc)
goto out_free_sie_block;
{
if (test_fp_ctl(fpu->fpc))
return -EINVAL;
- memcpy(&vcpu->arch.guest_fpregs.fprs, &fpu->fprs, sizeof(fpu->fprs));
+ memcpy(vcpu->arch.guest_fpregs.fprs, &fpu->fprs, sizeof(fpu->fprs));
vcpu->arch.guest_fpregs.fpc = fpu->fpc;
- restore_fp_ctl(&vcpu->arch.guest_fpregs.fpc);
- restore_fp_regs(vcpu->arch.guest_fpregs.fprs);
+ save_fpu_regs(¤t->thread.fpu);
+ load_fpu_from(&vcpu->arch.guest_fpregs);
return 0;
}
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
- memcpy(&fpu->fprs, &vcpu->arch.guest_fpregs.fprs, sizeof(fpu->fprs));
+ memcpy(&fpu->fprs, vcpu->arch.guest_fpregs.fprs, sizeof(fpu->fprs));
fpu->fpc = vcpu->arch.guest_fpregs.fpc;
return 0;
}
* copying in vcpu load/put. Lets update our copies before we save
* it into the save area
*/
- save_fp_ctl(&vcpu->arch.guest_fpregs.fpc);
- save_fp_regs(vcpu->arch.guest_fpregs.fprs);
+ save_fpu_regs(¤t->thread.fpu);
+ if (test_kvm_facility(vcpu->kvm, 129)) {
+ /*
+ * If the vector extension is available, the vector registers
+ * which overlaps with floating-point registers are saved in
+ * the SIE-control block. Hence, extract the floating-point
+ * registers and the FPC value and store them in the
+ * guest_fpregs structure.
+ */
+ WARN_ON(!is_vx_task(current)); /* XXX remove later */
+ vcpu->arch.guest_fpregs.fpc = current->thread.fpu.fpc;
+ convert_vx_to_fp(vcpu->arch.guest_fpregs.fprs,
+ current->thread.fpu.vxrs);
+ } else
+ save_fpu_to(&vcpu->arch.guest_fpregs);
save_access_regs(vcpu->run->s.regs.acrs);
return kvm_s390_store_status_unloaded(vcpu, addr);
/*
* The guest VXRS are in the host VXRs due to the lazy
- * copying in vcpu load/put. Let's update our copies before we save
- * it into the save area.
+ * copying in vcpu load/put. We can simply call save_fpu_regs()
+ * to save the current register state because we are in the
+ * middle of a load/put cycle.
+ *
+ * Let's update our copies before we save it into the save area.
*/
- save_vx_regs((__vector128 *)&vcpu->run->s.regs.vrs);
+ save_fpu_regs(¤t->thread.fpu);
return kvm_s390_store_adtl_status_unloaded(vcpu, addr);
}
OSDN Git Service
