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-rw-r--r--arch/s390/include/asm/ctl_reg.h2
-rw-r--r--arch/s390/include/asm/fpu-internal.h14
-rw-r--r--arch/s390/kernel/asm-offsets.c1
-rw-r--r--arch/s390/kernel/compat_signal.c7
-rw-r--r--arch/s390/kernel/early.c12
-rw-r--r--arch/s390/kernel/entry.S102
-rw-r--r--arch/s390/kernel/entry.h2
-rw-r--r--arch/s390/kernel/process.c32
-rw-r--r--arch/s390/kernel/ptrace.c44
-rw-r--r--arch/s390/kernel/s390_ksyms.c1
-rw-r--r--arch/s390/kernel/signal.c7
-rw-r--r--arch/s390/kernel/traps.c39
-rw-r--r--arch/s390/kvm/kvm-s390.c6
13 files changed, 70 insertions, 199 deletions
diff --git a/arch/s390/include/asm/ctl_reg.h b/arch/s390/include/asm/ctl_reg.h
index 17a373576868..d7697ab802f6 100644
--- a/arch/s390/include/asm/ctl_reg.h
+++ b/arch/s390/include/asm/ctl_reg.h
@@ -46,8 +46,6 @@ static inline void __ctl_clear_bit(unsigned int cr, unsigned int bit)
__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);
diff --git a/arch/s390/include/asm/fpu-internal.h b/arch/s390/include/asm/fpu-internal.h
index 55dc2c0fb40a..cd79a3355b2a 100644
--- a/arch/s390/include/asm/fpu-internal.h
+++ b/arch/s390/include/asm/fpu-internal.h
@@ -8,10 +8,6 @@
#ifndef _ASM_S390_FPU_INTERNAL_H
#define _ASM_S390_FPU_INTERNAL_H
-#define FPU_USE_VX 1 /* Vector extension is active */
-
-#ifndef __ASSEMBLY__
-
#include <linux/errno.h>
#include <linux/string.h>
#include <asm/linkage.h>
@@ -20,7 +16,6 @@
struct fpu {
__u32 fpc; /* Floating-point control */
- __u32 flags;
union {
void *regs;
freg_t *fprs; /* Floating-point register save area */
@@ -30,9 +25,6 @@ struct fpu {
void save_fpu_regs(void);
-#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]; };
@@ -89,7 +81,7 @@ static inline void convert_fp_to_vx(__vector128 *vxrs, freg_t *fprs)
static inline void fpregs_store(_s390_fp_regs *fpregs, struct fpu *fpu)
{
fpregs->pad = 0;
- if (is_vx_fpu(fpu))
+ if (MACHINE_HAS_VX)
convert_vx_to_fp((freg_t *)&fpregs->fprs, fpu->vxrs);
else
memcpy((freg_t *)&fpregs->fprs, fpu->fprs,
@@ -98,13 +90,11 @@ static inline void fpregs_store(_s390_fp_regs *fpregs, struct fpu *fpu)
static inline void fpregs_load(_s390_fp_regs *fpregs, struct fpu *fpu)
{
- if (is_vx_fpu(fpu))
+ if (MACHINE_HAS_VX)
convert_fp_to_vx(fpu->vxrs, (freg_t *)&fpregs->fprs);
else
memcpy(fpu->fprs, (freg_t *)&fpregs->fprs,
sizeof(fpregs->fprs));
}
-#endif
-
#endif /* _ASM_S390_FPU_INTERNAL_H */
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index 3aeeb1b562c0..f77834a498a9 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -29,7 +29,6 @@ int main(void)
BLANK();
DEFINE(__THREAD_ksp, offsetof(struct thread_struct, ksp));
DEFINE(__THREAD_FPU_fpc, offsetof(struct thread_struct, fpu.fpc));
- DEFINE(__THREAD_FPU_flags, offsetof(struct thread_struct, fpu.flags));
DEFINE(__THREAD_FPU_regs, offsetof(struct thread_struct, fpu.regs));
DEFINE(__THREAD_per_cause, offsetof(struct thread_struct, per_event.cause));
DEFINE(__THREAD_per_address, offsetof(struct thread_struct, per_event.address));
diff --git a/arch/s390/kernel/compat_signal.c b/arch/s390/kernel/compat_signal.c
index e0f9d270b30f..66c94417c0ba 100644
--- a/arch/s390/kernel/compat_signal.c
+++ b/arch/s390/kernel/compat_signal.c
@@ -249,7 +249,7 @@ static int save_sigregs_ext32(struct pt_regs *regs,
return -EFAULT;
/* Save vector registers to signal stack */
- if (is_vx_task(current)) {
+ if (MACHINE_HAS_VX) {
for (i = 0; i < __NUM_VXRS_LOW; i++)
vxrs[i] = *((__u64 *)(current->thread.fpu.vxrs + i) + 1);
if (__copy_to_user(&sregs_ext->vxrs_low, vxrs,
@@ -277,7 +277,7 @@ static int restore_sigregs_ext32(struct pt_regs *regs,
*(__u32 *)&regs->gprs[i] = gprs_high[i];
/* Restore vector registers from signal stack */
- if (is_vx_task(current)) {
+ if (MACHINE_HAS_VX) {
if (__copy_from_user(vxrs, &sregs_ext->vxrs_low,
sizeof(sregs_ext->vxrs_low)) ||
__copy_from_user(current->thread.fpu.vxrs + __NUM_VXRS_LOW,
@@ -470,8 +470,7 @@ static int setup_rt_frame32(struct ksignal *ksig, sigset_t *set,
*/
uc_flags = UC_GPRS_HIGH;
if (MACHINE_HAS_VX) {
- if (is_vx_task(current))
- uc_flags |= UC_VXRS;
+ uc_flags |= UC_VXRS;
} else
frame_size -= sizeof(frame->uc.uc_mcontext_ext.vxrs_low) +
sizeof(frame->uc.uc_mcontext_ext.vxrs_high);
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 311a2d6d48e4..3c31609df959 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -329,9 +329,19 @@ static __init void detect_machine_facilities(void)
S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
if (test_facility(51))
S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
- if (test_facility(129))
+ if (test_facility(129)) {
S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
+ __ctl_set_bit(0, 17);
+ }
+}
+
+static int __init disable_vector_extension(char *str)
+{
+ S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
+ __ctl_clear_bit(0, 17);
+ return 1;
}
+early_param("novx", disable_vector_extension);
static int __init cad_setup(char *str)
{
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 582fe44ab07c..b78babf9a417 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -20,7 +20,6 @@
#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
@@ -748,15 +747,12 @@ ENTRY(psw_idle)
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.
+/*
+ * Store floating-point controls and floating-point or vector register
+ * depending whether the vector facility is available. A critical section
+ * cleanup assures that the registers are stored even if interrupted for
+ * some other work. The CIF_FPU flag is set to trigger a lazy restore
+ * of the register contents at return from io or a system call.
*/
ENTRY(save_fpu_regs)
lg %r2,__LC_CURRENT
@@ -768,7 +764,7 @@ ENTRY(save_fpu_regs)
lg %r3,__THREAD_FPU_regs(%r2)
ltgr %r3,%r3
jz .Lsave_fpu_regs_done # no save area -> set CIF_FPU
- tm __THREAD_FPU_flags+3(%r2),FPU_USE_VX
+ tm __LC_MACHINE_FLAGS+5,4 # MACHINE_HAS_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)
@@ -797,15 +793,15 @@ ENTRY(save_fpu_regs)
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.
+/*
+ * Load floating-point controls and floating-point or vector registers.
+ * A critical section cleanup assures that the register contents are
+ * loaded even if interrupted for some other work.
*
* There are special calling conventions to fit into sysc and io return work:
* %r15: <kernel stack>
* The function requires:
- * %r4 and __SF_EMPTY+32(%r15)
+ * %r4
*/
load_fpu_regs:
lg %r4,__LC_CURRENT
@@ -813,25 +809,14 @@ load_fpu_regs:
tm __LC_CPU_FLAGS+7,_CIF_FPU
bnor %r14
lfpc __THREAD_FPU_fpc(%r4)
- stctg %c0,%c0,__SF_EMPTY+32(%r15) # store CR0
- tm __THREAD_FPU_flags+3(%r4),FPU_USE_VX # VX-enabled task ?
+ tm __LC_MACHINE_FLAGS+5,4 # MACHINE_HAS_VX
lg %r4,__THREAD_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)
+ jz .Lload_fpu_regs_fp # -> no VX, load FP regs
.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)
@@ -854,16 +839,6 @@ load_fpu_regs:
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:
/*
@@ -1019,10 +994,6 @@ cleanup_critical:
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
.align 8
@@ -1041,8 +1012,6 @@ cleanup_critical:
.quad .Lsave_fpu_regs_end
.quad load_fpu_regs
.quad .Lload_fpu_regs_end
- .quad __ctl_set_vx
- .quad .L__ctl_set_vx_end
#if IS_ENABLED(CONFIG_KVM)
.Lcleanup_table_sie:
@@ -1226,7 +1195,7 @@ cleanup_critical:
lg %r3,__THREAD_FPU_regs(%r2)
ltgr %r3,%r3
jz 5f # no save area -> set CIF_FPU
- tm __THREAD_FPU_flags+3(%r2),FPU_USE_VX
+ tm __LC_MACHINE_FLAGS+5,4 # MACHINE_HAS_VX
jz 4f # no VX -> store FP regs
2: # Store vector registers (V0-V15)
VSTM %v0,%v15,0,%r3 # vstm 0,15,0(3)
@@ -1272,37 +1241,21 @@ cleanup_critical:
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
+ jhe 3f
clg %r9,BASED(.Lcleanup_load_fpu_regs_vx)
- jhe 5f
- clg %r9,BASED(.Lcleanup_load_fpu_regs_vx_ctl)
- jhe 6f
+ jhe 4f
lg %r4,__LC_CURRENT
aghi %r4,__TASK_thread
lfpc __THREAD_FPU_fpc(%r4)
- tm __THREAD_FPU_flags+3(%r4),FPU_USE_VX # VX-enabled task ?
+ tm __LC_MACHINE_FLAGS+5,4 # MACHINE_HAS_VX
lg %r4,__THREAD_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
+ jz 2f # -> no VX, load FP regs
+4: # Load V0 ..V15 registers
VLM %v0,%v15,0,%r4
-4: # Load V16..V31 registers
+3: # 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)
@@ -1324,28 +1277,15 @@ cleanup_critical:
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
*/
diff --git a/arch/s390/kernel/entry.h b/arch/s390/kernel/entry.h
index 834df047d35f..3eecd0f7adb2 100644
--- a/arch/s390/kernel/entry.h
+++ b/arch/s390/kernel/entry.h
@@ -21,8 +21,6 @@ void psw_idle(struct s390_idle_data *, unsigned long);
asmlinkage long do_syscall_trace_enter(struct pt_regs *regs);
asmlinkage void do_syscall_trace_exit(struct pt_regs *regs);
-int alloc_vector_registers(struct task_struct *tsk);
-
void do_protection_exception(struct pt_regs *regs);
void do_dat_exception(struct pt_regs *regs);
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index f2dac9f0799d..b63787156a19 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -87,31 +87,29 @@ void arch_release_task_struct(struct task_struct *tsk)
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
+ size_t fpu_regs_size;
+
*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)
+ /*
+ * If the vector extension is available, it is enabled for all tasks,
+ * and, thus, the FPU register save area must be allocated accordingly.
+ */
+ fpu_regs_size = MACHINE_HAS_VX ? sizeof(__vector128) * __NUM_VXRS
+ : sizeof(freg_t) * __NUM_FPRS;
+ dst->thread.fpu.regs = kzalloc(fpu_regs_size, GFP_KERNEL|__GFP_REPEAT);
+ if (!dst->thread.fpu.regs)
return -ENOMEM;
/*
* 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.
+ * task and set the CIF_FPU flag to lazy restore the FPU register
+ * state when returning to user space.
*/
save_fpu_regs();
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);
+ memcpy(dst->thread.fpu.regs, current->thread.fpu.regs, fpu_regs_size);
+
return 0;
}
@@ -199,7 +197,7 @@ int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs)
save_fpu_regs();
fpregs->fpc = current->thread.fpu.fpc;
fpregs->pad = 0;
- if (is_vx_task(current))
+ if (MACHINE_HAS_VX)
convert_vx_to_fp((freg_t *)&fpregs->fprs,
current->thread.fpu.vxrs);
else
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 8b1c8e33f184..3ccd9008a4dc 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -239,7 +239,7 @@ static unsigned long __peek_user(struct task_struct *child, addr_t addr)
* or the child->thread.fpu.vxrs array
*/
offset = addr - (addr_t) &dummy->regs.fp_regs.fprs;
- if (is_vx_task(child))
+ if (MACHINE_HAS_VX)
tmp = *(addr_t *)
((addr_t) child->thread.fpu.vxrs + 2*offset);
else
@@ -383,7 +383,7 @@ static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
* or the child->thread.fpu.vxrs array
*/
offset = addr - (addr_t) &dummy->regs.fp_regs.fprs;
- if (is_vx_task(child))
+ if (MACHINE_HAS_VX)
*(addr_t *)((addr_t)
child->thread.fpu.vxrs + 2*offset) = data;
else
@@ -617,7 +617,7 @@ static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
* or the child->thread.fpu.vxrs array
*/
offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs;
- if (is_vx_task(child))
+ if (MACHINE_HAS_VX)
tmp = *(__u32 *)
((addr_t) child->thread.fpu.vxrs + 2*offset);
else
@@ -742,7 +742,7 @@ static int __poke_user_compat(struct task_struct *child,
* or the child->thread.fpu.vxrs array
*/
offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs;
- if (is_vx_task(child))
+ if (MACHINE_HAS_VX)
*(__u32 *)((addr_t)
child->thread.fpu.vxrs + 2*offset) = tmp;
else
@@ -981,7 +981,7 @@ static int s390_fpregs_set(struct task_struct *target,
if (rc)
return rc;
- if (is_vx_task(target))
+ if (MACHINE_HAS_VX)
convert_fp_to_vx(target->thread.fpu.vxrs, fprs);
else
memcpy(target->thread.fpu.fprs, &fprs, sizeof(fprs));
@@ -1047,13 +1047,10 @@ static int s390_vxrs_low_get(struct task_struct *target,
if (!MACHINE_HAS_VX)
return -ENODEV;
- if (is_vx_task(target)) {
- if (target == current)
- save_fpu_regs();
- for (i = 0; i < __NUM_VXRS_LOW; i++)
- vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1);
- } else
- memset(vxrs, 0, sizeof(vxrs));
+ if (target == current)
+ save_fpu_regs();
+ for (i = 0; i < __NUM_VXRS_LOW; i++)
+ vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1);
return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
}
@@ -1067,11 +1064,7 @@ static int s390_vxrs_low_set(struct task_struct *target,
if (!MACHINE_HAS_VX)
return -ENODEV;
- if (!is_vx_task(target)) {
- rc = alloc_vector_registers(target);
- if (rc)
- return rc;
- } else if (target == current)
+ if (target == current)
save_fpu_regs();
rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
@@ -1091,13 +1084,10 @@ static int s390_vxrs_high_get(struct task_struct *target,
if (!MACHINE_HAS_VX)
return -ENODEV;
- if (is_vx_task(target)) {
- if (target == current)
- save_fpu_regs();
- memcpy(vxrs, target->thread.fpu.vxrs + __NUM_VXRS_LOW,
- sizeof(vxrs));
- } else
- memset(vxrs, 0, sizeof(vxrs));
+ if (target == current)
+ save_fpu_regs();
+ memcpy(vxrs, target->thread.fpu.vxrs + __NUM_VXRS_LOW, sizeof(vxrs));
+
return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
}
@@ -1110,11 +1100,7 @@ static int s390_vxrs_high_set(struct task_struct *target,
if (!MACHINE_HAS_VX)
return -ENODEV;
- if (!is_vx_task(target)) {
- rc = alloc_vector_registers(target);
- if (rc)
- return rc;
- } else if (target == current)
+ if (target == current)
save_fpu_regs();
rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
diff --git a/arch/s390/kernel/s390_ksyms.c b/arch/s390/kernel/s390_ksyms.c
index 5090d3dad10b..d9325b760596 100644
--- a/arch/s390/kernel/s390_ksyms.c
+++ b/arch/s390/kernel/s390_ksyms.c
@@ -10,7 +10,6 @@ EXPORT_SYMBOL(_mcount);
EXPORT_SYMBOL(sie64a);
EXPORT_SYMBOL(sie_exit);
EXPORT_SYMBOL(save_fpu_regs);
-EXPORT_SYMBOL(__ctl_set_vx);
#endif
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(memset);
diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c
index 9549af102d75..028cc46cb82a 100644
--- a/arch/s390/kernel/signal.c
+++ b/arch/s390/kernel/signal.c
@@ -179,7 +179,7 @@ static int save_sigregs_ext(struct pt_regs *regs,
int i;
/* Save vector registers to signal stack */
- if (is_vx_task(current)) {
+ if (MACHINE_HAS_VX) {
for (i = 0; i < __NUM_VXRS_LOW; i++)
vxrs[i] = *((__u64 *)(current->thread.fpu.vxrs + i) + 1);
if (__copy_to_user(&sregs_ext->vxrs_low, vxrs,
@@ -199,7 +199,7 @@ static int restore_sigregs_ext(struct pt_regs *regs,
int i;
/* Restore vector registers from signal stack */
- if (is_vx_task(current)) {
+ if (MACHINE_HAS_VX) {
if (__copy_from_user(vxrs, &sregs_ext->vxrs_low,
sizeof(sregs_ext->vxrs_low)) ||
__copy_from_user(current->thread.fpu.vxrs + __NUM_VXRS_LOW,
@@ -381,8 +381,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
uc_flags = 0;
if (MACHINE_HAS_VX) {
frame_size += sizeof(_sigregs_ext);
- if (is_vx_task(current))
- uc_flags |= UC_VXRS;
+ uc_flags |= UC_VXRS;
}
frame = get_sigframe(&ksig->ka, regs, frame_size);
if (frame == (void __user *) -1UL)
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 9861613fb35a..d9c45318f19b 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -224,29 +224,6 @@ NOKPROBE_SYMBOL(illegal_op);
DO_ERROR_INFO(specification_exception, SIGILL, ILL_ILLOPN,
"specification exception");
-int alloc_vector_registers(struct task_struct *tsk)
-{
- __vector128 *vxrs;
- freg_t *fprs;
-
- /* Allocate vector register save area. */
- vxrs = kzalloc(sizeof(__vector128) * __NUM_VXRS,
- GFP_KERNEL|__GFP_REPEAT);
- if (!vxrs)
- return -ENOMEM;
- preempt_disable();
- if (tsk == current)
- save_fpu_regs();
- /* 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);
- preempt_enable();
- return 0;
-}
-
void vector_exception(struct pt_regs *regs)
{
int si_code, vic;
@@ -281,13 +258,6 @@ void vector_exception(struct pt_regs *regs)
do_trap(regs, SIGFPE, si_code, "vector exception");
}
-static int __init disable_vector_extension(char *str)
-{
- S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
- return 1;
-}
-__setup("novx", disable_vector_extension);
-
void data_exception(struct pt_regs *regs)
{
__u16 __user *location;
@@ -296,15 +266,6 @@ void data_exception(struct pt_regs *regs)
location = get_trap_ip(regs);
save_fpu_regs();
- /* Check for vector register enablement */
- if (MACHINE_HAS_VX && !is_vx_task(current) &&
- (current->thread.fpu.fpc & FPC_DXC_MASK) == 0xfe00) {
- alloc_vector_registers(current);
- /* Vector data exception is suppressing, rewind psw. */
- regs->psw.addr = __rewind_psw(regs->psw, regs->int_code >> 16);
- clear_pt_regs_flag(regs, PIF_PER_TRAP);
- return;
- }
if (current->thread.fpu.fpc & FPC_DXC_MASK)
signal = SIGFPE;
else
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 0a67c40eece9..c6b4063fce29 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -1292,7 +1292,6 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
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;
}
@@ -1303,7 +1302,6 @@ static inline void save_fpu_to(struct fpu *dst)
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;
}
@@ -1315,15 +1313,12 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
if (test_kvm_facility(vcpu->kvm, 129)) {
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);
@@ -2326,7 +2321,6 @@ int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
* 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);
generated by cgit (git 2.34.1) at 2024-06-07 08:21:52 +0000