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x86/fpu: Create 'union thread_xstate' helper for fpstate_init()

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fpstate_init() only uses fpu->state, so pass that in to it.

This enables the cleanup we will do in the next patch.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2015-04-30 10:23:42 +02:00
parent 0aba697894
commit bf935b0b52
4 changed files with 10 additions and 10 deletions
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2
arch/x86/include/asm/fpu/internal.h
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@ -29,7 +29,7 @@ extern void fpu__init_system(struct cpuinfo_x86 *c);
extern void fpu__activate_curr(struct fpu *fpu); extern void fpu__activate_curr(struct fpu *fpu);
extern void fpstate_init(struct fpu *fpu); extern void fpstate_init(union thread_xstate *state);
#ifdef CONFIG_MATH_EMULATION #ifdef CONFIG_MATH_EMULATION
extern void fpstate_init_soft(struct i387_soft_struct *soft); extern void fpstate_init_soft(struct i387_soft_struct *soft);
#else #else

14
arch/x86/kernel/fpu/core.c
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@ -202,19 +202,19 @@ static inline void fpstate_init_fstate(struct i387_fsave_struct *fp)
fp->fos = 0xffff0000u; fp->fos = 0xffff0000u;
} }
void fpstate_init(struct fpu *fpu) void fpstate_init(union thread_xstate *state)
{ {
if (!cpu_has_fpu) { if (!cpu_has_fpu) {
fpstate_init_soft(&fpu->state.soft); fpstate_init_soft(&state->soft);
return; return;
} }
memset(&fpu->state, 0, xstate_size); memset(state, 0, xstate_size);
if (cpu_has_fxsr) if (cpu_has_fxsr)
fpstate_init_fxstate(&fpu->state.fxsave); fpstate_init_fxstate(&state->fxsave);
else else
fpstate_init_fstate(&fpu->state.fsave); fpstate_init_fstate(&state->fsave);
} }
EXPORT_SYMBOL_GPL(fpstate_init); EXPORT_SYMBOL_GPL(fpstate_init);
@ -282,7 +282,7 @@ void fpu__activate_curr(struct fpu *fpu)
WARN_ON_ONCE(fpu != &current->thread.fpu); WARN_ON_ONCE(fpu != &current->thread.fpu);
if (!fpu->fpstate_active) { if (!fpu->fpstate_active) {
fpstate_init(fpu); fpstate_init(&fpu->state);
/* Safe to do for the current task: */ /* Safe to do for the current task: */
fpu->fpstate_active = 1; fpu->fpstate_active = 1;
@ -321,7 +321,7 @@ static void fpu__activate_stopped(struct fpu *child_fpu)
if (child_fpu->fpstate_active) { if (child_fpu->fpstate_active) {
child_fpu->last_cpu = -1; child_fpu->last_cpu = -1;
} else { } else {
fpstate_init(child_fpu); fpstate_init(&child_fpu->state);
/* Safe to do for stopped child tasks: */ /* Safe to do for stopped child tasks: */
child_fpu->fpstate_active = 1; child_fpu->fpstate_active = 1;

2
arch/x86/kernel/fpu/xstate.c
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@ -456,7 +456,7 @@ static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
if (__copy_from_user(&fpu->state.xsave, buf_fx, state_size) || if (__copy_from_user(&fpu->state.xsave, buf_fx, state_size) ||
__copy_from_user(&env, buf, sizeof(env))) { __copy_from_user(&env, buf, sizeof(env))) {
fpstate_init(fpu); fpstate_init(&fpu->state);
err = -1; err = -1;
} else { } else {
sanitize_restored_xstate(tsk, &env, xfeatures, fx_only); sanitize_restored_xstate(tsk, &env, xfeatures, fx_only);

2
arch/x86/kvm/x86.c
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@ -7004,7 +7004,7 @@ int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
static void fx_init(struct kvm_vcpu *vcpu) static void fx_init(struct kvm_vcpu *vcpu)
{ {
fpstate_init(&vcpu->arch.guest_fpu); fpstate_init(&vcpu->arch.guest_fpu.state);
if (cpu_has_xsaves) if (cpu_has_xsaves)
vcpu->arch.guest_fpu.state.xsave.header.xcomp_bv = vcpu->arch.guest_fpu.state.xsave.header.xcomp_bv =
host_xcr0 | XSTATE_COMPACTION_ENABLED; host_xcr0 | XSTATE_COMPACTION_ENABLED;