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KVM: x86: Use FPU API

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Convert KVM to use generic FPU API.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Sheng Yang 2010-05-17 17:08:28 +08:00 committed by Avi Kivity
parent 7cf30855e0
commit 98918833a3
2 changed files with 17 additions and 52 deletions
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17
arch/x86/include/asm/kvm_host.h
View File

@ -301,7 +301,7 @@ struct kvm_vcpu_arch {
unsigned long mmu_seq;
} update_pte;
struct i387_fxsave_struct guest_fx_image;
struct fpu guest_fpu;
gva_t mmio_fault_cr2;
struct kvm_pio_request pio;
@ -708,21 +708,6 @@ static inline unsigned long read_msr(unsigned long msr)
}
#endif
static inline void kvm_fx_save(struct i387_fxsave_struct *image)
{
asm("fxsave (%0)":: "r" (image));
}
static inline void kvm_fx_restore(struct i387_fxsave_struct *image)
{
asm("fxrstor (%0)":: "r" (image));
}
static inline void kvm_fx_finit(void)
{
asm("finit");
}
static inline u32 get_rdx_init_val(void)
{
return 0x600; /* P6 family */

52
arch/x86/kvm/x86.c
View File

@ -53,6 +53,7 @@
#include <asm/mtrr.h>
#include <asm/mce.h>
#include <asm/i387.h>
#include <asm/xcr.h>
#define MAX_IO_MSRS 256
#define CR0_RESERVED_BITS \
@ -5057,27 +5058,6 @@ out:
return r;
}
/*
* fxsave fpu state. Taken from x86_64/processor.h. To be killed when
* we have asm/x86/processor.h
*/
struct fxsave {
u16 cwd;
u16 swd;
u16 twd;
u16 fop;
u64 rip;
u64 rdp;
u32 mxcsr;
u32 mxcsr_mask;
u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
#ifdef CONFIG_X86_64
u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
#else
u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
#endif
};
/*
* Translate a guest virtual address to a guest physical address.
*/
@ -5101,7 +5081,8 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
struct i387_fxsave_struct *fxsave =
&vcpu->arch.guest_fpu.state->fxsave;
memcpy(fpu->fpr, fxsave->st_space, 128);
fpu->fcw = fxsave->cwd;
@ -5117,7 +5098,8 @@ int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
struct i387_fxsave_struct *fxsave =
&vcpu->arch.guest_fpu.state->fxsave;
memcpy(fxsave->st_space, fpu->fpr, 128);
fxsave->cwd = fpu->fcw;
@ -5133,22 +5115,18 @@ int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
void fx_init(struct kvm_vcpu *vcpu)
{
unsigned after_mxcsr_mask;
/* Initialize guest FPU by resetting ours and saving into guest's */
preempt_disable();
kvm_fx_finit();
kvm_fx_save(&vcpu->arch.guest_fx_image);
preempt_enable();
fpu_alloc(&vcpu->arch.guest_fpu);
fpu_finit(&vcpu->arch.guest_fpu);
vcpu->arch.cr0 |= X86_CR0_ET;
after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
vcpu->arch.guest_fx_image.mxcsr = 0x1f80;
memset((void *)&vcpu->arch.guest_fx_image + after_mxcsr_mask,
0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
}
EXPORT_SYMBOL_GPL(fx_init);
static void fx_free(struct kvm_vcpu *vcpu)
{
fpu_free(&vcpu->arch.guest_fpu);
}
void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
{
if (vcpu->guest_fpu_loaded)
@ -5156,7 +5134,7 @@ void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
vcpu->guest_fpu_loaded = 1;
unlazy_fpu(current);
kvm_fx_restore(&vcpu->arch.guest_fx_image);
fpu_restore_checking(&vcpu->arch.guest_fpu);
trace_kvm_fpu(1);
}
@ -5166,7 +5144,7 @@ void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
return;
vcpu->guest_fpu_loaded = 0;
kvm_fx_save(&vcpu->arch.guest_fx_image);
fpu_save_init(&vcpu->arch.guest_fpu);
++vcpu->stat.fpu_reload;
set_bit(KVM_REQ_DEACTIVATE_FPU, &vcpu->requests);
trace_kvm_fpu(0);
@ -5179,6 +5157,7 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
vcpu->arch.time_page = NULL;
}
fx_free(vcpu);
kvm_x86_ops->vcpu_free(vcpu);
}
@ -5213,6 +5192,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
kvm_mmu_unload(vcpu);
vcpu_put(vcpu);
fx_free(vcpu);
kvm_x86_ops->vcpu_free(vcpu);
}