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KVM: Use alignment properties of vcpu to simplify FPU ops

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Now we use a kmem cache for allocating vcpus, we can get the 16-byte
alignment required by fxsave & fxrstor instructions, and avoid
manually aligning the buffer.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Rusty Russell
2007-07-30 21:13:43 +10:00
committed by Avi Kivity
parent c16f862d02
commit b114b0804d
3 changed files with 25 additions and 41 deletions
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13
drivers/kvm/kvm.h
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@@ -45,10 +45,6 @@
#define KVM_REFILL_PAGES 25
#define KVM_MAX_CPUID_ENTRIES 40
#define FX_IMAGE_SIZE 512
#define FX_IMAGE_ALIGN 16
#define FX_BUF_SIZE (2 * FX_IMAGE_SIZE + FX_IMAGE_ALIGN)
#define DE_VECTOR 0
#define NM_VECTOR 7
#define DF_VECTOR 8
@@ -342,9 +338,8 @@ struct kvm_vcpu {
struct kvm_guest_debug guest_debug;
char fx_buf[FX_BUF_SIZE];
char *host_fx_image;
char *guest_fx_image;
struct i387_fxsave_struct host_fx_image;
struct i387_fxsave_struct guest_fx_image;
int fpu_active;
int guest_fpu_loaded;
@@ -704,12 +699,12 @@ static inline unsigned long read_msr(unsigned long msr)
}
#endif
static inline void fx_save(void *image)
static inline void fx_save(struct i387_fxsave_struct *image)
{
asm ("fxsave (%0)":: "r" (image));
}
static inline void fx_restore(void *image)
static inline void fx_restore(struct i387_fxsave_struct *image)
{
asm ("fxrstor (%0)":: "r" (image));
}