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KVM: Lazy FPU support for SVM

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Avoid saving and restoring the guest fpu state on every exit.  This
shaves ~100 cycles off the guest/host switch.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Anthony Liguori
2007-04-23 09:17:21 -05:00
committed by Avi Kivity
parent 4c690a1e86
commit 7807fa6ca5
2 changed files with 33 additions and 4 deletions
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2
drivers/kvm/kvm.h
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@@ -63,6 +63,7 @@
#define FX_BUF_SIZE (2 * FX_IMAGE_SIZE + FX_IMAGE_ALIGN)
#define DE_VECTOR 0
#define NM_VECTOR 7
#define DF_VECTOR 8
#define TS_VECTOR 10
#define NP_VECTOR 11
@@ -301,6 +302,7 @@ struct kvm_vcpu {
char fx_buf[FX_BUF_SIZE];
char *host_fx_image;
char *guest_fx_image;
int fpu_active;
int mmio_needed;
int mmio_read_completed;