From 1c11e713576edf33b95669be9c2dc0ff1e0c90d3 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Mon, 3 May 2010 16:05:44 +0300 Subject: KVM: VMX: Avoid writing HOST_CR0 every entry cr0.ts may change between entries, so we copy cr0 to HOST_CR0 before each entry. That is slow, so instead, set HOST_CR0 to have TS set unconditionally (which is a safe value), and issue a clts() just before exiting vcpu context if the task indeed owns the fpu. Saves ~50 cycles/exit. Signed-off-by: Avi Kivity --- arch/x86/kvm/x86.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/x86/kvm/x86.c') diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 1b270fd60634..801afc6461ed 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1731,8 +1731,8 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) { - kvm_put_guest_fpu(vcpu); kvm_x86_ops->vcpu_put(vcpu); + kvm_put_guest_fpu(vcpu); } static int is_efer_nx(void) -- cgit v1.2.3