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[PATCH] KVM: AMD SVM: Save and restore the floating point unit state 

Fixes sf bug 1614113 (segfaults in nbench).

Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Avi Kivity 2006-12-22 01:05:20 -08:00 committed by Linus Torvalds
parent 0e859cacb0
commit 36241b8c7c
1 changed files with 9 additions and 0 deletions
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9
drivers/kvm/svm.c
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@ -575,6 +575,8 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu)
memset(vcpu->svm->db_regs, 0, sizeof(vcpu->svm->db_regs));
init_vmcb(vcpu->svm->vmcb);
fx_init(vcpu);
return 0;
out2:
@ -1387,6 +1389,10 @@ static int svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
save_db_regs(vcpu->svm->host_db_regs);
load_db_regs(vcpu->svm->db_regs);
}
fx_save(vcpu->host_fx_image);
fx_restore(vcpu->guest_fx_image);
asm volatile (
#ifdef CONFIG_X86_64
"push %%rbx; push %%rcx; push %%rdx;"
@ -1496,6 +1502,9 @@ static int svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
#endif
: "cc", "memory" );
fx_save(vcpu->guest_fx_image);
fx_restore(vcpu->host_fx_image);
if ((vcpu->svm->vmcb->save.dr7 & 0xff))
load_db_regs(vcpu->svm->host_db_regs);