[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>
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index 3bf2579..59c930f 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -575,6 +575,8 @@
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 @@
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 @@
#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);