[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>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index 3bf25795b3ef..59c930f276e2 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -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 @@ again:
                 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 @@ again:
 #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);