KVM: Add FFXSR support

AMD K10 CPUs implement the FFXSR feature that gets enabled using
EFER. Let's check if the virtual CPU description includes that
CPUID feature bit and allow enabling it then.

This is required for Windows Server 2008 in Hyper-V mode.

v2 adds CPUID capability exposure

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index db5021b2b5a8..1c4a018bf4bb 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -417,6 +417,9 @@ static __init int svm_hardware_setup(void)
         if (boot_cpu_has(X86_FEATURE_NX))
                 kvm_enable_efer_bits(EFER_NX);
 
+        if (boot_cpu_has(X86_FEATURE_FXSR_OPT))
+                kvm_enable_efer_bits(EFER_FFXSR);
+
         if (nested) {
                 printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
                 kvm_enable_efer_bits(EFER_SVME);