diff options
| author | Avi Kivity <avi@redhat.com> | 2009-05-03 18:50:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-05-18 16:35:19 -0700 |
| commit | 21616cb7a37a63b9f33ea2e45ab6d29910b43fd2 (patch) | |
| tree | 827e496d90983666abc0400a73cf2f7fc374510c | |
| parent | a6ddabcdf09bf394de04ca5c772129cb8fc6e179 (diff) | |
KVM: Make EFER reads safe when EFER does not exist
commit e286e86e6d2042d67d09244aa0e05ffef75c9d54 upstream.
Some processors don't have EFER; don't oops if userspace wants us to
read EFER when we check NX.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | arch/x86/kvm/x86.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 425423eff48..92f0457ebe5 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1075,9 +1075,9 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) static int is_efer_nx(void) { - u64 efer; + unsigned long long efer = 0; - rdmsrl(MSR_EFER, efer); + rdmsrl_safe(MSR_EFER, &efer); return efer & EFER_NX; } |