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| author | Avi Kivity <avi@redhat.com> | 2009-05-03 17:50:55 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-05-11 10:19:00 +0200 |
| commit | e286e86e6d2042d67d09244aa0e05ffef75c9d54 (patch) | |
| tree | 6fbabd149ba7e0b2fa06a03f39cebe268de9dc8b /arch/x86 | |
| parent | KVM: Fix NX support reporting (diff) | |
| download | linux-e286e86e6d2042d67d09244aa0e05ffef75c9d54.tar.xz linux-e286e86e6d2042d67d09244aa0e05ffef75c9d54.zip | |
KVM: Make EFER reads safe when EFER does not exist
Some processors don't have EFER; don't oops if userspace wants us to
read EFER when we check NX.
Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86')
| -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 834a7bf25e48..49079a46687b 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1121,9 +1121,9 @@ 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; } |