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| author | Joerg Roedel | 2007-06-22 11:29:50 +0200 |
|---|---|---|
| committer | Avi Kivity | 2007-07-16 11:05:49 +0200 |
| commit | 6031a61c2ef4cf22b69ef5494aefa54b84a27d2f (patch) | |
| tree | 2e0ccd861da726e76785a0a68a46da06951f1eb0 /drivers/kvm/svm.c | |
| parent | KVM: VMX: Remove unnecessary code in vmx_tlb_flush() (diff) | |
| download | kernel-qcow2-linux-6031a61c2ef4cf22b69ef5494aefa54b84a27d2f.tar.gz kernel-qcow2-linux-6031a61c2ef4cf22b69ef5494aefa54b84a27d2f.tar.xz kernel-qcow2-linux-6031a61c2ef4cf22b69ef5494aefa54b84a27d2f.zip | |
KVM: SVM: Reliably detect if SVM was disabled by BIOS
This patch adds an implementation to the svm is_disabled function to
detect reliably if the BIOS disabled the SVM feature in the CPU. This
fixes the issues with kernel panics when loading the kvm-amd module on
machines where SVM is available but disabled.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/svm.c')
| -rw-r--r-- | drivers/kvm/svm.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c index 62ec38c7027b..a0d442883e17 100644 --- a/drivers/kvm/svm.c +++ b/drivers/kvm/svm.c @@ -1735,6 +1735,12 @@ static void svm_inject_page_fault(struct kvm_vcpu *vcpu, static int is_disabled(void) { + u64 vm_cr; + + rdmsrl(MSR_VM_CR, vm_cr); + if (vm_cr & (1 << SVM_VM_CR_SVM_DISABLE)) + return 1; + return 0; } |