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| author | Joerg Roedel <joerg.roedel@amd.com> | 2007-07-18 20:51:36 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-08-10 01:27:30 +0400 |
| commit | fa10a71942870a670113152f1d948393636d3c4a (patch) | |
| tree | 17e453d8757a7b9fa7c4925edbb0ce5268e6a9c2 | |
| parent | 668df9fe157abbc90efc0ca054048300afb5937c (diff) | |
| download | linux-fa10a71942870a670113152f1d948393636d3c4a.tar.xz | |
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/kvm/svm.c | 6 | ||||
| -rw-r--r-- | drivers/kvm/svm.h | 3 |
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c index fa17d6d4f0cb..aee952fa029d 100644 --- a/drivers/kvm/svm.c +++ b/drivers/kvm/svm.c @@ -1727,6 +1727,12 @@ 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; } diff --git a/drivers/kvm/svm.h b/drivers/kvm/svm.h index 5e93814400ce..3b1b0f35b6cb 100644 --- a/drivers/kvm/svm.h +++ b/drivers/kvm/svm.h @@ -175,8 +175,11 @@ struct __attribute__ ((__packed__)) vmcb { #define SVM_CPUID_FUNC 0x8000000a #define MSR_EFER_SVME_MASK (1ULL << 12) +#define MSR_VM_CR 0xc0010114 #define MSR_VM_HSAVE_PA 0xc0010117ULL +#define SVM_VM_CR_SVM_DISABLE 4 + #define SVM_SELECTOR_S_SHIFT 4 #define SVM_SELECTOR_DPL_SHIFT 5 #define SVM_SELECTOR_P_SHIFT 7 |