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authorJoerg Roedel <joerg.roedel@amd.com>2007-07-18 19:51:36 +0300
committerWilly Tarreau <w@1wt.eu>2007-08-25 17:24:02 +0200
commitd4d4eb0442422123ac0fb4a560af2ad481817397 (patch)
tree3eda70cc6af36bc2d7dc3948581e1445334b2154
parentc3338ef326869755751ae61897c5b475439f557d (diff)
[PATCH] 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> Signed-off-by: Willy Tarreau <w@1wt.eu>
-rw-r--r--drivers/kvm/svm.c6
-rw-r--r--drivers/kvm/svm.h3
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index c79df79307ed..1e90401b5668 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -1655,6 +1655,12 @@ 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 df731c3fb588..e8f034955646 100644
--- a/drivers/kvm/svm.h
+++ b/drivers/kvm/svm.h
@@ -172,8 +172,11 @@ 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