KVM: introduce module parameter for ignoring unknown MSRs accesses

KVM will inject a #GP into the guest if that tries to access unhandled
MSRs. This will crash many guests. Although it would be the correct
way to actually handle these MSRs, we introduce a runtime switchable
module param called "ignore_msrs" (defaults to 0). If this is Y, unknown
MSR reads will return 0, while MSR writes are simply dropped. In both cases
we print a message to dmesg to inform the user about that.

You can change the behaviour at any time by saying:

 # echo 1 > /sys/modules/kvm/parameters/ignore_msrs

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 20 insertions, 4 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6aace61fdb62..0be75d53b7fd 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -83,6 +83,9 @@ struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
 struct kvm_x86_ops *kvm_x86_ops;
 EXPORT_SYMBOL_GPL(kvm_x86_ops);
 
+int ignore_msrs = 0;
+module_param_named(ignore_msrs, ignore_msrs, bool, S_IRUGO | S_IWUSR);
+
 struct kvm_stats_debugfs_item debugfs_entries[] = {
         { "pf_fixed", VCPU_STAT(pf_fixed) },
         { "pf_guest", VCPU_STAT(pf_guest) },
@@ -930,8 +933,15 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
                         "0x%x data 0x%llx\n", msr, data);
                 break;
         default:
-                pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n", msr, data);
-                return 1;
+                if (!ignore_msrs) {
+                        pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n",
+                                msr, data);
+                        return 1;
+                } else {
+                        pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n",
+                                msr, data);
+                        break;
+                }
         }
         return 0;
 }
@@ -1078,8 +1088,14 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
         case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
                 return get_msr_mce(vcpu, msr, pdata);
         default:
-                pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
-                return 1;
+                if (!ignore_msrs) {
+                        pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
+                        return 1;
+                } else {
+                        pr_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr);
+                        data = 0;
+                }
+                break;
         }
         *pdata = data;
         return 0;