KVM: x86: Ignore reads to EVNTSEL MSRs

(cherry picked from commit 7fe29e0faacb650d31b9e9f538203a157bec821d)

We ignore writes to the performance counters and performance event
selector registers already. Kaspersky antivirus reads the eventsel
MSR causing it to crash with the current behaviour.

Return 0 as data when the eventsel registers are read to stop the
crash.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bbacdce35c4d51bd068375528c5acf4cecc5a61f..3877da1d0e6195cc2b1bb2b97d0d5fc64d0241f6 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -898,6 +898,8 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
        case MSR_IA32_LASTINTFROMIP:
        case MSR_IA32_LASTINTTOIP:
        case MSR_VM_HSAVE_PA:
+       case MSR_P6_EVNTSEL0:
+       case MSR_P6_EVNTSEL1:
                data = 0;
                break;
        case MSR_MTRRcap: