[PATCH] KVM: Handle MSR_IA32_PERF_CTL
From: Dmitry Bilunov
Date: Tue May 31 2016 - 10:48:24 EST
Intel CPUs having Turbo Boost feature implement an MSR to provide a
control interface via rdmsr/wrmsr instructions. One could detect the
presence of this feature by issuing one of these instructions and
handling the #GP exception which is generated in case the referenced MSR
is not implemented by the CPU.
KVM's vCPU model behaves exactly as a real CPU in this case by injecting
a fault when MSR_IA32_PERF_CTL is called (which KVM does not support).
However, some operating systems use this register during an early boot
stage in which their kernel is not capable of handling #GP correctly,
causing #DP and finally a triple fault effectively resetting the vCPU.
This patch implements a dummy handler for MSR_IA32_PERF_CTL to avoid the
Signed-off-by: Dmitry Bilunov <kmeaw@xxxxxxxxxxxxxx>
arch/x86/kvm/x86.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c805cf4..d0a5b4b 100644
@@ -2314,6 +2314,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
+ case MSR_IA32_PERF_CTL:
msr_info->data = 0;
case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3: