Commit 0c2df2a1 authored May 31, 2016 by Dmitry Bilunov Committed by Radim Krčmář Jun 02, 2016

KVM: Handle MSR_IA32_PERF_CTL



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
crashes.

Signed-off-by: Dmitry Bilunov <kmeaw@yandex-team.ru>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

parent b19ee2ff

arch/x86/kvm/x86.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -2314,6 +2314,7 @@ int kvm_get_msr_common(struct kvm_vcpu vcpu, struct msr_data msr_info)
		case MSR_AMD64_NB_CFG:
		case MSR_FAM10H_MMIO_CONF_BASE:
		case MSR_AMD64_BU_CFG2:
		case MSR_IA32_PERF_CTL:
		msr_info->data = 0;
		break;
		case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3:

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