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Commit 788fc1e9 authored by Jim Mattson's avatar Jim Mattson Committed by Paolo Bonzini
Browse files

kvm: vmx: Allow guest read access to IA32_TSC 



Let the guest read the IA32_TSC MSR with the generic RDMSR instruction
as well as the specific RDTSC(P) instructions. Note that the hardware
applies the TSC multiplier and offset (when applicable) to the result of
RDMSR(IA32_TSC), just as it does to the result of RDTSC(P).

Signed-off-by: default avatarJim Mattson <jmattson@google.com>
Reviewed-by: default avatarPeter Shier <pshier@google.com>
Reviewed-by: default avatarMarc Orr <marcorr@google.com>
Reviewed-by: default avatarLiran Alon <liran.alon@oracle.com>
Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
parent 9ebdfe52

arch/x86/kvm/vmx/vmx.c

+1 −0
Original line number Diff line number Diff line
@@ -6401,6 +6401,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id) 
		goto free_msrs;



	msr_bitmap = vmx->vmcs01.msr_bitmap;

	vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_TSC, MSR_TYPE_R);

	vmx_disable_intercept_for_msr(msr_bitmap, MSR_FS_BASE, MSR_TYPE_RW);

	vmx_disable_intercept_for_msr(msr_bitmap, MSR_GS_BASE, MSR_TYPE_RW);

	vmx_disable_intercept_for_msr(msr_bitmap, MSR_KERNEL_GS_BASE, MSR_TYPE_RW);