| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.19 065/219] kvm: vmx: Set IA32_TSC_AUX for legacy mode guests | Date | Fri, 22 Nov 2019 00:46:37 -0500 |
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From: Jim Mattson <jmattson@google.com>
[ Upstream commit 0023ef39dc35c773c436eaa46ca539a26b308b55 ]
RDTSCP is supported in legacy mode as well as long mode. The IA32_TSC_AUX MSR should be set to the correct guest value before entering any guest that supports RDTSCP.
Fixes: 4e47c7a6d714 ("KVM: VMX: Add instruction rdtscp support for guest") Signed-off-by: Jim Mattson <jmattson@google.com> Reviewed-by: Peter Shier <pshier@google.com> Reviewed-by: Marc Orr <marcorr@google.com> Reviewed-by: Liran Alon <liran.alon@oracle.com> Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- arch/x86/kvm/vmx.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 4eda2a9c234a6..b892f345f6317 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3404,9 +3404,6 @@ static void setup_msrs(struct vcpu_vmx *vmx) index = __find_msr_index(vmx, MSR_CSTAR); if (index >= 0) move_msr_up(vmx, index, save_nmsrs++); - index = __find_msr_index(vmx, MSR_TSC_AUX); - if (index >= 0 && guest_cpuid_has(&vmx->vcpu, X86_FEATURE_RDTSCP)) - move_msr_up(vmx, index, save_nmsrs++); /* * MSR_STAR is only needed on long mode guests, and only * if efer.sce is enabled. @@ -3419,6 +3416,9 @@ static void setup_msrs(struct vcpu_vmx *vmx) index = __find_msr_index(vmx, MSR_EFER); if (index >= 0 && update_transition_efer(vmx, index)) move_msr_up(vmx, index, save_nmsrs++); + index = __find_msr_index(vmx, MSR_TSC_AUX); + if (index >= 0 && guest_cpuid_has(&vmx->vcpu, X86_FEATURE_RDTSCP)) + move_msr_up(vmx, index, save_nmsrs++); vmx->save_nmsrs = save_nmsrs; vmx->guest_msrs_dirty = true; -- 2.20.1
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