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Date: Sat, 9 May 2020 19:05:40 +0800 From: Xiaoyao Li <xiaoyao.li@...el.com> To: Paolo Bonzini <pbonzini@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Sean Christopherson <sean.j.christopherson@...el.com>, kvm@...r.kernel.org Cc: linux-kernel@...r.kernel.org, x86@...nel.org, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>, peterz@...radead.org, Arvind Sankar <nivedita@...m.mit.edu>, Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>, Xiaoyao Li <xiaoyao.li@...el.com> Subject: [PATCH v9 6/8] KVM: VMX: Enable MSR TEST_CTRL for guest Unconditionally allow the guest to read and zero-write MSR TEST_CTRL. This matches the fact that most Intel CPUs support MSR TEST_CTRL, and it also alleviates the effort to handle wrmsr/rdmsr when split lock detection is exposed to the guest in a future patch. Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com> --- arch/x86/kvm/vmx/vmx.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index c2c6335a998c..dbec38ad5035 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -1789,6 +1789,9 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) u32 index; switch (msr_info->index) { + case MSR_TEST_CTRL: + msr_info->data = 0; + break; #ifdef CONFIG_X86_64 case MSR_FS_BASE: msr_info->data = vmcs_readl(GUEST_FS_BASE); @@ -1942,6 +1945,11 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) u32 index; switch (msr_index) { + case MSR_TEST_CTRL: + if (data) + return 1; + + break; case MSR_EFER: ret = kvm_set_msr_common(vcpu, msr_info); break; -- 2.18.2
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