From: Xiaoyao Li <xiaoyao.li@intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
kvm@vger.kernel.org,
Sean Christopherson <sean.j.christopherson@intel.com>,
Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Arvind Sankar <nivedita@alum.mit.edu>,
Xiaoyao Li <xiaoyao.li@intel.com>
Subject: [PATCH v8 2/4] kvm: vmx: Enable MSR TEST_CTRL for guest
Date: Tue, 14 Apr 2020 14:31:27 +0800 [thread overview]
Message-ID: <20200414063129.133630-3-xiaoyao.li@intel.com> (raw)
In-Reply-To: <20200414063129.133630-1-xiaoyao.li@intel.com>
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@intel.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 83050977490c..ae394ed174cd 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;
--
2.20.1
next prev parent reply other threads:[~2020-04-14 6:50 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-14 6:31 [PATCH v8 0/4] KVM: Add virtualization support of split lock detection Xiaoyao Li
2020-04-14 6:31 ` [PATCH v8 1/4] kvm: x86: Emulate MSR IA32_CORE_CAPABILITIES Xiaoyao Li
2020-04-14 6:31 ` Xiaoyao Li [this message]
2020-04-14 6:31 ` [PATCH v8 3/4] x86/split_lock: Export sld_update_msr() and sld_state Xiaoyao Li
2020-04-14 6:31 ` [PATCH v8 4/4] kvm: vmx: virtualize split lock detection Xiaoyao Li
2020-04-15 17:43 ` Thomas Gleixner
2020-04-15 19:18 ` Sean Christopherson
2020-04-15 21:22 ` Thomas Gleixner
2020-04-15 21:43 ` Sean Christopherson
2020-05-05 3:07 ` Sean Christopherson
2020-05-06 12:12 ` Thomas Gleixner
2020-04-16 12:34 ` Xiaoyao Li
2020-04-16 13:33 ` Thomas Gleixner
2020-04-15 19:47 ` Thomas Gleixner
2020-04-16 2:12 ` Xiaoyao Li
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