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From:   Chenyi Qiang <chenyi.qiang@intel.com>
To:     Paolo Bonzini <pbonzini@redhat.com>,
        Sean Christopherson <sean.j.christopherson@intel.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>,
        Xiaoyao Li <xiaoyao.li@intel.com>
Cc:     kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 3/5] KVM: nVMX: Update VMX controls MSR according to guest CPUID after setting VMX MSRs
Date:   Fri, 28 Aug 2020 16:56:20 +0800
Message-Id: <20200828085622.8365-4-chenyi.qiang@intel.com>
In-Reply-To: <20200828085622.8365-1-chenyi.qiang@intel.com>
References: <20200828085622.8365-1-chenyi.qiang@intel.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Update the fields (i.e. VM_{ENTRY_LOAD, EXIT_CLEAR}_BNDCFGS and
VM_{ENTRY, EXIT}_LOAD_IA32_PERF_GLOBAL_CTRL) in
nested MSR_IA32_VMX_TRUE_{ENTRY, EXIT}_CTLS according to guest CPUID
when user space initializes the features MSRs. Regardless of the order
of SET_CPUID and SET_MSRS from the user space, do the update to avoid
MSR values overriding.

Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
---
 arch/x86/kvm/vmx/vmx.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 819c185adf09..f9664ccc003b 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -345,6 +345,7 @@ static bool guest_state_valid(struct kvm_vcpu *vcpu);
 static u32 vmx_segment_access_rights(struct kvm_segment *var);
 static __always_inline void vmx_disable_intercept_for_msr(unsigned long *msr_bitmap,
 							  u32 msr, int type);
+static void nested_vmx_entry_exit_ctls_update(struct kvm_vcpu *vcpu);
 
 void vmx_vmexit(void);
 
@@ -2161,7 +2162,10 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 			return 1; /* they are read-only */
 		if (!nested_vmx_allowed(vcpu))
 			return 1;
-		return vmx_set_vmx_msr(vcpu, msr_index, data);
+		ret = vmx_set_vmx_msr(vcpu, msr_index, data);
+		nested_vmx_pmu_entry_exit_ctls_update(vcpu);
+		nested_vmx_entry_exit_ctls_update(vcpu);
+		break;
 	case MSR_IA32_RTIT_CTL:
 		if (!vmx_pt_mode_is_host_guest() ||
 			vmx_rtit_ctl_check(vcpu, data) ||
-- 
2.17.1