linux-kernel - [PATCH RFC v1 03/10] KVM: VMX: Move CPU_BASED_{CR3_LOAD,CR3_STORE,INVLPG}_EXITING filtering out of setup_vmcs

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Message-Id: <20220622164432.194640-4-vkuznets@redhat.com>
Date:   Wed, 22 Jun 2022 18:44:25 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Anirudh Rayabharam <anrayabh@...ux.microsoft.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH RFC v1 03/10] KVM: VMX: Move CPU_BASED_{CR3_LOAD,CR3_STORE,INVLPG}_EXITING filtering out of setup_vmcs_config()

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 arch/x86/kvm/vmx/vmx.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 01294a2fc1c1..4583de7f0324 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4293,6 +4293,16 @@ static u32 vmx_exec_control(struct vcpu_vmx *vmx)
 			  CPU_BASED_MONITOR_TRAP_FLAG |
 			  CPU_BASED_PAUSE_EXITING);
 
+	if (vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_ENABLE_EPT) {
+		/*
+		 * CR3 accesses and invlpg don't need to cause VM Exits when EPT
+		 * enabled.
+		 */
+		exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING |
+				  CPU_BASED_CR3_STORE_EXITING |
+				  CPU_BASED_INVLPG_EXITING);
+	}
+
 #ifdef CONFIG_X86_64
 	if (exec_control & CPU_BASED_TPR_SHADOW)
 		exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
-- 
2.35.3