linux-kernel - [PATCH v6 25/33] KVM: VMX: Add missing VMEXIT controls to vmcs

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Message-Id: <20220830133737.1539624-26-vkuznets@redhat.com>
Date:   Tue, 30 Aug 2022 15:37:29 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Yuan Yao <yuan.yao@...ux.intel.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v6 25/33] KVM: VMX: Add missing VMEXIT controls to vmcs_config

As a preparation to reusing the result of setup_vmcs_config() in
nested VMX MSR setup, add the VMEXIT controls which KVM doesn't
use but supports for nVMX to KVM_OPT_VMX_VM_EXIT_CONTROLS and
filter them out in vmx_vmexit_ctrl().

No functional change intended.

Reviewed-by: Jim Mattson <jmattson@...gle.com>
Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/vmx/vmx.c | 7 +++++++
 arch/x86/kvm/vmx/vmx.h | 3 +++
 2 files changed, 10 insertions(+)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 2e0deac5570f..779377380399 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4279,6 +4279,13 @@ static u32 vmx_vmexit_ctrl(void)
 {
 	u32 vmexit_ctrl = vmcs_config.vmexit_ctrl;
 
+	/*
+	 * Not used by KVM and never set in vmcs01 or vmcs02, but emulated for
+	 * nested virtualization and thus allowed to be set in vmcs12.
+	 */
+	vmexit_ctrl &= ~(VM_EXIT_SAVE_IA32_PAT | VM_EXIT_SAVE_IA32_EFER |
+			 VM_EXIT_SAVE_VMX_PREEMPTION_TIMER);
+
 	if (vmx_pt_mode_is_system())
 		vmexit_ctrl &= ~(VM_EXIT_PT_CONCEAL_PIP |
 				 VM_EXIT_CLEAR_IA32_RTIT_CTL);
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index e927d35bece5..200a17ca9406 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -508,7 +508,10 @@ static inline u8 vmx_get_rvi(void)
 #endif
 #define KVM_OPTIONAL_VMX_VM_EXIT_CONTROLS				\
 	      (VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL |			\
+	       VM_EXIT_SAVE_IA32_PAT |					\
 	       VM_EXIT_LOAD_IA32_PAT |					\
+	       VM_EXIT_SAVE_IA32_EFER |					\
+	       VM_EXIT_SAVE_VMX_PREEMPTION_TIMER |			\
 	       VM_EXIT_LOAD_IA32_EFER |					\
 	       VM_EXIT_CLEAR_BNDCFGS |					\
 	       VM_EXIT_PT_CONCEAL_PIP |					\
-- 
2.37.2