linux-kernel - [PATCH 08/14] KVM: VMX: Add missing CPU based VM execution controls to vmcs

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Message-Id: <20220627160440.31857-9-vkuznets@redhat.com>
Date:   Mon, 27 Jun 2022 18:04:34 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     Anirudh Rayabharam <anrayabh@...ux.microsoft.com>,
        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 08/14] KVM: VMX: Add missing CPU based VM execution controls to vmcs_config

As a preparation to reusing the result of setup_vmcs_config() in
nested VMX MSR setup, add the CPU based VM execution controls which KVM
doesn't use but supports for nVMX to KVM_OPT_VMX_CPU_BASED_VM_EXEC_CONTROL
and filter them out in vmx_exec_control().

No functional change intended.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 arch/x86/kvm/vmx/vmx.c | 6 ++++++
 arch/x86/kvm/vmx/vmx.h | 6 +++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 3846a8c7102a..bad55d52aa28 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4249,6 +4249,12 @@ static u32 vmx_exec_control(struct vcpu_vmx *vmx)
 {
 	u32 exec_control = vmcs_config.cpu_based_exec_ctrl;
 
+	/* Not used by KVM but supported for nesting. */
+	exec_control &= ~(CPU_BASED_RDTSC_EXITING |
+			  CPU_BASED_USE_IO_BITMAPS |
+			  CPU_BASED_MONITOR_TRAP_FLAG |
+			  CPU_BASED_PAUSE_EXITING);
+
 	/* INTR_WINDOW_EXITING and NMI_WINDOW_EXITING are toggled dynamically */
 	exec_control &= ~(CPU_BASED_INTR_WINDOW_EXITING |
 			  CPU_BASED_NMI_WINDOW_EXITING);
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index 6b44f4c1d45f..2ba1f99a8671 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -542,8 +542,12 @@ static inline u8 vmx_get_rvi(void)
 #endif
 
 #define KVM_OPT_VMX_CPU_BASED_VM_EXEC_CONTROL			\
-	(CPU_BASED_TPR_SHADOW |					\
+	(CPU_BASED_RDTSC_EXITING |				\
+	CPU_BASED_TPR_SHADOW |					\
+	CPU_BASED_USE_IO_BITMAPS |				\
+	CPU_BASED_MONITOR_TRAP_FLAG |				\
 	CPU_BASED_USE_MSR_BITMAPS |				\
+	CPU_BASED_PAUSE_EXITING |				\
 	CPU_BASED_ACTIVATE_SECONDARY_CONTROLS |			\
 	CPU_BASED_ACTIVATE_TERTIARY_CONTROLS)
 
-- 
2.35.3