linux-kernel - [PATCH v6 26/33] KVM: VMX: Add missing CPU based VM execution controls to vmcs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220830133737.1539624-27-vkuznets@redhat.com>
Date:   Tue, 30 Aug 2022 15:37:30 +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 26/33] 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.

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 | 9 +++++++++
 arch/x86/kvm/vmx/vmx.h | 6 +++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 779377380399..be69fc3a57a3 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4326,6 +4326,15 @@ static u32 vmx_exec_control(struct vcpu_vmx *vmx)
 {
 	u32 exec_control = vmcs_config.cpu_based_exec_ctrl;
 
+	/*
+	 * Not used by KVM, but fully supported for nesting, i.e. are allowed in
+	 * vmcs12 and propagated to vmcs02 when set in vmcs12.
+	 */
+	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 200a17ca9406..a3da84f4ea45 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -549,9 +549,13 @@ static inline u8 vmx_get_rvi(void)
 #endif
 
 #define KVM_OPTIONAL_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_NMI_WINDOW_EXITING |					\
+	 CPU_BASED_PAUSE_EXITING |					\
 	 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS |			\
 	 CPU_BASED_ACTIVATE_TERTIARY_CONTROLS)
 
-- 
2.37.2