linux-kernel - [PATCH v4 3/5] KVM: x86: dump_vmcs should consider only the load controls of EFER/PAT

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Date:   Wed, 24 Feb 2021 14:04:54 +0000
From:   David Edmondson <david.edmondson@...cle.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jim Mattson <jmattson@...gle.com>, Borislav Petkov <bp@...en8.de>,
        Joerg Roedel <joro@...tes.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org,
        Wanpeng Li <wanpengli@...cent.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        x86@...nel.org, David Edmondson <david.edmondson@...cle.com>
Subject: [PATCH v4 3/5] KVM: x86: dump_vmcs should consider only the load controls of EFER/PAT

When deciding whether to dump the GUEST_IA32_EFER and GUEST_IA32_PAT
fields of the VMCS, examine only the VM entry load controls, as saving
on VM exit has no effect on whether VM entry succeeds or fails.

Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: David Edmondson <david.edmondson@...cle.com>
---
 arch/x86/kvm/vmx/vmx.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 90d677d72502..faeb3d3bd1b8 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5860,11 +5860,9 @@ void dump_vmcs(void)
 	vmx_dump_sel("LDTR:", GUEST_LDTR_SELECTOR);
 	vmx_dump_dtsel("IDTR:", GUEST_IDTR_LIMIT);
 	vmx_dump_sel("TR:  ", GUEST_TR_SELECTOR);
-	if ((vmexit_ctl & VM_EXIT_SAVE_IA32_EFER) ||
-	    (vmentry_ctl & VM_ENTRY_LOAD_IA32_EFER))
+	if (vmentry_ctl & VM_ENTRY_LOAD_IA32_EFER)
 		pr_err("EFER= 0x%016llx\n", vmcs_read64(GUEST_IA32_EFER));
-	if ((vmexit_ctl & VM_EXIT_SAVE_IA32_PAT) ||
-	    (vmentry_ctl & VM_ENTRY_LOAD_IA32_PAT))
+	if (vmentry_ctl & VM_ENTRY_LOAD_IA32_PAT)
 		pr_err("PAT = 0x%016llx\n", vmcs_read64(GUEST_IA32_PAT));
 	pr_err("DebugCtl = 0x%016llx  DebugExceptions = 0x%016lx\n",
 	       vmcs_read64(GUEST_IA32_DEBUGCTL),
-- 
2.30.0