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Thu, 18 Feb 2021 10:04:57 +0000 From: David Edmondson To: linux-kernel@vger.kernel.org Cc: Borislav Petkov , Wanpeng Li , Thomas Gleixner , Ingo Molnar , Paolo Bonzini , Vitaly Kuznetsov , x86@kernel.org, "H. Peter Anvin" , Sean Christopherson , kvm@vger.kernel.org, Jim Mattson , Joerg Roedel , David Edmondson Subject: [PATCH] KVM: x86: dump_vmcs should not assume GUEST_IA32_EFER is valid Date: Thu, 18 Feb 2021 10:04:50 +0000 Message-Id: <20210218100450.2157308-1-david.edmondson@oracle.com> X-Mailer: git-send-email 2.30.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [2001:8b0:bb71:7140:64::1] X-ClientProxiedBy: LO4P123CA0416.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:18b::7) To DM6PR10MB3148.namprd10.prod.outlook.com (2603:10b6:5:1a4::21) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from disaster-area.hh.sledj.net (2001:8b0:bb71:7140:64::1) by LO4P123CA0416.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:18b::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3846.35 via Frontend Transport; Thu, 18 Feb 2021 10:04:55 +0000 Received: from localhost (disaster-area.hh.sledj.net [local]) by disaster-area.hh.sledj.net (OpenSMTPD) with ESMTPA id 2e495f13; 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Fixes: 4eb64dce8d0a ("KVM: x86: dump VMCS on invalid entry") Signed-off-by: David Edmondson --- arch/x86/kvm/vmx/vmx.c | 14 +++++++++----- arch/x86/kvm/vmx/vmx.h | 2 +- 2 files changed, 10 insertions(+), 6 deletions(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index eb69fef57485..74ea4fe6f35e 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -5754,7 +5754,7 @@ static void vmx_dump_dtsel(char *name, uint32_t limit) vmcs_readl(limit + GUEST_GDTR_BASE - GUEST_GDTR_LIMIT)); } -void dump_vmcs(void) +void dump_vmcs(struct kvm_vcpu *vcpu) { u32 vmentry_ctl, vmexit_ctl; u32 cpu_based_exec_ctrl, pin_based_exec_ctrl, secondary_exec_control; @@ -5771,7 +5771,11 @@ void dump_vmcs(void) cpu_based_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); pin_based_exec_ctrl = vmcs_read32(PIN_BASED_VM_EXEC_CONTROL); cr4 = vmcs_readl(GUEST_CR4); - efer = vmcs_read64(GUEST_IA32_EFER); + if ((vmexit_ctl & VM_EXIT_SAVE_IA32_EFER) || + (vmentry_ctl & VM_ENTRY_LOAD_IA32_EFER)) + efer = vmcs_read64(GUEST_IA32_EFER); + else + efer = vcpu->arch.efer; secondary_exec_control = 0; if (cpu_has_secondary_exec_ctrls()) secondary_exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL); @@ -5955,7 +5959,7 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath) } if (exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) { - dump_vmcs(); + dump_vmcs(vcpu); vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY; vcpu->run->fail_entry.hardware_entry_failure_reason = exit_reason; @@ -5964,7 +5968,7 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath) } if (unlikely(vmx->fail)) { - dump_vmcs(); + dump_vmcs(vcpu); vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY; vcpu->run->fail_entry.hardware_entry_failure_reason = vmcs_read32(VM_INSTRUCTION_ERROR); @@ -6049,7 +6053,7 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath) unexpected_vmexit: vcpu_unimpl(vcpu, "vmx: unexpected exit reason 0x%x\n", exit_reason); - dump_vmcs(); + dump_vmcs(vcpu); vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_UNEXPECTED_EXIT_REASON; diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h index 9d3a557949ac..f8a0ce74798e 100644 --- a/arch/x86/kvm/vmx/vmx.h +++ b/arch/x86/kvm/vmx/vmx.h @@ -489,6 +489,6 @@ static inline bool vmx_guest_state_valid(struct kvm_vcpu *vcpu) return is_unrestricted_guest(vcpu) || __vmx_guest_state_valid(vcpu); } -void dump_vmcs(void); +void dump_vmcs(struct kvm_vcpu *vcpu); #endif /* __KVM_X86_VMX_H */ -- 2.30.0