linux-kernel - [RFC PATCH v2 52/69] KVM: VMX: Split out guts of EPT violation to common/exposed function

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Message-Id: <8e246d479e8986172d19704ef4ef4d2b666d5ac1.1625186503.git.isaku.yamahata@intel.com>
Date:   Fri,  2 Jul 2021 15:04:58 -0700
From:   isaku.yamahata@...el.com
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [RFC PATCH v2 52/69] KVM: VMX: Split out guts of EPT violation to common/exposed function

From: Sean Christopherson <sean.j.christopherson@...el.com>

Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/vmx/common.h | 29 +++++++++++++++++++++++++++++
 arch/x86/kvm/vmx/vmx.c    | 33 +++++----------------------------
 2 files changed, 34 insertions(+), 28 deletions(-)

diff --git a/arch/x86/kvm/vmx/common.h b/arch/x86/kvm/vmx/common.h
index 81c73f30d01d..9e5865b05d47 100644
--- a/arch/x86/kvm/vmx/common.h
+++ b/arch/x86/kvm/vmx/common.h
@@ -5,8 +5,11 @@
 #include <linux/kvm_host.h>
 
 #include <asm/traps.h>
+#include <asm/vmx.h>
 
+#include "mmu.h"
 #include "vmcs.h"
+#include "vmx.h"
 #include "x86.h"
 
 extern unsigned long vmx_host_idt_base;
@@ -49,4 +52,30 @@ static inline void vmx_handle_external_interrupt_irqoff(struct kvm_vcpu *vcpu,
 	vmx_handle_interrupt_nmi_irqoff(vcpu, gate_offset(desc));
 }
 
+static inline int __vmx_handle_ept_violation(struct kvm_vcpu *vcpu, gpa_t gpa,
+					     unsigned long exit_qualification)
+{
+	u64 error_code;
+
+	/* Is it a read fault? */
+	error_code = (exit_qualification & EPT_VIOLATION_ACC_READ)
+		     ? PFERR_USER_MASK : 0;
+	/* Is it a write fault? */
+	error_code |= (exit_qualification & EPT_VIOLATION_ACC_WRITE)
+		      ? PFERR_WRITE_MASK : 0;
+	/* Is it a fetch fault? */
+	error_code |= (exit_qualification & EPT_VIOLATION_ACC_INSTR)
+		      ? PFERR_FETCH_MASK : 0;
+	/* ept page table entry is present? */
+	error_code |= (exit_qualification &
+		       (EPT_VIOLATION_READABLE | EPT_VIOLATION_WRITABLE |
+			EPT_VIOLATION_EXECUTABLE))
+		      ? PFERR_PRESENT_MASK : 0;
+
+	error_code |= (exit_qualification & EPT_VIOLATION_GVA_TRANSLATED) != 0 ?
+	       PFERR_GUEST_FINAL_MASK : PFERR_GUEST_PAGE_MASK;
+
+	return kvm_mmu_page_fault(vcpu, gpa, error_code, NULL, 0);
+}
+
 #endif /* __KVM_X86_VMX_COMMON_H */
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 452d4d1400db..8a104a54121b 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5328,11 +5328,10 @@ static int handle_task_switch(struct kvm_vcpu *vcpu)
 
 static int handle_ept_violation(struct kvm_vcpu *vcpu)
 {
-	unsigned long exit_qualification;
-	gpa_t gpa;
-	u64 error_code;
+	unsigned long exit_qualification = vmx_get_exit_qual(vcpu);
+	gpa_t gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
 
-	exit_qualification = vmx_get_exit_qual(vcpu);
+	trace_kvm_page_fault(gpa, exit_qualification);
 
 	/*
 	 * EPT violation happened while executing iret from NMI,
@@ -5341,31 +5340,9 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
 	 * AAK134, BY25.
 	 */
 	if (!(to_vmx(vcpu)->idt_vectoring_info & VECTORING_INFO_VALID_MASK) &&
-			enable_vnmi &&
-			(exit_qualification & INTR_INFO_UNBLOCK_NMI))
+	    enable_vnmi && (exit_qualification & INTR_INFO_UNBLOCK_NMI))
 		vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI);
 
-	gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
-	trace_kvm_page_fault(gpa, exit_qualification);
-
-	/* Is it a read fault? */
-	error_code = (exit_qualification & EPT_VIOLATION_ACC_READ)
-		     ? PFERR_USER_MASK : 0;
-	/* Is it a write fault? */
-	error_code |= (exit_qualification & EPT_VIOLATION_ACC_WRITE)
-		      ? PFERR_WRITE_MASK : 0;
-	/* Is it a fetch fault? */
-	error_code |= (exit_qualification & EPT_VIOLATION_ACC_INSTR)
-		      ? PFERR_FETCH_MASK : 0;
-	/* ept page table entry is present? */
-	error_code |= (exit_qualification &
-		       (EPT_VIOLATION_READABLE | EPT_VIOLATION_WRITABLE |
-			EPT_VIOLATION_EXECUTABLE))
-		      ? PFERR_PRESENT_MASK : 0;
-
-	error_code |= (exit_qualification & EPT_VIOLATION_GVA_TRANSLATED) != 0 ?
-	       PFERR_GUEST_FINAL_MASK : PFERR_GUEST_PAGE_MASK;
-
 	vcpu->arch.exit_qualification = exit_qualification;
 
 	/*
@@ -5379,7 +5356,7 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
 	if (unlikely(allow_smaller_maxphyaddr && kvm_vcpu_is_illegal_gpa(vcpu, gpa)))
 		return kvm_emulate_instruction(vcpu, 0);
 
-	return kvm_mmu_page_fault(vcpu, gpa, error_code, NULL, 0);
+	return __vmx_handle_ept_violation(vcpu, gpa, exit_qualification);
 }
 
 static int handle_ept_misconfig(struct kvm_vcpu *vcpu)
-- 
2.25.1