linux-kernel - [PATCH v2 09/11] KVM: SVM: introduce svm_need_pf

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Message-Id: <20200619153925.79106-10-mgamal@redhat.com>
Date:   Fri, 19 Jun 2020 17:39:23 +0200
From:   Mohammed Gamal <mgamal@...hat.com>
To:     kvm@...r.kernel.org, pbonzini@...hat.com
Cc:     linux-kernel@...r.kernel.org, vkuznets@...hat.com,
        sean.j.christopherson@...el.com, wanpengli@...cent.com,
        jmattson@...gle.com, joro@...tes.org, thomas.lendacky@....com,
        babu.moger@....com, Mohammed Gamal <mgamal@...hat.com>
Subject: [PATCH v2 09/11] KVM: SVM: introduce svm_need_pf_intercept

CC: Tom Lendacky <thomas.lendacky@....com>
CC: Babu Moger <babu.moger@....com>
Signed-off-by: Mohammed Gamal <mgamal@...hat.com>
---
 arch/x86/kvm/svm/svm.c | 8 ++++++++
 arch/x86/kvm/svm/svm.h | 6 ++++++
 2 files changed, 14 insertions(+)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 94108e6cc6da..05412818027d 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -1087,6 +1087,9 @@ static void init_vmcb(struct vcpu_svm *svm)
 	}
 	svm->asid_generation = 0;
 
+	if (svm_need_pf_intercept(svm))
+		set_exception_intercept(svm, PF_VECTOR);
+
 	svm->nested.vmcb = 0;
 	svm->vcpu.arch.hflags = 0;
 
@@ -1633,6 +1636,11 @@ static void update_exception_bitmap(struct kvm_vcpu *vcpu)
 
 	clr_exception_intercept(svm, BP_VECTOR);
 
+	if (svm_need_pf_intercept(svm))
+		set_exception_intercept(svm, PF_VECTOR);
+	else
+		clr_exception_intercept(svm, PF_VECTOR);
+
 	if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
 		if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
 			set_exception_intercept(svm, BP_VECTOR);
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 6ac4c00a5d82..2b7469f3db0e 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -19,6 +19,7 @@
 #include <linux/kvm_host.h>
 
 #include <asm/svm.h>
+#include "cpuid.h"
 
 static const u32 host_save_user_msrs[] = {
 #ifdef CONFIG_X86_64
@@ -345,6 +346,11 @@ static inline bool gif_set(struct vcpu_svm *svm)
 		return !!(svm->vcpu.arch.hflags & HF_GIF_MASK);
 }
 
+static inline bool svm_need_pf_intercept(struct vcpu_svm *svm)
+{
+        return !npt_enabled;
+}
+
 /* svm.c */
 #define MSR_INVALID			0xffffffffU
 
-- 
2.26.2