linux-kernel - [PATCH 3/4] x86/kvm/mmu.c: add kvm_mmu parameter to kvm_mmu_free

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Message-Id: <1532710601-45449-4-git-send-email-pbonzini@redhat.com>
Date:   Fri, 27 Jul 2018 18:56:40 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     vkuznets@...hat.com
Subject: [PATCH 3/4] x86/kvm/mmu.c: add kvm_mmu parameter to kvm_mmu_free_roots()

From: Vitaly Kuznetsov <vkuznets@...hat.com>

Add an option to specify which MMU root we want to free. This will
be used when nested and non-nested MMUs for L1 are split.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/include/asm/kvm_host.h | 3 ++-
 arch/x86/kvm/mmu.c              | 9 +++++----
 arch/x86/kvm/vmx.c              | 2 +-
 3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 7ae8ae58f3bd..7b157cd43e1f 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1325,7 +1325,8 @@ static inline int __kvm_irq_line_state(unsigned long *irq_state,
 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu);
-void kvm_mmu_free_roots(struct kvm_vcpu *vcpu, ulong roots_to_free);
+void kvm_mmu_free_roots(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+			ulong roots_to_free);
 gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access,
 			   struct x86_exception *exception);
 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva,
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index b013aec73d46..1bcab6f9d1c8 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3435,11 +3435,11 @@ static void mmu_free_root_page(struct kvm *kvm, hpa_t *root_hpa,
 }
 
 /* roots_to_free must be some combination of the KVM_MMU_ROOT_* flags */
-void kvm_mmu_free_roots(struct kvm_vcpu *vcpu, ulong roots_to_free)
+void kvm_mmu_free_roots(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+			ulong roots_to_free)
 {
 	int i;
 	LIST_HEAD(invalid_list);
-	struct kvm_mmu *mmu = vcpu->arch.mmu;
 	bool free_active_root = roots_to_free & KVM_MMU_ROOT_CURRENT;
 
 	BUILD_BUG_ON(KVM_MMU_NUM_PREV_ROOTS >= BITS_PER_LONG);
@@ -4154,7 +4154,8 @@ static void __kvm_mmu_new_cr3(struct kvm_vcpu *vcpu, gpa_t new_cr3,
 			      bool skip_tlb_flush)
 {
 	if (!fast_cr3_switch(vcpu, new_cr3, new_role, skip_tlb_flush))
-		kvm_mmu_free_roots(vcpu, KVM_MMU_ROOT_CURRENT);
+		kvm_mmu_free_roots(vcpu, vcpu->arch.mmu,
+				   KVM_MMU_ROOT_CURRENT);
 }
 
 void kvm_mmu_new_cr3(struct kvm_vcpu *vcpu, gpa_t new_cr3, bool skip_tlb_flush)
@@ -4936,7 +4937,7 @@ int kvm_mmu_load(struct kvm_vcpu *vcpu)
 
 void kvm_mmu_unload(struct kvm_vcpu *vcpu)
 {
-	kvm_mmu_free_roots(vcpu, KVM_MMU_ROOTS_ALL);
+	kvm_mmu_free_roots(vcpu, vcpu->arch.mmu, KVM_MMU_ROOTS_ALL);
 	WARN_ON(VALID_PAGE(vcpu->arch.mmu->root_hpa));
 }
 EXPORT_SYMBOL_GPL(kvm_mmu_unload);
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 3ee8137b2026..362842f9b523 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -8893,7 +8893,7 @@ static int handle_invpcid(struct kvm_vcpu *vcpu)
 			    == operand.pcid)
 				roots_to_free |= KVM_MMU_ROOT_PREVIOUS(i);
 
-		kvm_mmu_free_roots(vcpu, roots_to_free);
+		kvm_mmu_free_roots(vcpu, vcpu->arch.mmu, roots_to_free);
 		/*
 		 * If neither the current cr3 nor any of the prev_roots use the
 		 * given PCID, then nothing needs to be done here because a
-- 
1.8.3.1