[PATCH 13/22] KVM: x86/mmu: pass struct kvm_pagewalk to kvm_mmu_invalidate_addr

[Paolo Bonzini]

kvm_mmu_invalidate_addr only needs to know if what's being invalidated
is a GVA or GPA.  This will ultimately be represented by two different
kvm_pagewalk structs, so adjust the type of the parameter.

For now the GVA case is represented by both root_mmu and nested_mmu.
Since nested_mmu never has a sync_spte callback, it would exit at its
check; but really nested_mmu should not be a kvm_mmu in the first place
and the container_of() would be bogus, so introduce a separate check
for whether the invalidation is happening for a nested GVA.  In that
case there's nothing needed beyond kvm_x86_call(flush_tlb_gva).

Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
 arch/x86/include/asm/kvm_host.h |  2 +-
 arch/x86/kvm/mmu/mmu.c          | 12 ++++++++----
 arch/x86/kvm/vmx/nested.c       |  2 +-
 arch/x86/kvm/x86.c              |  2 +-
 4 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 3172aaff6744..a1a09b59ac0b 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -2384,7 +2384,7 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
 		       void *insn, int insn_len);
 void kvm_mmu_print_sptes(struct kvm_vcpu *vcpu, gpa_t gpa, const char *msg);
 void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva);
-void kvm_mmu_invalidate_addr(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+void kvm_mmu_invalidate_addr(struct kvm_vcpu *vcpu, struct kvm_pagewalk *w,
 			     u64 addr, unsigned long roots);
 void kvm_mmu_invpcid_gva(struct kvm_vcpu *vcpu, gva_t gva, unsigned long pcid);
 void kvm_mmu_new_pgd(struct kvm_vcpu *vcpu, gpa_t new_pgd);
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index cc58b6157118..967c2226cba0 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6596,22 +6596,26 @@ static void __kvm_mmu_invalidate_addr(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu
 	write_unlock(&vcpu->kvm->mmu_lock);
 }
 
-void kvm_mmu_invalidate_addr(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+void kvm_mmu_invalidate_addr(struct kvm_vcpu *vcpu, struct kvm_pagewalk *w,
 			     u64 addr, unsigned long roots)
 {
+	struct kvm_mmu *mmu;
 	int i;
 
 	WARN_ON_ONCE(roots & ~KVM_MMU_ROOTS_ALL);
 
 	/* It's actually a GPA for vcpu->arch.guest_mmu.  */
-	if (mmu != &vcpu->arch.guest_mmu) {
+	if (w != &vcpu->arch.guest_mmu.w) {
 		/* INVLPG on a non-canonical address is a NOP according to the SDM.  */
 		if (is_noncanonical_invlpg_address(addr, vcpu))
 			return;
 
 		kvm_x86_call(flush_tlb_gva)(vcpu, addr);
+		if (w == &vcpu->arch.nested_mmu.w)
+			return;
 	}
 
+	mmu = container_of(w, struct kvm_mmu, w);
 	if (!mmu->sync_spte)
 		return;
 
@@ -6637,7 +6641,7 @@ void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva)
 	 * be synced when switching to that new cr3, so nothing needs to be
 	 * done here for them.
 	 */
-	kvm_mmu_invalidate_addr(vcpu, vcpu->arch.walk_mmu, gva, KVM_MMU_ROOTS_ALL);
+	kvm_mmu_invalidate_addr(vcpu, &vcpu->arch.walk_mmu->w, gva, KVM_MMU_ROOTS_ALL);
 	++vcpu->stat.invlpg;
 }
 EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_mmu_invlpg);
@@ -6659,7 +6663,7 @@ void kvm_mmu_invpcid_gva(struct kvm_vcpu *vcpu, gva_t gva, unsigned long pcid)
 	}
 
 	if (roots)
-		kvm_mmu_invalidate_addr(vcpu, mmu, gva, roots);
+		kvm_mmu_invalidate_addr(vcpu, &mmu->w, gva, roots);
 	++vcpu->stat.invlpg;
 
 	/*
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 50edd7ffac24..af773b4e008b 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -407,7 +407,7 @@ static void nested_ept_invalidate_addr(struct kvm_vcpu *vcpu, gpa_t eptp,
 			roots |= KVM_MMU_ROOT_PREVIOUS(i);
 	}
 	if (roots)
-		kvm_mmu_invalidate_addr(vcpu, vcpu->arch.mmu, addr, roots);
+		kvm_mmu_invalidate_addr(vcpu, &vcpu->arch.guest_mmu.w, addr, roots);
 }
 
 static void nested_ept_inject_page_fault(struct kvm_vcpu *vcpu,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c53d954e6367..c2de39ad7595 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1002,7 +1002,7 @@ void kvm_inject_emulated_page_fault(struct kvm_vcpu *vcpu,
 	 */
 	if ((fault->error_code & PFERR_PRESENT_MASK) &&
 	    !(fault->error_code & PFERR_RSVD_MASK))
-		kvm_mmu_invalidate_addr(vcpu, fault_mmu, fault->address,
+		kvm_mmu_invalidate_addr(vcpu, &fault_mmu->w, fault->address,
 					KVM_MMU_ROOT_CURRENT);
 
 	fault_mmu->w.inject_page_fault(vcpu, fault);
-- 
2.52.0