KVM: x86: introduce kvm_mmu_invalidate_gva

Wrap the combination of mmu->invlpg and kvm_x86_ops->tlb_flush_gva
into a new function.  This function also lets us specify the host PGD to
invalidate and also the MMU, both of which will be useful in fixing and
simplifying kvm_inject_emulated_page_fault.

A nested guest's MMU however has g_context->invlpg == NULL.  Instead of
setting it to nonpaging_invlpg, make kvm_mmu_invalidate_gva the only
entry point to mmu->invlpg and make a NULL invlpg pointer equivalent
to nonpaging_invlpg, saving a retpoline.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/kvm_host.h

@@ -1511,6 +1511,8 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 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_invlpg(struct kvm_vcpu *vcpu, gva_t gva);
+void kvm_mmu_invalidate_gva(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+			    gva_t gva, hpa_t root_hpa);
 void kvm_mmu_invpcid_gva(struct kvm_vcpu *vcpu, gva_t gva, unsigned long pcid);
 void kvm_mmu_new_cr3(struct kvm_vcpu *vcpu, gpa_t new_cr3, bool skip_tlb_flush);
 

arch/x86/kvm/mmu/mmu.c

@@ -2153,10 +2153,6 @@ static int nonpaging_sync_page(struct kvm_vcpu *vcpu,
 	return 0;
 }
 
-static void nonpaging_invlpg(struct kvm_vcpu *vcpu, gva_t gva, hpa_t root)
-{
-}
-
 static void nonpaging_update_pte(struct kvm_vcpu *vcpu,
 				 struct kvm_mmu_page *sp, u64 *spte,
 				 const void *pte)
@@ -4237,7 +4233,7 @@ static void nonpaging_init_context(struct kvm_vcpu *vcpu,
 	context->page_fault = nonpaging_page_fault;
 	context->gva_to_gpa = nonpaging_gva_to_gpa;
 	context->sync_page = nonpaging_sync_page;
-	context->invlpg = nonpaging_invlpg;
+	context->invlpg = NULL;
 	context->update_pte = nonpaging_update_pte;
 	context->root_level = 0;
 	context->shadow_root_level = PT32E_ROOT_LEVEL;
@@ -4928,7 +4924,7 @@ static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
 	context->mmu_role.as_u64 = new_role.as_u64;
 	context->page_fault = kvm_tdp_page_fault;
 	context->sync_page = nonpaging_sync_page;
-	context->invlpg = nonpaging_invlpg;
+	context->invlpg = NULL;
 	context->update_pte = nonpaging_update_pte;
 	context->shadow_root_level = kvm_x86_ops.get_tdp_level(vcpu);
 	context->direct_map = true;
@@ -5096,6 +5092,12 @@ static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu)
 	g_context->get_pdptr         = kvm_pdptr_read;
 	g_context->inject_page_fault = kvm_inject_page_fault;
 
+	/*
+	 * L2 page tables are never shadowed, so there is no need to sync
+	 * SPTEs.
+	 */
+	g_context->invlpg            = NULL;
+
 	/*
 	 * Note that arch.mmu->gva_to_gpa translates l2_gpa to l1_gpa using
 	 * L1's nested page tables (e.g. EPT12). The nested translation
@@ -5497,15 +5499,24 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
 }
 EXPORT_SYMBOL_GPL(kvm_mmu_page_fault);
 
-void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva)
+void kvm_mmu_invalidate_gva(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+			    gva_t gva, hpa_t root_hpa)
 {
-	struct kvm_mmu *mmu = vcpu->arch.mmu;
 	int i;
 
-	/* INVLPG on a * non-canonical address is a NOP according to the SDM.  */
+	/* It's actually a GPA for vcpu->arch.guest_mmu.  */
+	if (mmu != &vcpu->arch.guest_mmu) {
+		/* INVLPG on a non-canonical address is a NOP according to the SDM.  */
 		if (is_noncanonical_address(gva, vcpu))
 			return;
 
+		kvm_x86_ops.tlb_flush_gva(vcpu, gva);
+	}
+
+	if (!mmu->invlpg)
+		return;
+
+	if (root_hpa == INVALID_PAGE) {
 		mmu->invlpg(vcpu, gva, mmu->root_hpa);
 
 		/*
@@ -5522,12 +5533,20 @@ void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva)
 		for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++)
 			if (VALID_PAGE(mmu->prev_roots[i].hpa))
 				mmu->invlpg(vcpu, gva, mmu->prev_roots[i].hpa);
+	} else {
+		mmu->invlpg(vcpu, gva, root_hpa);
+	}
+}
+EXPORT_SYMBOL_GPL(kvm_mmu_invalidate_gva);
 
-	kvm_x86_ops.tlb_flush_gva(vcpu, gva);
+void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva)
+{
+	kvm_mmu_invalidate_gva(vcpu, vcpu->arch.mmu, gva, INVALID_PAGE);
 	++vcpu->stat.invlpg;
 }
 EXPORT_SYMBOL_GPL(kvm_mmu_invlpg);
 
+
 void kvm_mmu_invpcid_gva(struct kvm_vcpu *vcpu, gva_t gva, unsigned long pcid)
 {
 	struct kvm_mmu *mmu = vcpu->arch.mmu;