Commit 5efac074 authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

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: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 53b3d8e9

arch/x86/include/asm/kvm_host.h

+2 −0
Original line number Diff line number Diff line
@@ -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

+45 −26
Original line number Diff line number Diff line
@@ -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 @@ emulate: 
}

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;

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