Commit 9034e6e8 authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Radim Krčmář
Browse files

KVM: x86: fix use of L1 MMIO areas in nested guests 



There is currently some confusion between nested and L1 GPAs.  The
assignment to "direct" in kvm_mmu_page_fault tries to fix that, but
it is not enough.  What this patch does is fence off the MMIO cache
completely when using shadow nested page tables, since we have neither
a GVA nor an L1 GPA to put in the cache.  This also allows some
simplifications in kvm_mmu_page_fault and FNAME(page_fault).

The EPT misconfig likewise does not have an L1 GPA to pass to
kvm_io_bus_write, so that must be skipped for guest mode.

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
[Changed comment to say "GPAs" instead of "L1's physical addresses", as
 per David's review. - Radim]
Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
parent 618232e2

arch/x86/kvm/mmu.c

+8 −1
Original line number Diff line number Diff line
@@ -3596,6 +3596,13 @@ static bool is_shadow_zero_bits_set(struct kvm_mmu *mmu, u64 spte, int level) 


static bool mmio_info_in_cache(struct kvm_vcpu *vcpu, u64 addr, bool direct)

{

	/*

	 * A nested guest cannot use the MMIO cache if it is using nested

	 * page tables, because cr2 is a nGPA while the cache stores GPAs.

	 */

	if (mmu_is_nested(vcpu))

		return false;



	if (direct)

		return vcpu_match_mmio_gpa(vcpu, addr);
@@ -4841,7 +4848,7 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u64 error_code, 
{

	int r, emulation_type = EMULTYPE_RETRY;

	enum emulation_result er;

	bool direct = vcpu->arch.mmu.direct_map || mmu_is_nested(vcpu);

	bool direct = vcpu->arch.mmu.direct_map;



	/* With shadow page tables, fault_address contains a GVA or nGPA.  */

	if (vcpu->arch.mmu.direct_map) {

arch/x86/kvm/paging_tmpl.h

+1 −2
Original line number Diff line number Diff line
@@ -790,8 +790,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code, 
			 &map_writable))

		return 0;



	if (handle_abnormal_pfn(vcpu, mmu_is_nested(vcpu) ? 0 : addr,

				walker.gfn, pfn, walker.pte_access, &r))

	if (handle_abnormal_pfn(vcpu, addr, walker.gfn, pfn, walker.pte_access, &r))

		return r;



	/*

arch/x86/kvm/vmx.c

+6 −1
Original line number Diff line number Diff line
@@ -6402,8 +6402,13 @@ static int handle_ept_misconfig(struct kvm_vcpu *vcpu) 
	int ret;

	gpa_t gpa;



	/*

	 * A nested guest cannot optimize MMIO vmexits, because we have an

	 * nGPA here instead of the required GPA.

	 */

	gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);

	if (!kvm_io_bus_write(vcpu, KVM_FAST_MMIO_BUS, gpa, 0, NULL)) {

	if (!is_guest_mode(vcpu) &&

	    !kvm_io_bus_write(vcpu, KVM_FAST_MMIO_BUS, gpa, 0, NULL)) {

		trace_kvm_fast_mmio(gpa);

		return kvm_skip_emulated_instruction(vcpu);

	}

arch/x86/kvm/x86.h

+5 −1
Original line number Diff line number Diff line
@@ -90,7 +90,11 @@ static inline u32 bit(int bitno) 
static inline void vcpu_cache_mmio_info(struct kvm_vcpu *vcpu,

					gva_t gva, gfn_t gfn, unsigned access)

{

	vcpu->arch.mmio_gva = gva & PAGE_MASK;

	/*

	 * If this is a shadow nested page table, the "GVA" is

	 * actually a nGPA.

	 */

	vcpu->arch.mmio_gva = mmu_is_nested(vcpu) ? 0 : gva & PAGE_MASK;

	vcpu->arch.access = access;

	vcpu->arch.mmio_gfn = gfn;

	vcpu->arch.mmio_gen = kvm_memslots(vcpu->kvm)->generation;

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