Commit 417726a3 authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: Handle partial pae pdptr 



Some guests (Solaris) do not set up all four pdptrs, but leave some invalid.
kvm incorrectly treated these as valid page directories, pinning the
wrong pages and causing general confusion.

Fix by checking the valid bit of a pae pdpte.  This closes sourceforge bug
1698922.

Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent d917a6b9

drivers/kvm/mmu.c

+12 −6
Original line number Diff line number Diff line
@@ -806,10 +806,12 @@ static void mmu_free_roots(struct kvm_vcpu *vcpu) 
	for (i = 0; i < 4; ++i) {

		hpa_t root = vcpu->mmu.pae_root[i];



		if (root) {

			ASSERT(VALID_PAGE(root));

			root &= PT64_BASE_ADDR_MASK;

			page = page_header(root);

			--page->root_count;

		}

		vcpu->mmu.pae_root[i] = INVALID_PAGE;

	}

	vcpu->mmu.root_hpa = INVALID_PAGE;
@@ -840,9 +842,13 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu) 
		hpa_t root = vcpu->mmu.pae_root[i];



		ASSERT(!VALID_PAGE(root));

		if (vcpu->mmu.root_level == PT32E_ROOT_LEVEL)

		if (vcpu->mmu.root_level == PT32E_ROOT_LEVEL) {

			if (!is_present_pte(vcpu->pdptrs[i])) {

				vcpu->mmu.pae_root[i] = 0;

				continue;

			}

			root_gfn = vcpu->pdptrs[i] >> PAGE_SHIFT;

		else if (vcpu->mmu.root_level == 0)

		} else if (vcpu->mmu.root_level == 0)

			root_gfn = 0;

		page = kvm_mmu_get_page(vcpu, root_gfn, i << 30,

					PT32_ROOT_LEVEL, !is_paging(vcpu),

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