From 417726a3fbecb2092f1054bbaee87bc442b05ef3 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Thu, 12 Apr 2007 17:35:58 +0300 Subject: [PATCH] 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: Avi Kivity --- drivers/kvm/mmu.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c index 8bdb9ca1811c..9ff74805c7d1 100644 --- a/drivers/kvm/mmu.c +++ b/drivers/kvm/mmu.c @@ -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]; - ASSERT(VALID_PAGE(root)); - root &= PT64_BASE_ADDR_MASK; - page = page_header(root); - --page->root_count; + 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), -- 2.30.2