Messages in this thread Patch in this message | | | From | Avi Kivity <> | Subject | [PATCH 04/18] KVM: Handle partial pae pdptr | Date | Thu, 26 Apr 2007 12:22:04 +0300 |
| |
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 <avi@qumranet.com> --- drivers/kvm/mmu.c | 18 ++++++++++++------ 1 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c index 8bdb9ca..9ff7480 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), -- 1.5.0.6 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |