Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759179Ab0G3R0Y (ORCPT ); Fri, 30 Jul 2010 13:26:24 -0400 Received: from kroah.org ([198.145.64.141]:52148 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758865Ab0G3RUC (ORCPT ); Fri, 30 Jul 2010 13:20:02 -0400 X-Mailbox-Line: From gregkh@clark.site Fri Jul 30 10:15:12 2010 Message-Id: <20100730171511.969646411@clark.site> User-Agent: quilt/0.48-11.2 Date: Fri, 30 Jul 2010 10:16:04 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Marcelo Tosatti , Avi Kivity Subject: [136/165] KVM: MMU: invalidate and flush on spte small->large page size change In-Reply-To: <20100730171550.GA1299@kroah.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1386 Lines: 40 2.6.32-stable review patch. If anyone has any objections, please let us know. ------------------ Always invalidate spte and flush TLBs when changing page size, to make sure different sized translations for the same address are never cached in a CPU's TLB. Currently the only case where this occurs is when a non-leaf spte pointer is overwritten by a leaf, large spte entry. This can happen after dirty logging is disabled on a memslot, for example. Noticed by Andrea. KVM-Stable-Tag Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity (cherry picked from commit 3be2264be3c00865116f997dc53ebcc90fe7fc4b) --- arch/x86/kvm/mmu.c | 2 ++ 1 file changed, 2 insertions(+) --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1901,6 +1901,8 @@ static void mmu_set_spte(struct kvm_vcpu child = page_header(pte & PT64_BASE_ADDR_MASK); mmu_page_remove_parent_pte(child, sptep); + __set_spte(sptep, shadow_trap_nonpresent_pte); + kvm_flush_remote_tlbs(vcpu->kvm); } else if (pfn != spte_to_pfn(*sptep)) { pgprintk("hfn old %lx new %lx\n", spte_to_pfn(*sptep), pfn); -- 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/