Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757183AbYLHLtA (ORCPT ); Mon, 8 Dec 2008 06:49:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753852AbYLHLi3 (ORCPT ); Mon, 8 Dec 2008 06:38:29 -0500 Received: from mx2.redhat.com ([66.187.237.31]:48245 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753287AbYLHLhE (ORCPT ); Mon, 8 Dec 2008 06:37:04 -0500 From: Avi Kivity To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Sheng Yang Subject: [PATCH 23/45] KVM: MMU: Extend kvm_mmu_page->slot_bitmap size Date: Mon, 8 Dec 2008 13:36:34 +0200 Message-Id: <1228736216-15787-24-git-send-email-avi@redhat.com> In-Reply-To: <1228736216-15787-1-git-send-email-avi@redhat.com> References: <1228736216-15787-1-git-send-email-avi@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2500 Lines: 70 From: Sheng Yang Otherwise set_bit() for private memory slot(above KVM_MEMORY_SLOTS) would corrupted memory in 32bit host. Signed-off-by: Sheng Yang Signed-off-by: Avi Kivity --- arch/x86/include/asm/kvm_host.h | 8 +++++--- arch/x86/kvm/mmu.c | 6 +++--- 2 files changed, 8 insertions(+), 6 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 93040b5..59c3ae1 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -192,9 +192,11 @@ struct kvm_mmu_page { u64 *spt; /* hold the gfn of each spte inside spt */ gfn_t *gfns; - unsigned long slot_bitmap; /* One bit set per slot which has memory - * in this shadow page. - */ + /* + * One bit set per slot which has memory + * in this shadow page. + */ + DECLARE_BITMAP(slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS); int multimapped; /* More than one parent_pte? */ int root_count; /* Currently serving as active root */ bool unsync; diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 09d05f5..8687758 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -789,7 +789,7 @@ static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, set_page_private(virt_to_page(sp->spt), (unsigned long)sp); list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages); ASSERT(is_empty_shadow_page(sp->spt)); - sp->slot_bitmap = 0; + bitmap_zero(sp->slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS); sp->multimapped = 0; sp->parent_pte = parent_pte; --vcpu->kvm->arch.n_free_mmu_pages; @@ -1364,7 +1364,7 @@ static void page_header_update_slot(struct kvm *kvm, void *pte, gfn_t gfn) int slot = memslot_id(kvm, gfn_to_memslot(kvm, gfn)); struct kvm_mmu_page *sp = page_header(__pa(pte)); - __set_bit(slot, &sp->slot_bitmap); + __set_bit(slot, sp->slot_bitmap); } static void mmu_convert_notrap(struct kvm_mmu_page *sp) @@ -2564,7 +2564,7 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot) int i; u64 *pt; - if (!test_bit(slot, &sp->slot_bitmap)) + if (!test_bit(slot, sp->slot_bitmap)) continue; pt = sp->spt; -- 1.6.0.3 -- 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/