From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755403AbXLZLX6 (ORCPT ); Wed, 26 Dec 2007 06:23:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752646AbXLZLHM (ORCPT ); Wed, 26 Dec 2007 06:07:12 -0500 Received: from il.qumranet.com ([82.166.9.18]:50473 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751957AbXLZLGJ (ORCPT ); Wed, 26 Dec 2007 06:06:09 -0500 From: Avi Kivity To: linux-kernel@vger.kernel.org, kvm-devel@lists.sourceforge.net Cc: Izik Eidus Subject: [PATCH 44/55] KVM: add kvm_is_error_hva() Date: Wed, 26 Dec 2007 13:05:49 +0200 Message-Id: <1198667160-22953-45-git-send-email-avi@qumranet.com> X-Mailer: git-send-email 1.5.3.7 In-Reply-To: <1198667160-22953-1-git-send-email-avi@qumranet.com> References: <1198667160-22953-1-git-send-email-avi@qumranet.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Izik Eidus Check for the "error hva", an address outside the user address space that signals a bad gfn. Signed-off-by: Izik Eidus Signed-off-by: Avi Kivity --- drivers/kvm/kvm.h | 1 + drivers/kvm/kvm_main.c | 11 +++++++++++ 2 files changed, 12 insertions(+), 0 deletions(-) diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h index 3f5ffc3..6498324 100644 --- a/drivers/kvm/kvm.h +++ b/drivers/kvm/kvm.h @@ -520,6 +520,7 @@ struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva); extern struct page *bad_page; int is_error_page(struct page *page); +int kvm_is_error_hva(unsigned long addr); int kvm_set_memory_region(struct kvm *kvm, struct kvm_userspace_memory_region *mem, int user_alloc); diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index dacdc66..e3c7f3b 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -498,6 +498,17 @@ int is_error_page(struct page *page) } EXPORT_SYMBOL_GPL(is_error_page); +static inline unsigned long bad_hva(void) +{ + return PAGE_OFFSET; +} + +int kvm_is_error_hva(unsigned long addr) +{ + return addr == bad_hva(); +} +EXPORT_SYMBOL_GPL(kvm_is_error_hva); + gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn) { int i; -- 1.5.3.7