From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiao Guangrong Subject: [PATCH 08/10] KVM: introduce readonly_bad_hva Date: Tue, 17 Jul 2012 22:45:07 +0800 Message-ID: <50057A73.40005@linux.vnet.ibm.com> References: <5005791B.8040807@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Avi Kivity , Marcelo Tosatti , LKML , KVM To: Xiao Guangrong Return-path: In-Reply-To: <5005791B.8040807@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org In the later patch, it indicates failure when we try to get a writable hva from the readonly slot Signed-off-by: Xiao Guangrong --- virt/kvm/kvm_main.c | 12 +++++++++++- 1 files changed, 11 insertions(+), 1 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index b70f1a4..c056736 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -994,9 +994,19 @@ static inline unsigned long bad_hva(void) return PAGE_OFFSET; } +static inline unsigned long readonly_bad_hva(void) +{ + return PAGE_OFFSET + PAGE_SIZE; +} + +static int kvm_is_readonly_bad_hva(unsigned long addr) +{ + return addr == readonly_bad_hva(); +} + int kvm_is_error_hva(unsigned long addr) { - return addr == bad_hva(); + return addr == bad_hva() || kvm_is_readonly_bad_hva(addr); } EXPORT_SYMBOL_GPL(kvm_is_error_hva); -- 1.7.7.6