linux-kernel - [PATCH 08/10] KVM: introduce readonly_bad

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Date:	Tue, 17 Jul 2012 22:45:07 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: [PATCH 08/10] KVM: introduce readonly_bad_hva

In the later patch, it indicates failure when we try to get a writable
hva from the readonly slot

Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
---
 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

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