linux-kernel - [PATCH v6 10/12] KVM: introduce KVM_HVA_ERR_RO

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Date:	Tue, 21 Aug 2012 11:02:22 +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 v6 10/12] KVM: introduce KVM_HVA_ERR_RO_BAD

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

Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
---
 include/linux/kvm_host.h |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index b9bba60..a913ac7 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -82,11 +82,12 @@ static inline bool is_invalid_pfn(pfn_t pfn)
 	return !is_noslot_pfn(pfn) && is_error_pfn(pfn);
 }

-#define KVM_HVA_ERR_BAD	(PAGE_OFFSET)
+#define KVM_HVA_ERR_BAD		(PAGE_OFFSET)
+#define KVM_HVA_ERR_RO_BAD	(PAGE_OFFSET + PAGE_SIZE)

 static inline bool kvm_is_error_hva(unsigned long addr)
 {
-	return addr == PAGE_OFFSET;
+	return addr >= PAGE_OFFSET;
 }

 #define KVM_ERR_PTR_BAD_PAGE	(ERR_PTR(-ENOENT))
-- 
1.7.7.6

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