linux-kernel - [PATCH 2/4] PF: Move architecture specifics to the backends

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Date:	Mon, 10 Jun 2013 14:03:46 +0200
From:	Dominik Dingel <dingel@...ux.vnet.ibm.com>
To:	Gleb Natapov <gleb@...hat.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	kvm@...r.kernel.org, linux-s390@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Dominik Dingel <dingel@...ux.vnet.ibm.com>
Subject: [PATCH 2/4] PF: Move architecture specifics to the backends

Current common code use PAGE_OFFSET to indicate a bad host virtual address.
This works for x86 but not necessarily on other architectures. So the check
is moved into architecture specific code.

Todo:
 - apply to other architectures when applicable

Signed-off-by: Dominik Dingel <dingel@...ux.vnet.ibm.com>
---
 arch/s390/include/asm/kvm_host.h | 12 ++++++++++++
 arch/x86/include/asm/kvm_host.h  |  8 ++++++++
 include/linux/kvm_host.h         |  8 --------
 3 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index deb1990..e014bba 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -277,6 +277,18 @@ struct kvm_arch{
 	int css_support;
 };
 
+#define KVM_HVA_ERR_BAD		(-1UL)
+#define KVM_HVA_ERR_RO_BAD	(-1UL)
+
+static inline bool kvm_is_error_hva(unsigned long addr)
+{
+	/*
+	 * on s390, this check is not needed as kernel and user memory
+	 * is not mapped into the same address space
+	 */
+	return false;
+}
+
 extern int sie64a(struct kvm_s390_sie_block *, u64 *);
 extern unsigned long sie_exit_addr;
 #endif
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 4979778..5ed7c83 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -94,6 +94,14 @@
 
 #define ASYNC_PF_PER_VCPU 64
 
+#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;
+}
+
 extern raw_spinlock_t kvm_lock;
 extern struct list_head vm_list;
 
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index c139582..9bd29ef 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -84,14 +84,6 @@ static inline bool is_noslot_pfn(pfn_t pfn)
 	return pfn == KVM_PFN_NOSLOT;
 }
 
-#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;
-}
-
 #define KVM_ERR_PTR_BAD_PAGE	(ERR_PTR(-ENOENT))
 
 static inline bool is_error_page(struct page *page)
-- 
1.8.1.6

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