linux-kernel - [PATCH v2 6/10] KVM: MMU: introduce gfn_to_hva

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Message-ID: <4C249BD5.4040208@cn.fujitsu.com>
Date:	Fri, 25 Jun 2010 20:06:45 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>
Subject: [PATCH v2 6/10] KVM: MMU: introduce gfn_to_hva_many() function

This function not only return the gfn's hva but also the page number
after @gfn in the slot

It's used in the later patch

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
 include/linux/kvm_host.h |    1 +
 virt/kvm/kvm_main.c      |   13 ++++++++++++-
 2 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 515fefd..8f7af32 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -289,6 +289,7 @@ void kvm_disable_largepages(void);
 void kvm_arch_flush_shadow(struct kvm *kvm);
 
 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
+unsigned long gfn_to_hva_many(struct kvm *kvm, gfn_t gfn, int *entry);
 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
 void kvm_release_page_clean(struct page *page);
 void kvm_release_page_dirty(struct page *page);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 60bb3d5..a007889 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -913,15 +913,26 @@ static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
 	return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
 }
 
-unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
+unsigned long gfn_to_hva_many(struct kvm *kvm, gfn_t gfn, int *entry)
 {
 	struct kvm_memory_slot *slot;
 
 	slot = gfn_to_memslot(kvm, gfn);
+
 	if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
 		return bad_hva();
+
+	if (entry)
+		*entry = slot->npages - (gfn - slot->base_gfn);
+
 	return gfn_to_hva_memslot(slot, gfn);
 }
+EXPORT_SYMBOL_GPL(gfn_to_hva_many);
+
+unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
+{
+	return gfn_to_hva_many(kvm, gfn, NULL);
+}
 EXPORT_SYMBOL_GPL(gfn_to_hva);
 
 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic)
-- 
1.6.1.2



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