From 0b49ea8659fd3b5005823e02d2d0a775521770e5 Mon Sep 17 00:00:00 2001
From: Avi Kivity <avi@qumranet.com>
Date: Sun, 23 Mar 2008 15:06:23 +0200
Subject: [PATCH] KVM: MMU: Introduce and use spte_to_page()
Encapsulate the pte mask'n'shift in a function.
Signed-off-by: Avi Kivity <avi@qumranet.com>
---
arch/x86/kvm/mmu.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index dd4b95b3896b..6fc342194dda 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -240,6 +240,13 @@ static int is_rmap_pte(u64 pte)
return is_shadow_present_pte(pte);
}
+static struct page *spte_to_page(u64 pte)
+{
+ hfn_t hfn = (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
+
+ return pfn_to_page(hfn);
+}
+
static gfn_t pse36_gfn_delta(u32 gpte)
{
int shift = 32 - PT32_DIR_PSE36_SHIFT - PAGE_SHIFT;
@@ -541,7 +548,7 @@ static void rmap_remove(struct kvm *kvm, u64 *spte)
if (!is_rmap_pte(*spte))
return;
sp = page_header(__pa(spte));
- page = pfn_to_page((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT);
+ page = spte_to_page(*spte);
mark_page_accessed(page);
if (is_writeble_pte(*spte))
kvm_release_page_dirty(page);
@@ -630,7 +637,7 @@ static void rmap_write_protect(struct kvm *kvm, u64 gfn)
struct page *page;
spte = rmap_next(kvm, rmapp, NULL);
- page = pfn_to_page((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT);
+ page = spte_to_page(*spte);
SetPageDirty(page);
}
@@ -1033,7 +1040,6 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
u64 spte;
int was_rmapped = 0;
int was_writeble = is_writeble_pte(*shadow_pte);
- hfn_t host_pfn = (*shadow_pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
pgprintk("%s: spte %llx access %x write_fault %d"
" user_fault %d gfn %lx\n",
@@ -1051,9 +1057,10 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
child = page_header(pte & PT64_BASE_ADDR_MASK);
mmu_page_remove_parent_pte(child, shadow_pte);
- } else if (host_pfn != page_to_pfn(page)) {
+ } else if (page != spte_to_page(*shadow_pte)) {
pgprintk("hfn old %lx new %lx\n",
- host_pfn, page_to_pfn(page));
+ page_to_pfn(spte_to_page(*shadow_pte)),
+ page_to_pfn(page));
rmap_remove(vcpu->kvm, shadow_pte);
} else {
if (largepage)
--
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