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>
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index dd4b95b..6fc3421 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -240,6 +240,13 @@
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 @@
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 @@
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 @@
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 @@
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)