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KVM: Simply gfn_to_page()

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Mapping a guest page to a host page is a common operation.  Currently,
one has first to find the memory slot where the page belongs (gfn_to_memslot),
then locate the page itself (gfn_to_page()).

This is clumsy, and also won't work well with memory aliases.  So simplify
gfn_to_page() not to require memory slot translation first, and instead do it
internally.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity
2007-03-30 14:02:32 +03:00
parent e0fa826f96
commit 954bbbc236
4 changed files with 33 additions and 42 deletions
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12
drivers/kvm/mmu.c
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@@ -390,13 +390,11 @@ static void rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn)
{
struct kvm *kvm = vcpu->kvm;
struct page *page;
struct kvm_memory_slot *slot;
struct kvm_rmap_desc *desc;
u64 *spte;
slot = gfn_to_memslot(kvm, gfn);
BUG_ON(!slot);
page = gfn_to_page(slot, gfn);
page = gfn_to_page(kvm, gfn);
BUG_ON(!page);
while (page_private(page)) {
if (!(page_private(page) & 1))
@@ -711,14 +709,12 @@ hpa_t safe_gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa)
hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa)
{
struct kvm_memory_slot *slot;
struct page *page;
ASSERT((gpa & HPA_ERR_MASK) == 0);
slot = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
if (!slot)
page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
if (!page)
return gpa | HPA_ERR_MASK;
page = gfn_to_page(slot, gpa >> PAGE_SHIFT);
return ((hpa_t)page_to_pfn(page) << PAGE_SHIFT)
| (gpa & (PAGE_SIZE-1));
}