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KVM: introduce gfn_to_pfn_memslot

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Which takes a memslot pointer instead of using kvm->memslots.

To be used by SRCU convertion later.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Marcelo Tosatti 2009-12-23 14:35:19 -02:00
parent f7784b8ec9
commit 506f0d6f9c
2 changed files with 27 additions and 8 deletions
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2
include/linux/kvm_host.h
View file

@ -273,6 +273,8 @@ void kvm_set_page_dirty(struct page *page);
void kvm_set_page_accessed(struct page *page); void kvm_set_page_accessed(struct page *page);
pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn); pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
struct kvm_memory_slot *slot, gfn_t gfn);
void kvm_release_pfn_dirty(pfn_t); void kvm_release_pfn_dirty(pfn_t);
void kvm_release_pfn_clean(pfn_t pfn); void kvm_release_pfn_clean(pfn_t pfn);
void kvm_set_pfn_dirty(pfn_t pfn); void kvm_set_pfn_dirty(pfn_t pfn);

33
virt/kvm/kvm_main.c
View file

@ -835,21 +835,14 @@ unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
} }
EXPORT_SYMBOL_GPL(gfn_to_hva); EXPORT_SYMBOL_GPL(gfn_to_hva);
pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr)
{ {
struct page *page[1]; struct page *page[1];
unsigned long addr;
int npages; int npages;
pfn_t pfn; pfn_t pfn;
might_sleep(); might_sleep();
addr = gfn_to_hva(kvm, gfn);
if (kvm_is_error_hva(addr)) {
get_page(bad_page);
return page_to_pfn(bad_page);
}
npages = get_user_pages_fast(addr, 1, 1, page); npages = get_user_pages_fast(addr, 1, 1, page);
if (unlikely(npages != 1)) { if (unlikely(npages != 1)) {
@ -874,8 +867,32 @@ pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
return pfn; return pfn;
} }
pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
{
unsigned long addr;
addr = gfn_to_hva(kvm, gfn);
if (kvm_is_error_hva(addr)) {
get_page(bad_page);
return page_to_pfn(bad_page);
}
return hva_to_pfn(kvm, addr);
}
EXPORT_SYMBOL_GPL(gfn_to_pfn); EXPORT_SYMBOL_GPL(gfn_to_pfn);
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);
}
pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
struct kvm_memory_slot *slot, gfn_t gfn)
{
unsigned long addr = gfn_to_hva_memslot(slot, gfn);
return hva_to_pfn(kvm, addr);
}
struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
{ {
pfn_t pfn; pfn_t pfn;