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KVM: MMU: Partial swapping of guest memory

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This allows guest memory to be swapped.  Pages which are currently mapped
via shadow page tables are pinned into memory, but all other pages can
be freely swapped.

The patch makes gfn_to_page() elevate the page's reference count, and
introduces kvm_release_page() that pairs with it.

Signed-off-by: Izik Eidus <izike@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Izik Eidus
2007-10-18 11:09:33 +02:00
committed by Avi Kivity
parent cea7bb2128
commit 8a7ae055f3
4 changed files with 84 additions and 41 deletions
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drivers/kvm/kvm.h
+2
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@@ -409,6 +409,7 @@ struct kvm_memory_slot {
unsigned long *rmap;
unsigned long *dirty_bitmap;
int user_alloc; /* user allocated memory */
unsigned long userspace_addr;
};
struct kvm {
@@ -570,6 +571,7 @@ extern struct page *bad_page;
int is_error_page(struct page *page);
gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn);
struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
void kvm_release_page(struct page *page);
int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
int len);
int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);