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-rw-r--r--virt/kvm/kvm_main.c68
1 files changed, 61 insertions, 7 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 93ed78b015c0..6a52c084e068 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -40,6 +40,7 @@
#include <linux/kvm_para.h>
#include <linux/pagemap.h>
#include <linux/mman.h>
+#include <linux/swap.h>
#include <asm/processor.h>
#include <asm/io.h>
@@ -458,6 +459,12 @@ int is_error_page(struct page *page)
}
EXPORT_SYMBOL_GPL(is_error_page);
+int is_error_pfn(pfn_t pfn)
+{
+ return pfn == bad_pfn;
+}
+EXPORT_SYMBOL_GPL(is_error_pfn);
+
static inline unsigned long bad_hva(void)
{
return PAGE_OFFSET;
@@ -519,7 +526,7 @@ unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
/*
* Requires current->mm->mmap_sem to be held
*/
-struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
+pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
{
struct page *page[1];
unsigned long addr;
@@ -530,7 +537,7 @@ struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
addr = gfn_to_hva(kvm, gfn);
if (kvm_is_error_hva(addr)) {
get_page(bad_page);
- return bad_page;
+ return page_to_pfn(bad_page);
}
npages = get_user_pages(current, current->mm, addr, 1, 1, 1, page,
@@ -538,27 +545,71 @@ struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
if (npages != 1) {
get_page(bad_page);
- return bad_page;
+ return page_to_pfn(bad_page);
}
- return page[0];
+ return page_to_pfn(page[0]);
+}
+
+EXPORT_SYMBOL_GPL(gfn_to_pfn);
+
+struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
+{
+ return pfn_to_page(gfn_to_pfn(kvm, gfn));
}
EXPORT_SYMBOL_GPL(gfn_to_page);
void kvm_release_page_clean(struct page *page)
{
- put_page(page);
+ kvm_release_pfn_clean(page_to_pfn(page));
}
EXPORT_SYMBOL_GPL(kvm_release_page_clean);
+void kvm_release_pfn_clean(pfn_t pfn)
+{
+ put_page(pfn_to_page(pfn));
+}
+EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
+
void kvm_release_page_dirty(struct page *page)
{
+ kvm_release_pfn_dirty(page_to_pfn(page));
+}
+EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
+
+void kvm_release_pfn_dirty(pfn_t pfn)
+{
+ kvm_set_pfn_dirty(pfn);
+ kvm_release_pfn_clean(pfn);
+}
+EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
+
+void kvm_set_page_dirty(struct page *page)
+{
+ kvm_set_pfn_dirty(page_to_pfn(page));
+}
+EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
+
+void kvm_set_pfn_dirty(pfn_t pfn)
+{
+ struct page *page = pfn_to_page(pfn);
if (!PageReserved(page))
SetPageDirty(page);
- put_page(page);
}
-EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
+EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
+
+void kvm_set_pfn_accessed(pfn_t pfn)
+{
+ mark_page_accessed(pfn_to_page(pfn));
+}
+EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
+
+void kvm_get_pfn(pfn_t pfn)
+{
+ get_page(pfn_to_page(pfn));
+}
+EXPORT_SYMBOL_GPL(kvm_get_pfn);
static int next_segment(unsigned long len, int offset)
{
@@ -1351,6 +1402,7 @@ static struct sys_device kvm_sysdev = {
};
struct page *bad_page;
+pfn_t bad_pfn;
static inline
struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
@@ -1392,6 +1444,8 @@ int kvm_init(void *opaque, unsigned int vcpu_size,
goto out;
}
+ bad_pfn = page_to_pfn(bad_page);
+
r = kvm_arch_hardware_setup();
if (r < 0)
goto out_free_0;