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KVM: add kvm_is_error_hva() 

Check for the "error hva", an address outside the user address space that
signals a bad gfn.

Signed-off-by: Izik Eidus <izike@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Izik Eidus 2007-11-11 22:02:22 +02:00 committed by Avi Kivity
parent 1a6f4d7fbd
commit f9d46eb0e4
2 changed files with 12 additions and 0 deletions
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1
drivers/kvm/kvm.h
View File

@ -520,6 +520,7 @@ struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
extern struct page *bad_page; extern struct page *bad_page;
int is_error_page(struct page *page); int is_error_page(struct page *page);
int kvm_is_error_hva(unsigned long addr);
int kvm_set_memory_region(struct kvm *kvm, int kvm_set_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem, struct kvm_userspace_memory_region *mem,
int user_alloc); int user_alloc);

11
drivers/kvm/kvm_main.c
View File

@ -498,6 +498,17 @@ int is_error_page(struct page *page)
} }
EXPORT_SYMBOL_GPL(is_error_page); EXPORT_SYMBOL_GPL(is_error_page);
static inline unsigned long bad_hva(void)
{
return PAGE_OFFSET;
}
int kvm_is_error_hva(unsigned long addr)
{
return addr == bad_hva();
}
EXPORT_SYMBOL_GPL(kvm_is_error_hva);
gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn) gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
{ {
int i; int i;