Commit f9d46eb0 authored by Izik Eidus's avatar Izik Eidus Committed by Avi Kivity
Browse files

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: default avatarIzik Eidus <izike@qumranet.com>
Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent 1a6f4d7f

drivers/kvm/kvm.h

+1 −0
Original line number Diff line number Diff line
@@ -520,6 +520,7 @@ struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva); 
extern struct page *bad_page;



int is_error_page(struct page *page);

int kvm_is_error_hva(unsigned long addr);

int kvm_set_memory_region(struct kvm *kvm,

			  struct kvm_userspace_memory_region *mem,

			  int user_alloc);

drivers/kvm/kvm_main.c

+11 −0
Original line number Diff line number Diff line
@@ -498,6 +498,17 @@ int is_error_page(struct page *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)

{

	int i;