Messages in this thread Patch in this message | | | From | Avi Kivity <> | Subject | [PATCH 44/55] KVM: add kvm_is_error_hva() | Date | Wed, 26 Dec 2007 13:05:49 +0200 |
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From: Izik Eidus <izike@qumranet.com>
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> --- drivers/kvm/kvm.h | 1 + drivers/kvm/kvm_main.c | 11 +++++++++++ 2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h index 3f5ffc3..6498324 100644 --- a/drivers/kvm/kvm.h +++ b/drivers/kvm/kvm.h @@ -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); diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index dacdc66..e3c7f3b 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -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; -- 1.5.3.7
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