提交 3e021bf5 编写于 作者: I Izik Eidus 提交者: Avi Kivity

KVM: Simplify kvm_clear_guest_page()

Use kvm_write_guest_page() with empty_zero_page, instead of doing
kmap and memset.
Signed-off-by: NIzik Eidus <izike@qumranet.com>
Signed-off-by: NAvi Kivity <avi@qumranet.com>
上级 ec8d4eae
......@@ -46,6 +46,7 @@
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/desc.h>
#include <asm/pgtable.h>
MODULE_AUTHOR("Qumranet");
MODULE_LICENSE("GPL");
......@@ -633,22 +634,7 @@ int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
{
void *page_virt;
struct page *page;
page = gfn_to_page(kvm, gfn);
if (is_error_page(page)) {
kvm_release_page(page);
return -EFAULT;
}
page_virt = kmap_atomic(page, KM_USER0);
memset(page_virt + offset, 0, len);
kunmap_atomic(page_virt, KM_USER0);
kvm_release_page(page);
mark_page_dirty(kvm, gfn);
return 0;
return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
}
EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
......
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