Commit 3e021bf5 authored by Izik Eidus's avatar Izik Eidus Committed by Avi Kivity
Browse files

KVM: Simplify kvm_clear_guest_page() 



Use kvm_write_guest_page() with empty_zero_page, instead of doing
kmap and memset.

Signed-off-by: default avatarIzik Eidus <izike@qumranet.com>
Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent ec8d4eae

drivers/kvm/kvm_main.c

+2 −16
Original line number Diff line number Diff line
@@ -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);