KVM: Simplify kvm_clear_guest_page() (3e021bf5) · Commits · 戴 / test

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);