HWPOISON: Add madvise() based injector for hardware poisoned pages v4 (9893e49d) · Commits · 戴 / test

include/asm-generic/mman-common.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -34,6 +34,7 @@
		#define MADV_REMOVE 9 /* remove these pages & resources */
		#define MADV_DONTFORK 10 /* don't inherit across fork */
		#define MADV_DOFORK 11 /* do inherit across fork */
		#define MADV_HWPOISON 100 /* poison a page for testing */

		/* compatibility flags */
		#define MAP_FILE 0

+30 −0

Original line number	Diff line number	Diff line
		@@ -207,6 +207,32 @@ static long madvise_remove(struct vm_area_struct *vma,
		return error;
		}

		#ifdef CONFIG_MEMORY_FAILURE
		/*
		* Error injection support for memory error handling.
		*/
		static int madvise_hwpoison(unsigned long start, unsigned long end)
		{
		int ret = 0;

		if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
		for (; start < end; start += PAGE_SIZE) {
		struct page *p;
		int ret = get_user_pages(current, current->mm, start, 1,
		0, 0, &p, NULL);
		if (ret != 1)
		return ret;
		printk(KERN_INFO "Injecting memory failure for page %lx at %lx\n",
		page_to_pfn(p), start);
		/* Ignore return value for now */
		__memory_failure(page_to_pfn(p), 0, 1);
		put_page(p);
		}
		return ret;
		}
		#endif

		static long
		madvise_vma(struct vm_area_struct vma, struct vm_area_struct *prev,
		unsigned long start, unsigned long end, int behavior)
		@@ -307,6 +333,10 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
		int write;
		size_t len;

		#ifdef CONFIG_MEMORY_FAILURE
		if (behavior == MADV_HWPOISON)
		return madvise_hwpoison(start, start+len_in);
		#endif
		if (!madvise_behavior_valid(behavior))
		return error;