kexec_file: don't place kexec images on IORESOURCE_MEM_DRIVER_MANAGED

Memory flagged with IORESOURCE_MEM_DRIVER_MANAGED is special - it won't be part of the initial memmap of the kexec kernel and not all memory might be accessible. Don't place any kexec images onto it. Signed-off-by: David Hildenbrand <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Pankaj Gupta <[email protected]> Cc: Wei Yang <[email protected]> Cc: Baoquan He <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Eric Biederman <[email protected]> Cc: Pavel Tatashin <[email protected]> Cc: Dan Williams <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Linus Torvalds <[email protected]>
blogic · Jun 5, 2020 · 3fe4f49 · 3fe4f49
1 parent 7b7b272
commit 3fe4f49
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
@@ -540,6 +540,11 @@ static int locate_mem_hole_callback(struct resource *res, void *arg)
 	unsigned long sz = end - start + 1;
 
 	/* Returning 0 will take to next memory range */
+
+	/* Don't use memory that will be detected and handled by a driver. */
+	if (res->flags & IORESOURCE_MEM_DRIVER_MANAGED)
+		return 0;
+
 	if (sz < kbuf->memsz)
 		return 0;