diff mbox series

[048/127] kexec_file: don't place kexec images on IORESOURCE_MEM_DRIVER_MANAGED

Message ID 20200604234844.W8bo93R35%akpm@linux-foundation.org (mailing list archive)
State New, archived
Headers show
Series [001/127] kcov: cleanup debug messages | expand

Commit Message

Andrew Morton June 4, 2020, 11:48 p.m. UTC 
From: David Hildenbrand <david@redhat.com>
Subject: 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.

Link: http://lkml.kernel.org/r/20200508084217.9160-4-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/kexec_file.c |    5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

--- a/kernel/kexec_file.c~kexec_file-dont-place-kexec-images-on-ioresource_mem_driver_managed
+++ a/kernel/kexec_file.c
@@ -540,6 +540,11 @@  static int locate_mem_hole_callback(stru
 	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;