From: David Hildenbrand <david@xxxxxxxxxx> 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@xxxxxxxxxx Signed-off-by: David Hildenbrand <david@xxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Cc: Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx> Cc: Wei Yang <richard.weiyang@xxxxxxxxx> Cc: Baoquan He <bhe@xxxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx> Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> Cc: Dan Williams <dan.j.williams@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- kernel/kexec_file.c | 5 +++++ 1 file changed, 5 insertions(+) --- 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; _
