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x86/efi: Do not export efi runtime map in case old map

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For ioremapped efi memory aka old_map the virt addresses are not persistant
across kexec reboot. kexec-tools will read the runtime maps from sysfs then
pass them to 2nd kernel and assuming kexec efi boot is ok. This will cause
kexec boot failure.

To address this issue do not export runtime maps in case efi old_map so
userspace can use no efi boot instead.

Signed-off-by: Dave Young <dyoung@redhat.com>
Acked-by: Borislav Petkov <bp@suse.de>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Dave Young 2014-05-30 11:20:10 +08:00 • committed by Matt Fleming
parent 34f51147d2
commit a3530e8fe9
1 changed files with 3 additions and 0 deletions
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3
arch/x86/platform/efi/efi.c
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@ -919,6 +919,9 @@ static void __init save_runtime_map(void)
void *tmp, *p, *q = NULL;
int count = 0;
if (efi_enabled(EFI_OLD_MEMMAP))
return;
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
md = p;