kexec-tools: add noefi arch cmdline option

For kernel boot with efi=old_map or some quirked machines like SGI UV
they use old ioremap instead of 1:1 mapping. But kexec efi support
depends on the 1:1 mapping thus we need to switch to use the old way

There's a kernel patch for exporting the efi flags so we can check the memory
mapping method. But user may want to explictly disable efi boot for unknown
reasons.

So here add a new arch option '--noefi' for this case.

Signed-off-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

1 files changed, 6 insertions, 0 deletions

diff --git a/kexec/arch/i386/kexec-x86.c b/kexec/arch/i386/kexec-x86.c
index 0b58dff..0f23eb9 100644
--- a/kexec/arch/i386/kexec-x86.c
+++ b/kexec/arch/i386/kexec-x86.c
@@ -55,6 +55,7 @@ void arch_usage(void)
 		"     --elf32-core-headers      Prepare core headers in ELF32 format\n"
 		"     --elf64-core-headers      Prepare core headers in ELF64 format\n"
 		"     --pass--memmap-cmdline    Pass memory map via command line in kexec on panic case\n"
+		"     --noefi                   Disable efi support\n"
 		);
 }
 
@@ -66,6 +67,7 @@ struct arch_options_t arch_options = {
 	.console_serial = 0,
 	.core_header_type = CORE_TYPE_UNDEF,
 	.pass_memmap_cmdline = 0,
+	.noefi = 0,
 };
 
 int arch_process_options(int argc, char **argv)
@@ -137,6 +139,10 @@ int arch_process_options(int argc, char **argv)
 			break;
 		case OPT_PASS_MEMMAP_CMDLINE:
 			arch_options.pass_memmap_cmdline = 1;
+			break;
+		case OPT_NOEFI:
+			arch_options.noefi = 1;
+			break;
 		}
 	}
 	/* Reset getopt for the next pass; called in other source modules */