diff options
| author | Kairui Song <kasong@redhat.com> | 2019-03-05 19:34:33 +0800 |
|---|---|---|
| committer | Simon Horman <horms@verge.net.au> | 2019-03-06 13:50:08 +0100 |
| commit | fb5a8792e6e4ee7de7ae3e06d193ea5beaaececc (patch) | |
| tree | 98b912b123e2f338222b64ab7f88f987662aecf7 /kexec/arch/x86_64/kexec-x86_64.c | |
| parent | 3757ef630b72385157c02439dd633399a4f43f45 (diff) | |
x86: Introduce a new option --reuse-video-type
After commit 060eee58 "x86: use old screen_info if needed", kexec-tools
will force use old screen_info and vga type if failed to determine
current vga type. But it is not always a good idea.
Currently kernel hanging is inspected on some hyper-v VMs after this
commit, because hyperv_fb will mimic EFI (or VESA) VGA on first boot
up, but after the real driver is loaded, it will switch to new mode
and no longer compatible with EFI/VESA VGA. Keep setting
orig_video_isVGA to EFI/VESA VGA flag will get wrong driver loaded and
try to manipulate the framebuffer in a wrong way.
We can't ensure this won't happen on other framebuffer drivers, But
it's a helpful feature if the framebuffer drivers just work. So this
patch introduce a --reuse-video-type options to let user decide if the
old screen_info hould be used unconditional or not.
Signed-off-by: Kairui Song <kasong@redhat.com>
Reviewed-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Diffstat (limited to 'kexec/arch/x86_64/kexec-x86_64.c')
| -rw-r--r-- | kexec/arch/x86_64/kexec-x86_64.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kexec/arch/x86_64/kexec-x86_64.c b/kexec/arch/x86_64/kexec-x86_64.c index 041b007..ccdc980 100644 --- a/kexec/arch/x86_64/kexec-x86_64.c +++ b/kexec/arch/x86_64/kexec-x86_64.c @@ -55,6 +55,7 @@ void arch_usage(void) " --console-serial Enable the serial console\n" " --pass-memmap-cmdline Pass memory map via command line in kexec on panic case\n" " --noefi Disable efi support\n" + " --reuse-video-type Reuse old boot time video type blindly\n" ); } @@ -67,6 +68,7 @@ struct arch_options_t arch_options = { .core_header_type = CORE_TYPE_ELF64, .pass_memmap_cmdline = 0, .noefi = 0, + .reuse_video_type = 0, }; int arch_process_options(int argc, char **argv) @@ -136,6 +138,9 @@ int arch_process_options(int argc, char **argv) case OPT_NOEFI: arch_options.noefi = 1; break; + case OPT_REUSE_VIDEO_TYPE: + arch_options.reuse_video_type = 1; + break; } } /* Reset getopt for the next pass; called in other source modules */ |