On 03/05/19 at 04:24pm, Kairui Song wrote: > On Mon, Mar 4, 2019 at 2:30 PM Dave Young <dyoung@xxxxxxxxxx> wrote: > > > > On 02/28/19 at 06:07pm, Kairui Song wrote: > > > 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 --force-vga options to let user decide if the > > > old screen_info should be used unconditional or not. > > > > It looks good to me except the option name, because vga usually means > > the specific vga video type. But here you are enforcing to reuse the first > > kernel original video type. > > > > It would be better to use --reuse-video-type or --force-orig-video, etc.. > > > > Thanks for the review, the naming is not very good indeed, will update > the patch. How about just --reuse-video? This should be general enough > and clear. Hmm, I feel --reuse-video-type is clearer, --reuse-video seems not clear :) > > -- > Best Regards, > Kairui Song _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
