Hi Simon, On Mon, Jul 31, 2023 at 10:37 PM Simon Glass <s...@chromium.org> wrote: > > Hi Bin, > > On Mon, 31 Jul 2023 at 08:32, Bin Meng <bmeng...@gmail.com> wrote: > > > > Hi Simon, > > > > On Sat, Jul 29, 2023 at 1:32 AM Simon Glass <s...@chromium.org> wrote: > > > > > > Hi Bin, > > > > > > On Fri, 28 Jul 2023 at 09:46, Bin Meng <bmeng...@gmail.com> wrote: > > > > > > > > Hi Simon, > > > > > > > > On Mon, Jul 24, 2023 at 10:52 PM Simon Glass <s...@chromium.org> wrote: > > > > > > > > > > Unfortunately the bochs driver does not currently work with distros. > > > > > It > > > > > causes a hang sometime between grub menu selection and the OS > > > > > displaying > > > > > something. > > > > > > > > Does this reproduce reliably? > > > > > > Yes, it does. > > > > > > BTW I've also hit another problem with '-M accel-kvm' which hangs on > > > the move to 64-bit mode. Oddly if I boot U-Boot from coreboot, the > > > problem goes away. So perhaps coreboot is doing some x86 init which > > > U-Boot is missing. > > > > This indicates a kvm-x86 bug. I think you can simplify a test case and > > report it to the KVM mailing list. > > Firstly it doesn't really matter, since it doesn't work, so we do need > to revert.
Agreed, but before we revert this, I would like to see we investigate this issue a little bit further. I enabled the grub debug output today and not sure if grub jumps to the kernel entry yet: kern/verifiers.c:214: string: boot, type: 2 loader/efi/linux_sb.c:55: kernel_addr: 0x1000000 handover_offset: 0x190 params: 0x7ce63000 > > Secondly I am not sure it kvm's fault, since the problem does not > happen with coreboot. I will see if I can isolate what coreboot is > doing differently, but not sure that that fix will make the release. Does the 64-bit mode switch ever work on a real x86 board? If yes, then it's very likely a KVM bug. If not, then we can check the coreboot to find out the difference. Regards, Bin