QEMU

  1. Bug #1715700
  2. Comment #25

Comment 25 for bug 1715700

Revision history for this message
Laszlo Ersek (Red Hat) (lersek) wrote : Re: [Bug 1715700] Re: Windows 7 guest won't boot on qemu 2.10 (works on 2.9)

On 09/19/17 14:38, Gerd Hoffmann wrote:
>> (2) Build the SeaBIOS CSM (CONFIG_CSM=y), and embed it into OVMF,
>> like described above. Then, boot Windows 7 in *UEFI Mode*.
>
>> Option #1 and option #2 no longer work because the CSM infrastructure
>> in edk2 needs to be able to write 0xc0000.
>
> Well, option #2 works for me.
>

Correct, and that's because edk2 commit db27e9f3d8f0 fixed the PAM
register offsets for Q35, in the CSM platform support. At that time we
missed that the same should be done in the VBE Shim as well.

I'm going to do it for the VBE Shim now.

(I'm pretty sure UEFI Windows 7 boots fine with the VBE Shim right now,
on QEMU 2.10, if the machine type is i440fx, not q35.)

Thanks for the help!
Laszlo