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Re: [Qemu-devel] [edk2] syslinux vs. OVMF
From: |
Laszlo Ersek |
Subject: |
Re: [Qemu-devel] [edk2] syslinux vs. OVMF |
Date: |
Fri, 10 Apr 2015 12:06:11 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
On 04/10/15 10:14, Gerd Hoffmann wrote:
> Hi,
>
>> In summary, please ask Gerd to rebuild the ipxe binaries that are
>> bundled with upstream qemu such that they include those two iPXE patches
>> of ours (see the last reference).
>
> https://www.kraxel.org/cgit/qemu/log/?h=rebase/roms-next
>
> Can you give this a try?
Thank you for this update, I tested it.
(1) I reproduced the issue, so that I could be sure that the fix wasn't
meaningless. Indeed the bug reproduces with the iPXE binaries bundled
with upstream qemu.
I then checked out, built and installed your branch, and tried again,
with virtio-net and then e1000.
(2) Virito-net results:
- OVMF loads shim.efi via network
- shim.efi loads grubx64.efi via network
- grubx64.efi loads grub.cfg via network
- grubx64.efi loads vmlinuz via network
However, while grubx64.efi loads initrd.img via the network, qemu
crashes the guest, with the following message:
qemu-system-x86_64: Guest moved used index from 46499 to 65534
This is a virtio protocol bug in the guest (efi-virtio.rom), *or* in
QEMU. I don't know.
* e1000 results:
- OVMF loads shim.efi via network
- shim.efi loads grubx64.efi via network
- grubx64.efi loads grub.cfg via network
- grubx64.efi loads vmlinuz via network
- grubx64.efi loads initrd.img via network
- guest kernel boots
So, I think the update is fine in general; but maybe there's a new
virtio-related bug in either "efi-virtio.rom" or in QEMU.
(When I originally wrote the (earlier versions of the) patches, I tested
them with virtio-net using RHEL-7 qemu, so I guess this could be an
upstream QEMU regression. The machine type I used for testing was
pc-i440fx-2.3.)
(3) ... Confirmed, this is a qemu regression. Namely, I checked your new
efi-virtio.rom with RHEL-7 qemu, and it works fine. CC'ing qemu-devel.
(4) Independently -- can you please update the commit message on
"roms/ipxe-patches/0002-efi-make-load-file-protocol-optional.patch"?
The code is indeed all yours in that patch, but I did the initial
analysis and the first fix. Can you please add a Suggested-by, and
reference (or even: include) the analysis in
<http://lists.ipxe.org/pipermail/ipxe-devel/2015-February/003979.html>?
Thanks!
Laszlo
- Re: [Qemu-devel] [edk2] syslinux vs. OVMF,
Laszlo Ersek <=