regression in booting with -kernel in 7.2.0

regression in booting with -kernel in 7.2.0

[Christoph Hellwig]

Hi all,

qemu 7.2.0 fails to boot my usual test setup using -kernel (see
the actual script below).  I've bisected this down to:

commit ffe2d2382e5f1aae1abc4081af407905ef380311
Author: Jason A. Donenfeld <Jason@zx2c4.com>
Date:   Wed Sep 21 11:31:34 2022 +0200

    x86: re-enable rng seeding via SetupData

with this commit I don't even get to kernel console output, with it
reverted it boots fine (although with 7.2 configuring the network
takes forever, the actua bisection point before the commit does not
show that issue)

---
#!/bin/sh

hostdev='driver=host_device,cache.direct=on,cache.no-flush=on'
	
/opt/qemu/bin/qemu-system-x86_64 \
	-nographic \
	-enable-kvm \
	-m 4096 \
	-smp 4 \
	-cpu host \
	-kernel arch/x86/boot/bzImage \
	-append "root=/dev/vda console=ttyS0,115200n8 cgroup_no_v1=all" \
	-blockdev driver=file,cache.direct=on,node-name=root,filename=/home/hch/images/bullseye.img \
	-device virtio-blk,drive=root \
	-blockdev ${hostdev},node-name=test,filename=/dev/nvme0n1p4 \
	-device virtio-blk,drive=test \
	-blockdev ${hostdev},node-name=scratch,filename=/dev/nvme0n1p5 \
	-device virtio-blk,drive=scratch \
	-blockdev ${hostdev},node-name=scratch2,filename=/dev/nvme0n1p6 \
	-device virtio-blk,drive=scratch2 \
	-blockdev ${hostdev},node-name=scratch3,filename=/dev/nvme0n1p7 \
	-device virtio-blk,drive=scratch3 \
	-blockdev ${hostdev},node-name=scratch4,filename=/dev/nvme0n1p8 \
	-device virtio-blk,drive=scratch4 \
	-blockdev ${hostdev},node-name=scratch5,filename=/dev/nvme0n1p9 \
	-device virtio-blk,drive=scratch5

Re: regression in booting with -kernel in 7.2.0

[Daniel P. Berrangé]

On Thu, Jan 12, 2023 at 11:36:22PM -0800, Christoph Hellwig wrote:
> Hi all,
> 
> qemu 7.2.0 fails to boot my usual test setup using -kernel (see
> the actual script below).  I've bisected this down to:
> 
> commit ffe2d2382e5f1aae1abc4081af407905ef380311
> Author: Jason A. Donenfeld <Jason@zx2c4.com>
> Date:   Wed Sep 21 11:31:34 2022 +0200
> 
>     x86: re-enable rng seeding via SetupData
> 
> with this commit I don't even get to kernel console output, with it
> reverted it boots fine (although with 7.2 configuring the network
> takes forever, the actua bisection point before the commit does not
> show that issue)

Workaround is -machine pc-i440fx-7.1

Latest proposed fix IIRC is

  https://lists.gnu.org/archive/html/qemu-devel/2022-12/msg04862.html


With regards,
Daniel
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