Re: HTTP boot failed on timeout

Laszlo Ersek

On 02/17/20 10:45, wrote:
Some inputs:
Qemu version: QEMU emulator version 2.5.0 (Debian
1:2.5+dfsg-5ubuntu10.34), Copyright (c) 2003-2008 Fabrice Bellard
Qemu CMD: /usr/bin/qemu-system-x86_64 \
-name HTTP-BOOT-VM-1 \
-m 8192M \
-smp cpus=1 \
-enable-kvm \
-machine smm=off \
-boot order=c \
-bios /opt/gns3/images/QEMU/OVMF-RELEASE.fd \
Ugh this makes my eyes bleed. :/ Please never use the "-bios" option
with OVMF.

Anyway that's not our current topic here.

-drive file=/opt/gns3/projects/1a83274a-c57f-4337-8a0d-1e68a9312e9a/project-files/qemu/d8f37f0b-2b63-455f-b536-b309b9020e36/hda_disk.qcow2,if=ide,index=0,media=disk \
-uuid d8f37f0b-2b63-455f-b536-b309b9020e36 \
-vnc \
-monitor tcp:,server,nowait \
-net none \
Seems inconsistent with your intent to HTTP Boot... At least superfluous
with the below, I'd think

-device virtio-net-pci,mac=0c:2e:9a:0e:36:00,netdev=gns3-0 \
Seems OK; so you are using virtio-net-pci.

-netdev socket,id=gns3-0,udp=,localaddr= \
Unfortunately, I'm entirely unused to "-netdev socket", especially with
"udp=...". I only use "-netdev tap" (via libvirt).

-nographic \
-debugcon file:debug.log \
-global isa-debugcon.iobase=0x402

The OVMF log is empty, all the logs appear in attached qemu.log file.
Hmmm... Ah you mention "OVMF-RELEASE.fd" above. So that must be a
RELEASE build of OVMF, which indeed does not produce debug messages. Can
you try with DEBUG please?

I've did some debugging myself and found out the offending line is
File: NetworkPkg/HttpBootDxe/HttpBootSupport.c#L1012
The error is handled here:
Yes, I checked those lines after reading your earlier message.

I asked for your command line and the OVMF debug log because I wanted to
see if you were using the iPXE SNP driver for virtio-net (you most
likely are, from the info thus far). It could be interesting to try the
built-in virtio-net driver, for one data point. (This would be a
front-end check.)

Second, I have no idea what's happening on the udp socket netdev
back-end. It could explain the virtual network glitches you are seeing.
I'm not sure.


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