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Re: absolute firmware path made relocatable in qemu 5.2.0

From: Dave
Subject: Re: absolute firmware path made relocatable in qemu 5.2.0
Date: Tue, 12 Jan 2021 20:46:29 +0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0

Hi Paolo,

While this (option 2) partially works, it will still search for /nonexistent/libexec/qemu-bridge-helper for example so seems that some paths are still absolute and some relative.

To explain, what we are expecting that we compile one binary with the relevant options, test that and then it goes into production. If we compile with --prefix=/usr (it's final resting place will be /usr/bin) then everything works as expected once it is in production (since /usr/share/qemu, /usr/libexec, /etc/qemu exists as expected). However when we are testing the binary in a directory /root/qemu/5.2.0 with --prefix=/usr it breaks since it converts the firmware and bios paths to /root/qemu/5.2.0/../share/qemu. This means we need to recompile twice with relevant prefixes since if i use --prefix=/nonexistent then we can't find the qemu-bridge-helper when the binary goes into production.

It would be nicer with the relocatable binary took some fixed paths from /etc/qemu.conf for the bridge-helper, firmware, bios, qemu-ifup/down.


On 12/01/2021 18:48, Paolo Bonzini wrote:
On 12/01/21 15:05, Dave wrote:
Is seem that absolute firmwarepath compilation option is converted  to relocatable in 5.2.0 qemu.

# QEMU configure log Tue 12 Jan 14:46:41 GST 2021
# Configured with: '../configure' '--prefix=/usr' '--sysconfdir=/etc/qemu' '--disable-bochs' '*--firmwarepath=/usr/share/qemu:/usr/share/qemu-firmware*'

Yes, all paths within the prefix are relocated.  The workaround is simply to configure the intended prefix with configure:

./configure --prefix=/root/qemu ...

or if you don't know the prefix:

./configure --prefix=/nonexistent ...

Because /usr/share/qemu and /usr/share/qemu-firmware are outside /usr, they will be treated as absolute just like /etc/qemu.



And trying to run the executable

    bash-5.1# ./qemu-system-x86_64
    qemu: could not load PC BIOS 'bios-256k.bin'

If i print out the resultant binary paths

    bash-5.1# ./qemu-system-x86_64 -L help

So there is no way to have a absolute path for firmware /bios and all qemu's that we test need to be at the right directory nesting to find firmware, bios etc or else they all need their own duplicate firmware files. Firmware path needs to honor the absolute paths i believe.

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