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Re: absolute firmware path made relocatable in qemu 5.2.0

From: Paolo Bonzini
Subject: Re: absolute firmware path made relocatable in qemu 5.2.0
Date: Tue, 12 Jan 2021 15:48:13 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0

On 12/01/21 15:05, Dave wrote:
Is seem that absolute firmwarepath compilation option is convertedĀ  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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