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Re: Disk cache defaults
From: |
Stefan Hajnoczi |
Subject: |
Re: Disk cache defaults |
Date: |
Wed, 29 Jul 2020 14:02:45 +0100 |
On Wed, Jul 22, 2020 at 07:14:59AM +0100, anthony smith wrote:
> Appreciate any assistance even if the answer is just "Not possible" so I
> can at least drop this search for answers.
You can create an /etc/qemu/qemu.conf file but I don't remember if there
is syntax to set -drive cache=none.
CCing Kevin Wolf and Markus Armbruster for ideas.
The hacky "solution" is to write a wrapper script (e.g. a shell script)
that modifies QEMU command-line arguments to use cache=none if no
explicit cache= option was given:
$ cat qemu-wrapper.sh
#!/bin/bash
# Add QEMU -drive cache=none
declare -a opts
i=0
is_drive=0
for opt in "$@"; do
if [ "$is_drive" -eq 1 ]; then
opt="$opt,cache=none" # TODO skip if cache= is already in opts?
fi
opts[$i]="$opt"
if [ "$opt" = "-drive" ]; then
is_drive=1
else
is_drive=0
fi
i=$((i + 1))
done
exec /usr/bin/qemu-system-x86_64 "${opts[@]}"
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- Re: Disk cache defaults,
Stefan Hajnoczi <=