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qemuBlockStorageSourceNeedsFormatLayer: Stop formatting 'raw' driver when not needed

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The 'raw' driver without any special configuration is not needed and
creates overhead in qemu.

Stop using the 'raw' format driver in cases when it's not needed. A
special case when it is needed is for FD passed images with only a
single writable FD passed, where we need an overlay driver to properly
reflect the 'read-only' flag.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa
2023-10-19 22:07:49 +02:00
parent abdcb46012
commit 6eaf3614b6
389 changed files with 1304 additions and 1939 deletions
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10
tests/qemuxmlconfdata/disk-usb-device.x86_64-latest.args
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@@ -27,12 +27,10 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \
-no-shutdown \
-boot strict=on \
-device '{"driver":"piix3-usb-uhci","id":"usb","bus":"pci.0","addr":"0x1.0x2"}' \
-blockdev '{"driver":"host_device","filename":"/dev/HostVG/QEMUGuest1","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-2-format","read-only":false,"driver":"raw","file":"libvirt-2-storage"}' \
-device '{"driver":"ide-hd","bus":"ide.0","unit":0,"drive":"libvirt-2-format","id":"ide0-0-0","bootindex":1}' \
-blockdev '{"driver":"file","filename":"/tmp/usbdisk.img","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-1-format","read-only":false,"driver":"raw","file":"libvirt-1-storage"}' \
-device '{"driver":"usb-storage","bus":"usb.0","port":"1","drive":"libvirt-1-format","id":"usb-disk0","removable":false}' \
-blockdev '{"driver":"host_device","filename":"/dev/HostVG/QEMUGuest1","node-name":"libvirt-2-storage","read-only":false}' \
-device '{"driver":"ide-hd","bus":"ide.0","unit":0,"drive":"libvirt-2-storage","id":"ide0-0-0","bootindex":1}' \
-blockdev '{"driver":"file","filename":"/tmp/usbdisk.img","node-name":"libvirt-1-storage","read-only":false}' \
-device '{"driver":"usb-storage","bus":"usb.0","port":"1","drive":"libvirt-1-storage","id":"usb-disk0","removable":false}' \
-audiodev '{"id":"audio1","driver":"none"}' \
-device '{"driver":"virtio-balloon-pci","id":"balloon0","bus":"pci.0","addr":"0x2"}' \
-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \