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2c4c347c4b
To allow using -blockdev with blockjobs QEMU needs to reopen files in read-write mode when modifying the backing chain. To achieve this we need to use 'auto-read-only' for the backing files rather than the normal 'read-only' property. That way qemu knows that the files need to be reopened. Note that the format drivers (e.g. qcow2) are still opened with the read-only property enabled when being a member of the backing chain since they are supposed to be immutable unless a block job is started. QEMU v4.0 (since commit 23dece19da4) allows also dynamic behaviour for auto-read-only which allows us to use sVirt as we only grant write permissions to files when doing a blockjob. Signed-off-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>
42 lines
1.4 KiB
Plaintext
42 lines
1.4 KiB
Plaintext
LC_ALL=C \
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PATH=/bin \
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HOME=/tmp/lib/domain--1-QEMUGuest1 \
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USER=test \
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LOGNAME=test \
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XDG_DATA_HOME=/tmp/lib/domain--1-QEMUGuest1/.local/share \
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XDG_CACHE_HOME=/tmp/lib/domain--1-QEMUGuest1/.cache \
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XDG_CONFIG_HOME=/tmp/lib/domain--1-QEMUGuest1/.config \
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QEMU_AUDIO_DRV=none \
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NS=ns \
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BAR='' \
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/usr/bin/qemu-system-i686 \
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-name guest=QEMUGuest1,debug-threads=on \
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-S \
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-object secret,id=masterKey0,format=raw,\
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file=/tmp/lib/domain--1-QEMUGuest1/master-key.aes \
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-machine pc,accel=tcg,usb=off,dump-guest-core=off \
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-m 214 \
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-overcommit mem-lock=off \
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-smp 1,sockets=1,cores=1,threads=1 \
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-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
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-display none \
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-no-user-config \
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-nodefaults \
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-chardev socket,id=charmonitor,fd=1729,server,nowait \
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-mon chardev=charmonitor,id=monitor,mode=control \
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-rtc base=utc \
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-no-shutdown \
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-no-acpi \
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-boot strict=on \
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-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
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-blockdev '{"driver":"host_device","filename":"/dev/HostVG/QEMUGuest1",\
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"node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}' \
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-blockdev '{"node-name":"libvirt-1-format","read-only":false,"driver":"raw",\
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"file":"libvirt-1-storage"}' \
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-device ide-hd,bus=ide.0,unit=0,drive=libvirt-1-format,id=ide0-0-0,bootindex=1 \
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-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x2 \
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-unknown parameter \
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-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,\
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resourcecontrol=deny \
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-msg timestamp=on
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