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677c90cc1d
In commit 88957116c9 I've adapted
libvirt to QEMU's deprecation of -mem-path and -mem-prealloc and
switched to memory-backend-* even for system memory. My claim was
that that's what QEMU does under the hood anyway. And indeed it
was: see QEMU commit 900c0ba373aada4c13d47d95330aa72ec4067ba5 and
look at function create_default_memdev().
However, then commit d96c4d5f193e0e45beec80a6277728b32875bddb was
merged into QEMU. While it was fixing a bug, it also changed the
create_default_memdev() function in which it started turning off
use of canonical path (by setting
"x-use-canonical-path-for-ramblock-id" attribute to false). This
wasn't documented until QEMU commit
8db0b20415c129cf5e577a593a4a0372d90b7cc9. The path affects
migration - the same path has to be used on the source and on the
destination. Therefore, if there is old guest started with '-m X'
it has "pc.ram" block which doesn't use canonical path and thus
when migrating to newer QEMU which uses memory-backend-* we have
to turn off the canonical path explicitly. Otherwise,
"/objects/pc.ram" path would be expected by QEMU which doesn't
match the source.
Ideally, we would need to set it only for some machine types
(4.0 and older) because newer machine types already do what we
are doing. However, we treat machine types as opaque strings and
therefore we don't want to parse nor inspect their versions. But
then again, newer machine types already do what we are doing in
this commit, so when old machine types are deprecated and removed
we can remove our hack and forget it ever happened.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1912201
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
40 lines
1.4 KiB
Plaintext
40 lines
1.4 KiB
Plaintext
LC_ALL=C \
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PATH=/bin \
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HOME=/tmp/lib/domain--1-fedora \
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USER=test \
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LOGNAME=test \
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XDG_DATA_HOME=/tmp/lib/domain--1-fedora/.local/share \
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XDG_CACHE_HOME=/tmp/lib/domain--1-fedora/.cache \
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XDG_CONFIG_HOME=/tmp/lib/domain--1-fedora/.config \
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QEMU_AUDIO_DRV=none \
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/usr/bin/qemu-system-x86_64 \
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-name guest=fedora,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-fedora/master-key.aes \
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-machine pc-i440fx-2.9,accel=kvm,usb=off,dump-guest-core=off,\
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memory-backend=pc.ram \
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-cpu EPYC-Rome,x2apic=on,tsc-deadline=on,hypervisor=on,tsc-adjust=on,stibp=on,\
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arch-capabilities=on,ssbd=on,xsaves=on,cmp-legacy=on,amd-ssbd=on,virt-ssbd=on,\
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rdctl-no=on,skip-l1dfl-vmentry=on,mds-no=on,pschange-mc-no=on \
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-m 4096 \
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-object memory-backend-file,id=pc.ram,\
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mem-path=/dev/hugepages2M/libvirt/qemu/-1-fedora,share=yes,\
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x-use-canonical-path-for-ramblock-id=no,prealloc=yes,size=4294967296 \
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-overcommit mem-lock=off \
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-smp 4,sockets=4,cores=1,threads=1 \
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-uuid 63840878-0deb-4095-97e6-fc444d9bc9fa \
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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 menu=on,strict=on \
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-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
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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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