October 2024 - Devel - libvirt List Archives

[PATCH 0/2] add NIC hotplug support to test hypervisor
by John Levon 03 Oct '24

03 Oct '24

These two patches add basic support for NIC hot[un]plug to the test hypervisor, based on the qemu driver; only ethernet and bridge type VNICS are currently supported. John Levon (2): test_driver: provide basic NIC hotplug support test_driver: provide basic NIC hotunplug support src/test/test_driver.c | 305 ++++++++++++++++++++++++++++++++++++++--- 1 file changed, 283 insertions(+), 22 deletions(-) -- 2.34.1

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[PATCH v6 00/13] qemu: Introduce shared_filesystems configuration option
by Andrea Bolognani 02 Oct '24

02 Oct '24

The need to have something like this in the first place is driven by KubeVirt (see [1] and [2]). A draft version of this series has been integrated into KubeVirt and it has been confirmed that it was effective in removing the need to use LD_PRELOAD hacks in the storage provider. Changes from [v5]: * make migration of domains with TPM work (patches 12 and 13); * fixed all typos for "remember"; * added R-bs for Peter's patches. Changes from [v4] (v5 was posted by Peter): * added patch 7 cleaning up a helper function (noticed just while reading the code) * added patch 8 properly unrefing security labels in dac/selinux drivers on outgoing migration * patch 11: added handling of the 'nvram' image file (and refactored the function to allow reuse) Changes from [v3] (v4 was posted by Peter): * patch 2/8 was modified to change the docs for the new option. * patches 1-5 will get an R-b by me as I've adopted them. * patches 6, 9-11 are new. * patches 7, 8 were not part of v3 Changes from [v2]: * added canonicalization for user-provided paths; * fixed compilation issues when AppArmor support is enabled. Changes from [v1]: * documented more explicitly that the newly introduced option is intended for very specific scenarios and not general usage; as part of this, the NEWS update has been dropped too; * made a few tweaks and addressed a few oversight based on review feedback; * several preparatory cleanup patches have been pushed. Changes from [v0]: * reworked approach. [v5] https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/message/HNF… [v4] https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/message/FWR… [v3] https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/message/PIS… [v2] https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/thread/XPCP… [v1] https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/thread/XEIS… [v0] https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/thread/MMKV… [1] https://issues.redhat.com/browse/CNV-34322 [2] https://issues.redhat.com/browse/CNV-39370 Andrea Bolognani (7): security: Fix alignment qemu: Introduce shared_filesystems configuration option qemu: Propagate shared_filesystems utils: Use overrides in virFileIsSharedFS() qemu: Always set labels for TPM state security: Always forget labels for TPM state directory qemu: Don't lock TPM state directory for incoming migration Peter Krempa (6): virFileIsSharedFSOverride: Export virParseOwnershipIds: Refactor virSecuritySELinuxRestoreImageLabelInt: Move FD image relabeling after 'migrated' check security_(dac|selinux): Unref remembered security labels on outgoing migration storage_source: Add field for skipping seclabel remembering qemu: migration: Don't remember seclabel for images shared from current host src/conf/storage_source_conf.c | 3 + src/conf/storage_source_conf.h | 9 ++ src/libvirt_private.syms | 1 + src/lxc/lxc_controller.c | 3 +- src/lxc/lxc_driver.c | 2 +- src/lxc/lxc_process.c | 4 +- src/qemu/libvirtd_qemu.aug | 3 + src/qemu/qemu.conf.in | 26 +++++ src/qemu/qemu_conf.c | 31 ++++++ src/qemu/qemu_conf.h | 2 + src/qemu/qemu_domain.c | 7 +- src/qemu/qemu_extdevice.c | 2 +- src/qemu/qemu_migration.c | 86 ++++++++++++++--- src/qemu/qemu_security.c | 95 +++++++++++++----- src/qemu/qemu_security.h | 6 +- src/qemu/qemu_tpm.c | 50 ++++++---- src/qemu/qemu_tpm.h | 10 +- src/qemu/test_libvirtd_qemu.aug.in | 5 + src/security/security_apparmor.c | 8 +- src/security/security_dac.c | 53 +++++++++-- src/security/security_driver.h | 8 +- src/security/security_manager.c | 33 +++++-- src/security/security_manager.h | 9 +- src/security/security_nop.c | 5 + src/security/security_selinux.c | 148 +++++++++++++++++++++++------ src/security/security_stack.c | 32 +++++-- src/util/virfile.c | 63 +++++++++++- src/util/virfile.h | 5 +- src/util/virutil.c | 20 ++-- tests/securityselinuxlabeltest.c | 2 +- tests/virfiletest.c | 2 +- 31 files changed, 594 insertions(+), 139 deletions(-) -- 2.46.0

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[PATCH v2] domain_validate: Validate dma_translation for iommu models
by Han Han 02 Oct '24

02 Oct '24

The attribute dma_translation is only supported by intel-iommu device. Report an error when it is used for the other iommu devices. Fixes: 6866f958c1 Signed-off-by: Han Han <hhan(a)redhat.com> --- v2: update the tests v1: https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/thread/6CHF… src/conf/domain_validate.c | 3 ++- ...io-iommu-dma-translation.x86_64-latest.err | 1 + .../virtio-iommu-dma-translation.xml | 20 +++++++++++++++++++ tests/qemuxmlconftest.c | 1 + 4 files changed, 24 insertions(+), 1 deletion(-) create mode 100644 tests/qemuxmlconfdata/virtio-iommu-dma-translation.x86_64-latest.err create mode 100644 tests/qemuxmlconfdata/virtio-iommu-dma-translation.xml diff --git a/src/conf/domain_validate.c b/src/conf/domain_validate.c index eddb4a5e74..b8ae9ed79d 100644 --- a/src/conf/domain_validate.c +++ b/src/conf/domain_validate.c @@ -2980,7 +2980,8 @@ virDomainIOMMUDefValidate(const virDomainIOMMUDef *iommu) iommu->caching_mode != VIR_TRISTATE_SWITCH_ABSENT || iommu->eim != VIR_TRISTATE_SWITCH_ABSENT || iommu->iotlb != VIR_TRISTATE_SWITCH_ABSENT || - iommu->aw_bits != 0) { + iommu->aw_bits != 0 || + iommu->dma_translation != VIR_TRISTATE_SWITCH_ABSENT) { virReportError(VIR_ERR_XML_ERROR, _("iommu model '%1$s' doesn't support additional attributes"), virDomainIOMMUModelTypeToString(iommu->model)); diff --git a/tests/qemuxmlconfdata/virtio-iommu-dma-translation.x86_64-latest.err b/tests/qemuxmlconfdata/virtio-iommu-dma-translation.x86_64-latest.err new file mode 100644 index 0000000000..2c3a272725 --- /dev/null +++ b/tests/qemuxmlconfdata/virtio-iommu-dma-translation.x86_64-latest.err @@ -0,0 +1 @@ +XML error: iommu model 'virtio' doesn't support additional attributes diff --git a/tests/qemuxmlconfdata/virtio-iommu-dma-translation.xml b/tests/qemuxmlconfdata/virtio-iommu-dma-translation.xml new file mode 100644 index 0000000000..a3723f266b --- /dev/null +++ b/tests/qemuxmlconfdata/virtio-iommu-dma-translation.xml @@ -0,0 +1,20 @@ +<domain type='qemu'> + <name>QEMUGuest1</name> + <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid> + <memory unit='KiB'>219100</memory> + <vcpu placement='static'>1</vcpu> + <os> + <type arch='x86_64' machine='q35'>hvm</type> + </os> + <features> + <acpi/> + </features> + <devices> + <emulator>/usr/bin/qemu-system-x86_64</emulator> + <controller type='usb' model='none'/> + <memballoon model='none'/> + <iommu model='virtio'> + <driver dma_translation='on'/> + </iommu> + </devices> +</domain> diff --git a/tests/qemuxmlconftest.c b/tests/qemuxmlconftest.c index 61eb4cda75..dfcf67d2d0 100644 --- a/tests/qemuxmlconftest.c +++ b/tests/qemuxmlconftest.c @@ -2766,6 +2766,7 @@ mymain(void) DO_TEST_CAPS_LATEST_PARSE_ERROR("virtio-iommu-no-acpi"); DO_TEST_CAPS_LATEST_PARSE_ERROR("virtio-iommu-invalid-address-type"); DO_TEST_CAPS_LATEST_PARSE_ERROR("virtio-iommu-invalid-address"); + DO_TEST_CAPS_LATEST_PARSE_ERROR("virtio-iommu-dma-translation"); DO_TEST_CAPS_LATEST("cpu-hotplug-startup"); DO_TEST_CAPS_ARCH_LATEST_PARSE_ERROR("cpu-hotplug-granularity", "ppc64"); -- 2.46.1

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[PATCH 0/2] libxl_conf: Fix crashes in libxl config generation
by Rayhan Faizel 02 Oct '24

02 Oct '24

This patch series includes fixes for config generation of multiple serial devices and handling of unsupported graphics types. Both of these were discovered some time back using fuzzing techniques. Rayhan Faizel (2): libxl_conf: Fix config generation for multiple serial devices libxl_conf: Add check for unsupported graphics type src/libxl/libxl_conf.c | 15 +++-- .../multiple-serial.json | 63 +++++++++++++++++++ .../multiple-serial.xml | 47 ++++++++++++++ .../libxlxml2domconfigdata/single-serial.json | 52 +++++++++++++++ .../libxlxml2domconfigdata/single-serial.xml | 25 ++++++++ tests/libxlxml2domconfigtest.c | 3 + 6 files changed, 200 insertions(+), 5 deletions(-) create mode 100644 tests/libxlxml2domconfigdata/multiple-serial.json create mode 100644 tests/libxlxml2domconfigdata/multiple-serial.xml create mode 100644 tests/libxlxml2domconfigdata/single-serial.json create mode 100644 tests/libxlxml2domconfigdata/single-serial.xml -- 2.34.1

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[PATCH v3] docs: Mark "gluster" support in QEMU as deprecated
by Thomas Huth 02 Oct '24

02 Oct '24

According to https://marc.info/?l=fedora-devel-list&m=171934833215726 the GlusterFS development effectively ended. Thus mark it as deprecated in QEMU, so we can remove it in a future release if the project does not gain momentum again. Acked-by: Niels de Vos <ndevos(a)redhat.com> Acked-by: Markus Armbruster <armbru(a)redhat.com> Signed-off-by: Thomas Huth <thuth(a)redhat.com> --- v3: Some rewordings according to Markus' and Daniel's suggestions docs/about/deprecated.rst | 9 +++++++++ qapi/block-core.json | 8 +++++++- block/gluster.c | 2 ++ 3 files changed, 18 insertions(+), 1 deletion(-) diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index c0aa52def5..c41e55f710 100644 --- a/docs/about/deprecated.rst +++ b/docs/about/deprecated.rst @@ -414,6 +414,15 @@ Specifying the iSCSI password in plain text on the command line using the used instead, to refer to a ``--object secret...`` instance that provides a password via a file, or encrypted. +``gluster`` backend (since 9.2) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +According to https://marc.info/?l=fedora-devel-list&m=171934833215726 +the GlusterFS development effectively ended. Unless the development +gains momentum again, the QEMU project will remove the gluster backend +in a future release. + + Character device options '''''''''''''''''''''''' diff --git a/qapi/block-core.json b/qapi/block-core.json index c3b0a2376b..8181abef54 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -3192,12 +3192,18 @@ # # @snapshot-access: Since 7.0 # +# Features: +# +# @deprecated: Member @gluster is deprecated because GlusterFS +# development ceased. +# # Since: 2.9 ## { 'enum': 'BlockdevDriver', 'data': [ 'blkdebug', 'blklogwrites', 'blkreplay', 'blkverify', 'bochs', 'cloop', 'compress', 'copy-before-write', 'copy-on-read', 'dmg', - 'file', 'snapshot-access', 'ftp', 'ftps', 'gluster', + 'file', 'snapshot-access', 'ftp', 'ftps', + {'name': 'gluster', 'features': [ 'deprecated' ] }, {'name': 'host_cdrom', 'if': 'HAVE_HOST_BLOCK_DEVICE' }, {'name': 'host_device', 'if': 'HAVE_HOST_BLOCK_DEVICE' }, 'http', 'https', diff --git a/block/gluster.c b/block/gluster.c index f8b415f381..f03d05251e 100644 --- a/block/gluster.c +++ b/block/gluster.c @@ -809,6 +809,8 @@ static int qemu_gluster_open(BlockDriverState *bs, QDict *options, goto out; } + warn_report_once("'gluster' is deprecated"); + filename = qemu_opt_get(opts, GLUSTER_OPT_FILENAME); s->debug = qemu_opt_get_number(opts, GLUSTER_OPT_DEBUG, -- 2.46.1

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[libvirt PATCH 0/6] scripts: group-qemu-caps: improve readability
by Ján Tomko 02 Oct '24

02 Oct '24

Even though it still stays a Perl script at heart. Ján Tomko (6): scripts: group-qemu-caps: use read scripts: group-qemu-caps: remove cryptic bool scripts: group-qemu-caps: remove unecessary regex scripts: group-qemu-caps: separate file loading scripts: group-qemu-caps: regroup_caps: operate on split lines scripts: group-qemu-caps: separate file operations from the check scripts/group-qemu-caps.py | 120 +++++++++++++++++++++---------------- 1 file changed, 68 insertions(+), 52 deletions(-) -- 2.45.2

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[PATCH] vmx: support HPET timers configuration
by João Sena Ribeiro 02 Oct '24

02 Oct '24

All VMs are being created with no hpet timer defined. Check if the VM definition XML file enables HPET and reflect that on the VMX file. Signed-off-by: João Sena Ribeiro <joao.ribeiro(a)identity.pt> --- src/vmx/vmx.c | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) diff --git a/src/vmx/vmx.c b/src/vmx/vmx.c index de16c1f634..d7e116dd07 100644 --- a/src/vmx/vmx.c +++ b/src/vmx/vmx.c @@ -65,7 +65,7 @@ def->maxvcpus = <value> <=> numvcpus = "<value>" def->cpumask = <uint list> <=> sched.cpu.affinity = "<uint list>" def->cputune.shares = <value> <=> sched.cpu.shares = "<value>" # with handling for special values # "high", "normal", "low" - +def->ntimers <=> hpet.present = "<value>" # "true", "false" ################################################################################ @@ -3496,6 +3496,35 @@ virVMXFormatConfig(virVMXContext *ctx, virDomainXMLOption *xmlopt, virDomainDef } } + /* def:clock.ntimers */ + for (i = 0; i < def->clock.ntimers; i++) { + switch ((virDomainTimerNameType)def->clock.timers[i]->name) { + case VIR_DOMAIN_TIMER_NAME_HPET: + if (def->clock.timers[i]->present == VIR_TRISTATE_BOOL_YES) { + virBufferAddLit(&buffer, "hpet0.present = \"true\"\n"); + } else if (def->clock.timers[i]->present == VIR_TRISTATE_BOOL_NO) { + virBufferAddLit(&buffer, "hpet0.present = \"false\"\n"); + } + break; + + case VIR_DOMAIN_TIMER_NAME_TSC: + case VIR_DOMAIN_TIMER_NAME_PLATFORM: + case VIR_DOMAIN_TIMER_NAME_KVMCLOCK: + case VIR_DOMAIN_TIMER_NAME_HYPERVCLOCK: + case VIR_DOMAIN_TIMER_NAME_RTC: + case VIR_DOMAIN_TIMER_NAME_PIT: + case VIR_DOMAIN_TIMER_NAME_ARMVTIMER: + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("unsupported timer type (name) '%1$s'"), + virDomainTimerNameTypeToString(def->clock.timers[i]->name)); + goto cleanup; + + case VIR_DOMAIN_TIMER_NAME_LAST: + break; + + } + } + /* def:graphics */ for (i = 0; i < def->ngraphics; ++i) { switch (def->graphics[i]->type) { -- 2.34.1

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[PATCH] qemu: add hook script event "stop"
by Adam Julis 02 Oct '24

02 Oct '24

The "stop" hook is called when the process of stopping a guest started and it is known that the process can be completed (e.g. the guest is still active). Resolves: https://gitlab.com/libvirt/libvirt/-/issues/647 Signed-off-by: Adam Julis <ajulis(a)redhat.com> --- docs/hooks.rst | 14 +++++++++++--- src/qemu/qemu_process.c | 10 ++++++++++ src/util/virhook.c | 1 + src/util/virhook.h | 1 + 4 files changed, 23 insertions(+), 3 deletions(-) diff --git a/docs/hooks.rst b/docs/hooks.rst index 48128ba3d8..508d5afc4e 100644 --- a/docs/hooks.rst +++ b/docs/hooks.rst @@ -202,9 +202,17 @@ operation. There is no specific operation to indicate a "restart" is occurring. /etc/libvirt/hooks/qemu guest_name started begin - -- When a QEMU guest is stopped, the qemu hook script is called in two - locations, to match the startup. First, :since:`since 0.8.0`, the hook is - called before libvirt restores any labels: +- Before a QEMU guest is stopped, the qemu hook script is called in three + locations, to match the startup. First, :since:`since 10.8.0`, the hook is + called after libvirt checks that guest is still active and whole stopping + procedure should be run: + + :: + + /etc/libvirt/hooks/qemu guest_name stop begin - + + The second location, :since:`since 0.8.0`, the hook is called before libvirt + restores any labels: :: diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index 2e4ee9e305..f12c4a97a6 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -8615,6 +8615,7 @@ qemuProcessBeginStopJob(virDomainObj *vm, * is supposed to call qemuProcessStop (which will reset it after * 'vm->def->id' is set to -1) and/or qemuProcessEndStopJob to do proper * cleanup. */ + return 0; error: @@ -8676,6 +8677,15 @@ void qemuProcessStop(virQEMUDriver *driver, goto endjob; } + if (virHookPresent(VIR_HOOK_DRIVER_QEMU)) { + g_autofree char *xml = qemuDomainDefFormatXML(driver, NULL, vm->def, 0); + + /* we can't stop the operation even if the script raised an error */ + ignore_value(virHookCall(VIR_HOOK_DRIVER_QEMU, vm->def->name, + VIR_HOOK_QEMU_OP_STOP, VIR_HOOK_SUBOP_BEGIN, + NULL, xml, NULL)); + } + /* BEWARE: At this point 'vm->def->id' is not cleared yet. Any code that * requires the id (e.g. to call virDomainDefGetShortName()) must be placed * between here (after the VM is killed) and the statement clearing the id. diff --git a/src/util/virhook.c b/src/util/virhook.c index d012bb1825..01ba17e406 100644 --- a/src/util/virhook.c +++ b/src/util/virhook.c @@ -76,6 +76,7 @@ VIR_ENUM_IMPL(virHookSubop, VIR_ENUM_IMPL(virHookQemuOp, VIR_HOOK_QEMU_OP_LAST, "start", + "stop", "stopped", "prepare", "release", diff --git a/src/util/virhook.h b/src/util/virhook.h index d8237c837e..ea8c540c3f 100644 --- a/src/util/virhook.h +++ b/src/util/virhook.h @@ -52,6 +52,7 @@ typedef enum { typedef enum { VIR_HOOK_QEMU_OP_START, /* domain is about to start */ + VIR_HOOK_QEMU_OP_STOP, /* domain is about to stop */ VIR_HOOK_QEMU_OP_STOPPED, /* domain has stopped */ VIR_HOOK_QEMU_OP_PREPARE, /* domain startup initiated */ VIR_HOOK_QEMU_OP_RELEASE, /* domain destruction is over */ -- 2.45.2

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[PATCH 0/6] ch: handle events from cloud-hypervisor
by Purna Pavan Chandra Aekkaladevi 01 Oct '24

01 Oct '24

cloud-hypervisor raises various events, including VM lifecylce operations such as boot, shutdown, pause, resume, etc. Libvirt will now read these events and take the necessary actions, such as correctly updating the domain state. A FIFO file is passed to `--event-monitor` option of cloud-hypervisor. Libvirt creates a new thread that acts as the reader of the fifo file and continuously monitors for new events. Currently, shutdown events are handled by updating the domain state appropriately. Purna Pavan Chandra Aekkaladevi (6): utils: Implement virFileIsNamedPipe ch: pass --event-monitor option to cloud-hypervisor ch: start a new thread for handling ch events ch: events: Read and parse cloud-hypervisor events ch: events: facilitate lifecycle events handling NEWS: Mention event handling support in ch driver NEWS.rst | 7 + po/POTFILES | 1 + src/ch/ch_events.c | 337 +++++++++++++++++++++++++++++++++++++++ src/ch/ch_events.h | 54 +++++++ src/ch/ch_monitor.c | 48 +++++- src/ch/ch_monitor.h | 11 ++ src/ch/meson.build | 2 + src/libvirt_private.syms | 1 + src/util/virfile.c | 8 + src/util/virfile.h | 1 + 10 files changed, 466 insertions(+), 4 deletions(-) create mode 100644 src/ch/ch_events.c create mode 100644 src/ch/ch_events.h -- 2.34.1

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Release of libvirt-10.8.0
by Jiri Denemark 01 Oct '24

01 Oct '24

The 10.8.0 release of both libvirt and libvirt-python is tagged and signed tarballs are available at https://download.libvirt.org/ https://download.libvirt.org/python/ Thanks everybody who helped with this release by sending patches, reviewing, testing, or providing feedback. Your work is greatly appreciated. * Improvements * network: make networks with ``<forward mode='open'/>`` more useful It is now permissable to have a ``<forward mode='open'>`` network that has no IP address assigned to the host's port of the bridge. This is the only way to create a libvirt network where guests are unreachable from the host (and vice versa) and also 0 firewall rules are added on the host. It is now also possible for a ``<forward mode='open'/>`` network to use the ``zone`` attribute of ``<bridge>`` to set the firewalld zone of the bridge interface (normally it would not be set, as is done with other forward modes). * storage: Lessen dependancy on the ``showmount`` program Libvirt now automatically detects presence of ``showmount`` during runtime as we do with other helper programs and also the ``daemon-driver-storage-core`` RPM package now doesn't strongly depend on it if the users wish for a more minimal deployment. * Switch from YAJL to json-c for JSON parsing and formatting The parser and formatter in the libvirt library, as well as the parsers in the nss plugin were rewritten to use json-c instead of YAJL, which is effectively dead upstream. * Relax restrictions for memorytune settings It should now be possible to use resctrl on AMD CPUs as well as Intel CPUs when the resctrl filesystem is mounted with ``mba_MBps`` option. * Bug fixes * virsh: Fix script-friedly output of ``virsh list --uuid`` The script-friendly output of just 1 UUID per line was mistakenly replaced by the full human-targetted table view full of redundant information and very hard to parse. Users who wish to see the UUIDs in the tabular output need to use ``virsh list --table --uuid`` as old behaviour was reverted. Note that this also broke the ``libvirt-guests`` script. The bug was introduced in `v10.7.0 (2024-09-02)`_. * network/qemu: fix some cases where ``device-update`` of a network interface was failing: * If the interface was connected to a libvirt network that was providing a pool of VFs to be used with macvtap passthrough mode, then *any* update to the interface would fail, even changing the link state. Updating (the updateable parts of) a macvtap passthrough interface will now succeed. * It previously was not possible to move an interface from a Linux host bridge to an OVS bridge. This (and the opposite direction) now works. * qemu: backup: Fix possible crashes when running monitoring commands during backup job The qemu monitor code was fixed to not crash in specific cases when monitoing APIs are called during a backup job. * Fix various memleaks and overflows Multiple memory leaks and overflows in corner cases were fixed based on upstream issues reported. * network: Better cleanup after disappeared networks If a network disappeared while virtnetworkd was not running not all clean up was done properly once the daemon was started, especially when only the network interface disappeared. This could have in some cases resulted in the network being shown as inactive, but not being able to start. * qemu: Remember memory backing directory for domains If ``memory_backing_dir`` is changed during the lifetime of a domain with file backed memory, files in the old directory would not be cleaned up once the domain is shut down. Now the directory that was used during startup is remembered for each running domain. Enjoy. Jirka

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