October 2020 - Devel - libvirt List Archives

[libvirt][PATCH v1 0/1] introduce an attribute "migratable" to numatune memory element
by Luyao Zhong 14 Oct '20

14 Oct '20

RFC discussion record link: https://www.redhat.com/archives/libvir-list/2020-August/msg00960.html Luyao Zhong (1): introduce an attribute "migratable" to numatune memory element docs/formatdomain.rst | 8 +++- docs/schemas/domaincommon.rng | 5 +++ src/conf/numa_conf.c | 45 +++++++++++++++++++ src/conf/numa_conf.h | 3 ++ src/libvirt_private.syms | 1 + src/qemu/qemu_command.c | 6 ++- src/qemu/qemu_process.c | 21 +++++++++ .../numatune-memory-migratable.args | 34 ++++++++++++++ .../numatune-memory-migratable.err | 1 + .../numatune-memory-migratable.xml | 33 ++++++++++++++ tests/qemuxml2argvtest.c | 5 +++ 11 files changed, 160 insertions(+), 2 deletions(-) create mode 100644 tests/qemuxml2argvdata/numatune-memory-migratable.args create mode 100644 tests/qemuxml2argvdata/numatune-memory-migratable.err create mode 100644 tests/qemuxml2argvdata/numatune-memory-migratable.xml -- 2.25.4

3 3

[libvirt PATCH] qemu: remove some unnecessary local variables
by Jonathon Jongsma 14 Oct '20

14 Oct '20

These variables seem to be left over from a previous refactoring and they don't add anything to the code. Signed-off-by: Jonathon Jongsma <jjongsma(a)redhat.com> --- src/qemu/qemu_hotplug.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c index 2c184b9ba0..79fc8baa5c 100644 --- a/src/qemu/qemu_hotplug.c +++ b/src/qemu/qemu_hotplug.c @@ -5502,7 +5502,6 @@ qemuDomainDetachPrepRedirdev(virDomainObjPtr vm, virDomainRedirdevDefPtr match, virDomainRedirdevDefPtr *detach) { - virDomainRedirdevDefPtr redirdev; ssize_t idx; if ((idx = virDomainRedirdevDefFind(vm->def, match)) < 0) { @@ -5511,7 +5510,7 @@ qemuDomainDetachPrepRedirdev(virDomainObjPtr vm, return -1; } - *detach = redirdev = vm->def->redirdevs[idx]; + *detach = vm->def->redirdevs[idx]; return 0; } @@ -5523,12 +5522,11 @@ qemuDomainDetachPrepNet(virDomainObjPtr vm, virDomainNetDefPtr *detach) { int detachidx; - virDomainNetDefPtr net = NULL; if ((detachidx = virDomainNetFindIdx(vm->def, match)) < 0) return -1; - *detach = net = vm->def->nets[detachidx]; + *detach = vm->def->nets[detachidx]; return 0; } @@ -5598,7 +5596,6 @@ qemuDomainDetachPrepRNG(virDomainObjPtr vm, virDomainRNGDefPtr *detach) { ssize_t idx; - virDomainRNGDefPtr rng; if ((idx = virDomainRNGFind(vm->def, match)) < 0) { virReportError(VIR_ERR_DEVICE_MISSING, @@ -5608,7 +5605,7 @@ qemuDomainDetachPrepRNG(virDomainObjPtr vm, return -1; } - *detach = rng = vm->def->rngs[idx]; + *detach = vm->def->rngs[idx]; return 0; } @@ -5619,7 +5616,6 @@ qemuDomainDetachPrepMemory(virDomainObjPtr vm, virDomainMemoryDefPtr match, virDomainMemoryDefPtr *detach) { - virDomainMemoryDefPtr mem; int idx; if (qemuDomainMemoryDeviceAlignSize(vm->def, match) < 0) @@ -5633,7 +5629,7 @@ qemuDomainDetachPrepMemory(virDomainObjPtr vm, return -1; } - *detach = mem = vm->def->mems[idx]; + *detach = vm->def->mems[idx]; return 0; } -- 2.26.2

2 1

[PATCH 0/2] virtiofs can be used without NUMA
by Marc Hartmayer 14 Oct '20

14 Oct '20

Halil Pasic (1): Reflect in virtiofs.rst that virtiofs can be used without NUMA Marc Hartmayer (1): qemu: virtiofs can be used without NUMA nodes docs/kbase/virtiofs.rst | 17 ++++++++++++----- src/qemu/qemu_validate.c | 13 +++++++++---- 2 files changed, 21 insertions(+), 9 deletions(-) -- 2.25.4

2 4

[PATCH 0/2] qemu: Set noqueue qdisc for TAP devices
by Michal Privoznik 13 Oct '20

13 Oct '20

See 2/2 for detailed explanation. Long story short - we can squeeze more bandwidth from TAP devices we create for domains. Michal Prívozník (2): virnetdev: Introduce virNetDevSetRootQDisc() qemu: Set noqueue qdisc for TAP devices src/libvirt_private.syms | 1 + src/qemu/qemu_command.c | 2 ++ src/qemu/qemu_domain.c | 36 +++++++++++++++++++++++++++++++ src/qemu/qemu_domain.h | 4 ++++ src/qemu/qemu_hotplug.c | 2 ++ src/util/virnetdev.c | 46 ++++++++++++++++++++++++++++++++++++++++ src/util/virnetdev.h | 3 +++ 7 files changed, 94 insertions(+) -- 2.26.2

2 5

[PATCH] qemu_slirp: Check if helper exists before fetching its capabilities
by Michal Privoznik 13 Oct '20

13 Oct '20

I've noticed when running libvirtd in the session mode that whenever I start a virtual machine the following error is printed into logs: error : cannot execute binary /usr/bin/slirp-helper: No such file or directory The error message is produced in qemuSlirpNewForHelper() which does attempt to be a NO-OP if the helper doesn't exist by checking if its path is NULL, but that's not usually the case because in the default config (in virQEMUDriverConfigNew()) its path is initialized to QEMU_SLIRP_HELPER. And while it is true that during configure we try to get the actual path of the helper we fallback to the path above if not found. Fix the check so that the function checks whether the helper exists and is executable. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com> --- src/qemu/qemu_slirp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/qemu/qemu_slirp.c b/src/qemu/qemu_slirp.c index d2e4ed79be..4e5ab12727 100644 --- a/src/qemu/qemu_slirp.c +++ b/src/qemu/qemu_slirp.c @@ -101,7 +101,8 @@ qemuSlirpNewForHelper(const char *helper) virJSONValuePtr featuresJSON; size_t i, nfeatures; - if (!helper) + if (!helper || + !virFileIsExecutable(helper)) return NULL; slirp = qemuSlirpNew(); -- 2.26.2

3 2

[libvirt PATCH 0/4] vmx: start parsing SATA disks
by Pino Toscano 13 Oct '20

13 Oct '20

Try to parse SATA disks in VMware guests from their configs in VMX files. There are a couple of helper/cleanup commits to ease a bit the actual patches. Pino Toscano (4): vmx: hide private helpers vmx: shortcut 'cdrom-image' as CD-ROM earlier vmx: expand the disk array vmx: start parsing SATA disks src/libvirt_vmx.syms | 12 - src/vmx/vmx.c | 212 ++++++++++++++++-- src/vmx/vmx.h | 44 ---- .../vmx2xml-esx-in-the-wild-10.vmx | 101 +++++++++ .../vmx2xml-esx-in-the-wild-10.xml | 36 +++ .../vmx2xmldata/vmx2xml-esx-in-the-wild-8.xml | 6 + tests/vmx2xmltest.c | 1 + 7 files changed, 335 insertions(+), 77 deletions(-) create mode 100644 tests/vmx2xmldata/vmx2xml-esx-in-the-wild-10.vmx create mode 100644 tests/vmx2xmldata/vmx2xml-esx-in-the-wild-10.xml -- 2.26.2

2 5

[RFC] qemu: virtiofs can be used without NUMA nodes
by Marc Hartmayer 13 Oct '20

13 Oct '20

...if a machine memory-backend using shared memory is configured for the guest. This is especially important for QEMU machine types that don't have NUMA but virtiofs support. An example snippet: <domain type='kvm'> <name>test</name> <memory unit='KiB'>2097152</memory> <memoryBacking> <access mode='shared'/> </memoryBacking> <devices> <filesystem type='mount' accessmode='passthrough'> <driver type='virtiofs'/> <source dir='/tmp/test'/> <target dir='coffee'/> </filesystem> ... </devices> ... </domain> and the corresponding QEMU command line: /usr/bin/qemu-system-s390x \ -machine s390-ccw-virtio-5.2,memory-backend=s390.ram \ -m 2048 \ -object memory-backend-file,id=s390.ram,mem-path=/var/lib/libvirt/qemu/ram/46-test/s390.ram,share=yes,size=2147483648 \ ... Signed-off-by: Marc Hartmayer <mhartmay(a)linux.ibm.com> --- Note: There are still some TODOs left... e.g. adapt the virtiofs documentation of libvirt. --- src/qemu/qemu_validate.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c index a212605579d2..077a85b30802 100644 --- a/src/qemu/qemu_validate.c +++ b/src/qemu/qemu_validate.c @@ -3470,14 +3470,21 @@ qemuValidateDomainDeviceDefGraphics(const virDomainGraphicsDef *graphics, static int -qemuValidateDomainDefVirtioFSSharedMemory(const virDomainDef *def) +qemuValidateDomainDefVirtioFSSharedMemory(const virDomainDef *def, + virQEMUCapsPtr qemuCaps) { + const char *defaultRAMId = virQEMUCapsGetMachineDefaultRAMid(qemuCaps, + def->virtType, + def->os.machine); size_t numa_nodes = virDomainNumaGetNodeCount(def->numa); size_t i; - if (numa_nodes == 0) { + if (numa_nodes == 0 && + !(defaultRAMId && def->mem.access == VIR_DOMAIN_MEMORY_ACCESS_SHARED)) { + /* TODO do we need further checks here (e.g. check whether + * memory backend is supported by the QEMU binary)? */ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", - _("virtiofs requires one or more NUMA nodes")); + _("virtiofs requires shared memory")); return -1; } @@ -3591,7 +3598,7 @@ qemuValidateDomainDeviceDefFS(virDomainFSDefPtr fs, _("virtiofs does not support multidevs")); return -1; } - if (qemuValidateDomainDefVirtioFSSharedMemory(def) < 0) + if (qemuValidateDomainDefVirtioFSSharedMemory(def, qemuCaps) < 0) return -1; break; -- 2.25.4

2 2

Remove rpath from RPMs
by Daniel Letai 13 Oct '20

13 Oct '20

2 3

[libvirt PATCH] logging: allow max_len=0 to disable log rollover
by Daniel P. Berrangé 13 Oct '20

13 Oct '20

Currently setting max_len=0 causes virtlogd to spin in a busy loop. It is natural to allow this to disable log rollover which can be useful for developers debugging things. Note disabling rollover exposes the host to denial of service from a malicious guest, so must be used with care. Closes https://gitlab.com/libvirt/libvirt/-/issues/85 Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com> --- src/logging/virtlogd.conf | 4 ++++ src/util/virrotatingfile.c | 48 +++++++++++++++++++++----------------- 2 files changed, 30 insertions(+), 22 deletions(-) diff --git a/src/logging/virtlogd.conf b/src/logging/virtlogd.conf index 8b1ff0156f..c53a1112bd 100644 --- a/src/logging/virtlogd.conf +++ b/src/logging/virtlogd.conf @@ -87,6 +87,10 @@ # Maximum file size before rolling over. Defaults to 2 MB # +# Setting max_size to zero will disable rollover entirely. +# NOTE: disabling rollover exposes the host filesystem to +# denial of service from a malicious guest. +# # Beware that a logrotate config file might be installed too, # to handle cases where virtlogd is disabled. To ensure that # the logrotate config is a no-op when virtlogd is running, diff --git a/src/util/virrotatingfile.c b/src/util/virrotatingfile.c index a88c332cf4..9f1ef17c3e 100644 --- a/src/util/virrotatingfile.c +++ b/src/util/virrotatingfile.c @@ -225,7 +225,8 @@ virRotatingFileWriterDelete(virRotatingFileWriterPtr file) * * The files will never exceed @maxlen bytes in size, * but may be rolled over before they reach this size - * in order to avoid splitting lines + * in order to avoid splitting lines. If @maxlen is + * zero then no rollover will be performed. */ virRotatingFileWriterPtr virRotatingFileWriterNew(const char *path, @@ -430,25 +431,27 @@ virRotatingFileWriterAppend(virRotatingFileWriterPtr file, size_t towrite = len; bool forceRollover = false; - if (file->entry->pos > file->maxlen) { - /* If existing file is for some reason larger then max length we - * won't write to this file anymore, but we rollover this file.*/ - forceRollover = true; - towrite = 0; - } else if ((file->entry->pos + towrite) > file->maxlen) { - towrite = file->maxlen - file->entry->pos; - - /* - * If there's a newline in the last 80 chars - * we're about to write, then break at that - * point to avoid splitting lines across - * separate files - */ - for (i = 0; i < towrite && i < 80; i++) { - if (buf[towrite - i - 1] == '\n') { - towrite -= i; - forceRollover = true; - break; + if (file->maxlen != 0) { + if (file->entry->pos > file->maxlen) { + /* If existing file is for some reason larger then max length we + * won't write to this file anymore, but we rollover this file.*/ + forceRollover = true; + towrite = 0; + } else if ((file->entry->pos + towrite) > file->maxlen) { + towrite = file->maxlen - file->entry->pos; + + /* + * If there's a newline in the last 80 chars + * we're about to write, then break at that + * point to avoid splitting lines across + * separate files + */ + for (i = 0; i < towrite && i < 80; i++) { + if (buf[towrite - i - 1] == '\n') { + towrite -= i; + forceRollover = true; + break; + } } } } @@ -468,8 +471,9 @@ virRotatingFileWriterAppend(virRotatingFileWriterPtr file, file->entry->len += towrite; } - if ((file->entry->pos == file->maxlen && len) || - forceRollover) { + if (file->maxlen != 0 && + ((file->entry->pos == file->maxlen && len) || + forceRollover)) { virRotatingFileWriterEntryPtr tmp; VIR_DEBUG("Hit max size %zu on %s (force=%d)", file->maxlen, file->basepath, forceRollover); -- 2.26.2

2 1

[libvirt PATCH 0/2] fixes allocation issues leading to crashes
by Pavel Hrdina 13 Oct '20

13 Oct '20

Our libvirt-dbus tests discovered allocation issues introduced by recent rewrite to use g_new0 instead of VIR_ALLOC_N by allocating array one element shorter in some places which can lead to crashes of client applications counting on a fact that the returned arrays are NULL terminated. Pavel Hrdina (2): conf: fix g_new0 allocation conf: virsecretobj: fix g_new0 allocation src/conf/virinterfaceobj.c | 2 +- src/conf/virnetworkobj.c | 4 ++-- src/conf/virnodedeviceobj.c | 2 +- src/conf/virsecretobj.c | 2 +- 4 files changed, 5 insertions(+), 5 deletions(-) -- 2.26.2

4 5