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[PATCH] util: virHostCPUGetStatsLinux: support VIR_NODE_CPU_STATS_GUEST
by Claudio Fontana 05 Sep '25

05 Sep '25

it is very useful for platforms to know how much time a node is spending running guests. Signed-off-by: Claudio Fontana <cfontana(a)suse.de> --- include/libvirt/libvirt-host.h | 10 ++++++++ src/test/test_driver.c | 9 +++++-- src/util/virhostcpu.c | 5 +++- tests/virhostcpudata/linux-cpustat-24cpu.out | 25 ++++++++++++++++++++ tools/virsh-host.c | 3 +++ 5 files changed, 49 insertions(+), 3 deletions(-) diff --git a/include/libvirt/libvirt-host.h b/include/libvirt/libvirt-host.h index 8922d00e0c..2b899144d3 100644 --- a/include/libvirt/libvirt-host.h +++ b/include/libvirt/libvirt-host.h @@ -267,6 +267,16 @@ typedef enum { */ # define VIR_NODE_CPU_STATS_INTR "intr" +/** + * VIR_NODE_CPU_STATS_GUEST: + * + * The cumulative CPU time spent running guests, + * since the node booting up (in nanoseconds). + * + * Since: 11.8.0 + */ +# define VIR_NODE_CPU_STATS_GUEST "guest" + /** * VIR_NODE_CPU_STATS_UTILIZATION: * diff --git a/src/test/test_driver.c b/src/test/test_driver.c index 25335d9002..1165689de7 100644 --- a/src/test/test_driver.c +++ b/src/test/test_driver.c @@ -4435,7 +4435,7 @@ static int testNodeGetCellsFreeMemory(virConnectPtr conn, return ret; } -#define TEST_NB_CPU_STATS 4 +#define TEST_NB_CPU_STATS 5 static int testNodeGetCPUStats(virConnectPtr conn G_GNUC_UNUSED, @@ -4453,7 +4453,7 @@ testNodeGetCPUStats(virConnectPtr conn G_GNUC_UNUSED, return 0; } - for (i = 0; i < *nparams && i < 4; i++) { + for (i = 0; i < *nparams && i < 5; i++) { switch (i) { case 0: if (virHostCPUStatsAssign(&params[i], @@ -4475,6 +4475,11 @@ testNodeGetCPUStats(virConnectPtr conn G_GNUC_UNUSED, VIR_NODE_CPU_STATS_IOWAIT, 763600000) < 0) return -1; break; + case 4: + if (virHostCPUStatsAssign(&params[i], + VIR_NODE_CPU_STATS_GUEST, 1797400000) < 0) + return -1; + break; } } diff --git a/src/util/virhostcpu.c b/src/util/virhostcpu.c index 5dbcc8987c..c3b4f87de1 100644 --- a/src/util/virhostcpu.c +++ b/src/util/virhostcpu.c @@ -182,7 +182,7 @@ virHostCPUGetStatsFreeBSD(int cpuNum, # define CPUINFO_PATH "/proc/cpuinfo" # define PROCSTAT_PATH "/proc/stat" -# define LINUX_NB_CPU_STATS 4 +# define LINUX_NB_CPU_STATS 5 int virHostCPUGetSocket(unsigned int cpu, unsigned int *socket) @@ -855,6 +855,9 @@ virHostCPUGetStatsLinux(FILE *procstat, iowait * TICK_TO_NSEC) < 0) return -1; + if (virHostCPUStatsAssign(&params[4], VIR_NODE_CPU_STATS_GUEST, + guest * TICK_TO_NSEC) < 0) + return -1; return 0; } } diff --git a/tests/virhostcpudata/linux-cpustat-24cpu.out b/tests/virhostcpudata/linux-cpustat-24cpu.out index 0a1a5bcd9a..f3183f5c41 100644 --- a/tests/virhostcpudata/linux-cpustat-24cpu.out +++ b/tests/virhostcpudata/linux-cpustat-24cpu.out @@ -3,148 +3,173 @@ kernel: 8751170 user: 14128079 idle: 1816344522 iowait: 81323 +guest: 5880634 cpu0: kernel: 447603 user: 749021 idle: 75399242 iowait: 5295 +guest: 331814 cpu1: kernel: 167215 user: 337326 idle: 76178612 iowait: 1121 +guest: 166726 cpu2: kernel: 308930 user: 666889 idle: 75649696 iowait: 4298 +guest: 272094 cpu3: kernel: 227674 user: 328464 idle: 76131634 iowait: 1219 +guest: 115551 cpu4: kernel: 299514 user: 583915 idle: 75746383 iowait: 3997 +guest: 253387 cpu5: kernel: 112287 user: 231867 idle: 76336319 iowait: 798 +guest: 118465 cpu6: kernel: 546590 user: 896252 idle: 75132665 iowait: 7210 +guest: 410328 cpu7: kernel: 177715 user: 342337 idle: 76154889 iowait: 1933 +guest: 204523 cpu8: kernel: 452773 user: 772479 idle: 75359327 iowait: 5845 +guest: 347169 cpu9: kernel: 1050230 user: 1079258 idle: 74532776 iowait: 3340 +guest: 150374 cpu10: kernel: 535495 user: 847295 idle: 75202362 iowait: 4038 +guest: 370309 cpu11: kernel: 171635 user: 323891 idle: 76181622 iowait: 993 +guest: 199566 cpu12: kernel: 331031 user: 683257 idle: 75587176 iowait: 5174 +guest: 293663 cpu13: kernel: 112686 user: 230633 idle: 76345295 iowait: 1367 +guest: 103907 cpu14: kernel: 251393 user: 547599 idle: 75824554 iowait: 5195 +guest: 207464 cpu15: kernel: 199044 user: 260673 idle: 76230586 iowait: 1379 +guest: 76655 cpu16: kernel: 244158 user: 463357 idle: 75923993 iowait: 6211 +guest: 184943 cpu17: kernel: 88571 user: 189253 idle: 76411610 iowait: 1388 +guest: 85456 cpu18: kernel: 546539 user: 875655 idle: 75096896 iowait: 5756 +guest: 408446 cpu19: kernel: 186366 user: 348768 idle: 76137323 iowait: 1299 +guest: 208604 cpu20: kernel: 449460 user: 765202 idle: 75348938 iowait: 4389 +guest: 353323 cpu21: kernel: 1045076 user: 1116075 idle: 74500557 iowait: 2411 +guest: 162678 cpu22: kernel: 534125 user: 847779 idle: 75178185 iowait: 5632 +guest: 376150 cpu23: kernel: 265029 user: 640815 idle: 75753872 iowait: 1026 +guest: 479032 diff --git a/tools/virsh-host.c b/tools/virsh-host.c index 51b71b512c..e918cfa4ca 100644 --- a/tools/virsh-host.c +++ b/tools/virsh-host.c @@ -743,6 +743,7 @@ typedef enum { VIRSH_CPU_IDLE, VIRSH_CPU_IOWAIT, VIRSH_CPU_INTR, + VIRSH_CPU_GUEST, VIRSH_CPU_USAGE, VIRSH_CPU_LAST } virshCPUStats; @@ -755,6 +756,7 @@ VIR_ENUM_IMPL(virshCPUStats, VIR_NODE_CPU_STATS_IDLE, VIR_NODE_CPU_STATS_IOWAIT, VIR_NODE_CPU_STATS_INTR, + VIR_NODE_CPU_STATS_GUEST, VIR_NODE_CPU_STATS_UTILIZATION); const char *virshCPUOutput[] = { @@ -763,6 +765,7 @@ const char *virshCPUOutput[] = { N_("idle:"), N_("iowait:"), N_("intr:"), + N_("guest:"), N_("usage:") }; -- 2.35.3

3 3

[PATCH] tests: Drop unused vm variable in testQemuMonitorCPUInfo
by Jiri Denemark 04 Sep '25

04 Sep '25

From: Jiri Denemark <jdenemar(a)redhat.com> Signed-off-by: Jiri Denemark <jdenemar(a)redhat.com> --- tests/qemumonitorjsontest.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/tests/qemumonitorjsontest.c b/tests/qemumonitorjsontest.c index 38779a20d0..65b14ca318 100644 --- a/tests/qemumonitorjsontest.c +++ b/tests/qemumonitorjsontest.c @@ -2360,7 +2360,6 @@ static int testQemuMonitorCPUInfo(const void *opaque) { const struct testCPUInfoData *data = opaque; - virDomainObj *vm = NULL; g_autofree char *queryCpusFile = NULL; g_autofree char *queryHotpluggableFile = NULL; g_autofree char *dataFile = NULL; @@ -2395,10 +2394,6 @@ testQemuMonitorCPUInfo(const void *opaque) if (qemuMonitorTestAddItem(test, "query-cpus-fast", queryCpusStr) < 0) goto cleanup; - vm = qemuMonitorTestGetDomainObj(test); - if (!vm) - goto cleanup; - rc = qemuMonitorGetCPUInfo(qemuMonitorTestGetMonitor(test), &vcpus, data->maxvcpus, true); -- 2.51.0

2 1

[PATCH 00/13] CH: Add disk hotplug support to Cloud Hypervisor domains
by Stefan Kober 04 Sep '25

04 Sep '25

This patchset adds the necessary functionality to support disk hotplugging in the CH driver. Some alias handling that can be extended to other device types is added, in order to allow detaching the devices via the Cloud Hypervisor API. Stefan Kober (13): ch: add DomainAttachDevice skeletons ch: add DomainDetachDevice skeletons ch: add ch_hotplug.{h,c} files to CH build ch: call into ch_hotplug implementation ch: pass disk alias to CHV ch: add ch_alias.{c,h} for device alias handling ch: add virCHMonitorPut function ch: use MonitorPut in MonitorPutNoContent ch: add disk attach functionality ch: assign aliases in ProcessPrepareDomain ch: Add virCHMonitorRemoveDevice function ch: implement disk device hot removal NEWS: announce disk hotplug support for ch NEWS.rst | 5 + po/POTFILES | 1 + src/ch/ch_alias.c | 59 ++++++++ src/ch/ch_alias.h | 27 ++++ src/ch/ch_driver.c | 86 ++++++++++++ src/ch/ch_hotplug.c | 333 ++++++++++++++++++++++++++++++++++++++++++++ src/ch/ch_hotplug.h | 33 +++++ src/ch/ch_monitor.c | 81 +++++++++-- src/ch/ch_monitor.h | 7 + src/ch/ch_process.c | 4 + src/ch/meson.build | 4 + 11 files changed, 630 insertions(+), 10 deletions(-) create mode 100644 src/ch/ch_alias.c create mode 100644 src/ch/ch_alias.h create mode 100644 src/ch/ch_hotplug.c create mode 100644 src/ch/ch_hotplug.h -- 2.50.1

4 20

[PATCHv2] passt: Define backend hostname and fqdn
by Enrique Llorente 03 Sep '25

03 Sep '25

This commit introduces a feature enhancement for configuring hostnames in virtual machines (VMs) using DHCP. It adds new options to the "passt" tool to set the hostname and fully qualified domain name (FQDN) for VMs. These map to DHCP option 12 for the hostname and options 81 (IPv4) and 39 (IPv6) for the FQDN. The update enables passt to dynamically assign hostnames to DHCP-aware VMs. To achieve this, the commit adds two fields to the passt domain XML backend. These fields allow passt to configure the hostname and FQDN for the virtual machine, ensuring smooth integration with the DHCP protocol. This improvement is particularly valuable in environments where VMs need dynamic hostname configuration, enhancing flexibility and automation in virtualized network setups. libvirt: Integrate passt --hostname --fqdn options Resolves: https://issues.redhat.com/browse/RHEL-79806 Signed-off-by: Enrique Llorente <ellorent(a)redhat.com> --- Compared to v1 this fix the mapping between backend fqdn and hostname docs/formatdomain.rst | 8 +++++--- src/conf/domain_conf.c | 10 +++++++++- src/conf/domain_conf.h | 2 ++ src/conf/schemas/domaincommon.rng | 6 ++++++ src/qemu/qemu_passt.c | 6 ++++++ tests/qemuxmlconfdata/net-user-passt.x86_64-7.2.0.xml | 2 +- tests/qemuxmlconfdata/net-user-passt.x86_64-latest.xml | 2 +- tests/qemuxmlconfdata/net-user-passt.xml | 2 +- .../net-vhostuser-passt.x86_64-latest.xml | 2 +- tests/qemuxmlconfdata/net-vhostuser-passt.xml | 2 +- 10 files changed, 33 insertions(+), 9 deletions(-) diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst index 8753ee9c23..9c80aa9270 100644 --- a/docs/formatdomain.rst +++ b/docs/formatdomain.rst @@ -5372,10 +5372,12 @@ came from the host's IP. There are a few other options that are configurable only for the passt backend. For example, the ``<backend>`` attribute ``logFile`` can be used to tell the passt process for this interface where to write its -message log, and the ``<source>`` attribute ``dev`` can tell it a +message log, the ``<source>`` attribute ``dev`` can tell it a particular host interface to use when deriving the routes given to the -guest for forwarding traffic upstream. Due to the design decisions of -passt, when using SELinux on the host, it is recommended that the log +guest for forwarding traffic upstream and the ``hostname`` and ``fqdn`` +will conigure the DHCP option 12 hostname and DHCP option 81 and DHCPv6 +option 39 fqdn attribute. Due to the design decisions of passt, when using +SELinux on the host, it is recommended that the log file reside in the runtime directory of the user under which the passt process will run, most probably ``/run/user/$UID`` (where ``$UID`` is the UID of that user), e.g. ``/run/user/1000``. Be aware that libvirt diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index b3b0bd7329..15143f8fa2 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -2909,6 +2909,8 @@ virDomainNetDefFree(virDomainNetDef *def) g_free(def->backend.tap); g_free(def->backend.vhost); g_free(def->backend.logFile); + g_free(def->backend.hostname); + g_free(def->backend.fqdn); virDomainNetTeamingInfoFree(def->teaming); g_free(def->virtPortProfile); g_free(def->script); @@ -9757,6 +9759,8 @@ virDomainNetBackendParseXML(xmlNodePtr node, } def->backend.logFile = virXMLPropString(node, "logFile"); + def->backend.hostname = virXMLPropString(node, "hostname"); + def->backend.fqdn = virXMLPropString(node, "fqdn"); if (tap) def->backend.tap = virFileSanitizePath(tap); @@ -20757,7 +20761,9 @@ virDomainNetBackendIsEqual(virDomainNetBackend *src, if (src->type != dst->type || STRNEQ_NULLABLE(src->tap, dst->tap) || STRNEQ_NULLABLE(src->vhost, dst->vhost) || - STRNEQ_NULLABLE(src->logFile, dst->logFile)) { + STRNEQ_NULLABLE(src->logFile, dst->logFile) || + STRNEQ_NULLABLE(src->hostname, dst->hostname) || + STRNEQ_NULLABLE(src->fqdn, dst->fqdn)) { return false; } return true; @@ -24838,6 +24844,8 @@ virDomainNetBackendFormat(virBuffer *buf, virBufferEscapeString(&attrBuf, " tap='%s'", backend->tap); virBufferEscapeString(&attrBuf, " vhost='%s'", backend->vhost); virBufferEscapeString(&attrBuf, " logFile='%s'", backend->logFile); + virBufferEscapeString(&attrBuf, " hostname='%s'", backend->hostname); + virBufferEscapeString(&attrBuf, " fqdn='%s'", backend->fqdn); virXMLFormatElement(buf, "backend", &attrBuf, NULL); } diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index 58b97a2b54..79fd2f1f63 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -1067,6 +1067,8 @@ struct _virDomainNetBackend { char *vhost; /* The following are currently only valid/used when backend type='passt' */ char *logFile; /* path to logfile used by passt process */ + char *hostname; /* hostname of the passt process */ + char *fqdn; /* fully qualified domain name of the passt process */ }; struct _virDomainNetPortForwardRange { diff --git a/src/conf/schemas/domaincommon.rng b/src/conf/schemas/domaincommon.rng index 5597d5a66b..f64199ca18 100644 --- a/src/conf/schemas/domaincommon.rng +++ b/src/conf/schemas/domaincommon.rng @@ -3913,6 +3913,12 @@ <ref name="absFilePath"/> </attribute> </optional> + <optional> + <attribute name="hostname"/> + </optional> + <optional> + <attribute name="fqdn"/> + </optional> </element> </optional> <optional> diff --git a/src/qemu/qemu_passt.c b/src/qemu/qemu_passt.c index fcc34de384..81e5c51f6c 100644 --- a/src/qemu/qemu_passt.c +++ b/src/qemu/qemu_passt.c @@ -229,6 +229,12 @@ qemuPasstStart(virDomainObj *vm, if (net->backend.logFile) virCommandAddArgList(cmd, "--log-file", net->backend.logFile, NULL); + if (net->backend.hostname) + virCommandAddArgList(cmd, "--hostname", net->backend.hostname, NULL); + + if (net->backend.fqdn) + virCommandAddArgList(cmd, "--fqdn", net->backend.fqdn, NULL); + /* Add IP address info */ for (i = 0; i < net->guestIP.nips; i++) { const virNetDevIPAddr *ip = net->guestIP.ips[i]; diff --git a/tests/qemuxmlconfdata/net-user-passt.x86_64-7.2.0.xml b/tests/qemuxmlconfdata/net-user-passt.x86_64-7.2.0.xml index cfe07cc627..77da297936 100644 --- a/tests/qemuxmlconfdata/net-user-passt.x86_64-7.2.0.xml +++ b/tests/qemuxmlconfdata/net-user-passt.x86_64-7.2.0.xml @@ -50,7 +50,7 @@ <range start='443' to='344'/> </portForward> <model type='rtl8139'/> - <backend type='passt' logFile='/var/log/loglaw.blog'/> + <backend type='passt' logFile='/var/log/loglaw.blog' hostname='hostname1' fqdn='hostname1.test.local'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </interface> <input type='mouse' bus='ps2'/> diff --git a/tests/qemuxmlconfdata/net-user-passt.x86_64-latest.xml b/tests/qemuxmlconfdata/net-user-passt.x86_64-latest.xml index d7e0ef5f90..917a9edaa0 100644 --- a/tests/qemuxmlconfdata/net-user-passt.x86_64-latest.xml +++ b/tests/qemuxmlconfdata/net-user-passt.x86_64-latest.xml @@ -50,7 +50,7 @@ <range start='443' to='344'/> </portForward> <model type='rtl8139'/> - <backend type='passt' logFile='/var/log/loglaw.blog'/> + <backend type='passt' logFile='/var/log/loglaw.blog' hostname='hostname1' fqdn='hostname1.test.local'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </interface> <input type='mouse' bus='ps2'/> diff --git a/tests/qemuxmlconfdata/net-user-passt.xml b/tests/qemuxmlconfdata/net-user-passt.xml index 20c9f50542..80d15de2ed 100644 --- a/tests/qemuxmlconfdata/net-user-passt.xml +++ b/tests/qemuxmlconfdata/net-user-passt.xml @@ -47,7 +47,7 @@ <range start='443' to='344'/> </portForward> <model type='rtl8139'/> - <backend type='passt' logFile='/var/log/loglaw.blog'/> + <backend type='passt' logFile='/var/log/loglaw.blog' hostname='hostname1' fqdn='hostname1.test.local'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </interface> <input type='mouse' bus='ps2'/> diff --git a/tests/qemuxmlconfdata/net-vhostuser-passt.x86_64-latest.xml b/tests/qemuxmlconfdata/net-vhostuser-passt.x86_64-latest.xml index 529aff11f8..5802754c4b 100644 --- a/tests/qemuxmlconfdata/net-vhostuser-passt.x86_64-latest.xml +++ b/tests/qemuxmlconfdata/net-vhostuser-passt.x86_64-latest.xml @@ -53,7 +53,7 @@ <range start='443' to='344'/> </portForward> <model type='virtio'/> - <backend type='passt' logFile='/var/log/loglaw.blog'/> + <backend type='passt' logFile='/var/log/loglaw.blog' hostname='hostname1' fqdn='hostname1.test.local'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </interface> <interface type='vhostuser'> diff --git a/tests/qemuxmlconfdata/net-vhostuser-passt.xml b/tests/qemuxmlconfdata/net-vhostuser-passt.xml index 71b845329b..0a37511a0f 100644 --- a/tests/qemuxmlconfdata/net-vhostuser-passt.xml +++ b/tests/qemuxmlconfdata/net-vhostuser-passt.xml @@ -50,7 +50,7 @@ <range start='443' to='344'/> </portForward> <model type='virtio'/> - <backend type='passt' logFile='/var/log/loglaw.blog'/> + <backend type='passt' logFile='/var/log/loglaw.blog' hostname='hostname1' fqdn='hostname1.test.local'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </interface> <interface type='vhostuser'> -- 2.49.0

6 12

[PATCH v2 00/13] CH: Add disk hotplug support to Cloud Hypervisor domains
by Stefan Kober 02 Sep '25

02 Sep '25

This patchset adds the necessary functionality to support disk hotplugging in the CH driver. Some alias handling that can be extended to other device types is added, in order to allow detaching the devices via the Cloud Hypervisor API. Stefan Kober (13): ch: add DomainAttachDevice skeletons ch: add DomainDetachDevice skeletons ch: add ch_hotplug.{h,c} files to CH build ch: call into ch_hotplug implementation ch: pass disk alias to CHV ch: add ch_alias.{c,h} for device alias handling ch: add virCHMonitorPut function ch: use MonitorPut in MonitorPutNoContent ch: add disk attach functionality ch: assign aliases in ProcessPrepareDomain ch: Add virCHMonitorRemoveDevice function ch: implement disk device hot removal NEWS: announce disk hotplug support for ch NEWS.rst | 5 + po/POTFILES | 1 + src/ch/ch_alias.c | 59 ++++++++ src/ch/ch_alias.h | 27 ++++ src/ch/ch_driver.c | 86 ++++++++++++ src/ch/ch_hotplug.c | 333 ++++++++++++++++++++++++++++++++++++++++++++ src/ch/ch_hotplug.h | 33 +++++ src/ch/ch_monitor.c | 81 +++++++++-- src/ch/ch_monitor.h | 7 + src/ch/ch_process.c | 4 + src/ch/meson.build | 4 + 11 files changed, 630 insertions(+), 10 deletions(-) create mode 100644 src/ch/ch_alias.c create mode 100644 src/ch/ch_alias.h create mode 100644 src/ch/ch_hotplug.c create mode 100644 src/ch/ch_hotplug.h -- 2.50.1

2 14

[PATCH v3 1/1] docs : add doc on cpu model and features
by Hector Cao 02 Sep '25

02 Sep '25

Add documentation on the way libvirt displays the Host CPU model and capabilities (features). There is an implicit expectation from users to get the CPU model name matching the CPU model they are running on, however, this does not happen most of the time. As a consequence, having a documentation is useful both for users to align their expectation and for us to point to a place where the situation is clearly explained. Signed-off-by: Hector Cao <hector.cao(a)canonical.com> --- docs/formatcaps.rst | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/docs/formatcaps.rst b/docs/formatcaps.rst index 7e525487e7..3cf83b7c6a 100644 --- a/docs/formatcaps.rst +++ b/docs/formatcaps.rst @@ -97,6 +97,50 @@ The ``<host/>`` element consists of the following child elements: parse this element. In contrast with the former elements, this is repeated for each security model the libvirt daemon currently supports. +Host CPU model and features +^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +As described previously in this section, libvirt exposes to +users the list of Host CPU features. Libvirt has a special way to +expose this list: Instead of providing the full (and thereby often +very long) set of features, libvirt specifies a CPU model as +baseline and additional features on top of it (as can be seen in +`Examples`_ where the baseline is ``Skylake-Client-noTSX-IBRS``). + +The ideal case would be that the baseline CPU model definition matches +exactly the CPU present in the system, and no additional feature is +needed to express the capabilities of the CPU. For example, if you are +running on a Server CPU you bought as ``Icelake`` type, the returned +CPU model name could be ``Icelake-Server``. However, this ideal +situation rarely happens, for two main reasons: + +- Manufacturers do not ship a single type of CPU under a given name, + there are various different SKUs with different features under the + same name. Yet it is not practical to have a database listing all of + those variants. + +- Some features might be in the hardware but unavailable for various + reasons (BIOS and kernel configuration, disabled for security, + ...). One typical example where this situation happens is related to + the `TSX mitigation <https://docs.kernel.org/arch/x86/tsx_async_abort.html>`__. + As a mitigation to the TAA side channel attack, the Linux kernel disables + by default TSX and its 2 features, ``rtm`` and ``hle``. Since many Linux + distributions keep this safer default behavior, these 2 features appear + as missing. + +Because for backward compatibility reasons, host capabilities cannot +list features that would need to be removed from the baseline model to +describe the host CPU, libvirt has to often use a rather old CPU +model, for example, ``Broadwell`` rather than ``Icelake``. Therefore, +users *shouldnot* expect the reported CPU model name to have any +implications other than that of a named baseline to build the complete +available feature set of the Host CPU. + +`Domain capabilities <formatdomaincaps.html#cpu-configuration>`_ do +not have such limitation, and the ``host-model`` CPU definition would +show the correct CPU model in almost all cases. + + Guest capabilities ~~~~~~~~~~~~~~~~~~ -- 2.45.2

2 1

[PATCH 0/3] hw/sd/sdcard: Deprecate support for spec v1.10
by Philippe Mathieu-Daudé 02 Sep '25

02 Sep '25

Deprecate SD spec v1.10, use v3.01 as new default. Philippe Mathieu-Daudé (3): hw/sd/sdcard: Deprecate support for spec v1.10 hw/sd/sdcard: Use spec v3.01 by default hw/sd/sdcard: Remove support for spec v1.10 docs/about/removed-features.rst | 5 +++++ include/hw/sd/sd.h | 1 - hw/sd/sd.c | 14 +++----------- 3 files changed, 8 insertions(+), 12 deletions(-) -- 2.41.0

2 10

[PATCH v2] qapi: net/tap: deprecate vhostforce option
by Vladimir Sementsov-Ogievskiy 01 Sep '25

01 Sep '25

This option doesn't make sense since long ago (10 years!) commit 1e7398a140f7a6 ("vhost: enable vhost without without MSI-X"). Prior 1e7398a140f7a6, to enable vhost for some specific kind of guests (that don't have MSI-X support), you should have set vhostforce=on (with vhost=on or unset). Since 1e7398a140f7a6, guest type doesn't matter, all guests are equal for vhost-enabling options logic. The current logic is: vhost=on / vhost=off : vhostforce ignored, doesn't make sense vhost unset : vhostforce counts, enabling vhost Currently you may enable vhost several ways: - vhost=on - vhostforce=on - vhost=on + vhostforce=on - and even vhost=on + vhostforce=off - they are all equal. Let's finally deprecate the extra option. Also, fix @vhostforce documentation. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov(a)yandex-team.ru> --- v2: - improve wording - add documentation fix docs/about/deprecated.rst | 7 +++++++ qapi/net.json | 11 +++++++++-- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index d50645a071..b17a5a41aa 100644 --- a/docs/about/deprecated.rst +++ b/docs/about/deprecated.rst @@ -516,6 +516,13 @@ Stream ``reconnect`` (since 9.2) The ``reconnect`` option only allows specifying second granularity timeouts, which is not enough for all types of use cases, use ``reconnect-ms`` instead. +TAP ``vhostforce`` (since 10.2) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +The ``vhostforce`` option is redundant with the ``vhost`` option. +If they conflict, ``vhost`` takes precedence. Just use ``vhost``. + + VFIO device options ''''''''''''''''''' diff --git a/qapi/net.json b/qapi/net.json index 78bcc9871e..e89c7aff5f 100644 --- a/qapi/net.json +++ b/qapi/net.json @@ -346,13 +346,20 @@ # @vhostfds: file descriptors of multiple already opened vhost net # devices # -# @vhostforce: vhost on for non-MSIX virtio guests +# @vhostforce: enable vhost-net network accelerator. Ignored when +# @vhost is set. # # @queues: number of queues to be created for multiqueue capable tap # # @poll-us: maximum number of microseconds that could be spent on busy # polling for tap (since 2.7) # +# Features: +# +# @deprecated: Member @vhostforce is deprecated. The @vhostforce +# option is redundant with the @vhost option. If they conflict, +# @vhost takes precedence. Just use @vhost. +# # Since: 1.2 ## { 'struct': 'NetdevTapOptions', @@ -369,7 +376,7 @@ '*vhost': 'bool', '*vhostfd': 'str', '*vhostfds': 'str', - '*vhostforce': 'bool', + '*vhostforce': { 'type': 'bool', 'features': [ 'deprecated' ] }, '*queues': 'uint32', '*poll-us': 'uint32'} } -- 2.48.1

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[PATCH] qapi: net/tap: deprecate vhostforce option
by Vladimir Sementsov-Ogievskiy 01 Sep '25

01 Sep '25

This option simply duplicates the @vhost option since long ago (10 years!) commit 1e7398a140f7a6 ("vhost: enable vhost without without MSI-X"). Let's finally deprecate it. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov(a)yandex-team.ru> --- docs/about/deprecated.rst | 7 +++++++ qapi/net.json | 6 +++++- 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index d50645a071..d14cb37480 100644 --- a/docs/about/deprecated.rst +++ b/docs/about/deprecated.rst @@ -516,6 +516,13 @@ Stream ``reconnect`` (since 9.2) The ``reconnect`` option only allows specifying second granularity timeouts, which is not enough for all types of use cases, use ``reconnect-ms`` instead. +TAP ``vhostforce`` (since 10.2) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +The ``vhostforce`` option just duplicates the main ``vhost`` option. +Use ``vhost`` alone. + + VFIO device options ''''''''''''''''''' diff --git a/qapi/net.json b/qapi/net.json index 78bcc9871e..d1216bb60a 100644 --- a/qapi/net.json +++ b/qapi/net.json @@ -353,6 +353,10 @@ # @poll-us: maximum number of microseconds that could be spent on busy # polling for tap (since 2.7) # +# Features: +# +# @deprecated: Member @vhostforce is deprecated. Simply use @vhost. +# # Since: 1.2 ## { 'struct': 'NetdevTapOptions', @@ -369,7 +373,7 @@ '*vhost': 'bool', '*vhostfd': 'str', '*vhostfds': 'str', - '*vhostforce': 'bool', + '*vhostforce': { 'type': 'bool', 'features': [ 'deprecated' ] }, '*queues': 'uint32', '*poll-us': 'uint32'} } -- 2.48.1

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[PATCH 0/8] qemu-replies-tool: Improvements for .replies comparison
by Peter Krempa 01 Sep '25

01 Sep '25

Add few more stable dumps to help comparing two .replies files (especially useful when updating to new git versions of qemu) Peter Krempa (8): scripts: qemu-replies-tool: Convert the QMP conversation to list of dicts scripts: qemu-replies-tool: Drop specific invocation of marginally useful dump modes scripts: qemu-replies-tool: Dump machine types in --dump-all scripts: qemu-replies-tool: List also data from 'qom-list-properties' scripts: qemu-replies-tool: Prefix output with filename when dumping data for multiple files scripts: qemu-replies-tool: Dump data from query-version/query-target/query-kvm scripts: qemu-replies-tool: Add stable dump of 'query-command-line-options' scripts: qemu-replies-tool: Add option to dump JSON commands that weren't processed by --dump-all scripts/qemu-replies-tool.py | 271 ++++++++++++++++++++++++++--------- 1 file changed, 207 insertions(+), 64 deletions(-) -- 2.51.0

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