[PATCH v3 1/1] qemu: Add support for RAPL MSRs feature

Add the support in libvirt to activate the RAPL feature in QEMU. This feature is activated with -accel kvm,rapl=true,path=/path/sock.sock in QEMU. The feature is activated in libvirt with the following XML configuration: <kvm> [...] <rapl state ='on' socket='/run/qemu-vmsr-helper.sock'/> [...] </kvm> See: https://gitlab.com/qemu-project/qemu/-/commit/0418f90809aea5b375c859e744c... Signed-off-by: Anthony Harivel <aharivel(a)redhat.com&gt; --- docs/formatdomain.rst | 2 ++ src/conf/domain_conf.c | 18 ++++++++++++++++++ src/conf/domain_conf.h | 2 ++ src/conf/schemas/domaincommon.rng | 10 ++++++++++ src/qemu/qemu_command.c | 12 ++++++++++++ tests/qemuxmlconfdata/kvm-features-off.xml | 1 + .../kvm-features.x86_64-latest.args | 2 +- tests/qemuxmlconfdata/kvm-features.xml | 1 + 8 files changed, 47 insertions(+), 1 deletion(-) diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst index 83aeaa32c296..eceee1531085 100644 --- a/docs/formatdomain.rst +++ b/docs/formatdomain.rst @@ -2016,6 +2016,7 @@ Hypervisors may allow certain CPU / machine features to be toggled on/off. <poll-control state='on'/> <pv-ipi state='off'/> <dirty-ring state='on' size='4096'/> + <rapl state ='on' socket='/run/qemu-vmsr-helper.sock'/> </kvm> <xen> <e820_host state='on'/> @@ -2135,6 +2136,7 @@ are: poll-control Decrease IO completion latency by introducing a grace period of busy waiting on, off :since:`6.10.0 (QEMU 4.2)` pv-ipi Paravirtualized send IPIs on, off :since:`7.10.0 (QEMU 3.1)` dirty-ring Enable dirty ring feature on, off; size - must be power of 2, range [1024,65536] :since:`8.0.0 (QEMU 6.1)` + rapl Enable rapl feature on, off; socket - rapl helper socket :since:`10.8.0 (QEMU 9.1)` ============== ============================================================================ ====================================================== ============================ ``xen`` diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 87f87bbe56b2..84239f38598d 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -224,6 +224,7 @@ VIR_ENUM_IMPL(virDomainKVM, "poll-control", "pv-ipi", "dirty-ring", + "rapl", ); VIR_ENUM_IMPL(virDomainXen, @@ -16837,6 +16838,11 @@ virDomainFeaturesKVMDefParse(virDomainDef *def, return -1; } } + + /* rapl feature should parse socket property */ + if (feature == VIR_DOMAIN_KVM_RAPL && value == VIR_TRISTATE_SWITCH_ON) { + def->kvm_features->rapl_helper_socket = virXMLPropString(feat, "socket"); + } } def->features[VIR_DOMAIN_FEATURE_KVM] = VIR_TRISTATE_SWITCH_ON; @@ -21308,6 +21314,7 @@ virDomainDefFeaturesCheckABIStability(virDomainDef *src, case VIR_DOMAIN_KVM_POLLCONTROL: case VIR_DOMAIN_KVM_PVIPI: case VIR_DOMAIN_KVM_DIRTY_RING: + case VIR_DOMAIN_KVM_RAPL: if (src->kvm_features->features[i] != dst->kvm_features->features[i]) { virReportError(VIR_ERR_CONFIG_UNSUPPORTED, _("State of KVM feature '%1$s' differs: source: '%2$s', destination: '%3$s'"), @@ -28107,6 +28114,17 @@ virDomainDefFormatFeatures(virBuffer *buf, } break; + case VIR_DOMAIN_KVM_RAPL: + if (def->kvm_features->features[j] != VIR_TRISTATE_SWITCH_ABSENT) { + virBufferAsprintf(&childBuf, "<%s state='%s'", + virDomainKVMTypeToString(j), + virTristateSwitchTypeToString(def->kvm_features->features[j])); + + virBufferEscapeString(&childBuf, " socket='%s'", def->kvm_features->rapl_helper_socket); + virBufferAddLit(&childBuf, "/>\n"); + } + break; + case VIR_DOMAIN_KVM_LAST: break; } diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index e51c74b6d18e..fef0f0a09c61 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -2241,6 +2241,7 @@ typedef enum { VIR_DOMAIN_KVM_POLLCONTROL, VIR_DOMAIN_KVM_PVIPI, VIR_DOMAIN_KVM_DIRTY_RING, + VIR_DOMAIN_KVM_RAPL, VIR_DOMAIN_KVM_LAST } virDomainKVM; @@ -2440,6 +2441,7 @@ struct _virDomainFeatureKVM { int features[VIR_DOMAIN_KVM_LAST]; unsigned int dirty_ring_size; /* size of dirty ring for each vCPU, no units */ + char *rapl_helper_socket; /* rapl helper socket */ }; typedef struct _virDomainFeatureTCG virDomainFeatureTCG; diff --git a/src/conf/schemas/domaincommon.rng b/src/conf/schemas/domaincommon.rng index 96cedb85e867..c910df8c75a0 100644 --- a/src/conf/schemas/domaincommon.rng +++ b/src/conf/schemas/domaincommon.rng @@ -8143,6 +8143,16 @@ </optional> </element> </optional> + <optional> + <element name="rapl"> + <ref name="featurestate"/> + <optional> + <attribute name="socket"> + <ref name="absFilePath"/> + </attribute> + </optional> + </element> + </optional> </interleave> </element> </define> diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 7370711918b6..e194a2dd2aa5 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -6437,6 +6437,9 @@ qemuBuildCpuCommandLine(virCommand *cmd, case VIR_DOMAIN_KVM_DIRTY_RING: break; + case VIR_DOMAIN_KVM_RAPL: + break; + case VIR_DOMAIN_KVM_LAST: break; } @@ -7062,6 +7065,15 @@ qemuBuildAccelCommandLine(virCommand *cmd, def->kvm_features->features[VIR_DOMAIN_KVM_DIRTY_RING] == VIR_TRISTATE_SWITCH_ON) { virBufferAsprintf(&buf, ",dirty-ring-size=%d", def->kvm_features->dirty_ring_size); } + + if (def->features[VIR_DOMAIN_FEATURE_KVM] == VIR_TRISTATE_SWITCH_ON && + def->kvm_features->features[VIR_DOMAIN_KVM_RAPL] == VIR_TRISTATE_SWITCH_ON) { + virBufferAddLit(&buf, ",rapl=true"); + + if (def->kvm_features->rapl_helper_socket != NULL) { + virBufferAsprintf(&buf, ",rapl-helper-socket=%s", def->kvm_features->rapl_helper_socket); + } + } break; case VIR_DOMAIN_VIRT_HVF: diff --git a/tests/qemuxmlconfdata/kvm-features-off.xml b/tests/qemuxmlconfdata/kvm-features-off.xml index 3cd4ff18f283..3e8dbea4b177 100644 --- a/tests/qemuxmlconfdata/kvm-features-off.xml +++ b/tests/qemuxmlconfdata/kvm-features-off.xml @@ -16,6 +16,7 @@ <poll-control state='off'/> <pv-ipi state='off'/> <dirty-ring state='off'/> + <rapl state='off'/> </kvm> </features> <cpu mode='host-passthrough' check='none' migratable='off'/> diff --git a/tests/qemuxmlconfdata/kvm-features.x86_64-latest.args b/tests/qemuxmlconfdata/kvm-features.x86_64-latest.args index 955db67eb4b7..2dd613ab338d 100644 --- a/tests/qemuxmlconfdata/kvm-features.x86_64-latest.args +++ b/tests/qemuxmlconfdata/kvm-features.x86_64-latest.args @@ -11,7 +11,7 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \ -S \ -object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-QEMUGuest1/master-key.aes"}' \ -machine pc,usb=off,dump-guest-core=off,memory-backend=pc.ram,acpi=on \ --accel kvm,dirty-ring-size=4096 \ +-accel kvm,dirty-ring-size=4096,rapl=true,rapl-helper-socket=/run/qemu-vmsr-helper.sock \ -cpu host,migratable=off,kvm=off,kvm-hint-dedicated=on,kvm-poll-control=on \ -m size=219136k \ -object '{"qom-type":"memory-backend-ram","id":"pc.ram","size":224395264}' \ diff --git a/tests/qemuxmlconfdata/kvm-features.xml b/tests/qemuxmlconfdata/kvm-features.xml index 78091064b109..ee601e06de75 100644 --- a/tests/qemuxmlconfdata/kvm-features.xml +++ b/tests/qemuxmlconfdata/kvm-features.xml @@ -16,6 +16,7 @@ <poll-control state='on'/> <pv-ipi state='on'/> <dirty-ring state='on' size='4096'/> + <rapl state='on' socket='/run/qemu-vmsr-helper.sock'/> </kvm> </features> <cpu mode='host-passthrough' check='none' migratable='off'/> -- 2.48.1