This commit introduces a new capability that reflects virtio-mem-pci device support in QEMU: QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI, /* -device virtio-mem-pci */ The virtio-mem-pci device was introduced in QEMU 5.1. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/qemu/qemu_capabilities.c | 2 ++ src/qemu/qemu_capabilities.h | 1 + tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml | 1 + tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml | 1 + 4 files changed, 5 insertions(+) diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c index d656732c3e..0be7a24c9a 100644 --- a/src/qemu/qemu_capabilities.c +++ b/src/qemu/qemu_capabilities.c @@ -610,6 +610,7 @@ VIR_ENUM_IMPL(virQEMUCaps, "dc390", "am53c974", "virtio-pmem-pci", + "virtio-mem-pci", ); @@ -1327,6 +1328,7 @@ struct virQEMUCapsStringFlags virQEMUCapsObjectTypes[] = { { "dc390", QEMU_CAPS_SCSI_DC390 }, { "am53c974", QEMU_CAPS_SCSI_AM53C974 }, { "virtio-pmem-pci", QEMU_CAPS_DEVICE_VIRTIO_PMEM_PCI }, + { "virtio-mem-pci", QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI }, }; diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h index a14a78f959..76c7465c0e 100644 --- a/src/qemu/qemu_capabilities.h +++ b/src/qemu/qemu_capabilities.h @@ -590,6 +590,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */ QEMU_CAPS_SCSI_DC390, /* -device dc-390 */ QEMU_CAPS_SCSI_AM53C974, /* -device am53c974 */ QEMU_CAPS_DEVICE_VIRTIO_PMEM_PCI, /* -device virtio-pmem-pci */ + QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI, /* -device virtio-mem-pci */ QEMU_CAPS_LAST /* this must always be the last item */ } virQEMUCapsFlags; diff --git a/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml index 07466093c9..a54806fb0c 100644 --- a/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml +++ b/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml @@ -250,6 +250,7 @@ <flag name='dc390'/> <flag name='am53c974'/> <flag name='virtio-pmem-pci'/> + <flag name='virtio-mem-pci'/> <version>5001000</version> <kvmVersion>0</kvmVersion> <microcodeVersion>43100242</microcodeVersion> diff --git a/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml index dea2ff4b54..1bbc38297d 100644 --- a/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml +++ b/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml @@ -251,6 +251,7 @@ <flag name='dc390'/> <flag name='am53c974'/> <flag name='virtio-pmem-pci'/> + <flag name='virtio-mem-pci'/> <version>5002000</version> <kvmVersion>0</kvmVersion> <microcodeVersion>43100243</microcodeVersion> -- 2.26.2

The virtio-mem is paravirtualized mechanism of adding/removing memory to/from a VM. A virtio-mem-pci device is split into blocks of equal size which are then exposed (all or only a requested portion of them) to the guest kernel to use as regular memory. Therefore, the device has two important attributes: 1) block-size, which defines the size of a block 2) requested-size, which defines how much memory (in bytes) is the device requested to expose to the guest. The 'block-size' is configured on command line and immutable throughout device's lifetime. The 'requested-size' can be set on the command line too, but also is adjustable via monitor. In fact, that is how management software places its requests to change the memory allocation. If it wants to give more memory to the guest it changes 'requested-size' to a bigger value, and if it wants to shrink guest memory it changes the 'requested-size' to a smaller value. Note, value of zero means that guest should release all memory offered by the device. Of course, guest has to cooperate. Therefore, there is a third attribute 'size' which is read only and reflects how much memory the guest still has. This can be different to 'requested-size', obviously. Because of name clash, I've named it 'actualsize' and it is dealt with in future commits (it is a runtime information anyway). In the backend, memory for virtio-mem is backed by usual objects: memory-backend-{ram,file,memfd} and their size puts the cap on the amount of memory that a virtio-mem device can offer to a guest. But we are already able to express this info using <size/> under <target/>. Therefore, we need only two more elements to cover 'block-size' and 'requested-size' attributes. This is the XML I've came up with: <memory model='virtio-mem'> <source> <nodemask>1-3</nodemask> <pagesize unit='KiB'>2048</pagesize> </source> <target> <size unit='KiB'>2097152</size> <node>0</node> <block unit='KiB'>2048</block> <requested unit='KiB'>1048576</requested> </target> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </memory> I hope by now it is obvious that: 1) 'requested-size' must be an integer multiple of 'block-size', and 2) virtio-mem-pci device goes onto PCI bus and thus needs PCI address. Then there is a limitation that the minimal 'block-size' is transparent huge page size (I'll leave this without explanation). Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- docs/formatdomain.rst | 35 ++++++++-- docs/schemas/domaincommon.rng | 11 ++++ src/conf/domain_conf.c | 53 ++++++++++++++- src/conf/domain_conf.h | 3 + src/conf/domain_validate.c | 39 +++++++++++ src/qemu/qemu_alias.c | 1 + src/qemu/qemu_command.c | 1 + src/qemu/qemu_domain.c | 10 +++ src/qemu/qemu_domain_address.c | 37 ++++++++--- src/qemu/qemu_validate.c | 8 +++ src/security/security_apparmor.c | 1 + src/security/security_dac.c | 2 + src/security/security_selinux.c | 2 + tests/domaincapsmock.c | 9 +++ .../memory-hotplug-virtio-mem.xml | 66 +++++++++++++++++++ ...emory-hotplug-virtio-mem.x86_64-latest.xml | 1 + tests/qemuxml2xmltest.c | 1 + 17 files changed, 264 insertions(+), 16 deletions(-) create mode 100644 tests/qemuxml2argvdata/memory-hotplug-virtio-mem.xml create mode 120000 tests/qemuxml2xmloutdata/memory-hotplug-virtio-mem.x86_64-latest.xml diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst index af540391db..2938758ec2 100644 --- a/docs/formatdomain.rst +++ b/docs/formatdomain.rst @@ -7267,6 +7267,18 @@ Example: usage of the memory devices <size unit='KiB'>524288</size> </target> </memory> + <memory model='virtio-mem'> + <source> + <nodemask>1-3</nodemask> + <pagesize unit='KiB'>2048</pagesize> + </source> + <target> + <size unit='KiB'>2097152</size> + <node>0</node> + <block unit='KiB'>2048</block> + <requested unit='KiB'>1048576</requested> + </target> + </memory> </devices> ... @@ -7274,7 +7286,8 @@ Example: usage of the memory devices Provide ``dimm`` to add a virtual DIMM module to the guest. :since:`Since 1.2.14` Provide ``nvdimm`` model that adds a Non-Volatile DIMM module. :since:`Since 3.2.0` Provide ``virtio-pmem`` model to add a paravirtualized - persistent memory device. :since:`Since 7.1.0` + persistent memory device. :since:`Since 7.1.0` Provide ``virtio-mem`` model + to add paravirtualized memory device. :since: `Since 7.1.0` ``access`` An optional attribute ``access`` ( :since:`since 3.2.0` ) that provides @@ -7297,10 +7310,11 @@ Example: usage of the memory devices allowed only for ``model='nvdimm'`` for pSeries guests. :since:`Since 6.2.0` ``source`` - For model ``dimm`` this element is optional and allows to fine tune the - source of the memory used for the given memory device. If the element is not - provided defaults configured via ``numatune`` are used. If ``dimm`` is - provided, then the following optional elements can be provided as well: + For model ``dimm`` and model ``virtio-mem`` this element is optional and + allows to fine tune the source of the memory used for the given memory + device. If the element is not provided defaults configured via ``numatune`` + are used. If the element is provided, then the following optional elements + can be provided: ``pagesize`` This element can be used to override the default host page size used for @@ -7366,6 +7380,17 @@ Example: usage of the memory devices so other backend types should use the ``readonly`` element. :since:`Since 5.0.0` + ``block`` + For ``virtio-mem`` only. + The size of an individual block, granularity of division of memory module. + Must be power of two and at least equal to size of a transparent hugepage + (2MiB on x84_64). The default is hypervisor dependant. + + ``requested`` + For ``virtio-mem`` only. + The total size of blocks exposed to the guest. Must respect ``block`` + granularity. + :anchor:`<a id="elementsIommu"/>` IOMMU devices diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng index a4bddcf132..5bc120073e 100644 --- a/docs/schemas/domaincommon.rng +++ b/docs/schemas/domaincommon.rng @@ -6020,6 +6020,7 @@ <value>dimm</value> <value>nvdimm</value> <value>virtio-pmem</value> + <value>virtio-mem</value> </choice> </attribute> <optional> @@ -6104,6 +6105,16 @@ <ref name="unsignedInt"/> </element> </optional> + <optional> + <element name="block"> + <ref name="scaledInteger"/> + </element> + </optional> + <optional> + <element name="requested"> + <ref name="scaledInteger"/> + </element> + </optional> <optional> <element name="label"> <element name="size"> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index dab4f10326..f8c5a40b24 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -1310,6 +1310,7 @@ VIR_ENUM_IMPL(virDomainMemoryModel, "dimm", "nvdimm", "virtio-pmem", + "virtio-mem", ); VIR_ENUM_IMPL(virDomainShmemModel, @@ -5359,6 +5360,7 @@ virDomainMemoryDefPostParse(virDomainMemoryDefPtr mem, } break; + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: case VIR_DOMAIN_MEMORY_MODEL_DIMM: case VIR_DOMAIN_MEMORY_MODEL_NONE: case VIR_DOMAIN_MEMORY_MODEL_LAST: @@ -15322,6 +15324,7 @@ virDomainMemorySourceDefParseXML(xmlNodePtr node, switch (def->model) { case VIR_DOMAIN_MEMORY_MODEL_DIMM: + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: if (virDomainParseMemory("./pagesize", "./pagesize/@unit", ctxt, &def->pagesize, false, false) < 0) return -1; @@ -15388,7 +15391,8 @@ virDomainMemoryTargetDefParseXML(xmlNodePtr node, &def->size, true, false) < 0) return -1; - if (def->model == VIR_DOMAIN_MEMORY_MODEL_NVDIMM) { + switch (def->model) { + case VIR_DOMAIN_MEMORY_MODEL_NVDIMM: if (virDomainParseMemory("./label/size", "./label/size/@unit", ctxt, &def->labelsize, false, false) < 0) return -1; @@ -15407,6 +15411,23 @@ virDomainMemoryTargetDefParseXML(xmlNodePtr node, if (virXPathBoolean("boolean(./readonly)", ctxt)) def->readonly = true; + break; + + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: + if (virDomainParseMemory("./block", "./block/@unit", ctxt, + &def->blocksize, false, false) < 0) + return -1; + + if (virDomainParseMemory("./requested", "./requested/@unit", ctxt, + &def->requestedsize, false, false) < 0) + return -1; + break; + + case VIR_DOMAIN_MEMORY_MODEL_NONE: + case VIR_DOMAIN_MEMORY_MODEL_DIMM: + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM: + case VIR_DOMAIN_MEMORY_MODEL_LAST: + break; } return 0; @@ -17214,11 +17235,14 @@ virDomainMemoryFindByDefInternal(virDomainDefPtr def, /* target info -> always present */ if (tmp->model != mem->model || tmp->targetNode != mem->targetNode || - tmp->size != mem->size) + tmp->size != mem->size || + tmp->blocksize != mem->blocksize || + tmp->requestedsize != mem->requestedsize) continue; switch (mem->model) { case VIR_DOMAIN_MEMORY_MODEL_DIMM: + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: /* source stuff -> match with device */ if (tmp->pagesize != mem->pagesize) continue; @@ -22784,6 +22808,22 @@ virDomainMemoryDefCheckABIStability(virDomainMemoryDefPtr src, return false; } + if (src->blocksize != dst->blocksize) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("Target memory device block size '%llu' doesn't match " + "source memory device block size '%llu'"), + dst->blocksize, src->blocksize); + return false; + } + + if (src->requestedsize != dst->requestedsize) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("Target memory device requested size '%llu' doesn't match " + "source memory device requested size '%llu'"), + dst->requestedsize, src->requestedsize); + return false; + } + if (src->model == VIR_DOMAIN_MEMORY_MODEL_NVDIMM) { if (src->labelsize != dst->labelsize) { virReportError(VIR_ERR_CONFIG_UNSUPPORTED, @@ -26507,6 +26547,7 @@ virDomainMemorySourceDefFormat(virBufferPtr buf, switch (def->model) { case VIR_DOMAIN_MEMORY_MODEL_DIMM: + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: if (def->sourceNodes) { if (!(bitmap = virBitmapFormat(def->sourceNodes))) return -1; @@ -26563,6 +26604,14 @@ virDomainMemoryTargetDefFormat(virBufferPtr buf, if (def->readonly) virBufferAddLit(&childBuf, "<readonly/>\n"); + if (def->blocksize) { + virBufferAsprintf(&childBuf, "<block unit='KiB'>%llu</block>\n", + def->blocksize); + + virBufferAsprintf(&childBuf, "<requested unit='KiB'>%llu</requested>\n", + def->requestedsize); + } + virXMLFormatElement(buf, "target", NULL, &childBuf); } diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index 95ad052891..5d89ecfe9d 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -2308,6 +2308,7 @@ typedef enum { VIR_DOMAIN_MEMORY_MODEL_DIMM, /* dimm hotpluggable memory device */ VIR_DOMAIN_MEMORY_MODEL_NVDIMM, /* nvdimm memory device */ VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM, /* virtio-pmem memory device */ + VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM, /* virtio-mem memory device */ VIR_DOMAIN_MEMORY_MODEL_LAST } virDomainMemoryModel; @@ -2328,6 +2329,8 @@ struct _virDomainMemoryDef { int targetNode; unsigned long long size; /* kibibytes */ unsigned long long labelsize; /* kibibytes; valid only for NVDIMM */ + unsigned long long blocksize; /* kibibytes; valid only for VIRTIO_MEM */ + unsigned long long requestedsize; /* kibibytes; valid only for VIRTIO_MEM */ bool readonly; /* valid only for NVDIMM */ /* required for QEMU NVDIMM ppc64 support */ diff --git a/src/conf/domain_validate.c b/src/conf/domain_validate.c index 649fc335ac..b5a0c09468 100644 --- a/src/conf/domain_validate.c +++ b/src/conf/domain_validate.c @@ -25,6 +25,7 @@ #include "virconftypes.h" #include "virlog.h" #include "virutil.h" +#include "virhostmem.h" #define VIR_FROM_THIS VIR_FROM_DOMAIN @@ -1389,6 +1390,8 @@ static int virDomainMemoryDefValidate(const virDomainMemoryDef *mem, const virDomainDef *def) { + unsigned long long thpSize; + switch (mem->model) { case VIR_DOMAIN_MEMORY_MODEL_NVDIMM: if (!mem->nvdimmPath) { @@ -1442,6 +1445,42 @@ virDomainMemoryDefValidate(const virDomainMemoryDef *mem, _("virtio-pmem does not support NUMA nodes")); return -1; } + break; + + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: + if (mem->requestedsize > mem->size) { + virReportError(VIR_ERR_XML_DETAIL, "%s", + _("requested size must be smaller than @size")); + return -1; + } + + if (!VIR_IS_POW2(mem->blocksize)) { + virReportError(VIR_ERR_XML_DETAIL, "%s", + _("block size must be a power of two")); + return -1; + } + + if (virHostMemGetTHPSize(&thpSize) < 0) { + /* We failed to get THP size, fall back to a sane default. On + * almost every architecture the size will be 2MiB, except for some + * funky arches like sparc and m68k. Use 2MiB and refine later if + * somebody complains. */ + thpSize = 2048; + } + + if (mem->blocksize < thpSize) { + virReportError(VIR_ERR_XML_DETAIL, + _("block size too small, must be at least %lluKiB"), + thpSize); + return -1; + } + + if (mem->requestedsize % mem->blocksize != 0) { + virReportError(VIR_ERR_XML_DETAIL, "%s", + _("requested size must be an integer multiple of block size")); + return -1; + } + break; case VIR_DOMAIN_MEMORY_MODEL_DIMM: break; diff --git a/src/qemu/qemu_alias.c b/src/qemu/qemu_alias.c index b3492d6e85..2a4e2393c8 100644 --- a/src/qemu/qemu_alias.c +++ b/src/qemu/qemu_alias.c @@ -522,6 +522,7 @@ qemuAssignDeviceMemoryAlias(virDomainDefPtr def, case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM: prefix = "virtiopmem"; break; + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: case VIR_DOMAIN_MEMORY_MODEL_NONE: case VIR_DOMAIN_MEMORY_MODEL_LAST: default: diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 1ec302d4ac..0a4a8f2646 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -3303,6 +3303,7 @@ qemuBuildMemoryDeviceStr(const virDomainDef *def, device = "virtio-pmem-pci"; break; + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: case VIR_DOMAIN_MEMORY_MODEL_NONE: case VIR_DOMAIN_MEMORY_MODEL_LAST: default: diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index 0c078a9388..233adc996f 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -8682,6 +8682,16 @@ qemuDomainDefValidateMemoryHotplugDevice(const virDomainMemoryDef *mem, needsNuma = false; break; + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: + if (mem->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI && + mem->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("only 'pci' addresses are supported for the %s device"), + virDomainMemoryModelTypeToString(mem->model)); + return -1; + } + break; + case VIR_DOMAIN_MEMORY_MODEL_NONE: case VIR_DOMAIN_MEMORY_MODEL_LAST: return -1; diff --git a/src/qemu/qemu_domain_address.c b/src/qemu/qemu_domain_address.c index d40edadb4d..396acc7a09 100644 --- a/src/qemu/qemu_domain_address.c +++ b/src/qemu/qemu_domain_address.c @@ -380,9 +380,18 @@ qemuDomainPrimeVirtioDeviceAddresses(virDomainDefPtr def, } for (i = 0; i < def->nmems; i++) { - if (def->mems[i]->model == VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM && - def->mems[i]->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE) - def->mems[i]->info.type = type; + switch (def->mems[i]->model) { + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM: + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: + if (def->mems[i]->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE) + def->mems[i]->info.type = type; + break; + case VIR_DOMAIN_MEMORY_MODEL_NONE: + case VIR_DOMAIN_MEMORY_MODEL_DIMM: + case VIR_DOMAIN_MEMORY_MODEL_NVDIMM: + case VIR_DOMAIN_MEMORY_MODEL_LAST: + break; + } } if (type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW) { @@ -1014,6 +1023,7 @@ qemuDomainDeviceCalculatePCIConnectFlags(virDomainDeviceDefPtr dev, case VIR_DOMAIN_DEVICE_MEMORY: switch (dev->data.memory->model) { case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM: + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: return virtioFlags; case VIR_DOMAIN_MEMORY_MODEL_NONE: @@ -2441,12 +2451,19 @@ qemuDomainAssignDevicePCISlots(virDomainDefPtr def, for (i = 0; i < def->nmems; i++) { virDomainMemoryDefPtr mem = def->mems[i]; - if (mem->model != VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM || - !virDeviceInfoPCIAddressIsWanted(&mem->info)) - continue; - - if (qemuDomainPCIAddressReserveNextAddr(addrs, &mem->info) < 0) - return -1; + switch (mem->model) { + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM: + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: + if (virDeviceInfoPCIAddressIsWanted(&mem->info) && + qemuDomainPCIAddressReserveNextAddr(addrs, &mem->info) < 0) + return -1; + break; + case VIR_DOMAIN_MEMORY_MODEL_NONE: + case VIR_DOMAIN_MEMORY_MODEL_DIMM: + case VIR_DOMAIN_MEMORY_MODEL_NVDIMM: + case VIR_DOMAIN_MEMORY_MODEL_LAST: + break; + } } return 0; @@ -3113,6 +3130,7 @@ qemuDomainAssignMemoryDeviceSlot(virQEMUDriverPtr driver, break; case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM: + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: return qemuDomainEnsurePCIAddress(vm, &dev, driver); break; @@ -3149,6 +3167,7 @@ qemuDomainAssignMemorySlots(virDomainDefPtr def) break; case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM: + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: /* handled in qemuDomainAssignPCIAddresses() */ break; case VIR_DOMAIN_MEMORY_MODEL_NONE: diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c index a060bd98ba..0f7c89b972 100644 --- a/src/qemu/qemu_validate.c +++ b/src/qemu/qemu_validate.c @@ -4632,6 +4632,14 @@ qemuValidateDomainDeviceDefMemory(virDomainMemoryDefPtr mem, } break; + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: + if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI)) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", + _("virtio-mem isn't supported by this QEMU binary")); + return -1; + } + break; + case VIR_DOMAIN_MEMORY_MODEL_NONE: case VIR_DOMAIN_MEMORY_MODEL_LAST: break; diff --git a/src/security/security_apparmor.c b/src/security/security_apparmor.c index 1f309c0c9f..60ffc814d8 100644 --- a/src/security/security_apparmor.c +++ b/src/security/security_apparmor.c @@ -693,6 +693,7 @@ AppArmorSetMemoryLabel(virSecurityManagerPtr mgr, return reload_profile(mgr, def, mem->nvdimmPath, true); case VIR_DOMAIN_MEMORY_MODEL_NONE: case VIR_DOMAIN_MEMORY_MODEL_DIMM: + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: case VIR_DOMAIN_MEMORY_MODEL_LAST: break; } diff --git a/src/security/security_dac.c b/src/security/security_dac.c index 71d58758c4..118d9961dc 100644 --- a/src/security/security_dac.c +++ b/src/security/security_dac.c @@ -1894,6 +1894,7 @@ virSecurityDACRestoreMemoryLabel(virSecurityManagerPtr mgr, break; case VIR_DOMAIN_MEMORY_MODEL_DIMM: + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: case VIR_DOMAIN_MEMORY_MODEL_LAST: case VIR_DOMAIN_MEMORY_MODEL_NONE: ret = 0; @@ -2077,6 +2078,7 @@ virSecurityDACSetMemoryLabel(virSecurityManagerPtr mgr, break; case VIR_DOMAIN_MEMORY_MODEL_DIMM: + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: case VIR_DOMAIN_MEMORY_MODEL_LAST: case VIR_DOMAIN_MEMORY_MODEL_NONE: ret = 0; diff --git a/src/security/security_selinux.c b/src/security/security_selinux.c index 3563dbfb86..b6744efcd3 100644 --- a/src/security/security_selinux.c +++ b/src/security/security_selinux.c @@ -1584,6 +1584,7 @@ virSecuritySELinuxSetMemoryLabel(virSecurityManagerPtr mgr, case VIR_DOMAIN_MEMORY_MODEL_NONE: case VIR_DOMAIN_MEMORY_MODEL_DIMM: + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: case VIR_DOMAIN_MEMORY_MODEL_LAST: break; } @@ -1611,6 +1612,7 @@ virSecuritySELinuxRestoreMemoryLabel(virSecurityManagerPtr mgr, break; case VIR_DOMAIN_MEMORY_MODEL_DIMM: + case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: case VIR_DOMAIN_MEMORY_MODEL_NONE: case VIR_DOMAIN_MEMORY_MODEL_LAST: ret = 0; diff --git a/tests/domaincapsmock.c b/tests/domaincapsmock.c index d81a898dc0..34a2f9ad81 100644 --- a/tests/domaincapsmock.c +++ b/tests/domaincapsmock.c @@ -17,6 +17,7 @@ #include <config.h> #include "virhostcpu.h" +#include "virhostmem.h" #ifdef WITH_LIBXL # include "libxl/libxl_capabilities.h" #endif @@ -40,3 +41,11 @@ virHostCPUGetMicrocodeVersion(virArch hostArch G_GNUC_UNUSED) { return 0; } + +int +virHostMemGetTHPSize(unsigned long long *size) +{ + /* Pretend Transparent Huge Page size is 2MiB. */ + *size = 2048; + return 0; +} diff --git a/tests/qemuxml2argvdata/memory-hotplug-virtio-mem.xml b/tests/qemuxml2argvdata/memory-hotplug-virtio-mem.xml new file mode 100644 index 0000000000..7c9db0c808 --- /dev/null +++ b/tests/qemuxml2argvdata/memory-hotplug-virtio-mem.xml @@ -0,0 +1,66 @@ +<domain type='kvm'> + <name>QEMUGuest1</name> + <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid> + <maxMemory slots='16' unit='KiB'>1099511627776</maxMemory> + <memory unit='KiB'>8388608</memory> + <currentMemory unit='KiB'>8388608</currentMemory> + <vcpu placement='static' cpuset='0-1'>2</vcpu> + <os> + <type arch='x86_64' machine='pc'>hvm</type> + <boot dev='hd'/> + </os> + <cpu mode='custom' match='exact' check='none'> + <model fallback='forbid'>qemu64</model> + <topology sockets='2' dies='1' cores='1' threads='1'/> + <numa> + <cell id='0' cpus='0-1' memory='2095104' unit='KiB'/> + </numa> + </cpu> + <clock offset='utc'/> + <on_poweroff>destroy</on_poweroff> + <on_reboot>restart</on_reboot> + <on_crash>destroy</on_crash> + <devices> + <emulator>/usr/bin/qemu-system-i386</emulator> + <disk type='block' device='disk'> + <driver name='qemu' type='raw'/> + <source dev='/dev/HostVG/QEMUGuest1'/> + <target dev='hda' bus='ide'/> + <address type='drive' controller='0' bus='0' target='0' unit='0'/> + </disk> + <controller type='ide' index='0'> + <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> + </controller> + <controller type='usb' index='0' model='piix3-uhci'> + <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> + </controller> + <controller type='pci' index='0' model='pci-root'/> + <input type='mouse' bus='ps2'/> + <input type='keyboard' bus='ps2'/> + <memballoon model='virtio'> + <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> + </memballoon> + <memory model='virtio-mem'> + <target> + <size unit='KiB'>1048576</size> + <node>0</node> + <block unit='KiB'>2048</block> + <requested unit='KiB'>524288</requested> + </target> + <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> + </memory> + <memory model='virtio-mem'> + <source> + <nodemask>1-3</nodemask> + <pagesize unit='KiB'>2048</pagesize> + </source> + <target> + <size unit='KiB'>2097152</size> + <node>0</node> + <block unit='KiB'>2048</block> + <requested unit='KiB'>1048576</requested> + </target> + <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> + </memory> + </devices> +</domain> diff --git a/tests/qemuxml2xmloutdata/memory-hotplug-virtio-mem.x86_64-latest.xml b/tests/qemuxml2xmloutdata/memory-hotplug-virtio-mem.x86_64-latest.xml new file mode 120000 index 0000000000..a9d298129c --- /dev/null +++ b/tests/qemuxml2xmloutdata/memory-hotplug-virtio-mem.x86_64-latest.xml @@ -0,0 +1 @@ +../qemuxml2argvdata/memory-hotplug-virtio-mem.xml \ No newline at end of file diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c index 9553a8a4f8..ba23fdda00 100644 --- a/tests/qemuxml2xmltest.c +++ b/tests/qemuxml2xmltest.c @@ -1262,6 +1262,7 @@ mymain(void) QEMU_CAPS_DEVICE_NVDIMM, QEMU_CAPS_LAST); DO_TEST_CAPS_LATEST("memory-hotplug-virtio-pmem"); + DO_TEST_CAPS_LATEST("memory-hotplug-virtio-mem"); DO_TEST("net-udp", NONE); -- 2.26.2

On 22.01.21 19:16, Daniel Henrique Barboza wrote: So, in QEMU we use the following logic right now: get_block_size() { block_size = backend_pagesize(); if (block_size == NATIVE_PAGE_SIZE) return MAX(block_size, native_thp_size()); return MAX(block_size, 1 * MiB); } detect_thp_size() { thp_size = read_from_file(); if (!thp_size || thp_size > 16 * MiB) { if (s390x) return 1 * MiB; return 2 * MiB; } return thp_size; } Especially, we also cap big block sizes (esp. arm64 with currently 512 MiB THP), as we prefer flexibility at this point. So yes, on a x86-4 *host* we'll usually end up 2 MiB in QEMU. On arm64 it can be quite different. -- Thanks, David / dhildenb

Nothing special is happening here. All important changes were done when for 'virtio-pmem' (adjusting the code to put virtio memory on PCI bus, generating alias using qemuDomainDeviceAliasIndex(). The only bit that might look suspicious is no prealloc for virtio-mem. But if you think about it, the whole purpose of this device is to change amount of memory exposed to guest on the fly. There is no point in locking the whole backend in memory. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/qemu/qemu_alias.c | 9 +++- src/qemu/qemu_command.c | 12 ++++- ...mory-hotplug-virtio-mem.x86_64-latest.args | 49 +++++++++++++++++++ tests/qemuxml2argvtest.c | 1 + 4 files changed, 68 insertions(+), 3 deletions(-) create mode 100644 tests/qemuxml2argvdata/memory-hotplug-virtio-mem.x86_64-latest.args diff --git a/src/qemu/qemu_alias.c b/src/qemu/qemu_alias.c index 2a4e2393c8..e539bf9c8e 100644 --- a/src/qemu/qemu_alias.c +++ b/src/qemu/qemu_alias.c @@ -475,8 +475,11 @@ qemuDeviceMemoryGetAliasID(virDomainDefPtr def, size_t i; int maxidx = 0; - /* virtio-pmem goes onto PCI bus and thus DIMM address is not valid */ - if (!oldAlias && mem->model != VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM) + /* virtio-pmem and virtio-mem go onto PCI bus and thus DIMM address is not + * valid */ + if (!oldAlias && + mem->model != VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM && + mem->model != VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM) return mem->info.addr.dimm.slot; for (i = 0; i < def->nmems; i++) { @@ -523,6 +526,8 @@ qemuAssignDeviceMemoryAlias(virDomainDefPtr def, prefix = "virtiopmem"; break; case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: + prefix = "virtiomem"; + break; case VIR_DOMAIN_MEMORY_MODEL_NONE: case VIR_DOMAIN_MEMORY_MODEL_LAST: default: diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 0a4a8f2646..4e50dbc0fd 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -3094,7 +3094,9 @@ qemuBuildMemoryBackendProps(virJSONValuePtr *backendProps, } else if (useHugepage) { if (qemuGetDomainHupageMemPath(priv->driver, def, pagesize, &memPath) < 0) return -1; - prealloc = true; + /* For virtio-mem backed by hugepages we don't need prealloc. */ + if (mem->model != VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM) + prealloc = true; } else { /* We can have both pagesize and mem source. If that's the case, * prefer hugepages as those are more specific. */ @@ -3304,6 +3306,9 @@ qemuBuildMemoryDeviceStr(const virDomainDef *def, break; case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM: + device = "virtio-mem-pci"; + break; + case VIR_DOMAIN_MEMORY_MODEL_NONE: case VIR_DOMAIN_MEMORY_MODEL_LAST: default: @@ -3320,6 +3325,11 @@ qemuBuildMemoryDeviceStr(const virDomainDef *def, if (mem->labelsize) virBufferAsprintf(&buf, "label-size=%llu,", mem->labelsize * 1024); + if (mem->blocksize) { + virBufferAsprintf(&buf, "block-size=%llu,", mem->blocksize * 1024); + virBufferAsprintf(&buf, "requested-size=%llu,", mem->requestedsize * 1024); + } + if (mem->uuid) { char uuidstr[VIR_UUID_STRING_BUFLEN]; diff --git a/tests/qemuxml2argvdata/memory-hotplug-virtio-mem.x86_64-latest.args b/tests/qemuxml2argvdata/memory-hotplug-virtio-mem.x86_64-latest.args new file mode 100644 index 0000000000..403e05865f --- /dev/null +++ b/tests/qemuxml2argvdata/memory-hotplug-virtio-mem.x86_64-latest.args @@ -0,0 +1,49 @@ +LC_ALL=C \ +PATH=/bin \ +HOME=/tmp/lib/domain--1-QEMUGuest1 \ +USER=test \ +LOGNAME=test \ +XDG_DATA_HOME=/tmp/lib/domain--1-QEMUGuest1/.local/share \ +XDG_CACHE_HOME=/tmp/lib/domain--1-QEMUGuest1/.cache \ +XDG_CONFIG_HOME=/tmp/lib/domain--1-QEMUGuest1/.config \ +QEMU_AUDIO_DRV=none \ +/usr/bin/qemu-system-i386 \ +-name guest=QEMUGuest1,debug-threads=on \ +-S \ +-object secret,id=masterKey0,format=raw,\ +file=/tmp/lib/domain--1-QEMUGuest1/master-key.aes \ +-machine pc,accel=kvm,usb=off,dump-guest-core=off \ +-cpu qemu64 \ +-m size=2095104k,slots=16,maxmem=1099511627776k \ +-overcommit mem-lock=off \ +-smp 2,sockets=2,dies=1,cores=1,threads=1 \ +-object memory-backend-ram,id=ram-node0,size=2145386496 \ +-numa node,nodeid=0,cpus=0-1,memdev=ram-node0 \ +-object memory-backend-ram,id=memvirtiomem0,size=1073741824 \ +-device virtio-mem-pci,node=0,block-size=2097152,requested-size=536870912,\ +memdev=memvirtiomem0,id=virtiomem0,bus=pci.0,addr=0x2 \ +-object memory-backend-file,id=memvirtiomem1,\ +mem-path=/dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1,size=2147483648,\ +host-nodes=1-3,policy=bind \ +-device virtio-mem-pci,node=0,block-size=2097152,requested-size=1073741824,\ +memdev=memvirtiomem1,id=virtiomem1,bus=pci.0,addr=0x4 \ +-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \ +-display none \ +-no-user-config \ +-nodefaults \ +-chardev socket,id=charmonitor,fd=1729,server,nowait \ +-mon chardev=charmonitor,id=monitor,mode=control \ +-rtc base=utc \ +-no-shutdown \ +-no-acpi \ +-boot strict=on \ +-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \ +-blockdev '{"driver":"host_device","filename":"/dev/HostVG/QEMUGuest1",\ +"node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}' \ +-blockdev '{"node-name":"libvirt-1-format","read-only":false,"driver":"raw",\ +"file":"libvirt-1-storage"}' \ +-device ide-hd,bus=ide.0,unit=0,drive=libvirt-1-format,id=ide0-0-0,bootindex=1 \ +-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 \ +-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,\ +resourcecontrol=deny \ +-msg timestamp=on diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c index cf77224fc3..0e261fb321 100644 --- a/tests/qemuxml2argvtest.c +++ b/tests/qemuxml2argvtest.c @@ -3054,6 +3054,7 @@ mymain(void) QEMU_CAPS_DEVICE_NVDIMM, QEMU_CAPS_LAST); DO_TEST_CAPS_LATEST("memory-hotplug-virtio-pmem"); + DO_TEST_CAPS_LATEST("memory-hotplug-virtio-mem"); DO_TEST("machine-aeskeywrap-on-caps", QEMU_CAPS_AES_KEY_WRAP, -- 2.26.2

On 1/22/21 9:50 AM, Michal Privoznik wrote: Extra " ' " after want. Reviewed-by: Daniel Henrique Barboza <danielhb413(a)gmail.com&gt;

As advertised in previous commit, this event is delivered to us when virtio-mem module changes the allocation inside the guest. It comes with one attribute - size - which holds the new size of the virtio-mem (well, allocated size), in bytes. Mind you, this is not necessarily the same number as 'requested size'. It almost certainly will be when sizing the memory up, but it might not be when sizing the memory down - the guest kernel might be unable to free some blocks. This actual size is reported in the domain XML as an output element only. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- docs/formatdomain.rst | 7 ++++++ docs/schemas/domaincommon.rng | 5 +++++ src/conf/domain_conf.c | 24 ++++++++++++++++++-- src/conf/domain_conf.h | 7 ++++++ src/libvirt_private.syms | 1 + src/qemu/qemu_domain.c | 3 +++ src/qemu/qemu_domain.h | 1 + src/qemu/qemu_driver.c | 33 ++++++++++++++++++++++++++++ src/qemu/qemu_monitor.c | 24 ++++++++++++++++++++ src/qemu/qemu_monitor.h | 20 +++++++++++++++++ src/qemu/qemu_monitor_json.c | 24 ++++++++++++++++++++ src/qemu/qemu_process.c | 41 +++++++++++++++++++++++++++++++++++ 12 files changed, 188 insertions(+), 2 deletions(-) diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst index 2938758ec2..3088da1243 100644 --- a/docs/formatdomain.rst +++ b/docs/formatdomain.rst @@ -7277,6 +7277,7 @@ Example: usage of the memory devices <node>0</node> <block unit='KiB'>2048</block> <requested unit='KiB'>1048576</requested> + <actual unit='KiB'>524288</requested> </target> </memory> </devices> @@ -7391,6 +7392,12 @@ Example: usage of the memory devices The total size of blocks exposed to the guest. Must respect ``block`` granularity. + ``actual`` + Active XML for ``virtio-mem`` model may contain ``actual`` element that + reflects the actual size of the corresponding virtio memory device. The + element is formatted into live XML and never parsed, i.e. it is + output-only element. + :anchor:`<a id="elementsIommu"/>` IOMMU devices diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng index 5bc120073e..6d5c983bc6 100644 --- a/docs/schemas/domaincommon.rng +++ b/docs/schemas/domaincommon.rng @@ -6115,6 +6115,11 @@ <ref name="scaledInteger"/> </element> </optional> + <optional> + <element name="actual"> + <ref name="scaledInteger"/> + </element> + </optional> <optional> <element name="label"> <element name="size"> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index b6fe5e4436..74c897b53e 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -17320,6 +17320,21 @@ virDomainMemoryFindByDeviceInfo(virDomainDefPtr def, } +ssize_t +virDomainMemoryFindByDeviceAlias(virDomainDefPtr def, + const char *alias) +{ + size_t i; + + for (i = 0; i < def->nmems; i++) { + if (STREQ_NULLABLE(def->mems[i]->info.alias, alias)) + return i; + } + + return -1; +} + + /** * virDomainMemoryInsert: * @@ -26611,7 +26626,8 @@ virDomainMemorySourceDefFormat(virBufferPtr buf, static void virDomainMemoryTargetDefFormat(virBufferPtr buf, - virDomainMemoryDefPtr def) + virDomainMemoryDefPtr def, + unsigned int flags) { g_auto(virBuffer) childBuf = VIR_BUFFER_INIT_CHILD(buf); @@ -26633,6 +26649,10 @@ virDomainMemoryTargetDefFormat(virBufferPtr buf, virBufferAsprintf(&childBuf, "<requested unit='KiB'>%llu</requested>\n", def->requestedsize); + if (!(flags & VIR_DOMAIN_DEF_FORMAT_INACTIVE)) { + virBufferAsprintf(&childBuf, "<actual unit='KiB'>%llu</actual>\n", + def->actualsize); + } } virXMLFormatElement(buf, "target", NULL, &childBuf); @@ -26665,7 +26685,7 @@ virDomainMemoryDefFormat(virBufferPtr buf, if (virDomainMemorySourceDefFormat(buf, def) < 0) return -1; - virDomainMemoryTargetDefFormat(buf, def); + virDomainMemoryTargetDefFormat(buf, def, flags); virDomainDeviceInfoFormat(buf, &def->info, flags); diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index ef52328a6f..5f4a455963 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -2331,6 +2331,9 @@ struct _virDomainMemoryDef { unsigned long long labelsize; /* kibibytes; valid only for NVDIMM */ unsigned long long blocksize; /* kibibytes; valid only for VIRTIO_MEM */ unsigned long long requestedsize; /* kibibytes; valid only for VIRTIO_MEM */ + unsigned long long actualsize; /* kibibytes, valid for VIRTIO_MEM and + active domain only, only to report never + parse */ bool readonly; /* valid only for NVDIMM */ /* required for QEMU NVDIMM ppc64 support */ @@ -3613,6 +3616,10 @@ ssize_t virDomainMemoryFindByDeviceInfo(virDomainDefPtr dev, virDomainDeviceInfoPtr info) ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT; +ssize_t virDomainMemoryFindByDeviceAlias(virDomainDefPtr def, + const char *alias) + ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT; + int virDomainShmemDefInsert(virDomainDefPtr def, virDomainShmemDefPtr shmem) ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT; bool virDomainShmemDefEquals(virDomainShmemDefPtr src, virDomainShmemDefPtr dst) diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 2e7f92bcfe..f3556cee82 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -494,6 +494,7 @@ virDomainMemballoonModelTypeFromString; virDomainMemballoonModelTypeToString; virDomainMemoryDefFree; virDomainMemoryFindByDef; +virDomainMemoryFindByDeviceAlias; virDomainMemoryFindByDeviceInfo; virDomainMemoryFindInactiveByDef; virDomainMemoryInsert; diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index 233adc996f..783756b191 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -10771,6 +10771,9 @@ qemuProcessEventFree(struct qemuProcessEvent *event) case QEMU_PROCESS_EVENT_JOB_STATUS_CHANGE: virObjectUnref(event->data); break; + case QEMU_PROCESS_EVENT_MEMORY_DEVICE_SIZE_CHANGE: + qemuMonitorMemoryDeviceSizeChangeFree(event->data); + break; case QEMU_PROCESS_EVENT_PR_DISCONNECT: case QEMU_PROCESS_EVENT_LAST: break; diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h index 154339ef8f..79ccccebcb 100644 --- a/src/qemu/qemu_domain.h +++ b/src/qemu/qemu_domain.h @@ -441,6 +441,7 @@ typedef enum { QEMU_PROCESS_EVENT_PR_DISCONNECT, QEMU_PROCESS_EVENT_RDMA_GID_STATUS_CHANGED, QEMU_PROCESS_EVENT_GUEST_CRASHLOADED, + QEMU_PROCESS_EVENT_MEMORY_DEVICE_SIZE_CHANGE, QEMU_PROCESS_EVENT_LAST } qemuProcessEventType; diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index fadf0240fc..d64eb4d399 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -4273,6 +4273,36 @@ processGuestCrashloadedEvent(virQEMUDriverPtr driver, } +static void +processMemoryDeviceSizeChange(virQEMUDriverPtr driver, + virDomainObjPtr vm, + qemuMonitorMemoryDeviceSizeChangePtr info) +{ + virDomainMemoryDefPtr mem = NULL; + ssize_t idx; + + if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0) + return; + + if (!virDomainObjIsActive(vm)) { + VIR_DEBUG("Domain is not running"); + goto endjob; + } + + idx = virDomainMemoryFindByDeviceAlias(vm->def, info->devAlias); + if (idx < 0) { + VIR_DEBUG("Memory device '%s' not found", info->devAlias); + goto endjob; + } + + mem = vm->def->mems[idx]; + mem->actualsize = VIR_DIV_UP(info->size, 1024); + + endjob: + qemuDomainObjEndJob(driver, vm); +} + + static void qemuProcessEventHandler(void *data, void *opaque) { struct qemuProcessEvent *processEvent = data; @@ -4322,6 +4352,9 @@ static void qemuProcessEventHandler(void *data, void *opaque) case QEMU_PROCESS_EVENT_GUEST_CRASHLOADED: processGuestCrashloadedEvent(driver, vm); break; + case QEMU_PROCESS_EVENT_MEMORY_DEVICE_SIZE_CHANGE: + processMemoryDeviceSizeChange(driver, vm, processEvent->data); + break; case QEMU_PROCESS_EVENT_LAST: break; } diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c index 6b3c1c2f5e..59f0265804 100644 --- a/src/qemu/qemu_monitor.c +++ b/src/qemu/qemu_monitor.c @@ -1437,6 +1437,20 @@ qemuMonitorEmitSpiceMigrated(qemuMonitorPtr mon) } +int +qemuMonitorEmitMemoryDeviceSizeChange(qemuMonitorPtr mon, + const char *devAlias, + unsigned long long size) +{ + int ret = -1; + VIR_DEBUG("mon=%p, devAlias='%s', size=%llu", mon, devAlias, size); + + QEMU_MONITOR_CALLBACK(mon, ret, domainMemoryDeviceSizeChange, mon->vm, devAlias, size); + + return ret; +} + + int qemuMonitorEmitMemoryFailure(qemuMonitorPtr mon, qemuMonitorEventMemoryFailurePtr mfp) @@ -4400,6 +4414,16 @@ qemuMonitorEventRdmaGidStatusFree(qemuMonitorRdmaGidStatusPtr info) } +void +qemuMonitorMemoryDeviceSizeChangeFree(qemuMonitorMemoryDeviceSizeChangePtr info) +{ + if (!info) + return; + + VIR_FREE(info->devAlias); +} + + int qemuMonitorSetWatchdogAction(qemuMonitorPtr mon, const char *action) diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h index 443ddddf9b..00428c14d2 100644 --- a/src/qemu/qemu_monitor.h +++ b/src/qemu/qemu_monitor.h @@ -108,6 +108,14 @@ struct _qemuMonitorRdmaGidStatus { }; +typedef struct _qemuMonitorMemoryDeviceSizeChange qemuMonitorMemoryDeviceSizeChange; +typedef qemuMonitorMemoryDeviceSizeChange *qemuMonitorMemoryDeviceSizeChangePtr; +struct _qemuMonitorMemoryDeviceSizeChange { + char *devAlias; + unsigned long long size; +}; + + typedef enum { QEMU_MONITOR_JOB_TYPE_UNKNOWN, /* internal value, not exposed by qemu */ QEMU_MONITOR_JOB_TYPE_COMMIT, @@ -153,6 +161,7 @@ struct _qemuMonitorJobInfo { char *qemuMonitorGuestPanicEventInfoFormatMsg(qemuMonitorEventPanicInfoPtr info); void qemuMonitorEventPanicInfoFree(qemuMonitorEventPanicInfoPtr info); void qemuMonitorEventRdmaGidStatusFree(qemuMonitorRdmaGidStatusPtr info); +void qemuMonitorMemoryDeviceSizeChangeFree(qemuMonitorMemoryDeviceSizeChangePtr info); typedef void (*qemuMonitorDestroyCallback)(qemuMonitorPtr mon, virDomainObjPtr vm, @@ -374,6 +383,12 @@ typedef int (*qemuMonitorDomainMemoryFailureCallback)(qemuMonitorPtr mon, qemuMonitorEventMemoryFailurePtr mfp, void *opaque); +typedef int (*qemuMonitorDomainMemoryDeviceSizeChange)(qemuMonitorPtr mon, + virDomainObjPtr vm, + const char *alias, + unsigned long long size, + void *opaque); + typedef struct _qemuMonitorCallbacks qemuMonitorCallbacks; typedef qemuMonitorCallbacks *qemuMonitorCallbacksPtr; struct _qemuMonitorCallbacks { @@ -411,6 +426,7 @@ struct _qemuMonitorCallbacks { qemuMonitorDomainRdmaGidStatusChangedCallback domainRdmaGidStatusChanged; qemuMonitorDomainGuestCrashloadedCallback domainGuestCrashloaded; qemuMonitorDomainMemoryFailureCallback domainMemoryFailure; + qemuMonitorDomainMemoryDeviceSizeChange domainMemoryDeviceSizeChange; }; qemuMonitorPtr qemuMonitorOpen(virDomainObjPtr vm, @@ -507,6 +523,10 @@ int qemuMonitorEmitSerialChange(qemuMonitorPtr mon, bool connected); int qemuMonitorEmitSpiceMigrated(qemuMonitorPtr mon); +int qemuMonitorEmitMemoryDeviceSizeChange(qemuMonitorPtr mon, + const char *devAlias, + unsigned long long size); + int qemuMonitorEmitMemoryFailure(qemuMonitorPtr mon, qemuMonitorEventMemoryFailurePtr mfp); diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c index 0ab4264522..b1dc527e8b 100644 --- a/src/qemu/qemu_monitor_json.c +++ b/src/qemu/qemu_monitor_json.c @@ -113,6 +113,7 @@ static void qemuMonitorJSONHandleDumpCompleted(qemuMonitorPtr mon, virJSONValueP static void qemuMonitorJSONHandlePRManagerStatusChanged(qemuMonitorPtr mon, virJSONValuePtr data); static void qemuMonitorJSONHandleRdmaGidStatusChanged(qemuMonitorPtr mon, virJSONValuePtr data); static void qemuMonitorJSONHandleMemoryFailure(qemuMonitorPtr mon, virJSONValuePtr data); +static void qemuMonitorJSONHandleMemoryDeviceSizeChange(qemuMonitorPtr mon, virJSONValuePtr data); typedef struct { const char *type; @@ -133,6 +134,7 @@ static qemuEventHandler eventHandlers[] = { { "GUEST_CRASHLOADED", qemuMonitorJSONHandleGuestCrashloaded, }, { "GUEST_PANICKED", qemuMonitorJSONHandleGuestPanic, }, { "JOB_STATUS_CHANGE", qemuMonitorJSONHandleJobStatusChange, }, + { "MEMORY_DEVICE_SIZE_CHANGE", qemuMonitorJSONHandleMemoryDeviceSizeChange, }, { "MEMORY_FAILURE", qemuMonitorJSONHandleMemoryFailure, }, { "MIGRATION", qemuMonitorJSONHandleMigrationStatus, }, { "MIGRATION_PASS", qemuMonitorJSONHandleMigrationPass, }, @@ -1333,6 +1335,28 @@ qemuMonitorJSONHandleSpiceMigrated(qemuMonitorPtr mon, } +static void +qemuMonitorJSONHandleMemoryDeviceSizeChange(qemuMonitorPtr mon, + virJSONValuePtr data) +{ + const char *name; + unsigned long long size; + + if (!(name = virJSONValueObjectGetString(data, "id"))) { + VIR_WARN("missing device alias in MEMORY_DEVICE_SIZE_CHANGE event"); + return; + } + + if (virJSONValueObjectGetNumberUlong(data, "size", &size) < 0) { + VIR_WARN("missing new size for '%s' in MEMORY_DEVICE_SIZE_CHANGE event", name); + return; + } + + + qemuMonitorEmitMemoryDeviceSizeChange(mon, name, size); +} + + static void qemuMonitorJSONHandleMemoryFailure(qemuMonitorPtr mon, virJSONValuePtr data) diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index f87a3c0f60..37cc6a28e5 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -1937,6 +1937,46 @@ qemuProcessHandleMemoryFailure(qemuMonitorPtr mon G_GNUC_UNUSED, } +static int +qemuProcessHandleMemoryDeviceSizeChange(qemuMonitorPtr mon G_GNUC_UNUSED, + virDomainObjPtr vm, + const char *devAlias, + unsigned long long size, + void *opaque) +{ + virQEMUDriverPtr driver = opaque; + struct qemuProcessEvent *processEvent = NULL; + qemuMonitorMemoryDeviceSizeChangePtr info = NULL; + int ret = -1; + + virObjectLock(vm); + + VIR_DEBUG("Memory device '%s' changed size to '%llu' in domain '%s'", + devAlias, size, vm->def->name); + + info = g_new0(qemuMonitorMemoryDeviceSizeChange, 1); + info->devAlias = g_strdup(devAlias); + info->size = size; + + processEvent = g_new0(struct qemuProcessEvent, 1); + processEvent->eventType = QEMU_PROCESS_EVENT_MEMORY_DEVICE_SIZE_CHANGE; + processEvent->vm = virObjectRef(vm); + processEvent->data = g_steal_pointer(&info); + + if (virThreadPoolSendJob(driver->workerPool, 0, processEvent) < 0) { + qemuProcessEventFree(processEvent); + virObjectUnref(vm); + goto cleanup; + } + + ret = 0; + cleanup: + qemuMonitorMemoryDeviceSizeChangeFree(info); + virObjectUnlock(vm); + return ret; +} + + static qemuMonitorCallbacks monitorCallbacks = { .eofNotify = qemuProcessHandleMonitorEOF, .errorNotify = qemuProcessHandleMonitorError, @@ -1970,6 +2010,7 @@ static qemuMonitorCallbacks monitorCallbacks = { .domainRdmaGidStatusChanged = qemuProcessHandleRdmaGidStatusChanged, .domainGuestCrashloaded = qemuProcessHandleGuestCrashloaded, .domainMemoryFailure = qemuProcessHandleMemoryFailure, + .domainMemoryDeviceSizeChange = qemuProcessHandleMemoryDeviceSizeChange, }; static void -- 2.26.2

On Fri, Jan 22, 2021 at 13:50:29 +0100, Michal Privoznik wrote: [...] Menion the unit here. [...] This isn't future proof. The 'MemoryDeviceInfo' QAPI type which is the return value of 'query-memory-devices' doesn't have any permanent members, it's just an union of distinct sub types. The fields you are querying are re-defined for every type, but are not guaranteed to be present for any new type. Thus our code must not require them to be present, only when we are certain that we've got the correct discriminator. [...]

On Fri, Jan 22, 2021 at 13:50:30 +0100, Michal Privoznik wrote: During VM lifetime, qemu is actively notifying us about balloon changes via an event, so explicit refresh is wrong here. You probably want to do the calculation here depending on the old and new value instead. So this means that the balloon driver never counts the memory provided by any virtio-mem device? If that is so then this is okay, but in that case it would be worth explaining it here. If it's not the case it's wrong to add the size of the additional devices here since you'd count them twice. [...] So the following code is wrong at least in case when this branch is taken: virDomainDefGetMemoryTotal: * Returns the current maximum memory size usable by the domain described by * @def. This size includes possible additional memory devices. The total_memory size is updated in virDomainDefPostParseMemory by adding up sizes of all 'mem' devices ... ... and you then add the 'actualsize' component which is a fraction of the 'size' of a mem counted previously here. Thus when reconnecting to a VM which doesn't have ballon, but uses virtio-mem, the virtio-mem is counted twice. (This doesn't happen on refresh when starting a new VM since no guest code executed yet)

New 'update-memory' command is introduced which aims on making it user friendly to change <memory/> device. So far I just need to change <requested/> so I'm introducing --requested-size only; but the idea is that this is extensible for other cases too. For instance, want to change <myElement/>? Nnew --my-element argument can be easily introduced. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- docs/manpages/virsh.rst | 31 ++++++++ tools/virsh-domain.c | 154 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 185 insertions(+) diff --git a/docs/manpages/virsh.rst b/docs/manpages/virsh.rst index e3afa48f7b..32639e34ff 100644 --- a/docs/manpages/virsh.rst +++ b/docs/manpages/virsh.rst @@ -4891,6 +4891,37 @@ results as some fields may be autogenerated and thus match devices other than expected. +update-memory +------------- + +**Syntax:** + +:: + + update-memory domain [--print-xml] [--alias alias] + [[--live] [--config] | [--current]] + [--requested-size size] + +Update values for a ``<memory/>`` device. Not to be confused with overall +domain memory which is tuned via ``setmem`` and ``setmaxmem``. +This command finds ``<memory/>`` device inside given *domain*, changes +requested values and passes updated device XML to daemon. If *--print-xml* is +specified then the device is not changed, but the updated device XML is printed +to stdout. If there are more than one ``<memory/>`` devices in *domain* use +*--alias* to select the desired one. + +If *--live* is specified, affect a running domain. +If *--config* is specified, affect the next startup of a persistent guest. +If *--current* is specified, it is equivalent to either *--live* or +*--config*, depending on the current state of the guest. +Both *--live* and *--config* flags may be given, but *--current* is +exclusive. Not specifying any flag is the same as specifying *--current*. + +If *--requested-size* is specified then ``<requested/>`` under memory target is +changed to requested *size* (as scaled integer, see ``NOTES`` above). It +defaults to kibibytes if no suffix is provided. + + change-media ------------ diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c index 9746117bdb..0b32e6f408 100644 --- a/tools/virsh-domain.c +++ b/tools/virsh-domain.c @@ -9128,6 +9128,154 @@ cmdSetmaxmem(vshControl *ctl, const vshCmd *cmd) return ret; } + +/* + * "update-memory" command + */ +static const vshCmdInfo info_update_memory[] = { + {.name = "help", + .data = N_("update memory device of a domain") + }, + {.name = "desc", + .data = N_("Update values of a memory device of a domain") + }, + {.name = NULL} +}; + +static const vshCmdOptDef opts_update_memory[] = { + VIRSH_COMMON_OPT_DOMAIN_FULL(0), + VIRSH_COMMON_OPT_DOMAIN_CONFIG, + VIRSH_COMMON_OPT_DOMAIN_LIVE, + VIRSH_COMMON_OPT_DOMAIN_CURRENT, + {.name = "print-xml", + .type = VSH_OT_BOOL, + .help = N_("print updated memory device XML instead of executing the change") + }, + {.name = "alias", + .type = VSH_OT_STRING, + .completer = virshDomainDeviceAliasCompleter, + .help = N_("memory device alias"), + }, + {.name = "requested-size", + .type = VSH_OT_INT, + .help = N_("new value of <requested/> size, as scaled integer (default KiB)") + }, + {.name = NULL} +}; + +static int +virshGetUpdatedMemoryXML(char **updatedMemoryXML, + vshControl *ctl, + const vshCmd *cmd, + virDomainPtr dom, + unsigned int flags) +{ + const char *alias = NULL; + g_autoptr(xmlDoc) doc = NULL; + g_autoptr(xmlXPathContext) ctxt = NULL; + g_autofree char *xpath = NULL; + int nmems; + g_autofree xmlNodePtr *mems = NULL; + g_autoptr(xmlBuffer) xmlbuf = NULL; + unsigned int domainXMLFlags = 0; + + if (flags & VIR_DOMAIN_AFFECT_CONFIG) + domainXMLFlags |= VIR_DOMAIN_XML_INACTIVE; + + if (virshDomainGetXMLFromDom(ctl, dom, domainXMLFlags, &doc, &ctxt) < 0) + return -1; + + if (vshCommandOptStringReq(ctl, cmd, "alias", &alias) < 0) + return -1; + + if (alias) { + xpath = g_strdup_printf("/domain/devices/memory[./alias/@name='%s']", alias); + } else { + xpath = g_strdup("/domain/devices/memory"); + } + + nmems = virXPathNodeSet(xpath, ctxt, &mems); + if (nmems < 0) { + vshSaveLibvirtError(); + return -1; + } else if (nmems == 0) { + vshError(ctl, _("no memory device found")); + return -1; + } else if (nmems > 1) { + vshError(ctl, _("multiple memory devices found, use --alias to select one")); + return -1; + } + + ctxt->node = mems[0]; + + if (vshCommandOptBool(cmd, "requested-size")) { + xmlNodePtr requestedSizeNode; + g_autofree char *kibibytesStr = NULL; + unsigned long long bytes = 0; + unsigned long kibibytes = 0; + + if (vshCommandOptScaledInt(ctl, cmd, "requested-size", &bytes, 1024, ULLONG_MAX) < 0) + return -1; + kibibytes = VIR_DIV_UP(bytes, 1024); + + requestedSizeNode = virXPathNode("./target/requested", ctxt); + + if (!requestedSizeNode) { + vshError(ctl, _("virtio-mem device is missing <requested/>")); + return -1; + } + + kibibytesStr = g_strdup_printf("%lu", kibibytes); + xmlNodeSetContent(requestedSizeNode, BAD_CAST kibibytesStr); + } + + if (!(*updatedMemoryXML = virXMLNodeToString(doc, mems[0]))) { + vshSaveLibvirtError(); + return -1; + } + + return 0; +} + +static bool +cmdUpdateMemory(vshControl *ctl, const vshCmd *cmd) +{ + virDomainPtr dom; + bool ret = false; + bool config = vshCommandOptBool(cmd, "config"); + bool live = vshCommandOptBool(cmd, "live"); + bool current = vshCommandOptBool(cmd, "current"); + g_autofree char *updatedMemoryXML = NULL; + unsigned int flags = VIR_DOMAIN_AFFECT_CURRENT; + + VSH_EXCLUSIVE_OPTIONS_VAR(current, live); + VSH_EXCLUSIVE_OPTIONS_VAR(current, config); + + if (config) + flags |= VIR_DOMAIN_AFFECT_CONFIG; + if (live) + flags |= VIR_DOMAIN_AFFECT_LIVE; + + if (!(dom = virshCommandOptDomain(ctl, cmd, NULL))) + return false; + + if (virshGetUpdatedMemoryXML(&updatedMemoryXML, ctl, cmd, dom, flags) < 0) + goto cleanup; + + if (vshCommandOptBool(cmd, "print-xml")) { + vshPrint(ctl, "%s", updatedMemoryXML); + } else { + if (virDomainUpdateDeviceFlags(dom, updatedMemoryXML, flags) < 0) + goto cleanup; + } + + ret = true; + cleanup: + virshDomainFree(dom); + return ret; +} + + /* * "memtune" command */ @@ -14995,6 +15143,12 @@ const vshCmdDef domManagementCmds[] = { .info = info_update_device, .flags = 0 }, + {.name = "update-memory", + .handler = cmdUpdateMemory, + .opts = opts_update_memory, + .info = info_update_memory, + .flags = 0 + }, {.name = "vcpucount", .handler = cmdVcpucount, .opts = opts_vcpucount, -- 2.26.2

On Fri, Jan 22, 2021 at 13:50:31 +0100, Michal Privoznik wrote: update-memory-device-perhaps? So that you don't have to add this disclaimer? ... this document doesn't mention that it works only for the property of virtio-mem. Users of virsh tend to not read other docs, so please add it. This completes also non-memory devices. So if you don't have useraliases, you can't use this for inactive XML with 2 virtio mem? Here you mention virtio-mem. You can use g_autoptr(virshDomain) dom = NULL; on top instead of the cleanup section.

Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- NEWS.rst | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/NEWS.rst b/NEWS.rst index 7a2d6649b4..33f316c8d4 100644 --- a/NEWS.rst +++ b/NEWS.rst @@ -18,6 +18,13 @@ v7.1.0 (unreleased) The virtio-pmem is a virtio variant of NVDIMM and just like NVDIMM virtio-pmem also allows accessing host pages bypassing guest page cache. + * Introduce virtio-mem ``<memory/>`` model + + New virtio-mem model is introduced for ``<memory/>`` device which is a + paravirtualized mechanism of adding/removing memory to/from a VM. Use + ``virDomainUpdateDeviceFlags()`` API to adjust amount of memory or ``virsh + update-memory`` for convenience. + * **Improvements** * **Bug fixes** -- 2.26.2