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libvirt.29155
e6c29f09-conf-Add-support-for-specifying-CPU-ma...
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File e6c29f09-conf-Add-support-for-specifying-CPU-max-physical-add.patch of Package libvirt.29155
From a6999b15ccf3633e0bddc1c793197c00b34981e7 Mon Sep 17 00:00:00 2001 From: Dario Faggioli <dfaggioli@suse.com> Date: Fri, 29 Jul 2022 13:34:33 -0600 Subject: [PATCH 2/9] conf: Add support for specifying CPU max physical address size This patch introduces the <maxphysaddr mode='passthrough'/> <maxphysaddr mode='emulate' bits='42'/> sub element of /domain/cpu, which allows specifying the guest virtual CPU address size. This can be useful if the guest needs to have a large amount of memory. If mode='passthrough', the virtual CPU will have the same number of address bits as the host. If mode='emulate', the mandatory bits attribute specifies the number of address bits. Signed-off-by: Dario Faggioli <dfaggioli@suse.com> Signed-off-by: Jim Fehlig <jfehlig@suse.com> Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com> (cherry picked from commit e6c29f09e5b75d7a8d79ae670407060446282c78) Conflicts: src/qemu/qemu_validate.c --- docs/formatdomain.rst | 23 ++++++++++ docs/schemas/cputypes.rng | 19 ++++++++ src/conf/cpu_conf.c | 46 +++++++++++++++++++ src/conf/cpu_conf.h | 17 +++++++ src/libvirt_private.syms | 2 + src/qemu/qemu_validate.c | 41 +++++++++++++++++ .../cpu-phys-bits-emulate.xml | 20 ++++++++ .../cpu-phys-bits-passthrough.xml | 20 ++++++++ tests/genericxml2xmltest.c | 2 + 9 files changed, 190 insertions(+) create mode 100644 tests/genericxml2xmlindata/cpu-phys-bits-emulate.xml create mode 100644 tests/genericxml2xmlindata/cpu-phys-bits-passthrough.xml Index: libvirt-8.0.0/docs/formatdomain.rst =================================================================== --- libvirt-8.0.0.orig/docs/formatdomain.rst +++ libvirt-8.0.0/docs/formatdomain.rst @@ -1263,6 +1263,7 @@ following collection of elements. :since <vendor>Intel</vendor> <topology sockets='1' dies='1' cores='2' threads='1'/> <cache level='3' mode='emulate'/> + <maxphysaddr mode='emulate' bits='42'> <feature policy='disable' name='lahf_lm'/> </cpu> ... @@ -1279,6 +1280,7 @@ following collection of elements. :since <cpu mode='host-passthrough' migratable='off'> <cache mode='passthrough'/> + <maxphysaddr mode='passthrough'> <feature policy='disable' name='lahf_lm'/> ... @@ -1526,6 +1528,27 @@ In case no restrictions need to be put o The virtual CPU will report no CPU cache of the specified level (or no cache at all if the ``level`` attribute is missing). +``maxphysaddr`` + :since:`Since 8.7.0` the ``maxphysaddr`` element describes the virtual CPU + address size in bits. The hypervisor default is used if the element is missing. + + ``mode`` + This mandatory attribute specifies how the address size is presented. The + follow modes are supported: + + ``passthrough`` + The number of physical address bits reported by the host CPU will be + passed through to the virtual CPUs + ``emulate`` + The hypervisor will define a specific value for the number of bits + of physical addresses via the ``bits`` attribute, which is mandatory. + The number of bits cannot exceed the number of physical address bits + supported by the hypervisor. + + ``bits`` + The ``bits`` attribute is mandatory if the ``mode`` attribute is set to + ``emulate`` and specifies the virtual CPU address size in bits. + Guest NUMA topology can be specified using the ``numa`` element. :since:`Since 0.9.8` Index: libvirt-8.0.0/docs/schemas/cputypes.rng =================================================================== --- libvirt-8.0.0.orig/docs/schemas/cputypes.rng +++ libvirt-8.0.0/docs/schemas/cputypes.rng @@ -305,6 +305,22 @@ </element> </define> + <define name="cpuMaxPhysAddr"> + <element name="maxphysaddr"> + <attribute name="mode"> + <choice> + <value>emulate</value> + <value>passthrough</value> + </choice> + </attribute> + <optional> + <attribute name="bits"> + <ref name="unsignedInt"/> + </attribute> + </optional> + </element> + </define> + <define name="hostcpu"> <element name="cpu"> <element name="arch"> @@ -419,6 +435,9 @@ <optional> <ref name="cpuCache"/> </optional> + <optional> + <ref name="cpuMaxPhysAddr"/> + </optional> </interleave> </element> </define> Index: libvirt-8.0.0/src/conf/cpu_conf.c =================================================================== --- libvirt-8.0.0.orig/src/conf/cpu_conf.c +++ libvirt-8.0.0/src/conf/cpu_conf.c @@ -84,6 +84,12 @@ VIR_ENUM_IMPL(virCPUCacheMode, "disable", ); +VIR_ENUM_IMPL(virCPUMaxPhysAddrMode, + VIR_CPU_MAX_PHYS_ADDR_MODE_LAST, + "emulate", + "passthrough", +); + virCPUDef *virCPUDefNew(void) { @@ -129,6 +135,7 @@ virCPUDefFree(virCPUDef *def) if (g_atomic_int_dec_and_test(&def->refs)) { virCPUDefFreeModel(def); g_free(def->cache); + g_free(def->addr); g_free(def->tsc); g_free(def); } @@ -251,6 +258,11 @@ virCPUDefCopyWithoutModel(const virCPUDe *copy->cache = *cpu->cache; } + if (cpu->addr) { + copy->addr = g_new0(virCPUMaxPhysAddrDef, 1); + *copy->addr = *cpu->addr; + } + if (cpu->tsc) { copy->tsc = g_new0(virHostCPUTscInfo, 1); *copy->tsc = *cpu->tsc; @@ -321,6 +333,7 @@ virCPUDefParseXML(xmlXPathContextPtr ctx g_autoptr(virCPUDef) def = NULL; g_autofree xmlNodePtr *nodes = NULL; xmlNodePtr topology = NULL; + xmlNodePtr maxphysaddrNode = NULL; VIR_XPATH_NODE_AUTORESTORE(ctxt) int n; size_t i; @@ -644,6 +657,21 @@ virCPUDefParseXML(xmlXPathContextPtr ctx def->cache->mode = mode; } + if ((maxphysaddrNode = virXPathNode("./maxphysaddr[1]", ctxt))) { + def->addr = g_new0(virCPUMaxPhysAddrDef, 1); + + if (virXMLPropEnum(maxphysaddrNode, "mode", + virCPUMaxPhysAddrModeTypeFromString, + VIR_XML_PROP_REQUIRED, + &def->addr->mode) < 0) + return -1; + + if (virXMLPropInt(maxphysaddrNode, "bits", 10, + VIR_XML_PROP_NONNEGATIVE, + &def->addr->bits, -1) < 0) + return -1; + } + *cpu = g_steal_pointer(&def); return 0; } @@ -803,6 +831,15 @@ virCPUDefFormatBuf(virBuffer *buf, virBufferAddLit(buf, "/>\n"); } + if (def->addr) { + virBufferAddLit(buf, "<maxphysaddr "); + virBufferAsprintf(buf, "mode='%s'", + virCPUMaxPhysAddrModeTypeToString(def->addr->mode)); + if (def->addr->bits != -1) + virBufferAsprintf(buf, " bits='%d'", def->addr->bits); + virBufferAddLit(buf, "/>\n"); + } + for (i = 0; i < def->nfeatures; i++) { virCPUFeatureDef *feature = def->features + i; @@ -1065,6 +1102,15 @@ virCPUDefIsEqual(virCPUDef *src, return false; } + if ((src->addr && !dst->addr) || + (!src->addr && dst->addr) || + (src->addr && dst->addr && + (src->addr->mode != dst->addr->mode || + src->addr->bits != dst->addr->bits))) { + MISMATCH("%s", _("Target CPU maxphysaddr does not match source")); + return false; + } + if (src->nfeatures != dst->nfeatures) { MISMATCH(_("Target CPU feature count %zu does not match source %zu"), dst->nfeatures, src->nfeatures); Index: libvirt-8.0.0/src/conf/cpu_conf.h =================================================================== --- libvirt-8.0.0.orig/src/conf/cpu_conf.h +++ libvirt-8.0.0/src/conf/cpu_conf.h @@ -117,6 +117,22 @@ struct _virCPUCacheDef { }; +typedef enum { + VIR_CPU_MAX_PHYS_ADDR_MODE_EMULATE, + VIR_CPU_MAX_PHYS_ADDR_MODE_PASSTHROUGH, + + VIR_CPU_MAX_PHYS_ADDR_MODE_LAST +} virCPUMaxPhysAddrMode; + +VIR_ENUM_DECL(virCPUMaxPhysAddrMode); + +typedef struct _virCPUMaxPhysAddrDef virCPUMaxPhysAddrDef; +struct _virCPUMaxPhysAddrDef { + int bits; /* -1 for unspecified */ + virCPUMaxPhysAddrMode mode; +}; + + typedef struct _virCPUDef virCPUDef; struct _virCPUDef { int refs; @@ -138,6 +154,7 @@ struct _virCPUDef { size_t nfeatures_max; virCPUFeatureDef *features; virCPUCacheDef *cache; + virCPUMaxPhysAddrDef *addr; virHostCPUTscInfo *tsc; virTristateSwitch migratable; /* for host-passthrough mode */ }; Index: libvirt-8.0.0/src/libvirt_private.syms =================================================================== --- libvirt-8.0.0.orig/src/libvirt_private.syms +++ libvirt-8.0.0/src/libvirt_private.syms @@ -120,6 +120,8 @@ virCPUDefParseXMLString; virCPUDefRef; virCPUDefStealModel; virCPUDefUpdateFeature; +virCPUMaxPhysAddrModeTypeFromString; +virCPUMaxPhysAddrModeTypeToString; virCPUModeTypeToString; Index: libvirt-8.0.0/src/qemu/qemu_validate.c =================================================================== --- libvirt-8.0.0.orig/src/qemu/qemu_validate.c +++ libvirt-8.0.0/src/qemu/qemu_validate.c @@ -340,6 +340,47 @@ qemuValidateDomainDefCpu(virQEMUDriver * if (!cpu) return 0; + if (cpu->addr) { + const virCPUMaxPhysAddrDef *addr = cpu->addr; + + if (!ARCH_IS_X86(def->os.arch)) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("CPU maximum physical address bits specification is not supported for '%s' architecture"), + virArchToString(def->os.arch)); + return -1; + } + + switch (addr->mode) { + case VIR_CPU_MAX_PHYS_ADDR_MODE_PASSTHROUGH: + if (def->cpu->mode != VIR_CPU_MODE_HOST_PASSTHROUGH) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("CPU maximum physical address bits mode '%s' can only be used with '%s' CPUs"), + virCPUMaxPhysAddrModeTypeToString(addr->mode), + virCPUModeTypeToString(VIR_CPU_MODE_HOST_PASSTHROUGH)); + return -1; + } + if (addr->bits != -1) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("CPU maximum physical address bits number specification cannot be used with mode='%s'"), + virCPUMaxPhysAddrModeTypeToString(VIR_CPU_MAX_PHYS_ADDR_MODE_PASSTHROUGH)); + return -1; + } + break; + + case VIR_CPU_MAX_PHYS_ADDR_MODE_EMULATE: + if (addr->bits == -1) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("if using CPU maximum physical address mode='%s', bits= must be specified too"), + virCPUMaxPhysAddrModeTypeToString(VIR_CPU_MAX_PHYS_ADDR_MODE_EMULATE)); + return -1; + } + break; + + case VIR_CPU_MAX_PHYS_ADDR_MODE_LAST: + break; + } + } + if (!cpu->model && cpu->mode == VIR_CPU_MODE_CUSTOM) return 0; Index: libvirt-8.0.0/tests/genericxml2xmlindata/cpu-phys-bits-emulate.xml =================================================================== --- /dev/null +++ libvirt-8.0.0/tests/genericxml2xmlindata/cpu-phys-bits-emulate.xml @@ -0,0 +1,20 @@ +<domain type='kvm'> + <name>foo</name> + <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid> + <memory unit='KiB'>219136</memory> + <currentMemory unit='KiB'>219136</currentMemory> + <vcpu placement='static'>1</vcpu> + <os> + <type arch='i686' machine='pc'>hvm</type> + <boot dev='hd'/> + </os> + <cpu mode='host-passthrough'> + <maxphysaddr mode='emulate' bits='42'/> + </cpu> + <clock offset='utc'/> + <on_poweroff>destroy</on_poweroff> + <on_reboot>restart</on_reboot> + <on_crash>destroy</on_crash> + <devices> + </devices> +</domain> Index: libvirt-8.0.0/tests/genericxml2xmlindata/cpu-phys-bits-passthrough.xml =================================================================== --- /dev/null +++ libvirt-8.0.0/tests/genericxml2xmlindata/cpu-phys-bits-passthrough.xml @@ -0,0 +1,20 @@ +<domain type='kvm'> + <name>foo</name> + <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid> + <memory unit='KiB'>219136</memory> + <currentMemory unit='KiB'>219136</currentMemory> + <vcpu placement='static'>1</vcpu> + <os> + <type arch='i686' machine='pc'>hvm</type> + <boot dev='hd'/> + </os> + <cpu mode='host-passthrough'> + <maxphysaddr mode='passthrough'/> + </cpu> + <clock offset='utc'/> + <on_poweroff>destroy</on_poweroff> + <on_reboot>restart</on_reboot> + <on_crash>destroy</on_crash> + <devices> + </devices> +</domain> Index: libvirt-8.0.0/tests/genericxml2xmltest.c =================================================================== --- libvirt-8.0.0.orig/tests/genericxml2xmltest.c +++ libvirt-8.0.0/tests/genericxml2xmltest.c @@ -246,6 +246,8 @@ mymain(void) DO_TEST_BACKUP_FULL("backup-pull-internal-invalid", true); + DO_TEST("cpu-phys-bits-emulate"); + DO_TEST("cpu-phys-bits-passthrough"); virObjectUnref(caps); virObjectUnref(xmlopt);
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