From 270583ed98721643cad93be0b61b300028e45c37 Mon Sep 17 00:00:00 2001 From: Cole Robinson Date: Thu, 4 Apr 2019 17:06:12 -0400 Subject: [PATCH] qemu: conf: Cache domCaps in qemuCaps qemuCaps is tied to a binary on disk. domCaps is tied to a combo of binary+machine+arch+virttype values. For the qemu driver this almost entirely translates to a permutation of qemuCaps though Upcoming patches want to use the domCaps data store at XML validate time, but we need to cache the data so we aren't repeatedly regenerating it. Add a domCapsCache hash table to qemuCaps. This ensures that the domCaps cache is blown away whenever qemuCaps needs to be regenerated. Similarly when qemuCaps is invalidated, the next call to virQEMUCapsCacheLookup will unref qemuCaps and free our cache as well. Adjust virQEMUDriverGetDomainCapabilities to search the cache and add to it if we don't find a hit. Signed-off-by: Cole Robinson Reviewed-by: Reviewed-by: Daniel Henrique Barboza Reviewed-by: Michal Privoznik --- src/qemu/qemu_capabilities.c | 11 +++++++ src/qemu/qemu_capabilities.h | 1 + src/qemu/qemu_conf.c | 60 +++++++++++++++++++++++++++++++----- 3 files changed, 65 insertions(+), 7 deletions(-) diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c index 2c46a15b0f..405bc3f288 100644 --- a/src/qemu/qemu_capabilities.c +++ b/src/qemu/qemu_capabilities.c @@ -595,6 +595,7 @@ struct _virQEMUCaps { virArch arch; + virHashTablePtr domCapsCache; virDomainCapsCPUModelsPtr kvmCPUModels; virDomainCapsCPUModelsPtr tcgCPUModels; @@ -1509,6 +1510,9 @@ virQEMUCapsNew(void) if (!(qemuCaps->flags = virBitmapNew(QEMU_CAPS_LAST))) goto error; + if (!(qemuCaps->domCapsCache = virHashCreate(5, virObjectFreeHashData))) + goto error; + return qemuCaps; error: @@ -1661,6 +1665,7 @@ void virQEMUCapsDispose(void *obj) } VIR_FREE(qemuCaps->machineTypes); + virHashFree(qemuCaps->domCapsCache); virObjectUnref(qemuCaps->kvmCPUModels); virObjectUnref(qemuCaps->tcgCPUModels); @@ -1823,6 +1828,12 @@ const char *virQEMUCapsGetPackage(virQEMUCapsPtr qemuCaps) } +virHashTablePtr virQEMUCapsGetDomainCapsCache(virQEMUCapsPtr qemuCaps) +{ + return qemuCaps->domCapsCache; +} + + int virQEMUCapsAddCPUDefinitions(virQEMUCapsPtr qemuCaps, virDomainVirtType type, diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h index 3cb56e63f4..d7c6df20c7 100644 --- a/src/qemu/qemu_capabilities.h +++ b/src/qemu/qemu_capabilities.h @@ -549,6 +549,7 @@ const char *virQEMUCapsGetBinary(virQEMUCapsPtr qemuCaps); virArch virQEMUCapsGetArch(virQEMUCapsPtr qemuCaps); unsigned int virQEMUCapsGetVersion(virQEMUCapsPtr qemuCaps); const char *virQEMUCapsGetPackage(virQEMUCapsPtr qemuCaps); +virHashTablePtr virQEMUCapsGetDomainCapsCache(virQEMUCapsPtr qemuCaps); unsigned int virQEMUCapsGetKVMVersion(virQEMUCapsPtr qemuCaps); int virQEMUCapsAddCPUDefinitions(virQEMUCapsPtr qemuCaps, virDomainVirtType type, diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c index b6aadf3587..2953893337 100644 --- a/src/qemu/qemu_conf.c +++ b/src/qemu/qemu_conf.c @@ -1364,10 +1364,39 @@ virCapsPtr virQEMUDriverGetCapabilities(virQEMUDriverPtr driver, } +struct virQEMUDriverSearchDomcapsData { + const char *path; + const char *machine; + virArch arch; + virDomainVirtType virttype; +}; + + +static int +virQEMUDriverSearchDomcaps(const void *payload, + const void *name ATTRIBUTE_UNUSED, + const void *opaque) +{ + virDomainCapsPtr domCaps = (virDomainCapsPtr) payload; + struct virQEMUDriverSearchDomcapsData *data = (struct virQEMUDriverSearchDomcapsData *) opaque; + + if (STREQ_NULLABLE(data->path, domCaps->path) && + STREQ_NULLABLE(data->machine, domCaps->machine) && + data->arch == domCaps->arch && + data->virttype == domCaps->virttype) + return 1; + + return 0; +} + /** * virQEMUDriverGetDomainCapabilities: * - * Build a virDomainCapsPtr instance for the passed data. + * Get a reference to the virDomainCapsPtr instance from the virQEMUCapsPtr + * domCapsCache. If there's no domcaps in the cache, create a new instance, + * add it to the cache, and return a reference. + * + * The caller must release the reference with virObjetUnref * * Returns: a reference to a virDomainCapsPtr instance or NULL */ @@ -1381,18 +1410,35 @@ virQEMUDriverGetDomainCapabilities(virQEMUDriverPtr driver, virDomainCapsPtr ret = NULL, domCaps = NULL; virCapsPtr caps = NULL; virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver); + virHashTablePtr domCapsCache = virQEMUCapsGetDomainCapsCache(qemuCaps); + struct virQEMUDriverSearchDomcapsData data = { + .path = virQEMUCapsGetBinary(qemuCaps), + .machine = machine, + .arch = arch, + .virttype = virttype, + }; if (!(caps = virQEMUDriverGetCapabilities(driver, false))) goto cleanup; - if (!(domCaps = virDomainCapsNew(virQEMUCapsGetBinary(qemuCaps), machine, - arch, virttype))) - goto cleanup; + domCaps = virHashSearch(domCapsCache, + virQEMUDriverSearchDomcaps, &data, NULL); + if (!domCaps) { + /* hash miss, build new domcaps */ + if (!(domCaps = virDomainCapsNew(data.path, data.machine, + data.arch, data.virttype))) + goto cleanup; - if (virQEMUCapsFillDomainCaps(caps, domCaps, qemuCaps, driver->privileged, - cfg->firmwares, cfg->nfirmwares) < 0) - goto cleanup; + if (virQEMUCapsFillDomainCaps(caps, domCaps, qemuCaps, + driver->privileged, + cfg->firmwares, cfg->nfirmwares) < 0) + goto cleanup; + if (virHashAddEntry(domCapsCache, machine, domCaps) < 0) + goto cleanup; + } + + virObjectRef(domCaps); VIR_STEAL_PTR(ret, domCaps); cleanup: virObjectUnref(domCaps);