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Implement CPU topology support for QEMU driver
QEMU's command line equivalent for the following domain XML fragment <vcpus>2</vcpus> <cpu ...> ... <topology sockets='1' cores='2', threads='1'/> </cpu> is -smp 2,sockets=1,cores=2,threads=1 This syntax was introduced in QEMU-0.12. Version 2 changes: - -smp argument build split into a separate function - always add ",sockets=S,cores=C,threads=T" to -smp if qemu supports it - use qemuParseCommandLineKeywords for command line parsing Version 3 changes: - ADD_ARG_LIT => ADD_ARG and line reordering in qemudBuildCommandLine - rebased Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
This commit is contained in:
parent
014c9f3196
commit
5d462bd0b3
@ -1,7 +1,7 @@
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/*
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/*
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* qemu_conf.c: QEMU configuration management
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* qemu_conf.c: QEMU configuration management
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*
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*
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* Copyright (C) 2006, 2007, 2008, 2009 Red Hat, Inc.
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* Copyright (C) 2006, 2007, 2008, 2009, 2010 Red Hat, Inc.
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* Copyright (C) 2006 Daniel P. Berrange
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* Copyright (C) 2006 Daniel P. Berrange
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*
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*
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* This library is free software; you can redistribute it and/or
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* This library is free software; you can redistribute it and/or
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@ -1119,6 +1119,10 @@ static unsigned int qemudComputeCmdFlags(const char *help,
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flags |= QEMUD_CMD_FLAG_DEVICE;
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flags |= QEMUD_CMD_FLAG_DEVICE;
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if (strstr(help, "-sdl"))
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if (strstr(help, "-sdl"))
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flags |= QEMUD_CMD_FLAG_SDL;
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flags |= QEMUD_CMD_FLAG_SDL;
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if (strstr(help, "cores=") &&
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strstr(help, "threads=") &&
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strstr(help, "sockets="))
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flags |= QEMUD_CMD_FLAG_SMP_TOPOLOGY;
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if (version >= 9000)
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if (version >= 9000)
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flags |= QEMUD_CMD_FLAG_VNC_COLON;
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flags |= QEMUD_CMD_FLAG_VNC_COLON;
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@ -2676,6 +2680,39 @@ no_memory:
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goto cleanup;
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goto cleanup;
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}
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}
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static char *
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qemudBuildCommandLineSmp(virConnectPtr conn,
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const virDomainDefPtr def,
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int qemuCmdFlags)
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{
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virBuffer buf = VIR_BUFFER_INITIALIZER;
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virBufferVSprintf(&buf, "%lu", def->vcpus);
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if ((qemuCmdFlags & QEMUD_CMD_FLAG_SMP_TOPOLOGY)) {
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/* sockets, cores, and threads are either all zero
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* or all non-zero, thus checking one of them is enough */
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if (def->cpu && def->cpu->sockets) {
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virBufferVSprintf(&buf, ",sockets=%u", def->cpu->sockets);
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virBufferVSprintf(&buf, ",cores=%u", def->cpu->cores);
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virBufferVSprintf(&buf, ",threads=%u", def->cpu->threads);
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}
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else {
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virBufferVSprintf(&buf, ",sockets=%lu", def->vcpus);
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virBufferVSprintf(&buf, ",cores=%u", 1);
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virBufferVSprintf(&buf, ",threads=%u", 1);
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}
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}
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if (virBufferError(&buf)) {
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virBufferFreeAndReset(&buf);
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virReportOOMError(conn);
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return NULL;
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}
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return virBufferContentAndReset(&buf);
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}
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/*
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/*
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* Constructs a argv suitable for launching qemu with config defined
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* Constructs a argv suitable for launching qemu with config defined
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@ -2694,7 +2731,6 @@ int qemudBuildCommandLine(virConnectPtr conn,
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const char *migrateFrom) {
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const char *migrateFrom) {
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int i;
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int i;
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char memory[50];
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char memory[50];
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char vcpus[50];
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char boot[VIR_DOMAIN_BOOT_LAST];
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char boot[VIR_DOMAIN_BOOT_LAST];
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struct utsname ut;
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struct utsname ut;
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int disableKQEMU = 0;
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int disableKQEMU = 0;
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@ -2708,6 +2744,7 @@ int qemudBuildCommandLine(virConnectPtr conn,
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char uuid[VIR_UUID_STRING_BUFLEN];
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char uuid[VIR_UUID_STRING_BUFLEN];
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char domid[50];
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char domid[50];
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char *cpu;
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char *cpu;
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char *smp;
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uname_normalize(&ut);
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uname_normalize(&ut);
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@ -2850,7 +2887,6 @@ int qemudBuildCommandLine(virConnectPtr conn,
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* is not supported, then they're out of luck anyway
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* is not supported, then they're out of luck anyway
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*/
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*/
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snprintf(memory, sizeof(memory), "%lu", def->maxmem/1024);
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snprintf(memory, sizeof(memory), "%lu", def->maxmem/1024);
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snprintf(vcpus, sizeof(vcpus), "%lu", def->vcpus);
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snprintf(domid, sizeof(domid), "%d", def->id);
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snprintf(domid, sizeof(domid), "%d", def->id);
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ADD_ENV_LIT("LC_ALL=C");
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ADD_ENV_LIT("LC_ALL=C");
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@ -2913,8 +2949,11 @@ int qemudBuildCommandLine(virConnectPtr conn,
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ADD_ARG_LIT("-mem-path");
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ADD_ARG_LIT("-mem-path");
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ADD_ARG_LIT(driver->hugepage_path);
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ADD_ARG_LIT(driver->hugepage_path);
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}
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}
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ADD_ARG_LIT("-smp");
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ADD_ARG_LIT("-smp");
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ADD_ARG_LIT(vcpus);
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if (!(smp = qemudBuildCommandLineSmp(conn, def, qemuCmdFlags)))
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goto error;
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ADD_ARG(smp);
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if (qemuCmdFlags & QEMUD_CMD_FLAG_NAME) {
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if (qemuCmdFlags & QEMUD_CMD_FLAG_NAME) {
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ADD_ARG_LIT("-name");
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ADD_ARG_LIT("-name");
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@ -4647,6 +4686,27 @@ error:
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}
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}
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static virCPUDefPtr
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qemuInitGuestCPU(virConnectPtr conn,
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virDomainDefPtr dom)
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{
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if (!dom->cpu) {
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virCPUDefPtr cpu;
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if (VIR_ALLOC(cpu) < 0) {
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virReportOOMError(conn);
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return NULL;
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}
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cpu->type = VIR_CPU_TYPE_GUEST;
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cpu->match = VIR_CPU_MATCH_EXACT;
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dom->cpu = cpu;
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}
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return dom->cpu;
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}
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static int
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static int
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qemuParseCommandLineCPU(virConnectPtr conn,
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qemuParseCommandLineCPU(virConnectPtr conn,
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virDomainDefPtr dom,
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virDomainDefPtr dom,
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@ -4656,10 +4716,8 @@ qemuParseCommandLineCPU(virConnectPtr conn,
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const char *p = val;
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const char *p = val;
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const char *next;
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const char *next;
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if (VIR_ALLOC(cpu) < 0)
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if (!(cpu = qemuInitGuestCPU(conn, dom)))
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goto no_memory;
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goto error;
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cpu->type = VIR_CPU_TYPE_GUEST;
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do {
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do {
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if (*p == '\0' || *p == ',')
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if (*p == '\0' || *p == ',')
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@ -4703,7 +4761,6 @@ qemuParseCommandLineCPU(virConnectPtr conn,
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}
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}
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} while ((p = next));
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} while ((p = next));
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dom->cpu = cpu;
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return 0;
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return 0;
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syntax:
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syntax:
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@ -4714,11 +4771,84 @@ syntax:
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no_memory:
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no_memory:
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virReportOOMError(conn);
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virReportOOMError(conn);
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error:
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error:
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virCPUDefFree(cpu);
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return -1;
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return -1;
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}
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}
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static int
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qemuParseCommandLineSmp(virConnectPtr conn,
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virDomainDefPtr dom,
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const char *val)
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{
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unsigned int sockets = 0;
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unsigned int cores = 0;
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unsigned int threads = 0;
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int i;
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int nkws;
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char **kws;
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char **vals;
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int n;
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char *end;
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int ret;
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nkws = qemuParseCommandLineKeywords(conn, val, &kws, &vals, 1);
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if (nkws < 0)
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return -1;
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for (i = 0; i < nkws; i++) {
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if (vals[i] == NULL) {
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if (i > 0 ||
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virStrToLong_i(kws[i], &end, 10, &n) < 0 ||
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!end || *end != '\0')
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goto syntax;
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dom->vcpus = n;
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} else {
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if (virStrToLong_i(vals[i], &end, 10, &n) < 0 ||
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!end || *end != '\0')
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goto syntax;
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if (STREQ(kws[i], "sockets"))
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sockets = n;
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else if (STREQ(kws[i], "cores"))
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cores = n;
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else if (STREQ(kws[i], "threads"))
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threads = n;
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else
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goto syntax;
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}
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}
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if (sockets && cores && threads) {
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virCPUDefPtr cpu;
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if (!(cpu = qemuInitGuestCPU(conn, dom)))
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goto error;
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cpu->sockets = sockets;
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cpu->cores = cores;
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cpu->threads = threads;
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} else if (sockets || cores || threads)
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goto syntax;
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ret = 0;
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cleanup:
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for (i = 0; i < nkws; i++) {
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VIR_FREE(kws[i]);
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VIR_FREE(vals[i]);
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}
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VIR_FREE(kws);
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VIR_FREE(vals);
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return ret;
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syntax:
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qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
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_("cannot parse CPU topology '%s'"), val);
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error:
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ret = -1;
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goto cleanup;
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}
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/*
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/*
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* Analyse the env and argv settings and reconstruct a
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* Analyse the env and argv settings and reconstruct a
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* virDomainDefPtr representing these settings as closely
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* virDomainDefPtr representing these settings as closely
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@ -4867,14 +4997,9 @@ virDomainDefPtr qemuParseCommandLine(virConnectPtr conn,
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}
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}
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def->memory = def->maxmem = mem * 1024;
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def->memory = def->maxmem = mem * 1024;
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} else if (STREQ(arg, "-smp")) {
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} else if (STREQ(arg, "-smp")) {
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int vcpus;
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WANT_VALUE();
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WANT_VALUE();
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if (virStrToLong_i(val, NULL, 10, &vcpus) < 0) {
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if (qemuParseCommandLineSmp(conn, def, val) < 0)
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qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, \
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_("cannot parse CPU count '%s'"), val);
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goto error;
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goto error;
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}
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def->vcpus = vcpus;
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} else if (STREQ(arg, "-uuid")) {
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} else if (STREQ(arg, "-uuid")) {
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WANT_VALUE();
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WANT_VALUE();
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if (virUUIDParse(val, def->uuid) < 0) {
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if (virUUIDParse(val, def->uuid) < 0) {
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@ -1,7 +1,7 @@
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/*
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/*
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* qemu_conf.h: QEMU configuration management
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* qemu_conf.h: QEMU configuration management
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*
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*
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* Copyright (C) 2006, 2007, 2009 Red Hat, Inc.
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* Copyright (C) 2006, 2007, 2009, 2010 Red Hat, Inc.
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* Copyright (C) 2006 Daniel P. Berrange
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* Copyright (C) 2006 Daniel P. Berrange
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*
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*
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* This library is free software; you can redistribute it and/or
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* This library is free software; you can redistribute it and/or
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@ -80,6 +80,7 @@ enum qemud_cmd_flags {
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QEMUD_CMD_FLAG_BALLOON = (1 << 25), /* -balloon available */
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QEMUD_CMD_FLAG_BALLOON = (1 << 25), /* -balloon available */
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QEMUD_CMD_FLAG_DEVICE = (1 << 26), /* Is the new -device arg available */
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QEMUD_CMD_FLAG_DEVICE = (1 << 26), /* Is the new -device arg available */
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QEMUD_CMD_FLAG_SDL = (1 << 27), /* Is the new -sdl arg available */
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QEMUD_CMD_FLAG_SDL = (1 << 27), /* Is the new -sdl arg available */
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QEMUD_CMD_FLAG_SMP_TOPOLOGY = (1 << 28), /* Is sockets=s,cores=c,threads=t available for -smp? */
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};
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};
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/* Main driver state */
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/* Main driver state */
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@ -223,7 +223,8 @@ mymain(int argc, char **argv)
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QEMUD_CMD_FLAG_MIGRATE_QEMU_UNIX |
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QEMUD_CMD_FLAG_MIGRATE_QEMU_UNIX |
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QEMUD_CMD_FLAG_CHARDEV |
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QEMUD_CMD_FLAG_CHARDEV |
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QEMUD_CMD_FLAG_BALLOON |
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QEMUD_CMD_FLAG_BALLOON |
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QEMUD_CMD_FLAG_DEVICE,
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QEMUD_CMD_FLAG_DEVICE |
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QEMUD_CMD_FLAG_SMP_TOPOLOGY,
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12001, 0, 0);
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12001, 0, 0);
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return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
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return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
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