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vcpu: improve support for setting xen vcpu counts

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Tested with RHEL 5.6 (xendConfigVersion 2, where xend_internal
controls live domains and xm_internal controls inactive domains).
Hopefully this works with xendConfigVersion 3 (where xend_internal
controls everything).

* src/xen/xen_driver.c (xenUnifiedDomainSetVcpusFlags): Support
more flags.
(xenUnifiedGetMaxVcpus): Export.
* src/xen/xm_internal.h (xenXMDomainSetVcpusFlags): New prototype.
* src/xen/xend_internal.h (xenDaemonDomainSetVcpusFlags): Likewise.
* src/xen/xen_driver.h (xenUnifiedGetMaxVcpus): Likewise.
* src/xen/xm_internal.c (xenXMDomainSetVcpusFlags): New function.
* src/xen/xend_internal.c (xenDaemonDomainSetVcpusFlags): Likewise.
This commit is contained in:
Eric Blake 2010-10-14 16:17:18 -06:00
parent 290ea33111
commit e443a00312
6 changed files with 208 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
src/xen/xen_driver.c
View File

@ -508,7 +508,7 @@ xenUnifiedIsSecure(virConnectPtr conn)
return ret;
}
static int
int
xenUnifiedGetMaxVcpus (virConnectPtr conn, const char *type)
{
GET_PRIVATE(conn);
@ -1073,36 +1073,62 @@ xenUnifiedDomainSetVcpusFlags (virDomainPtr dom, unsigned int nvcpus,
unsigned int flags)
{
GET_PRIVATE(dom->conn);
int i;
int ret;
if (flags != VIR_DOMAIN_VCPU_LIVE) {
xenUnifiedError(VIR_ERR_INVALID_ARG, _("unsupported flags: (0x%x)"),
flags);
virCheckFlags(VIR_DOMAIN_VCPU_LIVE |
VIR_DOMAIN_VCPU_CONFIG |
VIR_DOMAIN_VCPU_MAXIMUM, -1);
/* At least one of LIVE or CONFIG must be set. MAXIMUM cannot be
* mixed with LIVE. */
if ((flags & (VIR_DOMAIN_VCPU_LIVE | VIR_DOMAIN_VCPU_CONFIG)) == 0 ||
(flags & (VIR_DOMAIN_VCPU_MAXIMUM | VIR_DOMAIN_VCPU_LIVE)) ==
(VIR_DOMAIN_VCPU_MAXIMUM | VIR_DOMAIN_VCPU_LIVE)) {
xenUnifiedError(VIR_ERR_INVALID_ARG,
_("invalid flag combination: (0x%x)"), flags);
return -1;
}
if (!nvcpus || (unsigned short) nvcpus != nvcpus) {
xenUnifiedError(VIR_ERR_INVALID_ARG,
_("argument out of range: %d"), nvcpus);
return -1;
}
/* Try non-hypervisor methods first, then hypervisor direct method
* as a last resort.
*/
for (i = 0; i < XEN_UNIFIED_NR_DRIVERS; ++i)
if (i != XEN_UNIFIED_HYPERVISOR_OFFSET &&
priv->opened[i] &&
drivers[i]->domainSetVcpus &&
drivers[i]->domainSetVcpus (dom, nvcpus) == 0)
return 0;
if (priv->opened[XEN_UNIFIED_HYPERVISOR_OFFSET] &&
drivers[XEN_UNIFIED_HYPERVISOR_OFFSET]->domainSetVcpus &&
drivers[XEN_UNIFIED_HYPERVISOR_OFFSET]->domainSetVcpus (dom, nvcpus) == 0)
return 0;
if (priv->opened[XEN_UNIFIED_XEND_OFFSET]) {
ret = xenDaemonDomainSetVcpusFlags(dom, nvcpus, flags);
if (ret != -2)
return ret;
}
if (priv->opened[XEN_UNIFIED_XM_OFFSET]) {
ret = xenXMDomainSetVcpusFlags(dom, nvcpus, flags);
if (ret != -2)
return ret;
}
if (flags == VIR_DOMAIN_VCPU_LIVE)
return xenHypervisorSetVcpus(dom, nvcpus);
xenUnifiedError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
return -1;
}
static int
xenUnifiedDomainSetVcpus (virDomainPtr dom, unsigned int nvcpus)
{
return xenUnifiedDomainSetVcpusFlags(dom, nvcpus, VIR_DOMAIN_VCPU_LIVE);
unsigned int flags = VIR_DOMAIN_VCPU_LIVE;
xenUnifiedPrivatePtr priv;
/* Per the documented API, it is hypervisor-dependent whether this
* affects just _LIVE or _LIVE|_CONFIG; in xen's case, that
* depends on xendConfigVersion. */
if (dom) {
priv = dom->conn->privateData;
if (priv->xendConfigVersion >= 3)
flags |= VIR_DOMAIN_VCPU_CONFIG;
}
return xenUnifiedDomainSetVcpusFlags(dom, nvcpus, flags);
}
static int

1
src/xen/xen_driver.h
View File

@ -220,6 +220,7 @@ int xenUnifiedRemoveDomainInfo(xenUnifiedDomainInfoListPtr info,
void xenUnifiedDomainEventDispatch (xenUnifiedPrivatePtr priv,
virDomainEventPtr event);
unsigned long xenUnifiedVersion(void);
int xenUnifiedGetMaxVcpus(virConnectPtr conn, const char *type);
# ifndef PROXY
void xenUnifiedLock(xenUnifiedPrivatePtr priv);

76
src/xen/xend_internal.c
View File

@ -3534,6 +3534,82 @@ xenDaemonLookupByID(virConnectPtr conn, int id) {
return (NULL);
}
/**
* xenDaemonDomainSetVcpusFlags:
* @domain: pointer to domain object
* @nvcpus: the new number of virtual CPUs for this domain
* @flags: bitwise-ORd from virDomainVcpuFlags
*
* Change virtual CPUs allocation of domain according to flags.
*
* Returns 0 on success, -1 if an error message was issued, and -2 if
* the unified driver should keep trying.
*/
int
xenDaemonDomainSetVcpusFlags(virDomainPtr domain, unsigned int vcpus,
unsigned int flags)
{
char buf[VIR_UUID_BUFLEN];
xenUnifiedPrivatePtr priv;
int max;
if ((domain == NULL) || (domain->conn == NULL) || (domain->name == NULL)
|| (vcpus < 1)) {
virXendError(VIR_ERR_INVALID_ARG, __FUNCTION__);
return (-1);
}
priv = (xenUnifiedPrivatePtr) domain->conn->privateData;
if ((domain->id < 0 && priv->xendConfigVersion < 3) ||
(flags & VIR_DOMAIN_VCPU_MAXIMUM))
return -2;
/* With xendConfigVersion 2, only _LIVE is supported. With
* xendConfigVersion 3, only _LIVE|_CONFIG is supported for
* running domains, or _CONFIG for inactive domains. */
if (priv->xendConfigVersion < 3) {
if (flags & VIR_DOMAIN_VCPU_CONFIG) {
virXendError(VIR_ERR_OPERATION_INVALID, "%s",
_("Xend version does not support modifying "
"persistent config"));
return -1;
}
} else if (domain->id < 0) {
if (flags & VIR_DOMAIN_VCPU_LIVE) {
virXendError(VIR_ERR_OPERATION_INVALID, "%s",
_("domain not running"));
return -1;
}
} else {
if ((flags & (VIR_DOMAIN_VCPU_LIVE | VIR_DOMAIN_VCPU_CONFIG)) !=
(VIR_DOMAIN_VCPU_LIVE | VIR_DOMAIN_VCPU_CONFIG)) {
virXendError(VIR_ERR_OPERATION_INVALID, "%s",
_("Xend only supports modifying both live and "
"persistent config"));
}
}
/* Unfortunately, xend_op does not validate whether this exceeds
* the maximum. */
flags |= VIR_DOMAIN_VCPU_MAXIMUM;
if ((max = xenDaemonDomainGetVcpusFlags(domain, flags)) < 0) {
virXendError(VIR_ERR_OPERATION_INVALID, "%s",
_("could not determin max vcpus for the domain"));
return -1;
}
if (vcpus > max) {
virXendError(VIR_ERR_INVALID_ARG,
_("requested vcpus is greater than max allowable"
" vcpus for the domain: %d > %d"), vcpus, max);
return -1;
}
snprintf(buf, sizeof(buf), "%d", vcpus);
return xend_op(domain->conn, domain->name, "op", "set_vcpus", "vcpus",
buf, NULL);
}
/**
* xenDaemonDomainSetVcpus:
* @domain: pointer to domain object

3
src/xen/xend_internal.h
View File

@ -151,6 +151,9 @@ int xenDaemonDomainUndefine(virDomainPtr domain);
int xenDaemonDomainSetVcpus (virDomainPtr domain,
unsigned int vcpus);
int xenDaemonDomainSetVcpusFlags (virDomainPtr domain,
unsigned int vcpus,
unsigned int flags);
int xenDaemonDomainPinVcpu (virDomainPtr domain,
unsigned int vcpu,
unsigned char *cpumap,

83
src/xen/xm_internal.c
View File

@ -1670,6 +1670,89 @@ cleanup:
return ret;
}
/*
* xenXMDomainSetVcpusFlags:
* @domain: pointer to domain object
* @nvcpus: number of vcpus
* @flags: bitwise-ORd from virDomainVcpuFlags
*
* Change virtual CPUs allocation of domain according to flags.
*
* Returns 0 on success, -1 if an error message was issued, and -2 if
* the unified driver should keep trying.
*/
int
xenXMDomainSetVcpusFlags(virDomainPtr domain, unsigned int vcpus,
unsigned int flags)
{
xenUnifiedPrivatePtr priv;
const char *filename;
xenXMConfCachePtr entry;
int ret = -1;
int max;
if ((domain == NULL) || (domain->conn == NULL) || (domain->name == NULL)) {
xenXMError(VIR_ERR_INVALID_ARG, __FUNCTION__);
return -1;
}
if (domain->conn->flags & VIR_CONNECT_RO) {
xenXMError(VIR_ERR_OPERATION_DENIED, __FUNCTION__);
return -1;
}
if (domain->id != -1)
return -2;
if (flags & VIR_DOMAIN_VCPU_LIVE) {
xenXMError(VIR_ERR_OPERATION_INVALID, "%s",
_("domain is not running"));
return -1;
}
priv = domain->conn->privateData;
xenUnifiedLock(priv);
if (!(filename = virHashLookup(priv->nameConfigMap, domain->name)))
goto cleanup;
if (!(entry = virHashLookup(priv->configCache, filename)))
goto cleanup;
/* Hypervisor maximum. */
if ((max = xenUnifiedGetMaxVcpus(domain->conn, NULL)) < 0) {
xenXMError(VIR_ERR_INTERNAL_ERROR, "%s",
_("could not determin max vcpus for the domain"));
goto cleanup;
}
/* Can't specify a current larger than stored maximum; but
* reducing maximum can silently reduce current. */
if (!(flags & VIR_DOMAIN_VCPU_MAXIMUM))
max = entry->def->maxvcpus;
if (vcpus > max) {
xenXMError(VIR_ERR_INVALID_ARG,
_("requested vcpus is greater than max allowable"
" vcpus for the domain: %d > %d"), vcpus, max);
goto cleanup;
}
if (flags & VIR_DOMAIN_VCPU_MAXIMUM) {
entry->def->maxvcpus = vcpus;
if (entry->def->vcpus > vcpus)
entry->def->vcpus = vcpus;
} else {
entry->def->vcpus = vcpus;
}
/* If this fails, should we try to undo our changes to the
* in-memory representation of the config file. I say not!
*/
if (xenXMConfigSaveFile(domain->conn, entry->filename, entry->def) < 0)
goto cleanup;
ret = 0;
cleanup:
xenUnifiedUnlock(priv);
return ret;
}
/**
* xenXMDomainGetVcpusFlags:
* @domain: pointer to domain object

2
src/xen/xm_internal.h
View File

@ -45,6 +45,8 @@ int xenXMDomainSetMemory(virDomainPtr domain, unsigned long memory);
int xenXMDomainSetMaxMemory(virDomainPtr domain, unsigned long memory);
unsigned long xenXMDomainGetMaxMemory(virDomainPtr domain);
int xenXMDomainSetVcpus(virDomainPtr domain, unsigned int vcpus);
int xenXMDomainSetVcpusFlags(virDomainPtr domain, unsigned int vcpus,
unsigned int flags);
int xenXMDomainGetVcpusFlags(virDomainPtr domain, unsigned int flags);
int xenXMDomainPinVcpu(virDomainPtr domain, unsigned int vcpu,
unsigned char *cpumap, int maplen);