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Implement public API for virDomainPinIOThread
Add virDomainPinIOThread to allow setting the CPU affinity for a specific IOThread based on the output generated from virDomainGetIOThreadsInfo The API supports updating both the --live domain and the --config data
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@ -1609,6 +1609,11 @@ void virDomainIOThreadsInfoFree(virDomainIOThreadInfoPtr info);
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int virDomainGetIOThreadsInfo(virDomainPtr domain,
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int virDomainGetIOThreadsInfo(virDomainPtr domain,
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virDomainIOThreadInfoPtr **info,
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virDomainIOThreadInfoPtr **info,
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unsigned int flags);
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unsigned int flags);
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int virDomainPinIOThread(virDomainPtr domain,
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unsigned int iothread_id,
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unsigned char *cpumap,
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int maplen,
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unsigned int flags);
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/**
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/**
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* VIR_USE_CPU:
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* VIR_USE_CPU:
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@ -385,6 +385,13 @@ typedef int
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virDomainIOThreadInfoPtr **info,
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virDomainIOThreadInfoPtr **info,
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unsigned int flags);
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unsigned int flags);
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typedef int
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(*virDrvDomainPinIOThread)(virDomainPtr domain,
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unsigned int iothread_id,
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unsigned char *cpumap,
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int maplen,
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unsigned int flags);
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typedef int
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typedef int
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(*virDrvDomainGetSecurityLabel)(virDomainPtr domain,
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(*virDrvDomainGetSecurityLabel)(virDomainPtr domain,
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virSecurityLabelPtr seclabel);
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virSecurityLabelPtr seclabel);
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@ -1260,6 +1267,7 @@ struct _virHypervisorDriver {
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virDrvDomainGetVcpus domainGetVcpus;
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virDrvDomainGetVcpus domainGetVcpus;
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virDrvDomainGetMaxVcpus domainGetMaxVcpus;
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virDrvDomainGetMaxVcpus domainGetMaxVcpus;
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virDrvDomainGetIOThreadsInfo domainGetIOThreadsInfo;
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virDrvDomainGetIOThreadsInfo domainGetIOThreadsInfo;
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virDrvDomainPinIOThread domainPinIOThread;
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virDrvDomainGetSecurityLabel domainGetSecurityLabel;
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virDrvDomainGetSecurityLabel domainGetSecurityLabel;
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virDrvDomainGetSecurityLabelList domainGetSecurityLabelList;
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virDrvDomainGetSecurityLabelList domainGetSecurityLabelList;
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virDrvNodeGetSecurityModel nodeGetSecurityModel;
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virDrvNodeGetSecurityModel nodeGetSecurityModel;
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@ -7965,6 +7965,82 @@ virDomainIOThreadsInfoFree(virDomainIOThreadInfoPtr info)
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}
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}
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/**
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* virDomainPinIOThread:
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* @domain: a domain object
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* @iothread_id: the IOThread ID to set the CPU affinity
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* @cpumap: pointer to a bit map of real CPUs (in 8-bit bytes) (IN)
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* Each bit set to 1 means that corresponding CPU is usable.
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* Bytes are stored in little-endian order: CPU0-7, 8-15...
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* In each byte, lowest CPU number is least significant bit.
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* @maplen: number of bytes in cpumap, from 1 up to size of CPU map in
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* underlying virtualization system (Xen...).
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* If maplen < size, missing bytes are set to zero.
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* If maplen > size, failure code is returned.
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* @flags: bitwise-OR of virDomainModificationImpact
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*
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* Dynamically change the real CPUs which can be allocated to an IOThread.
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* This function may require privileged access to the hypervisor.
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*
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* @flags may include VIR_DOMAIN_AFFECT_LIVE or VIR_DOMAIN_AFFECT_CONFIG.
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* Both flags may be set.
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* If VIR_DOMAIN_AFFECT_LIVE is set, the change affects a running domain
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* and may fail if domain is not alive.
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* If VIR_DOMAIN_AFFECT_CONFIG is set, the change affects persistent state,
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* and will fail for transient domains. If neither flag is specified (that is,
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* @flags is VIR_DOMAIN_AFFECT_CURRENT), then an inactive domain modifies
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* persistent setup, while an active domain is hypervisor-dependent on whether
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* just live or both live and persistent state is changed.
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* Not all hypervisors can support all flag combinations.
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*
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* See also virDomainGetIOThreadsInfo for querying this information.
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*
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* Returns 0 in case of success, -1 in case of failure.
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*/
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int
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virDomainPinIOThread(virDomainPtr domain,
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unsigned int iothread_id,
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unsigned char *cpumap,
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int maplen,
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unsigned int flags)
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{
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virConnectPtr conn;
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VIR_DOMAIN_DEBUG(domain, "iothread_id=%u, cpumap=%p, maplen=%d",
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iothread_id, cpumap, maplen);
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virResetLastError();
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virCheckDomainReturn(domain, -1);
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conn = domain->conn;
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virCheckReadOnlyGoto(conn->flags, error);
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if ((unsigned short) iothread_id != iothread_id) {
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virReportError(VIR_ERR_OVERFLOW, _("input too large: %u"),
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iothread_id);
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goto error;
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}
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virCheckPositiveArgGoto(iothread_id, error);
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virCheckNonNullArgGoto(cpumap, error);
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virCheckPositiveArgGoto(maplen, error);
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if (conn->driver->domainPinIOThread) {
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int ret;
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ret = conn->driver->domainPinIOThread(domain, iothread_id,
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cpumap, maplen, flags);
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if (ret < 0)
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goto error;
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return ret;
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}
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virReportUnsupportedError();
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error:
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virDispatchError(domain->conn);
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return -1;
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}
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/**
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/**
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* virDomainGetSecurityLabel:
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* virDomainGetSecurityLabel:
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* @domain: a domain object
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* @domain: a domain object
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@ -699,6 +699,7 @@ LIBVIRT_1.2.14 {
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global:
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global:
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virDomainIOThreadsInfoFree;
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virDomainIOThreadsInfoFree;
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virDomainGetIOThreadsInfo;
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virDomainGetIOThreadsInfo;
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virDomainPinIOThread;
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} LIBVIRT_1.2.12;
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} LIBVIRT_1.2.12;
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# .... define new API here using predicted next version number ....
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# .... define new API here using predicted next version number ....
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