Re: [libvirt] [PATCHv2 05/14] API: Introduce VIR_DOMAIN_VCPU_AGENT, for agent based CPU hot(un)plug

This flag will allow to use qemu guest agent commands to disable (offline) and enable (online) processors in a live guest that has the guest agent running. --- include/libvirt/libvirt.h.in | 1 + src/libvirt.c | 24 ++++++++++++++++++++++-- tools/virsh-domain.c | 25 +++++++++++++++++++++++-- tools/virsh.pod | 13 ++++++++++--- 4 files changed, 56 insertions(+), 7 deletions(-) diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in index 1804c93..e057be1 100644 --- a/include/libvirt/libvirt.h.in +++ b/include/libvirt/libvirt.h.in @@ -2120,6 +2120,7 @@ typedef enum { /* Additionally, these flags may be bitwise-OR'd in. */ VIR_DOMAIN_VCPU_MAXIMUM = (1 << 2), /* Max rather than current count */ + VIR_DOMAIN_VCPU_AGENT = (1 << 3), /* Use guest-agent based cpu hotplug */ } virDomainVcpuFlags;

diff --git a/src/libvirt.c b/src/libvirt.c index 6967613..820519a 100644 --- a/src/libvirt.c +++ b/src/libvirt.c @@ -8906,6 +8906,12 @@ error: * equal to virConnectGetMaxVcpus(). Otherwise, this call affects the * current virtual CPU limit, which must be less than or equal to the * maximum limit. + * + * If @flags includes VIR_DOMAIN_VCPU_AGENT, then a guest agent is used to + * modify the number of processors used by a domain. This flag can only be used + * with live guests and is incompatible with VIR_DOMAIN_VCPU_MAXIMUM as the + * maximum limit can't be changed using the guest agent.