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[Xen-devel] [PATCH] 0/2 VCPU creation and allocation

I've put together two patches.  The first introduces a new dom0_op,
set_max_vcpus, which with an associated variable and a check in the
VCPUOP handler fixes [1]bug 288.  Also included is a new VCPUOP, 
VCPUOP_create, which handles all of the vcpu creation tasks and leaves
initialization and unpausing to VCPUOP_initialize.  The separation
allows for build-time allocation of vcpus which becomes more important
when trying to allocate memory in a NUMA-aware manner (i.e. knowing
which physical cpus are being used in a domain before we allocate the

The second patch adds a new domain allocmap cpumap_t which is a bitmap
of physical cpus from which vcpus are to be allocated.  As vcpus are
created, the selection of which physical cpu is balanced across the set
of physical cpus within the map.  The patch lets us control vcpu
allocation at a high level (start all VCPUS on hyperthreads, NODE1,

1. http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=288

Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253   T/L: 678-9253

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