[Xen-devel] [PATCH v2] Fix xl vcpu-set to decrease amount of vCPUS without warnining.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

Hey,

This patchset had been floating in the past. The aim for is to allow
the user to do 'xl vcpu-set <domain-id> X' where the X can be bigger
than the amount of physical CPUs the machine has. You can do this by
launching an guest with huge amount of virtual CPUs without issues.

From 
(http://lists.xenproject.org/archives/html/xen-devel/2015-02/msg00216.html):
"

Let me rehash what we had in set in stone way back in 4.4:
 - The guest config ('maxvcpus') is permitted to be greater than the pCPUs.
   Ditto for the initially allocated ('vcpus') amounts. It is also
   OK to be different - 'vcpus' < 'maxvcpus', etc.

 - If the 'vcpus' < pCPUs and we want to increase it above pCPUs we should
   error out and print out a warning telling them to use --ignore-host.
   Regardless of the dominfo.max_vcpu_id - so if the max_vpcu_id is
   greater than pCPU and 'vcpu' < pCPU, we should still warn the user
   when increasing.

 - If the 'vcpus' > pCPUs and we want to decrease to be below pCPUs then
   we should do that without the warning.
   (this is what the patchset is fixing).

"

However during the fixes an request was made to have libxl_domain_info
return a more proper return value when there are no domains found - hence:
 [PATCH v2 1/5] libxl: Add ERROR_NOTFOUND for libxl_domain_info when

is part of this patchset.


 tools/libxl/libxl.c         | 18 +++++++++------
 tools/libxl/libxl.h         |  4 +++-
 tools/libxl/libxl_types.idl |  1 +
 tools/libxl/xl_cmdimpl.c    | 55 +++++++++++++++++++++++++++++----------------
 4 files changed, 51 insertions(+), 27 deletions(-)


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