[Xen-devel] [PATCH 0/3] VMX: Properly handle pi descriptor and per-cpu blocking list

[Feng Wu <feng.wu@xxxxxxxxx>]

The current VT-d PI related code may operate incorrectly in the following
scenarios:
- When the last assigned device is dettached from the domain, all
the PI related hooks are removed then, however, the vCPU can be
blocked, switched to another pCPU, etc, all without the aware of
PI. After the next time we attach another device to the domain,
which makes the PI realted hooks avaliable again, the status
of the pi descriptor is not true. Beside that, the blocking vcpu
may still remain in the per-cpu blocking in this case
- After the domain is destroyed, the the blocking vcpu may also
remain in the per-cpu blocking.

This series fix the above issue.

I still have two opens, which needs comments/sugguestions from you guys.
- What shoule we do for the per-cpu blocking list during vcpu hotplug?
- What shoule we do for the per-cpu blocking list during pcpu hotplug?

Feng Wu (3):
  VMX: Properly adjuest the status of pi descriptor
  VMX: Make hook pi_do_resume always available
  VMX: Remove the vcpu from the per-cpu blocking list after domain
    termination

 xen/arch/x86/hvm/vmx/vmx.c         | 65 +++++++++++++++++++++++++++++++++++---
 xen/include/asm-x86/hvm/vmx/vmcs.h |  1 +
 2 files changed, 61 insertions(+), 5 deletions(-)

-- 
2.1.0


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