Re: [Qemu-devel] [RFC PATCH 0/3] v2.2 RCU Implementation for QEMU

[Paolo Bonzini]

Il 16/08/2013 16:41, Mike Day ha scritto:
> This patch set merges Paolo's conversion of address spaces to enable
> RCU. There is one more patchset coming for TLB access that I'm
> debugging right now. After I submit the last one I'll start working on
> enabling RCU more widely - and the series will need to be refactored.
> 
> The series is availale online at: 
> 
> https://github.com/ncultra/qemu/tree/rcu-for-1.7
> 
> Mike Day (2):
>   fixup changes from commit f63ca950
>   fixup changes from commit f62a6b2f from Paulo Bonzini
> 
> Paolo Bonzini (1):
>   exec: change iotlb APIs to take AddressSpaceDispatch
> 
>  aio-posix.c            |  1 +
>  aio-win32.c            |  1 +
>  cpus.c                 |  3 +++
>  cputlb.c               |  7 ++++---
>  exec.c                 | 13 ++++++++-----
>  include/exec/cpu-all.h |  3 +++
>  include/exec/cputlb.h  |  9 ++++++---
>  7 files changed, 26 insertions(+), 11 deletions(-)
> 

Thanks Mike!  I think iotlb APIs can be made RCU-friendly by:

1) storing an AddressSpaceDispatch in the CPUArchState (which
iotlb_to_region can then use);

2) doing tcg_commit's TLB flush in the VCPU thread.

I'll pick up your changes and post the RCU patches in a few weeks.

Paolo