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Re: [Qemu-ppc] [PATCH v6 0/3] ppc: handle broadcast tlb flush
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From: |
David Gibson |
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Subject: |
Re: [Qemu-ppc] [PATCH v6 0/3] ppc: handle broadcast tlb flush |
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Date: |
Wed, 21 Sep 2016 11:28:08 +1000 |
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User-agent: |
Mutt/1.7.0 (2016-08-17) |
On Tue, Sep 20, 2016 at 10:04:58PM +0530, Nikunj A Dadhania wrote:
> PowerPC failed to handle broadcast TLB flush operations. Executing
> instructions that are defined architecturally as synchronizing global TLB
> should have a global effect.
>
> * tlbie on BookS
> * tlbivax on BookE
> * H_CALLs (H_REMOVE, H_BULK_REMOVE and H_PROTECT) in case of pseries,
> since they contain a tlbie on a real hypervisor.
>
> The implementation provides a single point that can be used in MTTCG for
> doing async-flushes.
>
> The patchset introduces bit-flags in CPUPPCState::tlb_need_flush:
>
> TLB_NEED_LOCAL_FLUSH (0x1) - Flush local tlb
> TLB_NEED_GLOBAL_FLUSH (0x2) - Flush tlb on other cpus.
>
> Note: Tested patches on commit ebc231d(Merge remote-tracking branch
> 'remotes/awilliam/tags/vfio-fixes-20160915.0' into staging), as ppc64
> system emulation is broken after that.
Applied to ppc-for-2.8. I did make a couple of small tweaks to
patches 2 & 3.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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