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Re: [Xen-devel] [PATCH 08/45] xen: arm64: spinlocks



At 14:42 +0000 on 07 Feb (1360248122), Tim Deegan wrote:
> The 32-bit ones have a scattering of DSBs and SEVs that aren't there in
> 64-bit.  The DSBs at least seem useful.  Not sure about SEV - presumably
> that's useful if the slow path has a WFE in it?

OK, I see the arm64 versions are using the new load-acquire/store-release
instructions so no DSBs or DMBs should be necessary.  Still puzzled by
the SEV.

Tim.

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