[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [RFC] xen/arm: Handling cache maintenance instructions by set/way

>>> On 07.12.17 at 15:53, <marc.zyngier@xxxxxxx> wrote:
> On 07/12/17 13:52, Julien Grall wrote:
> There is exactly one case where set/way makes sense, and that's when
> you're the only CPU left in the system, your MMU is off, and you're
> about to go down.

With this and ...

> On top of bypassing the coherency, S/W CMOs do not prevent lines from
> migrating from one CPU to another. So you could happily be flushing by
> S/W, and still end up with dirty lines in your cache. Success!

... this I wonder what value emulating those insns then has in the first
place. Can't you as well simply skip and ignore them, with the same
(bad) result?


Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.