Re: [qemu-s390x] [Qemu-devel] [PATCH v2 04/28] s390x/tcg: MVCL: Process max 2k bytes at a time

[Richard Henderson]

On 9/11/19 10:52 AM, Richard Henderson wrote:
> The code within Hercules breaks the action at every 2k address boundary -- for
> both src and dest.  That's the only way that actually makes sense to me, as
> otherwise we end up allowing userspace to read/write into a page without
> permission.  Which is a security hole.

Also, doesn't "2k" come from the old esa/360 page size?

Which means that we could break at 4k pages instead of 2k now
and the program wouldn't really be able to tell the difference.


r~