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Re: [PATCH v1 03/12] s390x/tcg: convert real to absolute address for RRB

From: Cornelia Huck
Subject: Re: [PATCH v1 03/12] s390x/tcg: convert real to absolute address for RRBE, SSKE and ISKE
Date: Fri, 06 Aug 2021 13:25:33 +0200
User-agent: Notmuch/0.32.1 (https://notmuchmail.org)

On Fri, Aug 06 2021, David Hildenbrand <david@redhat.com> wrote:

> On 06.08.21 09:11, Thomas Huth wrote:
>> On 06/08/2021 08.52, David Hildenbrand wrote:
>>>> According to the PoP:
>>>> "When the enhanced-DAT facility 1 is not installed, or
>>>>     when the facility is installed but the multiple-block
>>>>     control is zero, general register R 2 contains a real
>>>>     address. When the enhanced-DAT facility 1 is
>>>>     installed and the multiple-block control is one, gen-
>>>>     eral register R 2 contains an absolute address."
>>>> Don't we have to take that into consideration here, too?
>>> We don't support EDAT1 a.k.a. huge pages yet. If we ever do, we have to
>>> further extend this code.
>> Ok, then maybe add a comment or assert() to make sure that we don't forget?
> Well, we'll need modifications and extensions all over the place to 
> support EDAT1, so I'm not sure this will really help ... we'll have to 
> carefully scan the PoP either way.

Something like
/* always real address, as long as we don't implement EDAT1 */
would still be useful, I think.

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