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Re: [PATCH] s390x: pv: Fence additional unavailable SCLP facilities for

From: Christian Borntraeger
Subject: Re: [PATCH] s390x: pv: Fence additional unavailable SCLP facilities for PV guests
Date: Tue, 8 Dec 2020 17:11:22 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0

On 08.12.20 15:55, David Hildenbrand wrote:
> On 08.12.20 14:29, Christian Borntraeger wrote:
>> On 04.12.20 09:36, Janosch Frank wrote:
>>> There's no VSIE support for a protected guest, so let's better not
>>> advertise it and its support facilities.
>>> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
>> Looks sane. Assuming that all features that depend on SIE are named 
>> S390_FEAT_SIE_*
>> this should take care of everything. (i compared to gen-facilities.c)
> We could add dependency checks to
> target/s390x/cpu_models.c:check_consistency()

That could be an additional patch, right?

> What about
> "Enhanced-suppression-on-protection facility")

ESOP does make sense independent from SIE see chapter 3-15 in the POP
in "Suppression on Protection"

> DEF_FEAT(HPMA2, "hpma2", SCLP_CONF_CHAR, 90, "Host page management
> assist 2 Facility")

Right. We should also fence of hpma2.

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