From: Cornelia Huck <cohuck@redhat.com>
To: Pierre Morel <pmorel@linux.ibm.com>, qemu-s390x@nongnu.org
Cc: thuth@redhat.com, ehabkost@redhat.com, david@redhat.com,
richard.henderson@linaro.org, qemu-devel@nongnu.org,
armbru@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com,
pbonzini@redhat.com, eblake@redhat.com
Subject: Re: [PATCH v1 6/9] s390x: kvm: topology: interception of PTF instruction
Date: Fri, 16 Jul 2021 13:56:29 +0200 [thread overview]
Message-ID: <87mtqmbhg2.fsf@redhat.com> (raw)
In-Reply-To: <4eee89ff-1407-9f82-a7e4-f8a1093994b5@linux.ibm.com>
On Fri, Jul 16 2021, Pierre Morel <pmorel@linux.ibm.com> wrote:
> On 7/16/21 11:22 AM, Cornelia Huck wrote:
>> On Wed, Jul 14 2021, Pierre Morel <pmorel@linux.ibm.com> wrote:
>>
>>> Interception of the PTF instruction depending on the new
>>> KVM_CAP_S390_CPU_TOPOLOGY KVM extension.
>>
>> Wasn't that the capability that you dropped?
>
> yes,
>
>>
>> Is PTF supposed to be always intercepting? If that isn't configurable,
>> wouldn't older QEMUs generate exceptions for it? I'm a bit confused.
>
> Yes, PTF generated an OPERATION exception on old QEMU, but was not used
> by the guest if it has not the topology facility 11.
>
> So just as for STSI, I think we need the KVM_CAP_S390_CPU_TOPOLOGY I
> dropped because otherwise, now that the kernel will advertise facility
> 11, the guest will use it and it will get the exception that it should
> not get.
Ok, makes sense.
next prev parent reply other threads:[~2021-07-16 11:57 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-14 16:53 [PATCH v1 0/9] s390x: CPU Topology Pierre Morel
2021-07-14 16:53 ` [PATCH v1 1/9] s390x: smp: s390x dedicated smp parsing Pierre Morel
2021-07-16 8:54 ` Cornelia Huck
2021-07-16 9:14 ` Daniel P. Berrangé
2021-07-16 10:59 ` Pierre Morel
[not found] ` <e4865ad6-f8ec-e7ba-66ef-9c95334ba9b3@linux.ibm.com>
2021-07-19 15:43 ` Cornelia Huck
2021-07-19 15:52 ` Daniel P. Berrangé
2021-07-20 7:37 ` Pierre Morel
2021-07-20 8:33 ` Pierre Morel
2021-07-16 10:47 ` Pierre Morel
2021-07-14 16:53 ` [PATCH v1 2/9] s390x: toplogy: adding drawers and books to " Pierre Morel
2021-07-15 6:16 ` Markus Armbruster
2021-07-15 8:19 ` Pierre Morel
2021-07-15 10:48 ` Markus Armbruster
2021-07-16 9:10 ` Cornelia Huck
2021-07-16 9:18 ` Daniel P. Berrangé
2021-07-16 10:44 ` Cornelia Huck
2021-07-16 10:49 ` Daniel P. Berrangé
2021-07-19 15:50 ` Cornelia Huck
2021-07-20 7:52 ` Pierre Morel
2021-07-20 8:20 ` Cornelia Huck
2021-07-20 8:46 ` Pierre Morel
2021-07-20 9:00 ` Cornelia Huck
2021-07-20 9:19 ` Daniel P. Berrangé
2021-07-20 12:29 ` Pierre Morel
2021-07-16 9:23 ` Daniel P. Berrangé
2021-07-16 11:08 ` Pierre Morel
2021-07-14 16:53 ` [PATCH v1 3/9] s390x: cpu topology: CPU topology objects and structures Pierre Morel
2021-07-14 16:53 ` [PATCH v1 4/9] s390x: Topology list entries and SYSIB 15.x.x Pierre Morel
2021-07-14 16:53 ` [PATCH v1 5/9] s390x: topology: implementating Store Topology System Information Pierre Morel
2021-07-14 16:53 ` [PATCH v1 6/9] s390x: kvm: topology: interception of PTF instruction Pierre Morel
2021-07-16 9:22 ` Cornelia Huck
2021-07-16 11:23 ` Pierre Morel
2021-07-16 11:56 ` Cornelia Huck [this message]
2021-07-14 16:53 ` [PATCH v1 7/9] s390x: SCLP: reporting the maximum nested topology entries Pierre Morel
2021-07-16 9:24 ` Cornelia Huck
2021-07-16 11:12 ` Pierre Morel
2021-07-14 16:53 ` [PATCH v1 8/9] s390x: numa: define drawers and books for NUMA Pierre Morel
2021-07-14 16:53 ` [PATCH v1 9/9] s390x: numa: implement NUMA for S390x Pierre Morel
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