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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <155d2ca3-6a48-c99a-fe42-dca8e3fd4344@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19051408-0028-0000-0000-0000036D765B X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19051408-0029-0000-0000-0000242D0722 Message-Id: <066c7470-94a3-a922-9a12-1ca42e474c51@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-05-14_05:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905140063 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.156.1 Subject: Re: [Qemu-devel] [PATCH v4] s390: diagnose 318 info reset and migration support X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Collin Walling , mst@redhat.com, qemu-devel@nongnu.org, pasic@linux.ibm.com, qemu-s390x@nongnu.org, pbonzini@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 14.05.19 09:28, David Hildenbrand wrote: >>>> But that can be tested using the runability information if I am not wrong. >>> >>> You mean the cpu level information, right? > > Yes, query-cpu-definition includes for each model runability information > via "unavailable-features" (valid under the started QEMU machine). > >>> >>>> >>>>> and others that we have today. >>>>> >>>>> So yes, I think this would be acceptable. >>>> >>>> I guess it is acceptable yes. I doubt anybody uses that many CPUs in >>>> production either way. But you never know. >>> >>> I think that using that many cpus is a more uncommon setup, but I still >>> think that having to wait for actual failure >> >> That can happen all the time today. You can easily say z14 in the xml when >> on a zEC12. Only at startup you get the error. The question is really: > > "-smp 248 -cpu host" will no longer work, while e.g. "-smp 248 -cpu z12" > will work. Actually, even "-smp 248" will no longer work on affected > machines. > > That is why wonder if it is better to disable the feature and print a > warning. Similar to CMMA, where want want to tolerate when CMMA is not > possible in the current environment (huge pages). > > "Diag318 will not be enabled because it is not compatible with more than > 240 CPUs". > > However, I still think that implementing support for more than one SCLP > response page is the best solution. Guests will need adaptions for > 240 > CPUs with Diag318, but who cares? Existing setups will continue to work. > > Implementing that SCLP thingy will avoid any warnings and any errors. It > just works from the QEMU perspective. > > Is implementing this realistic? Yes it is but it will take time. I will try to get this rolling. To make progress on the diag318 thing, can we error on startup now and simply remove that check when when have implemented a larger sccb? If we would now do all kinds of "change the max number games" would be harder to "fix". > >> do you want to error on definition of the xml or on startup. > > I actually have no idea what the best practice on the libvirt side is. > There seems to be a user for max-cpus and unavailable-features in QEMU. > > And I think >> startup is the better place here. This allows to create definitions that will >> be useful in the future (pre-planning), e.g. if you know that you will update >> your machine or the code soon. > > >