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(p200300cbc7309700d653fb1975e5ab5c.dip0.t-ipconnect.de. [2003:cb:c730:9700:d653:fb19:75e5:ab5c]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4313f6b323asm10945305e9.36.2024.10.15.01.48.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 15 Oct 2024 01:48:21 -0700 (PDT) Message-ID: <2050b790-4d88-4e16-8af8-3bde759d5430@redhat.com> Date: Tue, 15 Oct 2024 10:48:20 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/7] Documentation: s390-diag.rst: make diag500 a generic KVM hypercall To: Heiko Carstens Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org, virtualization@lists.linux.dev, linux-doc@vger.kernel.org, kvm@vger.kernel.org, Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Thomas Huth , Cornelia Huck , Janosch Frank , Claudio Imbrenda , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , Andrew Morton , Jonathan Corbet References: <20241014144622.876731-1-david@redhat.com> <20241014144622.876731-3-david@redhat.com> <20241014180410.10447-C-hca@linux.ibm.com> <78e8794a-d89f-4ded-b102-afc7cea20d1d@redhat.com> <20241015081212.7641-A-hca@linux.ibm.com> <8e39522c-2853-4d1f-b5ec-64fabcca968b@redhat.com> <20241015082148.7641-B-hca@linux.ibm.com> <20241015084634.7641-E-hca@linux.ibm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <20241015084634.7641-E-hca@linux.ibm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: D713D40003 X-Stat-Signature: 4xqqosapx91513etxr9h4q6n9cy1ie1o X-Rspam-User: X-HE-Tag: 1728982098-692890 X-HE-Meta: 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 qw8Fd/jX 3lEGsvS9MeaReH9vaph6eLpACUENOKPT7B3Xe7rmyh08WPv0xizvO4viPlO7QkDQnS6NYmpQoX7TM/S9M0xu8ibNnIDkYKnskES2lKaA6SaM0JBwqqRb8gGiGN90+u/+be0X2MPUl0Fc3STzQ/kC9xViQV6r/Abf0tzbVwfgPqSy/3HNGgeD2Xb+X9se5Kp3RYKSdNfj6lY3vOwyApcbPnAnpOskGC+6gNGV5suwNAJPZso1DOjE1asRZorCoe92CNu77WoDKhjyKj/YE0oRQEfK92PYV3EVIXoaztkcR9TLr9O4+j3FRKtZzDQxVU81dI5YKWFoFt98+V4q+KiANzOWb2TGFKkQ6fwcS2+V5eUBtwnbQrm0i9UJ2SYJjpw/AVxG48A/OfTQii4T8ktQRKuN0cA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 15.10.24 10:46, Heiko Carstens wrote: > On Tue, Oct 15, 2024 at 10:32:43AM +0200, David Hildenbrand wrote: >> On 15.10.24 10:21, Heiko Carstens wrote: >>> On Tue, Oct 15, 2024 at 10:16:20AM +0200, David Hildenbrand wrote: >>>> On 15.10.24 10:12, Heiko Carstens wrote: >>>>> On Mon, Oct 14, 2024 at 09:35:27PM +0200, David Hildenbrand wrote: >>>>>> On 14.10.24 20:04, Heiko Carstens wrote: >>>>> "If only there would be a query subcode available, so that the program >>>>> check handling would not be necessary; but in particular my new subcode >>>>> is not worth adding it" :) >>>>> >>>>> Anyway, I do not care too much. >>>>> >>>> >>>> Okay, I see your point: it would allow for removing the program check >>>> handling from the STORAGE LIMIT invocation. >>>> >>>> ... if only we wouldn't need the exact same program check handling for the >>>> new query subfunction :P >>> >>> Yeah yeah, but I think you got that this might help in the future. >> >> Right. Adding it later also doesn't quite help to get rid of the checks >> here, because some user space might implement STORAGE LIMIT without QUERY. > > This would only help if the diag500 documentation would state that > implementation of the QUERY subcode is mandatory. That is: for every > new subcode larger than the QUERY subcode QUERY must also exist. > > That way we only would have to implement program check handling once, > if a program check happens on QUERY none of the newer subcodes is > available, otherwise the return value would indicate that. > > Otherwise this whole excercise would be pointless. Yes, that would be the idea. -- Cheers, David / dhildenb