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Thu, 5 Nov 2026 08:05:20 +0000 (GMT) Received: from [9.68.16.159] (unknown [9.68.16.159]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 5 Nov 2026 08:05:20 +0000 (GMT) Message-ID: Date: Thu, 5 Nov 2026 09:05:20 +0100 X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/2] KVM: selftests: Test that KVM_RUN fails for unresolvable host faults To: Sean Christopherson Cc: frankja@linux.ibm.com, imbrenda@linux.ibm.com, kvm@vger.kernel.org, linux-s390@vger.kernel.org, pbonzini@redhat.com, shuah@kernel.org References: <50a3ff35-ae53-4372-a53c-c07f1d153627@linux.ibm.com> <20261023140506.336663-1-borntraeger@linux.ibm.com> <421ebe63-dd9a-4da6-a2f6-104a9473b301@linux.ibm.com> Content-Language: en-US From: Christian Borntraeger In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: rxpZi2Vegphh2HNxgytCciFbCxyejKqo X-Proofpoint-ORIG-GUID: R5NcSGLEs4Ednqcamf7zr7YDR5mRZkAn X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTA1MDAzMCBTYWx0ZWRfX240lZQtnxnf8 2CT2eWmQnUgLXIzJPj/0Bsgbgf6YYQ1uaA+ETB8qShqi5WtWAeGBsqojM3dwYahWptFdV4CT1JT FP/eHQS8UQG6hm3I5kBIBje1gQtgut7GxbFXcQSiaCzdSv0zG8RVJuQjvN9a+yJ/07T/tNAKasR lL04KZ7If84FTL5mLiuj37GljvjtHadaH9O7qCn8Zgv72a10wLIlSDQL51jMJKzFZGPsJTFvznj TLy/CwhldYjYvjc2ZfJ0boPGfsgteTXk4OrBzYTMTajGa6RFp0JBSjiU8FrPovJAC8yWWnsB828 AKTwzsyscNWggER9I8fCc2NwttHF6/z7pW1S/n+ezWKEGksSKSCjBBlllx3/6Y4n6r5aIQR8Hta P5mQIWO1EyVcCvIF1fQEBjZnQgj2SXMec+mf3O09tlFo9mmTfRVBIoR3HCKlYeprv+D/PKfzL0s H8YT5+AeNBFjQBIQMOg== X-Proofpoint-Spam-Info: AW1haW4tMjYxMTA1MDAzMCBTYWx0ZWRfXxstCPXk4dJeG icULEHvktvN7jkF87KVKwFgtLVzxuQZpYvkSVB/kf+wX0FL9TUhOXq5f9QJ+WW4azYbDsuAthxI gwOWszytVn3M8a1aIj/cmUEIdWsNOTs= X-Authority-Analysis: v=2.4 cv=FIqOVOos c=1 sm=1 tr=0 ts=6aec38c5 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=1d9LwUIU6U584Mw3tb0A:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-05_02,2026-11-04_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 malwarescore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 bulkscore=0 suspectscore=0 clxscore=1015 priorityscore=1501 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610300000 definitions=main-2611050030 Am 05.11.26 um 02:02 schrieb Sean Christopherson: > On Tue, Oct 27, 2026, Christian Borntraeger wrote: >> Am 23.10.26 um 17:06 schrieb Sean Christopherson: >>> On Fri, Oct 23, 2026, Christian Borntraeger wrote: >>>> Add a test in which the guest writes to a shmem-backed memslot beyond >>>> the end of the file. KVM_RUN must fail with -EFAULT. >>>> >>>> On x86 the guest enables interrupts, and on s390 the test sets up >>>> pfault, so that KVM could handle the fault with an asynchronous page >>>> fault. If KVM mistakes the error for a fault that needs I/O, the vCPU >>>> retries the access forever, and the test fails after a timeout. >>>> >>>> The test is not built for LoongArch, which handles a failed mapping as >>>> an MMIO access. >>>> >>>> Signed-off-by: Christian Borntraeger >>>> --- >>>> I went with Seans name proposal >>> >>> Aww, bummer. If you posted a faulty_mcfault_face_test, I would absolutely apply >>> that and force Paolo to tell me no :-) >> >> Sean, >> Will you pick up the fix and the selftest, shall I do it or Paolo directly? > > I can grab 'em. Were you hoping to get the fix into 7.4? It doesn't seem super > urgent? I was leaning towards waiting for 7.5, but tagging it for stable@. I.e. > give ourselves a full cycle to make sure we didn't miss something, then get the > fix backported because I wouldn't be surprised if people are hitting this in > production without realizing it. No, not super urgent. Might not even qualify for stable.