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Wed, 21 Feb 2024 15:36:51 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id EAD8F20040; Wed, 21 Feb 2024 15:36:48 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 731E620043; Wed, 21 Feb 2024 15:36:48 +0000 (GMT) Received: from [9.179.10.137] (unknown [9.179.10.137]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 21 Feb 2024 15:36:48 +0000 (GMT) Message-ID: <538ae248-d75d-435b-84a6-70268ccc4492@linux.ibm.com> Date: Wed, 21 Feb 2024 16:36:48 +0100 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] KVM: s390: only deliver the set service event bits Content-Language: en-US To: Eric Farman , Christian Borntraeger , Claudio Imbrenda , David Hildenbrand Cc: Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Sven Schnelle , kvm@vger.kernel.org, linux-s390@vger.kernel.org References: <20240205214300.1018522-1-farman@linux.ibm.com> From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: lo_r4_frPNfbG5nZsnSuq1w4afkyjFSi X-Proofpoint-ORIG-GUID: irdgqFv05TFnMS_OzNNJDXmOMKmWKzLv X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-21_02,2024-02-21_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 phishscore=0 mlxlogscore=870 clxscore=1015 priorityscore=1501 malwarescore=0 adultscore=0 impostorscore=0 suspectscore=0 bulkscore=0 lowpriorityscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402210120 On 2/5/24 22:43, Eric Farman wrote: > The SCLP driver code masks off the last two bits of the parameter [1] > to determine if a read is required, but doesn't care about the > contents of those bits. Meanwhile, the KVM code that delivers > event interrupts masks off those two bits but sends both to the > guest, even if only one was specified by userspace [2]. > > This works for the driver code, but it means any nuances of those > bits gets lost. Use the event pending mask as an actual mask, and > only send the bit(s) that were specified in the pending interrupt. > > [1] Linux: sclp_interrupt_handler() (drivers/s390/char/sclp.c:658) > [2] QEMU: service_interrupt() (hw/s390x/sclp.c:360..363) Reviewed-by: Janosch Frank