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Thu, 9 Oct 2025 14:54:20 GMT Received: from smtprelay07.dal12v.mail.ibm.com ([172.16.1.9]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 49nvamn2qp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 09 Oct 2025 14:54:20 +0000 Received: from smtpav01.wdc07v.mail.ibm.com (smtpav01.wdc07v.mail.ibm.com [10.39.53.228]) by smtprelay07.dal12v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 599EsIBs20054614 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 9 Oct 2025 14:54:19 GMT Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C2F5C58059; Thu, 9 Oct 2025 14:54:18 +0000 (GMT) Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B8F5D5805B; Thu, 9 Oct 2025 14:54:17 +0000 (GMT) Received: from li-479af74c-31f9-11b2-a85c-e4ddee11713b.ibm.com (unknown [9.61.142.86]) by smtpav01.wdc07v.mail.ibm.com (Postfix) with ESMTP; Thu, 9 Oct 2025 14:54:17 +0000 (GMT) Message-ID: <91a9835f6580c38aaa2dbe3d03c76bf03eb434ae.camel@linux.ibm.com> Subject: Re: [PATCH v3] s390x/pci: set kvm_msi_via_irqfd_allowed From: Eric Farman To: Matthew Rosato , qemu-s390x@nongnu.org Cc: thuth@redhat.com, pasic@linux.ibm.com, borntraeger@linux.ibm.com, richard.henderson@linaro.org, david@redhat.com, iii@linux.ibm.com, alifm@linux.ibm.com, qemu-devel@nongnu.org Date: Thu, 09 Oct 2025 10:54:17 -0400 In-Reply-To: <20251008203350.354121-1-mjrosato@linux.ibm.com> References: <20251008203350.354121-1-mjrosato@linux.ibm.com> Content-Type: text/plain; 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envelope-from=farman@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Wed, 2025-10-08 at 16:33 -0400, Matthew Rosato wrote: > Allow irqfd to be used for virtio-pci on s390x if the kernel supports > it. This improves s390x virtio-pci performance when using kvm > acceleration by allowing kvm to deliver interrupts instead of QEMU. >=20 > Signed-off-by: Matthew Rosato > --- > v3: > - Fix builds when !KVM (Thomas). Tested build on x86 and s390. > - Note: Dropped all review tags due to the code re-organization. Ah, my apologies for missing the !KVM case before. Reviewed-by: Eric Farman