From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 30501CCA476 for ; Fri, 10 Oct 2025 08:23:36 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1v78OP-0002BS-A6; Fri, 10 Oct 2025 04:22:25 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1v78OL-0002AV-BA for qemu-devel@nongnu.org; Fri, 10 Oct 2025 04:22:21 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1v78OF-0001Bc-ND for qemu-devel@nongnu.org; Fri, 10 Oct 2025 04:22:21 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1760084534; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GkEwpiKaLxBSUhV5xR+XfwVb/cPt8uBBF9xkbsKEvGo=; b=NM4lUQ/11zgjEASPZvUbFVTaH8owT0v0qmAnubVCETfvrbzsXwRknqe3bBPwurkTx0aArs 21ZjlyyixSP7OXJNjuqoGqC0L/l3nDdNzhu3avW8CxUBeebXdvO350oozH4EayCDjyAjJu 6m8LtxAxp8MfikDFiwGDP0KMn8m0EUk= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-674-bX2RmarzP12cibn2KWB0Tg-1; Fri, 10 Oct 2025 04:22:09 -0400 X-MC-Unique: bX2RmarzP12cibn2KWB0Tg-1 X-Mimecast-MFC-AGG-ID: bX2RmarzP12cibn2KWB0Tg_1760084528 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 2E8B7180057C; Fri, 10 Oct 2025 08:22:08 +0000 (UTC) Received: from thuth-p1g4.redhat.com (unknown [10.44.34.98]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 21BA51800452; Fri, 10 Oct 2025 08:22:05 +0000 (UTC) From: Thomas Huth To: qemu-devel@nongnu.org Cc: Richard Henderson , Matthew Rosato , Farhan Ali , Eric Farman Subject: [PULL 9/9] s390x/pci: set kvm_msi_via_irqfd_allowed Date: Fri, 10 Oct 2025 10:21:44 +0200 Message-ID: <20251010082145.576222-10-thuth@redhat.com> In-Reply-To: <20251010082145.576222-1-thuth@redhat.com> References: <20251010082145.576222-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Received-SPF: pass client-ip=170.10.133.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.438, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-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 From: Matthew Rosato 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. Signed-off-by: Matthew Rosato Reviewed-by: Farhan Ali Reviewed-by: Eric Farman Message-ID: <20251008203350.354121-1-mjrosato@linux.ibm.com> Signed-off-by: Thomas Huth --- include/hw/s390x/s390-pci-kvm.h | 7 +++++++ hw/s390x/s390-pci-bus.c | 1 + 2 files changed, 8 insertions(+) diff --git a/include/hw/s390x/s390-pci-kvm.h b/include/hw/s390x/s390-pci-kvm.h index 933814a4025..c33f2833a3c 100644 --- a/include/hw/s390x/s390-pci-kvm.h +++ b/include/hw/s390x/s390-pci-kvm.h @@ -14,12 +14,19 @@ #include "hw/s390x/s390-pci-bus.h" #include "hw/s390x/s390-pci-inst.h" +#include "system/kvm.h" #ifdef CONFIG_KVM +static inline void s390_pcihost_kvm_realize(void) +{ + kvm_msi_via_irqfd_allowed = kvm_irqfds_enabled(); +} + bool s390_pci_kvm_interp_allowed(void); int s390_pci_kvm_aif_enable(S390PCIBusDevice *pbdev, ZpciFib *fib, bool assist); int s390_pci_kvm_aif_disable(S390PCIBusDevice *pbdev); #else +static inline void s390_pcihost_kvm_realize(void) {} static inline bool s390_pci_kvm_interp_allowed(void) { return false; diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c index e8e41c8a9a1..52820894fa1 100644 --- a/hw/s390x/s390-pci-bus.c +++ b/hw/s390x/s390-pci-bus.c @@ -900,6 +900,7 @@ static void s390_pcihost_realize(DeviceState *dev, Error **errp) s390_pci_init_default_group(); css_register_io_adapters(CSS_IO_ADAPTER_PCI, true, false, S390_ADAPTER_SUPPRESSIBLE, errp); + s390_pcihost_kvm_realize(); } static void s390_pcihost_unrealize(DeviceState *dev) -- 2.51.0