From nobody Mon Feb 9 19:08:13 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1614047077; cv=none; d=zohomail.com; s=zohoarc; b=WUhE4GIvDlcT1rs75AsR+FcsbP1YfXRZ7C6jzFPp5kUutk3Ir3s2sktr1em8gjNvcJBtjW96/91khGpMswIjj1XtdChsf3RA7J0Qxob6XJMSmTPylS5N0JC4TunAMSq/r/GUj0DEFMIMoq1JYsI2hFDsbz/g0KrW4htuhglwD2Q= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1614047077; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=8CBAJkRMxtrCg7KxrhvykHCG2p+lXF1jwDt162j1T2c=; b=n85FUEtxQ5aLhWLmcUw6i/KjhZL8OpXsdFUyjgU6mlFii/QlAIXE3E9Dq8C2Zz/tWrZ65vrPMf4yiCAX/IrCvHfdrtyLEh37nyGEUJgOmQV/WbYy6HoqWmzPHAqeeioJPcZl16z6WfV5eM8G0M/0DUIq7IAORKzvL2FGZuBI4qQ= ARC-Authentication-Results: i=1; mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1614047077478955.646302769149; Mon, 22 Feb 2021 18:24:37 -0800 (PST) Received: from localhost ([::1]:58984 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lENNM-0007mm-HO for importer@patchew.org; Mon, 22 Feb 2021 21:24:36 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:52644) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lENM0-00069E-7e; Mon, 22 Feb 2021 21:23:12 -0500 Received: from szxga05-in.huawei.com ([45.249.212.191]:3487) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lENLq-0000IS-7K; Mon, 22 Feb 2021 21:23:11 -0500 Received: from DGGEMS407-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4Dl2q82RPczjRSt; Tue, 23 Feb 2021 10:21:24 +0800 (CST) Received: from DESKTOP-7FEPK9S.china.huawei.com (10.174.184.135) by DGGEMS407-HUB.china.huawei.com (10.3.19.207) with Microsoft SMTP Server id 14.3.498.0; Tue, 23 Feb 2021 10:22:53 +0800 From: Shenming Lu To: Alex Williamson , Kirti Wankhede , Cornelia Huck , , Subject: [PATCH v3 3/3] vfio: Avoid disabling and enabling vectors repeatedly in VFIO migration Date: Tue, 23 Feb 2021 10:22:25 +0800 Message-ID: <20210223022225.50-4-lushenming@huawei.com> X-Mailer: git-send-email 2.27.0.windows.1 In-Reply-To: <20210223022225.50-1-lushenming@huawei.com> References: <20210223022225.50-1-lushenming@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.174.184.135] X-CFilter-Loop: Reflected Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=45.249.212.191; envelope-from=lushenming@huawei.com; helo=szxga05-in.huawei.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Lorenzo Pieralisi , Neo Jia , mst@redhat.com, Marc Zyngier , "Dr . David Alan Gilbert" , Eric Auger , yuzenghui@huawei.com, wanghaibin.wang@huawei.com, lushenming@huawei.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" In VFIO migration resume phase and some guest startups, there are already unmasked vectors in the vector table when calling vfio_msix_enable(). So in order to avoid inefficiently disabling and enabling vectors repeatedly, let's allocate all needed vectors first and then enable these unmasked vectors one by one without disabling. Signed-off-by: Shenming Lu --- hw/pci/msix.c | 2 +- hw/vfio/pci.c | 20 +++++++++++++++++--- include/hw/pci/msix.h | 1 + 3 files changed, 19 insertions(+), 4 deletions(-) diff --git a/hw/pci/msix.c b/hw/pci/msix.c index ae9331cd0b..e057958fcd 100644 --- a/hw/pci/msix.c +++ b/hw/pci/msix.c @@ -131,7 +131,7 @@ static void msix_handle_mask_update(PCIDevice *dev, int= vector, bool was_masked) } } =20 -static bool msix_masked(PCIDevice *dev) +bool msix_masked(PCIDevice *dev) { return dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] & MSIX_MASKALL= _MASK; } diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index f74be78209..088fd41926 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -569,6 +569,9 @@ static void vfio_msix_vector_release(PCIDevice *pdev, u= nsigned int nr) =20 static void vfio_msix_enable(VFIOPCIDevice *vdev) { + PCIDevice *pdev =3D &vdev->pdev; + unsigned int nr, max_vec =3D 0; + vfio_disable_interrupts(vdev); =20 vdev->msi_vectors =3D g_new0(VFIOMSIVector, vdev->msix->entries); @@ -587,11 +590,22 @@ static void vfio_msix_enable(VFIOPCIDevice *vdev) * triggering to userspace, then immediately release the vector, leavi= ng * the physical device with no vectors enabled, but MSI-X enabled, just * like the guest view. + * If there are already unmasked vectors (in migration resume phase and + * some guest startups) which will be enabled soon, we can allocate all + * of them here to avoid inefficiently disabling and enabling vectors + * repeatedly later. */ - vfio_msix_vector_do_use(&vdev->pdev, 0, NULL, NULL); - vfio_msix_vector_release(&vdev->pdev, 0); + if (!msix_masked(pdev)) { + for (nr =3D 0; nr < msix_nr_vectors_allocated(pdev); nr++) { + if (!msix_is_masked(pdev, nr)) { + max_vec =3D nr; + } + } + } + vfio_msix_vector_do_use(pdev, max_vec, NULL, NULL); + vfio_msix_vector_release(pdev, max_vec); =20 - if (msix_set_vector_notifiers(&vdev->pdev, vfio_msix_vector_use, + if (msix_set_vector_notifiers(pdev, vfio_msix_vector_use, vfio_msix_vector_release, NULL)) { error_report("vfio: msix_set_vector_notifiers failed"); } diff --git a/include/hw/pci/msix.h b/include/hw/pci/msix.h index 4c4a60c739..b3cd88e262 100644 --- a/include/hw/pci/msix.h +++ b/include/hw/pci/msix.h @@ -28,6 +28,7 @@ void msix_load(PCIDevice *dev, QEMUFile *f); =20 int msix_enabled(PCIDevice *dev); int msix_present(PCIDevice *dev); +bool msix_masked(PCIDevice *dev); =20 bool msix_is_masked(PCIDevice *dev, unsigned vector); void msix_set_pending(PCIDevice *dev, unsigned vector); --=20 2.19.1