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 X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4D96CC04AB5 for ; Mon, 3 Jun 2019 22:31:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2D96525EE6 for ; Mon, 3 Jun 2019 22:31:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726531AbfFCWbg (ORCPT ); Mon, 3 Jun 2019 18:31:36 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48996 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726101AbfFCWbf (ORCPT ); Mon, 3 Jun 2019 18:31:35 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D896D307D945; Mon, 3 Jun 2019 22:31:34 +0000 (UTC) Received: from x1.home (ovpn-116-22.phx2.redhat.com [10.3.116.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id 707CF5D9C6; Mon, 3 Jun 2019 22:31:31 +0000 (UTC) Date: Mon, 3 Jun 2019 16:31:30 -0600 From: Alex Williamson To: Eric Auger Cc: eric.auger.pro@gmail.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, joro@8bytes.org, jacob.jun.pan@linux.intel.com, yi.l.liu@intel.com, jean-philippe.brucker@arm.com, will.deacon@arm.com, robin.murphy@arm.com, kevin.tian@intel.com, ashok.raj@intel.com, marc.zyngier@arm.com, peter.maydell@linaro.org, vincent.stehle@arm.com Subject: Re: [PATCH v8 28/29] vfio-pci: Add VFIO_PCI_DMA_FAULT_IRQ_INDEX Message-ID: <20190603163130.3f7497ba@x1.home> In-Reply-To: <20190526161004.25232-29-eric.auger@redhat.com> References: <20190526161004.25232-1-eric.auger@redhat.com> <20190526161004.25232-29-eric.auger@redhat.com> Organization: Red Hat MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.48]); Mon, 03 Jun 2019 22:31:35 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 26 May 2019 18:10:03 +0200 Eric Auger wrote: > Add a new VFIO_PCI_DMA_FAULT_IRQ_INDEX index. This allows to > set/unset an eventfd that will be triggered when DMA translation > faults are detected at physical level when the nested mode is used. > > Signed-off-by: Eric Auger > --- > drivers/vfio/pci/vfio_pci.c | 3 +++ > drivers/vfio/pci/vfio_pci_intrs.c | 19 +++++++++++++++++++ > include/uapi/linux/vfio.h | 1 + > 3 files changed, 23 insertions(+) Note that I suggested to Intel folks trying to add a GVT-g page flipping eventfd to convert to device specific interrupts the same way we added device specific regions: https://patchwork.kernel.org/patch/10962337/ I'd probably suggest the same here so we can optionally expose it when supported. Thanks, Alex > diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c > index a9c8af2a774a..65a1e6814f5c 100644 > --- a/drivers/vfio/pci/vfio_pci.c > +++ b/drivers/vfio/pci/vfio_pci.c > @@ -746,6 +746,8 @@ static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type) > return 1; > } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) { > return 1; > + } else if (irq_type == VFIO_PCI_DMA_FAULT_IRQ_INDEX) { > + return 1; > } > > return 0; > @@ -1082,6 +1084,7 @@ static long vfio_pci_ioctl(void *device_data, > switch (info.index) { > case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX: > case VFIO_PCI_REQ_IRQ_INDEX: > + case VFIO_PCI_DMA_FAULT_IRQ_INDEX: > break; > case VFIO_PCI_ERR_IRQ_INDEX: > if (pci_is_pcie(vdev->pdev)) > diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c > index 1c46045b0e7f..28a96117daf3 100644 > --- a/drivers/vfio/pci/vfio_pci_intrs.c > +++ b/drivers/vfio/pci/vfio_pci_intrs.c > @@ -622,6 +622,18 @@ static int vfio_pci_set_req_trigger(struct vfio_pci_device *vdev, > count, flags, data); > } > > +static int vfio_pci_set_dma_fault_trigger(struct vfio_pci_device *vdev, > + unsigned index, unsigned start, > + unsigned count, uint32_t flags, > + void *data) > +{ > + if (index != VFIO_PCI_DMA_FAULT_IRQ_INDEX || start != 0 || count > 1) > + return -EINVAL; > + > + return vfio_pci_set_ctx_trigger_single(&vdev->dma_fault_trigger, > + count, flags, data); > +} > + > int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags, > unsigned index, unsigned start, unsigned count, > void *data) > @@ -671,6 +683,13 @@ int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags, > break; > } > break; > + case VFIO_PCI_DMA_FAULT_IRQ_INDEX: > + switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) { > + case VFIO_IRQ_SET_ACTION_TRIGGER: > + func = vfio_pci_set_dma_fault_trigger; > + break; > + } > + break; > } > > if (!func) > diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h > index 13e041b84d48..66b6b08c4a38 100644 > --- a/include/uapi/linux/vfio.h > +++ b/include/uapi/linux/vfio.h > @@ -559,6 +559,7 @@ enum { > VFIO_PCI_MSIX_IRQ_INDEX, > VFIO_PCI_ERR_IRQ_INDEX, > VFIO_PCI_REQ_IRQ_INDEX, > + VFIO_PCI_DMA_FAULT_IRQ_INDEX, > VFIO_PCI_NUM_IRQS > }; >