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bh=S4i9Hkh2G74vXTt4W6AodigO60TphxXh0mjmMPlypUQ=; b=Yp0qR04PaxI5zZM+Ht3JjtRO+2sJossIa2oC2wl74pKgWQ50/7/zfHLecI1b6mdZE4VY/+ j8nEEX3DMmS5f61ml4JwGs6w3rN9HOjjs54u9mMZXJTBlbsuSGlyCk8qQkbHmiTZV50+co tdhUfguYI3XD7tAT/2CMfzzMb4/lM3Y= X-MC-Unique: rhCsI5NxOPu9mtBOh5Vjkg-1 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, alex.williamson@redhat.com Subject: [RFC v9 18/29] vfio/pci: Register handler for iommu fault Date: Sun, 11 Apr 2021 14:09:01 +0200 Message-Id: <20210411120912.15770-19-eric.auger@redhat.com> In-Reply-To: <20210411120912.15770-1-eric.auger@redhat.com> References: <20210411120912.15770-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eric.auger@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" We use the new extended IRQ VFIO_IRQ_TYPE_NESTED type and VFIO_IRQ_SUBTYPE_DMA_FAULT subtype to set/unset a notifier for physical DMA faults. The associated eventfd is triggered, in nested mode, whenever a fault is detected at IOMMU physical level. The actual handler will be implemented in subsequent patches. Signed-off-by: Eric Auger --- v4 -> v5: - index_to_str now returns the index name, ie. DMA_FAULT - use the extended IRQ v3 -> v4: - check VFIO_PCI_DMA_FAULT_IRQ_INDEX is supported at kernel level before attempting to set signaling for it. --- hw/vfio/pci.h | 7 +++++ hw/vfio/pci.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 87 insertions(+), 1 deletion(-) diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h index 64777516d1..a8b06737fb 100644 --- a/hw/vfio/pci.h +++ b/hw/vfio/pci.h @@ -114,6 +114,12 @@ typedef struct VFIOMSIXInfo { unsigned long *pending; } VFIOMSIXInfo; =20 +typedef struct VFIOPCIExtIRQ { + struct VFIOPCIDevice *vdev; + EventNotifier notifier; + uint32_t index; +} VFIOPCIExtIRQ; + #define TYPE_VFIO_PCI "vfio-pci" OBJECT_DECLARE_SIMPLE_TYPE(VFIOPCIDevice, VFIO_PCI) =20 @@ -138,6 +144,7 @@ struct VFIOPCIDevice { PCIHostDeviceAddress host; EventNotifier err_notifier; EventNotifier req_notifier; + VFIOPCIExtIRQ *ext_irqs; int (*resetfn)(struct VFIOPCIDevice *); uint32_t vendor_id; uint32_t device_id; diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index a49029dfa4..71b411b61c 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -2864,6 +2864,76 @@ static PCIPASIDOps vfio_pci_pasid_ops =3D { .set_pasid_table =3D vfio_iommu_set_pasid_table, }; =20 +static void vfio_dma_fault_notifier_handler(void *opaque) +{ + VFIOPCIExtIRQ *ext_irq =3D opaque; + + if (!event_notifier_test_and_clear(&ext_irq->notifier)) { + return; + } +} + +static int vfio_register_ext_irq_handler(VFIOPCIDevice *vdev, + uint32_t type, uint32_t subtype, + IOHandler *handler) +{ + int32_t fd, ext_irq_index, index; + struct vfio_irq_info *irq_info; + Error *err =3D NULL; + EventNotifier *n; + int ret; + + ret =3D vfio_get_dev_irq_info(&vdev->vbasedev, type, subtype, &irq_inf= o); + if (ret) { + return ret; + } + index =3D irq_info->index; + ext_irq_index =3D irq_info->index - VFIO_PCI_NUM_IRQS; + g_free(irq_info); + + vdev->ext_irqs[ext_irq_index].vdev =3D vdev; + vdev->ext_irqs[ext_irq_index].index =3D index; + n =3D &vdev->ext_irqs[ext_irq_index].notifier; + + ret =3D event_notifier_init(n, 0); + if (ret) { + error_report("vfio: Unable to init event notifier for ext irq %d(%= d)", + ext_irq_index, ret); + return ret; + } + + fd =3D event_notifier_get_fd(n); + qemu_set_fd_handler(fd, vfio_dma_fault_notifier_handler, NULL, + &vdev->ext_irqs[ext_irq_index]); + + ret =3D vfio_set_irq_signaling(&vdev->vbasedev, index, 0, + VFIO_IRQ_SET_ACTION_TRIGGER, fd, &err); + if (ret) { + error_reportf_err(err, VFIO_MSG_PREFIX, vdev->vbasedev.name); + qemu_set_fd_handler(fd, NULL, NULL, vdev); + event_notifier_cleanup(n); + } + return ret; +} + +static void vfio_unregister_ext_irq_notifiers(VFIOPCIDevice *vdev) +{ + VFIODevice *vbasedev =3D &vdev->vbasedev; + Error *err =3D NULL; + int i; + + for (i =3D 0; i < vbasedev->num_irqs - VFIO_PCI_NUM_IRQS; i++) { + if (vfio_set_irq_signaling(vbasedev, i + VFIO_PCI_NUM_IRQS , 0, + VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err))= { + error_reportf_err(err, VFIO_MSG_PREFIX, vdev->vbasedev.name); + } + qemu_set_fd_handler(event_notifier_get_fd(&vdev->ext_irqs[i].notif= ier), + NULL, NULL, vdev); + event_notifier_cleanup(&vdev->ext_irqs[i].notifier); + } + g_free(vdev->ext_irqs); +} + static void vfio_realize(PCIDevice *pdev, Error **errp) { VFIOPCIDevice *vdev =3D VFIO_PCI(pdev); @@ -2874,7 +2944,7 @@ static void vfio_realize(PCIDevice *pdev, Error **err= p) ssize_t len; struct stat st; int groupid; - int i, ret; + int i, ret, nb_ext_irqs; bool is_mdev; =20 if (!vdev->vbasedev.sysfsdev) { @@ -2962,6 +3032,11 @@ static void vfio_realize(PCIDevice *pdev, Error **er= rp) goto error; } =20 + nb_ext_irqs =3D vdev->vbasedev.num_irqs - VFIO_PCI_NUM_IRQS; + if (nb_ext_irqs > 0) { + vdev->ext_irqs =3D g_new0(VFIOPCIExtIRQ, nb_ext_irqs); + } + vfio_populate_device(vdev, &err); if (err) { error_propagate(errp, err); @@ -3173,6 +3248,9 @@ static void vfio_realize(PCIDevice *pdev, Error **err= p) =20 vfio_register_err_notifier(vdev); vfio_register_req_notifier(vdev); + vfio_register_ext_irq_handler(vdev, VFIO_IRQ_TYPE_NESTED, + VFIO_IRQ_SUBTYPE_DMA_FAULT, + vfio_dma_fault_notifier_handler); vfio_setup_resetfn_quirk(vdev); =20 pci_setup_pasid_ops(pdev, &vfio_pci_pasid_ops); @@ -3215,6 +3293,7 @@ static void vfio_exitfn(PCIDevice *pdev) =20 vfio_unregister_req_notifier(vdev); vfio_unregister_err_notifier(vdev); + vfio_unregister_ext_irq_notifiers(vdev); pci_device_set_intx_routing_notifier(&vdev->pdev, NULL); if (vdev->irqchip_change_notifier.notify) { kvm_irqchip_remove_change_notifier(&vdev->irqchip_change_notifier); --=20 2.26.3