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[79.178.2.214]) by smtp.gmail.com with ESMTPSA id n23sm1414050qtr.87.2020.02.25.07.13.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Feb 2020 07:13:53 -0800 (PST) Date: Tue, 25 Feb 2020 10:13:49 -0500 From: "Michael S. Tsirkin" To: qemu-devel@nongnu.org Subject: [PULL 17/32] virtio-iommu: Implement fault reporting Message-ID: <20200225151210.647797-18-mst@redhat.com> References: <20200225151210.647797-1-mst@redhat.com> MIME-Version: 1.0 In-Reply-To: <20200225151210.647797-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 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: Peter Maydell , Peter Xu , Eric Auger Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Eric Auger The event queue allows to report asynchronous errors. The translate function now injects faults when relevant. Signed-off-by: Eric Auger Reviewed-by: Peter Xu Reviewed-by: Michael S. Tsirkin Message-Id: <20200214132745.23392-7-eric.auger@redhat.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/virtio/virtio-iommu.c | 70 +++++++++++++++++++++++++++++++++++++--- hw/virtio/trace-events | 1 + 2 files changed, 66 insertions(+), 5 deletions(-) diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c index 59e9cd3d9a..8509f64004 100644 --- a/hw/virtio/virtio-iommu.c +++ b/hw/virtio/virtio-iommu.c @@ -468,6 +468,48 @@ out: } } =20 +static void virtio_iommu_report_fault(VirtIOIOMMU *viommu, uint8_t reason, + int flags, uint32_t endpoint, + uint64_t address) +{ + VirtIODevice *vdev =3D &viommu->parent_obj; + VirtQueue *vq =3D viommu->event_vq; + struct virtio_iommu_fault fault; + VirtQueueElement *elem; + size_t sz; + + memset(&fault, 0, sizeof(fault)); + fault.reason =3D reason; + fault.flags =3D cpu_to_le32(flags); + fault.endpoint =3D cpu_to_le32(endpoint); + fault.address =3D cpu_to_le64(address); + + elem =3D virtqueue_pop(vq, sizeof(VirtQueueElement)); + + if (!elem) { + error_report_once( + "no buffer available in event queue to report event"); + return; + } + + if (iov_size(elem->in_sg, elem->in_num) < sizeof(fault)) { + virtio_error(vdev, "error buffer of wrong size"); + virtqueue_detach_element(vq, elem, 0); + g_free(elem); + return; + } + + sz =3D iov_from_buf(elem->in_sg, elem->in_num, 0, + &fault, sizeof(fault)); + assert(sz =3D=3D sizeof(fault)); + + trace_virtio_iommu_report_fault(reason, flags, endpoint, address); + virtqueue_push(vq, elem, sz); + virtio_notify(vdev, vq); + g_free(elem); + +} + static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr = addr, IOMMUAccessFlags flag, int iommu_idx) @@ -476,9 +518,10 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemor= yRegion *mr, hwaddr addr, VirtIOIOMMUInterval interval, *mapping_key; VirtIOIOMMUMapping *mapping_value; VirtIOIOMMU *s =3D sdev->viommu; + bool read_fault, write_fault; VirtIOIOMMUEndpoint *ep; + uint32_t sid, flags; bool bypass_allowed; - uint32_t sid; bool found; =20 interval.low =3D addr; @@ -504,6 +547,9 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemory= Region *mr, hwaddr addr, if (!ep) { if (!bypass_allowed) { error_report_once("%s sid=3D%d is not known!!", __func__, sid)= ; + virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_UNKNOWN, + VIRTIO_IOMMU_FAULT_F_ADDRESS, + sid, addr); } else { entry.perm =3D flag; } @@ -515,6 +561,9 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemory= Region *mr, hwaddr addr, error_report_once("%s %02x:%02x.%01x not attached to any domai= n", __func__, PCI_BUS_NUM(sid), PCI_SLOT(sid), PCI_FUNC(sid)); + virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_DOMAIN, + VIRTIO_IOMMU_FAULT_F_ADDRESS, + sid, addr); } else { entry.perm =3D flag; } @@ -527,15 +576,26 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemo= ryRegion *mr, hwaddr addr, if (!found) { error_report_once("%s no mapping for 0x%"PRIx64" for sid=3D%d", __func__, addr, sid); + virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_MAPPING, + VIRTIO_IOMMU_FAULT_F_ADDRESS, + sid, addr); goto unlock; } =20 - if (((flag & IOMMU_RO) && - !(mapping_value->flags & VIRTIO_IOMMU_MAP_F_READ)) || - ((flag & IOMMU_WO) && - !(mapping_value->flags & VIRTIO_IOMMU_MAP_F_WRITE))) { + read_fault =3D (flag & IOMMU_RO) && + !(mapping_value->flags & VIRTIO_IOMMU_MAP_F_READ); + write_fault =3D (flag & IOMMU_WO) && + !(mapping_value->flags & VIRTIO_IOMMU_MAP_F_WRITE); + + flags =3D read_fault ? VIRTIO_IOMMU_FAULT_F_READ : 0; + flags |=3D write_fault ? VIRTIO_IOMMU_FAULT_F_WRITE : 0; + if (flags) { error_report_once("%s permission error on 0x%"PRIx64"(%d): allowed= =3D%d", __func__, addr, flag, mapping_value->flags); + flags |=3D VIRTIO_IOMMU_FAULT_F_ADDRESS; + virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_MAPPING, + flags | VIRTIO_IOMMU_FAULT_F_ADDRESS, + sid, addr); goto unlock; } entry.translated_addr =3D addr - mapping_key->low + mapping_value->phy= s_addr; diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events index 095aa8b509..e83500bee9 100644 --- a/hw/virtio/trace-events +++ b/hw/virtio/trace-events @@ -72,3 +72,4 @@ virtio_iommu_put_endpoint(uint32_t ep_id) "Free endpoint= =3D%d" virtio_iommu_get_domain(uint32_t domain_id) "Alloc domain=3D%d" virtio_iommu_put_domain(uint32_t domain_id) "Free domain=3D%d" virtio_iommu_translate_out(uint64_t virt_addr, uint64_t phys_addr, uint32_= t sid) "0x%"PRIx64" -> 0x%"PRIx64 " for sid=3D%d" +virtio_iommu_report_fault(uint8_t reason, uint32_t flags, uint32_t endpoin= t, uint64_t addr) "FAULT reason=3D%d flags=3D%d endpoint=3D%d address =3D0x= %"PRIx64 --=20 MST