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Thu, 18 Jun 2020 09:04:55 +0000 (UTC) Subject: Re: [PATCH v3 2/5] virtio-iommu: Implement RESV_MEM probe request To: Jean-Philippe Brucker References: <20200611151209.22547-1-eric.auger@redhat.com> <20200611151209.22547-3-eric.auger@redhat.com> <20200617091613.GA871763@myrica> From: Auger Eric Message-ID: <3dfa575c-2c65-a405-4548-b33d13dce353@redhat.com> Date: Thu, 18 Jun 2020 11:04:54 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20200617091613.GA871763@myrica> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 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-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=207.211.31.120; envelope-from=eric.auger@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/18 01:47:12 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: peter.maydell@linaro.org, mst@redhat.com, qemu-devel@nongnu.org, peterx@redhat.com, armbru@redhat.com, qemu-arm@nongnu.org, pbonzini@redhat.com, bbhushan2@marvell.com, eric.auger.pro@gmail.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi Jean-Philippe, On 6/17/20 11:16 AM, Jean-Philippe Brucker wrote: > On Thu, Jun 11, 2020 at 05:12:06PM +0200, Eric Auger wrote: >> This patch implements the PROBE request. At the moment, >> only THE RESV_MEM property is handled. The first goal is >> to report iommu wide reserved regions such as the MSI regions >> set by the machine code. On x86 this will be the IOAPIC MSI >> region, [0xFEE00000 - 0xFEEFFFFF], on ARM this may be the ITS >> doorbell. >> >> In the future we may introduce per device reserved regions. >> This will be useful when protecting host assigned devices >> which may expose their own reserved regions >> >> Signed-off-by: Eric Auger > > Looks good to me apart from one comment inconsistency (below) noted > > Reviewed-by: Jean-Philippe Brucker Thanks! Eric > >> >> --- >> >> v2 -> v3: >> - on probe, do not fill the reminder of the buffer with zeroes >> as the buffer was already zero initialized (Bharat) >> >> v1 -> v2: >> - move the unlock back to the same place >> - remove the push label and factorize the code after the out label >> - fix a bunch of cpu_to_leX according to the latest spec revision >> - do not remove sizeof(last) from free space >> - check the ep exists >> --- >> include/hw/virtio/virtio-iommu.h | 2 + >> hw/virtio/virtio-iommu.c | 91 ++++++++++++++++++++++++++++++-- >> hw/virtio/trace-events | 1 + >> 3 files changed, 90 insertions(+), 4 deletions(-) >> >> diff --git a/include/hw/virtio/virtio-iommu.h b/include/hw/virtio/virtio-iommu.h >> index e653004d7c..49eb105cd8 100644 >> --- a/include/hw/virtio/virtio-iommu.h >> +++ b/include/hw/virtio/virtio-iommu.h >> @@ -53,6 +53,8 @@ typedef struct VirtIOIOMMU { >> GHashTable *as_by_busptr; >> IOMMUPciBus *iommu_pcibus_by_bus_num[PCI_BUS_MAX]; >> PCIBus *primary_bus; >> + ReservedRegion *reserved_regions; >> + uint32_t nb_reserved_regions; >> GTree *domains; >> QemuMutex mutex; >> GTree *endpoints; >> diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c >> index 483883ec1d..be1527c1d6 100644 >> --- a/hw/virtio/virtio-iommu.c >> +++ b/hw/virtio/virtio-iommu.c >> @@ -38,6 +38,7 @@ >> >> /* Max size */ >> #define VIOMMU_DEFAULT_QUEUE_SIZE 256 >> +#define VIOMMU_PROBE_SIZE 512 >> >> typedef struct VirtIOIOMMUDomain { >> uint32_t id; >> @@ -378,6 +379,62 @@ static int virtio_iommu_unmap(VirtIOIOMMU *s, >> return ret; >> } >> >> +static ssize_t virtio_iommu_fill_resv_mem_prop(VirtIOIOMMU *s, uint32_t ep, >> + uint8_t *buf, size_t free) >> +{ >> + struct virtio_iommu_probe_resv_mem prop = {}; >> + size_t size = sizeof(prop), length = size - sizeof(prop.head), total; >> + int i; >> + >> + total = size * s->nb_reserved_regions; >> + >> + if (total > free) { >> + return -ENOSPC; >> + } >> + >> + for (i = 0; i < s->nb_reserved_regions; i++) { >> + prop.head.type = cpu_to_le16(VIRTIO_IOMMU_PROBE_T_RESV_MEM); >> + prop.head.length = cpu_to_le16(length); >> + prop.subtype = s->reserved_regions[i].type; >> + prop.start = cpu_to_le64(s->reserved_regions[i].low); >> + prop.end = cpu_to_le64(s->reserved_regions[i].high); >> + >> + memcpy(buf, &prop, size); >> + >> + trace_virtio_iommu_fill_resv_property(ep, prop.subtype, >> + prop.start, prop.end); >> + buf += size; >> + } >> + return total; >> +} >> + >> +/** >> + * virtio_iommu_probe - Fill the probe request buffer with >> + * the properties the device is able to return and add a NONE >> + * property at the end. > > The NONE property doesn't exist anymore > >> + */ >> +static int virtio_iommu_probe(VirtIOIOMMU *s, >> + struct virtio_iommu_req_probe *req, >> + uint8_t *buf) >> +{ >> + uint32_t ep_id = le32_to_cpu(req->endpoint); >> + size_t free = VIOMMU_PROBE_SIZE; >> + ssize_t count; >> + >> + if (!virtio_iommu_mr(s, ep_id)) { >> + return VIRTIO_IOMMU_S_NOENT; >> + } >> + >> + count = virtio_iommu_fill_resv_mem_prop(s, ep_id, buf, free); >> + if (count < 0) { >> + return VIRTIO_IOMMU_S_INVAL; >> + } >> + buf += count; >> + free -= count; > > Nit: could be removed since we only support one property at the moment. > >> + >> + return VIRTIO_IOMMU_S_OK; >> +} >> + >> static int virtio_iommu_iov_to_req(struct iovec *iov, >> unsigned int iov_cnt, >> void *req, size_t req_sz) >> @@ -407,15 +464,27 @@ virtio_iommu_handle_req(detach) >> virtio_iommu_handle_req(map) >> virtio_iommu_handle_req(unmap) >> >> +static int virtio_iommu_handle_probe(VirtIOIOMMU *s, >> + struct iovec *iov, >> + unsigned int iov_cnt, >> + uint8_t *buf) >> +{ >> + struct virtio_iommu_req_probe req; >> + int ret = virtio_iommu_iov_to_req(iov, iov_cnt, &req, sizeof(req)); >> + >> + return ret ? ret : virtio_iommu_probe(s, &req, buf); >> +} >> + >> static void virtio_iommu_handle_command(VirtIODevice *vdev, VirtQueue *vq) >> { >> VirtIOIOMMU *s = VIRTIO_IOMMU(vdev); >> struct virtio_iommu_req_head head; >> struct virtio_iommu_req_tail tail = {}; >> + size_t output_size = sizeof(tail), sz; >> VirtQueueElement *elem; >> unsigned int iov_cnt; >> struct iovec *iov; >> - size_t sz; >> + void *buf = NULL; >> >> for (;;) { >> elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); >> @@ -452,6 +521,17 @@ static void virtio_iommu_handle_command(VirtIODevice *vdev, VirtQueue *vq) >> case VIRTIO_IOMMU_T_UNMAP: >> tail.status = virtio_iommu_handle_unmap(s, iov, iov_cnt); >> break; >> + case VIRTIO_IOMMU_T_PROBE: >> + { >> + struct virtio_iommu_req_tail *ptail; >> + >> + output_size = s->config.probe_size + sizeof(tail); >> + buf = g_malloc0(output_size); >> + >> + ptail = (struct virtio_iommu_req_tail *) >> + (buf + s->config.probe_size); >> + ptail->status = virtio_iommu_handle_probe(s, iov, iov_cnt, buf); >> + } >> default: >> tail.status = VIRTIO_IOMMU_S_UNSUPP; >> } >> @@ -459,12 +539,13 @@ static void virtio_iommu_handle_command(VirtIODevice *vdev, VirtQueue *vq) >> >> out: >> sz = iov_from_buf(elem->in_sg, elem->in_num, 0, >> - &tail, sizeof(tail)); >> - assert(sz == sizeof(tail)); >> + buf ? buf : &tail, output_size); >> + assert(sz == output_size); >> >> - virtqueue_push(vq, elem, sizeof(tail)); >> + virtqueue_push(vq, elem, sz); >> virtio_notify(vdev, vq); >> g_free(elem); >> + g_free(buf); >> } >> } >> >> @@ -667,6 +748,7 @@ static void virtio_iommu_device_realize(DeviceState *dev, Error **errp) >> s->config.page_size_mask = TARGET_PAGE_MASK; >> s->config.input_range.end = -1UL; >> s->config.domain_range.end = 32; >> + s->config.probe_size = VIOMMU_PROBE_SIZE; >> >> virtio_add_feature(&s->features, VIRTIO_RING_F_EVENT_IDX); >> virtio_add_feature(&s->features, VIRTIO_RING_F_INDIRECT_DESC); >> @@ -676,6 +758,7 @@ static void virtio_iommu_device_realize(DeviceState *dev, Error **errp) >> virtio_add_feature(&s->features, VIRTIO_IOMMU_F_MAP_UNMAP); >> virtio_add_feature(&s->features, VIRTIO_IOMMU_F_BYPASS); >> virtio_add_feature(&s->features, VIRTIO_IOMMU_F_MMIO); >> + virtio_add_feature(&s->features, VIRTIO_IOMMU_F_PROBE); >> >> qemu_mutex_init(&s->mutex); >> >> diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events >> index 6427a0047d..23109f69bb 100644 >> --- a/hw/virtio/trace-events >> +++ b/hw/virtio/trace-events >> @@ -74,3 +74,4 @@ virtio_iommu_get_domain(uint32_t domain_id) "Alloc domain=%d" >> virtio_iommu_put_domain(uint32_t domain_id) "Free domain=%d" >> virtio_iommu_translate_out(uint64_t virt_addr, uint64_t phys_addr, uint32_t sid) "0x%"PRIx64" -> 0x%"PRIx64 " for sid=%d" >> virtio_iommu_report_fault(uint8_t reason, uint32_t flags, uint32_t endpoint, uint64_t addr) "FAULT reason=%d flags=%d endpoint=%d address =0x%"PRIx64 >> +virtio_iommu_fill_resv_property(uint32_t devid, uint8_t subtype, uint64_t start, uint64_t end) "dev= %d, type=%d start=0x%"PRIx64" end=0x%"PRIx64 >> -- >> 2.20.1 >> >