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[PULL 05/34] virtio-iommu: Implement RESV_MEM probe request
From: |
Peter Maydell |
Subject: |
[PULL 05/34] virtio-iommu: Implement RESV_MEM probe request |
Date: |
Fri, 3 Jul 2020 17:53:36 +0100 |
From: Eric Auger <eric.auger@redhat.com>
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 <eric.auger@redhat.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 20200629070404.10969-3-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
include/hw/virtio/virtio-iommu.h | 2 +
hw/virtio/virtio-iommu.c | 94 ++++++++++++++++++++++++++++++--
hw/virtio/trace-events | 1 +
3 files changed, 93 insertions(+), 4 deletions(-)
diff --git a/include/hw/virtio/virtio-iommu.h b/include/hw/virtio/virtio-iommu.h
index e653004d7ca..49eb105cd84 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 483883ec1d9..2cdaa1969bb 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 +379,65 @@ 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++) {
+ unsigned subtype = s->reserved_regions[i].type;
+
+ assert(subtype == VIRTIO_IOMMU_RESV_MEM_T_RESERVED ||
+ subtype == VIRTIO_IOMMU_RESV_MEM_T_MSI);
+ prop.head.type = cpu_to_le16(VIRTIO_IOMMU_PROBE_T_RESV_MEM);
+ prop.head.length = cpu_to_le16(length);
+ prop.subtype = subtype;
+ 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
+ */
+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;
+
+ 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 +467,27 @@ 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 +524,17 @@ 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 +542,13 @@ 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 +751,7 @@ 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 +761,7 @@ 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 6427a0047df..23109f69bbf 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
- [PULL 00/34] target-arm queue, Peter Maydell, 2020/07/03
- [PULL 01/34] Add a phy-num property to the i.MX FEC emulator, Peter Maydell, 2020/07/03
- [PULL 03/34] Select MDIO device 2 and 1 as PHY devices for i.MX6UL EVK board., Peter Maydell, 2020/07/03
- [PULL 02/34] Add the ability to select a different PHY for each i.MX6UL FEC interface, Peter Maydell, 2020/07/03
- [PULL 04/34] qdev: Introduce DEFINE_PROP_RESERVED_REGION, Peter Maydell, 2020/07/03
- [PULL 05/34] virtio-iommu: Implement RESV_MEM probe request,
Peter Maydell <=
- [PULL 06/34] virtio-iommu: Handle reserved regions in the translation process, Peter Maydell, 2020/07/03
- [PULL 08/34] hw/arm/virt: Let the virtio-iommu bypass MSIs, Peter Maydell, 2020/07/03
- [PULL 07/34] virtio-iommu-pci: Add array of Interval properties, Peter Maydell, 2020/07/03
- [PULL 09/34] target/arm: kvm: Handle DABT with no valid ISS, Peter Maydell, 2020/07/03
- [PULL 10/34] target/arm: kvm: Handle misconfigured dabt injection, Peter Maydell, 2020/07/03
- [PULL 12/34] tests/acpi: virt: allow DSDT acpi table changes, Peter Maydell, 2020/07/03
- [PULL 13/34] hw/arm/virt-acpi-build: Only expose flash on older machine types, Peter Maydell, 2020/07/03
- [PULL 11/34] tests/acpi: remove stale allowed tables, Peter Maydell, 2020/07/03