From: Eric Auger <eric.auger@redhat.com>
To: eric.auger.pro@gmail.com, eric.auger@redhat.com,
qemu-devel@nongnu.org, qemu-arm@nongnu.org,
peter.maydell@linaro.org, jean-philippe@linaro.org,
dgilbert@redhat.com, quintela@redhat.com, mst@redhat.com,
peterx@redhat.com
Cc: kevin.tian@intel.com, bharatb.linux@gmail.com, tnowicki@marvell.com
Subject: [PATCH v15 6/9] virtio-iommu: Implement fault reporting
Date: Sat, 8 Feb 2020 13:00:19 +0100 [thread overview]
Message-ID: <20200208120022.1920-7-eric.auger@redhat.com> (raw)
In-Reply-To: <20200208120022.1920-1-eric.auger@redhat.com>
The event queue allows to report asynchronous errors.
The translate function now injects faults when relevant.
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
---
v13 -> v14:
- remove loop
- add Peter's R-b
v12 -> v13:
- return on virtio_error()
v11 -> v12:
- reporting the addr associated with the fault and set the
VIRTIO_IOMMU_FAULT_F_ADDRESS flag.
- added cpu_to_le<n>
v10 -> v11:
- change a virtio_error into an error_report_once
(no buffer available for output faults)
---
hw/virtio/trace-events | 1 +
hw/virtio/virtio-iommu.c | 70 +++++++++++++++++++++++++++++++++++++---
2 files changed, 66 insertions(+), 5 deletions(-)
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=%d"
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
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:
}
}
+static void virtio_iommu_report_fault(VirtIOIOMMU *viommu, uint8_t reason,
+ int flags, uint32_t endpoint,
+ uint64_t address)
+{
+ VirtIODevice *vdev = &viommu->parent_obj;
+ VirtQueue *vq = viommu->event_vq;
+ struct virtio_iommu_fault fault;
+ VirtQueueElement *elem;
+ size_t sz;
+
+ memset(&fault, 0, sizeof(fault));
+ fault.reason = reason;
+ fault.flags = cpu_to_le32(flags);
+ fault.endpoint = cpu_to_le32(endpoint);
+ fault.address = cpu_to_le64(address);
+
+ elem = 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 = iov_from_buf(elem->in_sg, elem->in_num, 0,
+ &fault, sizeof(fault));
+ assert(sz == 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(IOMMUMemoryRegion *mr, hwaddr addr,
VirtIOIOMMUInterval interval, *mapping_key;
VirtIOIOMMUMapping *mapping_value;
VirtIOIOMMU *s = sdev->viommu;
+ bool read_fault, write_fault;
VirtIOIOMMUEndpoint *ep;
+ uint32_t sid, flags;
bool bypass_allowed;
- uint32_t sid;
bool found;
interval.low = addr;
@@ -504,6 +547,9 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr,
if (!ep) {
if (!bypass_allowed) {
error_report_once("%s sid=%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 = flag;
}
@@ -515,6 +561,9 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr,
error_report_once("%s %02x:%02x.%01x not attached to any domain",
__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 = flag;
}
@@ -527,15 +576,26 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr,
if (!found) {
error_report_once("%s no mapping for 0x%"PRIx64" for sid=%d",
__func__, addr, sid);
+ virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_MAPPING,
+ VIRTIO_IOMMU_FAULT_F_ADDRESS,
+ sid, addr);
goto unlock;
}
- 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 = (flag & IOMMU_RO) &&
+ !(mapping_value->flags & VIRTIO_IOMMU_MAP_F_READ);
+ write_fault = (flag & IOMMU_WO) &&
+ !(mapping_value->flags & VIRTIO_IOMMU_MAP_F_WRITE);
+
+ flags = read_fault ? VIRTIO_IOMMU_FAULT_F_READ : 0;
+ flags |= write_fault ? VIRTIO_IOMMU_FAULT_F_WRITE : 0;
+ if (flags) {
error_report_once("%s permission error on 0x%"PRIx64"(%d): allowed=%d",
__func__, addr, flag, mapping_value->flags);
+ flags |= 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 = addr - mapping_key->low + mapping_value->phys_addr;
--
2.20.1
next prev parent reply other threads:[~2020-02-08 12:06 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-08 12:00 [PATCH v15 0/9] VIRTIO-IOMMU device Eric Auger
2020-02-08 12:00 ` [PATCH v15 1/9] virtio-iommu: Add skeleton Eric Auger
2020-02-08 12:00 ` [PATCH v15 2/9] virtio-iommu: Decode the command payload Eric Auger
2020-02-08 12:00 ` [PATCH v15 3/9] virtio-iommu: Implement attach/detach command Eric Auger
2020-02-08 13:41 ` Peter Xu
2020-02-08 14:00 ` Auger Eric
2020-02-08 12:00 ` [PATCH v15 4/9] virtio-iommu: Implement map/unmap Eric Auger
2020-02-08 12:00 ` [PATCH v15 5/9] virtio-iommu: Implement translate Eric Auger
2020-02-08 12:00 ` Eric Auger [this message]
2020-02-08 12:00 ` [PATCH v15 7/9] virtio-iommu-pci: Add virtio iommu pci support Eric Auger
2020-02-08 12:00 ` [PATCH v15 8/9] hw/arm/virt: Add the virtio-iommu device tree mappings Eric Auger
2020-02-11 15:00 ` Peter Maydell
2020-02-11 17:31 ` Auger Eric
2020-02-13 13:45 ` Auger Eric
2020-02-08 12:00 ` [PATCH v15 9/9] virtio-iommu: Support migration Eric Auger
2020-02-10 16:45 ` Juan Quintela
2020-02-11 13:56 ` [PATCH v15 0/9] VIRTIO-IOMMU device Michael S. Tsirkin
2020-02-11 15:02 ` Peter Maydell
2020-02-11 16:30 ` Michael S. Tsirkin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200208120022.1920-7-eric.auger@redhat.com \
--to=eric.auger@redhat.com \
--cc=bharatb.linux@gmail.com \
--cc=dgilbert@redhat.com \
--cc=eric.auger.pro@gmail.com \
--cc=jean-philippe@linaro.org \
--cc=kevin.tian@intel.com \
--cc=mst@redhat.com \
--cc=peter.maydell@linaro.org \
--cc=peterx@redhat.com \
--cc=qemu-arm@nongnu.org \
--cc=qemu-devel@nongnu.org \
--cc=quintela@redhat.com \
--cc=tnowicki@marvell.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).