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From: Peter Xu <peterx@redhat.com>
To: Eric Auger <eric.auger@redhat.com>
Cc: peter.maydell@linaro.org, kevin.tian@intel.com, mst@redhat.com,
	tn@semihalf.com, qemu-devel@nongnu.org,
	alex.williamson@redhat.com, qemu-arm@nongnu.org,
	jean-philippe@linaro.org, bharat.bhushan@nxp.com,
	eric.auger.pro@gmail.com
Subject: Re: [Qemu-devel] [PATCH for-4.2 v10 09/15] virtio-iommu: Implement translate
Date: Mon, 19 Aug 2019 16:24:24 +0800
Message-ID: <20190819082424.GB13560@xz-x1> (raw)
In-Reply-To: <20190730172137.23114-10-eric.auger@redhat.com>

On Tue, Jul 30, 2019 at 07:21:31PM +0200, Eric Auger wrote:
> @@ -464,19 +464,75 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr,
>                                              int iommu_idx)
>  {
>      IOMMUDevice *sdev = container_of(mr, IOMMUDevice, iommu_mr);
> +    VirtIOIOMMU *s = sdev->viommu;
>      uint32_t sid;
> +    viommu_endpoint *ep;
> +    viommu_mapping *mapping;
> +    viommu_interval interval;
> +    bool bypass_allowed;
> +
> +    interval.low = addr;
> +    interval.high = addr + 1;
>  
>      IOMMUTLBEntry entry = {
>          .target_as = &address_space_memory,
>          .iova = addr,
>          .translated_addr = addr,
> -        .addr_mask = ~(hwaddr)0,
> +        .addr_mask = (1 << ctz32(s->config.page_size_mask)) - 1,
>          .perm = IOMMU_NONE,
>      };
>  
> +    bypass_allowed = virtio_has_feature(s->acked_features,
> +                                        VIRTIO_IOMMU_F_BYPASS);
> +
>      sid = virtio_iommu_get_sid(sdev);
>  
>      trace_virtio_iommu_translate(mr->parent_obj.name, sid, addr, flag);
> +    qemu_mutex_lock(&s->mutex);
> +
> +    ep = g_tree_lookup(s->endpoints, GUINT_TO_POINTER(sid));
> +    if (!ep) {
> +        if (!bypass_allowed) {
> +            error_report("%s sid=%d is not known!!", __func__, sid);

Maybe use error_report_once() to avoid DOS attack?  Also would it be
good to unify the debug prints?  I see both error_report() and
qemu_log_mask() are used in the whole patchset.  Or is that attempted?

> +        } else {
> +            entry.perm = flag;
> +        }
> +        goto unlock;
> +    }
> +
> +    if (!ep->domain) {
> +        if (!bypass_allowed) {
> +            qemu_log_mask(LOG_GUEST_ERROR,
> +                          "%s %02x:%02x.%01x not attached to any domain\n",
> +                          __func__, PCI_BUS_NUM(sid),
> +                          PCI_SLOT(sid), PCI_FUNC(sid));
> +        } else {
> +            entry.perm = flag;
> +        }
> +        goto unlock;
> +    }
> +
> +    mapping = g_tree_lookup(ep->domain->mappings, (gpointer)(&interval));
> +    if (!mapping) {
> +        qemu_log_mask(LOG_GUEST_ERROR,
> +                      "%s no mapping for 0x%"PRIx64" for sid=%d\n",
> +                      __func__, addr, sid);
> +        goto unlock;
> +    }
> +
> +    if (((flag & IOMMU_RO) && !(mapping->flags & VIRTIO_IOMMU_MAP_F_READ)) ||
> +        ((flag & IOMMU_WO) && !(mapping->flags & VIRTIO_IOMMU_MAP_F_WRITE))) {
> +        qemu_log_mask(LOG_GUEST_ERROR,
> +                      "Permission error on 0x%"PRIx64"(%d): allowed=%d\n",
> +                      addr, flag, mapping->flags);
> +        goto unlock;
> +    }
> +    entry.translated_addr = addr - mapping->virt_addr + mapping->phys_addr;
> +    entry.perm = flag;
> +    trace_virtio_iommu_translate_out(addr, entry.translated_addr, sid);
> +
> +unlock:
> +    qemu_mutex_unlock(&s->mutex);
>      return entry;
>  }
>  
> -- 
> 2.20.1
> 

Regards,

-- 
Peter Xu


  reply index

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-30 17:21 [Qemu-devel] [PATCH for-4.2 v10 00/15] VIRTIO-IOMMU device Eric Auger
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 01/15] update-linux-headers: Import virtio_iommu.h Eric Auger
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 02/15] linux-headers: update against 5.3-rc2 Eric Auger
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 03/15] virtio-iommu: Add skeleton Eric Auger
2019-08-15 13:54   ` Peter Xu
2019-08-29 12:18     ` Auger Eric
2019-08-30  1:26       ` Peter Xu
2019-08-30  8:12         ` Auger Eric
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 04/15] virtio-iommu: Decode the command payload Eric Auger
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 05/15] virtio-iommu: Add the iommu regions Eric Auger
2019-08-16  4:00   ` Peter Xu
2019-08-29 12:51     ` Auger Eric
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 06/15] virtio-iommu: Endpoint and domains structs and helpers Eric Auger
2019-08-16  4:17   ` Peter Xu
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 07/15] virtio-iommu: Implement attach/detach command Eric Auger
2019-08-16  4:27   ` Peter Xu
2019-08-29 14:24     ` Auger Eric
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 08/15] virtio-iommu: Implement map/unmap Eric Auger
2019-08-19  8:11   ` Peter Xu
2019-09-03 11:37     ` Auger Eric
2019-09-04  1:44       ` Peter Xu
2019-09-04  4:23         ` Tian, Kevin
2019-09-04  5:37           ` Peter Xu
2019-09-04  5:46             ` Tian, Kevin
2019-09-04  7:54               ` Auger Eric
2019-09-04  8:32                 ` Peter Xu
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 09/15] virtio-iommu: Implement translate Eric Auger
2019-08-19  8:24   ` Peter Xu [this message]
2019-09-03 11:45     ` Auger Eric
2019-09-04  1:58       ` Peter Xu
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 10/15] virtio-iommu: Implement probe request Eric Auger
2019-08-19 12:08   ` Peter Xu
2019-09-03 12:23     ` Auger Eric
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 11/15] virtio-iommu: Expose the IOAPIC MSI reserved region when relevant Eric Auger
2019-07-30 19:38   ` Michael S. Tsirkin
2019-07-30 23:20     ` Tian, Kevin
2019-07-31  9:05       ` Auger Eric
2019-07-31 19:25       ` Michael S. Tsirkin
2019-07-31 19:44         ` Auger Eric
2019-07-31 23:23           ` Tian, Kevin
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 12/15] virtio-iommu: Implement fault reporting Eric Auger
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 13/15] virtio_iommu: Handle reserved regions in translation process Eric Auger
2019-08-19 12:44   ` Peter Xu
2019-09-01  6:38   ` Michael S. Tsirkin
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 14/15] virtio-iommu-pci: Add virtio iommu pci support Eric Auger
2019-07-30 19:35   ` Michael S. Tsirkin
2019-08-01 12:15     ` Auger Eric
2019-08-01 13:06       ` Michael S. Tsirkin
2019-08-01 13:49         ` Auger Eric
2019-09-01  6:40           ` Michael S. Tsirkin
2019-09-04 14:19             ` Auger Eric
2019-09-04 21:36               ` Michael S. Tsirkin
2019-07-30 17:21 ` [Qemu-devel] [PATCH for-4.2 v10 15/15] hw/arm/virt: Add the virtio-iommu device tree mappings Eric Auger

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