From: "Michael S. Tsirkin" <mst@redhat.com>
To: Eric Auger <eric.auger@redhat.com>
Cc: jean-philippe@linaro.org, kevin.tian@intel.com,
peter.maydell@linaro.org, tn@semihalf.com, qemu-devel@nongnu.org,
peterx@redhat.com, alex.williamson@redhat.com,
qemu-arm@nongnu.org, bharat.bhushan@nxp.com,
eric.auger.pro@gmail.com
Subject: Re: [Qemu-devel] [PATCH for-4.2 v10 13/15] virtio_iommu: Handle reserved regions in translation process
Date: Sun, 1 Sep 2019 02:38:01 -0400 [thread overview]
Message-ID: <20190901023751-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <20190730172137.23114-14-eric.auger@redhat.com>
On Tue, Jul 30, 2019 at 07:21:35PM +0200, Eric Auger wrote:
> When translating an address we need to check if it belongs to
> a reserved virtual address range. If it does, there are 2 cases:
>
> - it belongs to a RESERVED region: the guest should neither use
> this address in a MAP not instruct the end-point to DMA on
> them. We report an error
>
> - It belongs to an MSI region: we bypass the translation.
>
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
something wrong with the subject here.
> ---
>
> v9 -> v10:
> - in case of MSI region, we immediatly return
> ---
> hw/virtio/virtio-iommu.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
> index 8e54a17227..20d92b7ab0 100644
> --- a/hw/virtio/virtio-iommu.c
> +++ b/hw/virtio/virtio-iommu.c
> @@ -711,6 +711,7 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr,
> viommu_interval interval;
> bool bypass_allowed;
> bool read_fault, write_fault;
> + struct virtio_iommu_probe_resv_mem *reg;
>
> interval.low = addr;
> interval.high = addr + 1;
> @@ -743,6 +744,21 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr,
> goto unlock;
> }
>
> + reg = g_tree_lookup(ep->reserved_regions, (gpointer)(&interval));
> + if (reg) {
> + switch (reg->subtype) {
> + case VIRTIO_IOMMU_RESV_MEM_T_MSI:
> + entry.perm = flag;
> + return entry;
> + case VIRTIO_IOMMU_RESV_MEM_T_RESERVED:
> + default:
> + virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_MAPPING,
> + 0, sid, addr);
> + break;
> + }
> + goto unlock;
> + }
> +
> if (!ep->domain) {
> if (!bypass_allowed) {
> qemu_log_mask(LOG_GUEST_ERROR,
> --
> 2.20.1
next prev parent reply other threads:[~2019-09-01 6:39 UTC|newest]
Thread overview: 55+ 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
2019-11-04 18:31 ` Jean-Philippe Brucker
2019-11-25 13:14 ` Auger Eric
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
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 [this message]
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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