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On 5/7/26 10:50, Ming Lei wrote:
...
>>> BTW, inspired by this approach, I adds similar feature to ublk via UBLK_IO_F_SHMEM_ZC
>>> which can maintain long-term vfio dma mapping over registered user-place aligned buffer.
>>
>> Interesting, just too a glance, and it looks like what David Wei
>> was thinking to add to fuse, but IIUC he gave up exactly because the
>> client will need to cooperate and that could be troublesome.
>
> Here the cooperation is minimized, maybe one shmem/hugetlb path, or memfd,
> and it is one optimization and opt-in, and fallback to normal path
> if application doesn't cooperate.
My point is that with widely enough adopted interface the user will be
able to opportunistically use it without knowledge about the file, i.e.
not knowing whether it's ublk or something else. But as you mentioned
below, it'd be cooperative interface in either case.
>> Should we try to push everything under the same interface instead of
>> keeping a ublk specific one? Again to the point that it requires
>
> If generic interface can be figured out, it shouldn't be a big deal for
> ublk to switch to it, and the usage is simple actually.
Sure, you'd just need to maintain both as there is a mismatch between
interfaces.
> So far, ublk supports both FS and nvme block device.
>
> And cooperation can't be avoided for this usage no matter if generic or
> driver specific implementation is taken, for both fuse & ublk.
--
Pavel Begunkov
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On 7/5/26 17:16, Alexey Kardashevskiy wrote:
> On 6/5/26 23:16, Jason Gunthorpe wrote:
>> On Wed, May 06, 2026 at 12:35:42PM +1000, Alexey Kardashevskiy wrote:
>>> Hi!
>>>
>>> Let's reignite this topic.
>>>
>>> I've been using these patches + QEMU side hacks for 6+ months. And it's been fine until I got a device where MSIX BAR is in a middle of another BAR marked as TEE in the TDISP interface report. And no trusted MSIX yet.
>>>
>>> Every time QEMU mmaps a BAR - I request a dmabuf fd from VFIO in QEMU. Since mapping of an entire MSIX BAR is allowed by default, VFIORegion::nr_mmaps==1 and it is an entire BAR.
>>>
>>> Problem: KVM memslot mismatches the dmabuf fd size
>>
>> Huh? kvm does not care about dmabuf at all? Are you running other
>> patches to hook kvm and dmabuf?
>
> yup, 06/12 of this patchset.
>
>> Putting a slice in a dmabuf is a well understood need for MSI, so I
>> expect whatever kvm dmabuf interface that gets merged to accomodate
>> this?
>
> good to know.
>
>>> Solution2: modify logic in VFIO dmabuf to allow multiple KVM memory
>>> slots per dmabuf. Now it is kvm_memory_slot::dmabuf_attach with no
>>> offset into the dmabuf and one kvm_vfio_dmabuf per dma_buf.
>>
>> Yes, when kvm learns to take in a dmabuf it needs to take in a slice,
>> not the whole buf. Or you need to create multiple dmabufs with the
>> necessary slices from the VFIO. The upstream vfio dmabuf creation
>> allows creating it with a slice.
>
> true but either way dmabuf slicing will be directed by QEMU's msix-table emulation MR and this slicing needs to match the TDISP report so I'll have to teach QEMU these reports, right?
Or TDISP devices are going to align MSIX BARs to 4K, and QEMU will do the same and it should "just work", and if it does not - the host won't crash. Can this work? Thanks,
> I am worried if I miss something obvious, again. Thanks,
>
>
> ps. I like nntp.lore.kernel.org very much for ability to dig out old stuff and then just reply to it :)
>
>>
>> Jason
>
--
Alexey
virtio_gpu_cursor_plane_update() calls virtio_gpu_array_lock_resv()
but ignores its return value. The function can fail in two ways:
- dma_resv_lock_interruptible() returns -ERESTARTSYS when a signal
is delivered while waiting for the reservation lock.
- dma_resv_reserve_fences() returns -ENOMEM if it fails to allocate
a fence slot; in this case lock_resv unlocks before returning.
In both cases the resv lock is not held on return. The cursor path
proceeds to queue a fenced transfer command. The queue path then
walks the object array and calls dma_resv_add_fence() on the cursor
BO's reservation. dma_resv_add_fence() requires the resv lock to be
held; with lockdep enabled the missing lock trips
dma_resv_assert_held():
WARNING: drivers/dma-buf/dma-resv.c:296 at dma_resv_add_fence+0x71e/0x840
Call Trace:
virtio_gpu_array_add_fence+0xcd/0x140
virtio_gpu_queue_ctrl_sgs
virtio_gpu_queue_fenced_ctrl_buffer+0x578/0xfb0
virtio_gpu_cursor_plane_update+0x411/0xbc0
drm_atomic_helper_commit_planes+0x497/0xf10
...
drm_mode_cursor_ioctl+0xd4/0x110
drm_ioctl+0x5e6/0xc60
__x64_sys_ioctl+0x18e/0x210
Beyond the WARN, mutating the dma_resv fence list without the lock
races with concurrent readers/writers and can corrupt the list.
Check the return value of virtio_gpu_array_lock_resv(). On failure,
drop the references taken by virtio_gpu_array_add_obj() with
virtio_gpu_array_put_free() (which does not unlock, matching the
not-locked state) and return without queueing the command. A
skipped cursor frame is harmless; the WARN and the underlying race
are not.
The bug was reported by syzbot, triggered via fault injection
(fail_nth) on the DRM_IOCTL_MODE_CURSOR path, which forces the
-ENOMEM branch in dma_resv_reserve_fences().
Reported-by: syzbot+72bd3dd3a5d5f39a0271(a)syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=72bd3dd3a5d5f39a0271
Fixes: 5cfd31c5b3a3 ("drm/virtio: fix virtio_gpu_cursor_plane_update().")
Cc: stable(a)vger.kernel.org
Signed-off-by: Deepanshu Kartikey <kartikey406(a)gmail.com>
---
drivers/gpu/drm/virtio/virtgpu_plane.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
index a126d1b25f46..ca379b08b9ec 100644
--- a/drivers/gpu/drm/virtio/virtgpu_plane.c
+++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
@@ -459,7 +459,10 @@ static void virtio_gpu_cursor_plane_update(struct drm_plane *plane,
if (!objs)
return;
virtio_gpu_array_add_obj(objs, vgfb->base.obj[0]);
- virtio_gpu_array_lock_resv(objs);
+ if (virtio_gpu_array_lock_resv(objs)) {
+ virtio_gpu_array_put_free(objs);
+ return;
+ }
virtio_gpu_cmd_transfer_to_host_2d
(vgdev, 0,
plane->state->crtc_w,
--
2.43.0
On Sat, May 09, 2026 at 01:31:56PM +0800, Xu Yilun wrote:
> > Would you be open to an in-between? The exporter and importer both
> > have information that should not leak into each other's drivers.
> >
> > What if the dmabuf mapping type core code was the only thing that had
> > access to *BOTH*? The exporter provides the address data, the importer
> > provides the iommu_domain. The core code, and only the core code, has
> > both and does the required operation?
>
> I think that may not work for KVM. On IOMMU side, IOMMUFD acts as the
> address space (iova) manager and dma_api/IOMMU driver acts as the
> actual page table mapper. But for KVM, it is both. KVM doesn't allow
> another component to provide an unknown address space (GPA space) and
> say "map it", so doesn't expose to other components about "KVM domain".
>
> Even if we expose "KVM domain", KVM still acts as the importer and the
> mapper, is it wierd to say we trust KVM-the-mapper, but don't trust
> KVM-the-as-manager?
>
> Is it also wierd that we trust IOMMU-the-mapper, but don't trust
> IOMMUFD-the-as-manager? There are more IOMMU drivers than IOMMUFD...
Yeah, it doesn't work well for kvm, and yes it is really weird and
worse that phys in every way..
Jason
On Thu, May 07, 2026 at 05:16:56PM +1000, Alexey Kardashevskiy wrote:
> true but either way dmabuf slicing will be directed by QEMU's
> msix-table emulation MR and this slicing needs to match the TDISP
> report so I'll have to teach QEMU these reports, right? I am worried
> if I miss something obvious, again. Thanks,
I don't think so.. It just needs to slice it into the MSI page
blindly. When the VM goes to validate the TDISP report against the
mappings it will fail to accept the device if there is a mismatch.
The only thing qemu could do is fail sooner, but I don't know that is
worth the complexity as we do expect all devices to have their MSI
range unprotected.
Jason
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