r that reason, dropping
> the handle's reference must be done *after* we are done dereferencing
> the object.
>
> Signed-off-by: Rob Clark
Reviewed-by: Chia-I Wu
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h
#x27;(1 << ring_idx)' be a 64 bit type?
>
> Fixes: cd7f5ca33585 ("drm/virtio: implement context init: add
> virtio_gpu_fence_event")
> Signed-off-by: Dan Carpenter
> ---
> v2: Style change. Use BIT_ULL().
Reviewed-by: Chia-I Wu
>
> drivers/gpu/drm/virt
On Thu, Sep 15, 2022 at 4:14 AM Dan Carpenter wrote:
>
> The ->ring_idx_mask variable is a u64 so static checkers, Smatch in
> this case, complain if the BIT() is not also a u64.
>
> drivers/gpu/drm/virtio/virtgpu_ioctl.c:50 virtio_gpu_fence_event_create()
> warn: should '(1 << ring_idx)' be a 64
pported flag in
mode_config")
Suggested-by: Shao-Chuan Lee
Signed-off-by: Chia-I Wu
---
drivers/gpu/drm/virtio/virtgpu_display.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/virtio/virtgpu_display.c
b/drivers/gpu/drm/virtio/virtgpu_display.c
index 5c7f198c0712..9ea7611a9e0f
("drm/virtio: move virtio_gpu_mem_entry initialization to
> new function")
> Signed-off-by: Miaoqian Lin
> ---
> changes in v2:
> - Update Fixes tag.
> - rebase the working tree.
> v1 Link:
> https://lore.kernel.org/all/2021122207264
d-off-by: Rob Clark
Reviewed-by: Chia-I Wu
Might want to wait for Gurchetan to chime in as he added the mechanism.
> ---
> drivers/gpu/drm/virtio/virtgpu_ioctl.c | 8 +---
> include/uapi/drm/virtgpu_drm.h | 2 ++
> 2 files changed, 7 insertions(+), 3 deletions(-
b7a5e10962 ("virtio-gpu: add 3d/virgl support")
> Signed-off-by: Xiaomeng Tong
Reviewed-by: Chia-I Wu
> ---
> drivers/gpu/drm/virtio/virtgpu_ioctl.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
>
On Wed, Mar 23, 2022 at 4:01 AM Liu Zixian wrote:
> diff --git a/drivers/gpu/drm/virtio/virtgpu_display.c
> b/drivers/gpu/drm/virtio/virtgpu_display.c
> index 5b00310ac..f73352e7b 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_display.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_display.c
> @@ -179,6
On Fri, Feb 18, 2022 at 9:51 AM Rob Clark wrote:
>
> On Fri, Feb 18, 2022 at 8:42 AM Chia-I Wu wrote:
> >
> > On Fri, Feb 18, 2022 at 7:57 AM Rob Clark wrote:
> > >
> > > From: Rob Clark
> > >
> > > With native userspace drivers in guest
st VMM.
>
> Signed-off-by: Rob Clark
Reviewed-by: Chia-I Wu
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On Fri, Feb 18, 2022 at 7:57 AM Rob Clark wrote:
>
> From: Rob Clark
>
> With native userspace drivers in guest, a lot of GEM objects need to be
> neither shared nor mappable. And in fact making everything mappable
> and/or sharable results in unreasonably high fd usage in host VMM.
>
> Signed-o
virtgpu_object.c | 1 +
> include/drm/drm_gem_shmem_helper.h | 2 ++
> 6 files changed, 10 insertions(+), 3 deletions(-)
Reviewed-by: Chia-I Wu
>
> --
> 2.34.1
>
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gt; ---
> v2: I originally sent this patch on 19 Jun 2020 but it was somehow
> not applied. As I review it now, I see that the bug is actually
> older than I originally thought and so I have updated the Fixes
> tag.
Reviewed-by: Chia-I Wu
On Tue, Nov 2, 2021 at 6:07 AM Gerd Hoffmann wrote:
>
> On Tue, Nov 02, 2021 at 12:31:39PM +0100, Maksym Wezdecki wrote:
> > From: mwezdeck
> >
> > The idea behind the commit:
> > 1. not pin the pages during resource_create ioctl
> > 2. pin the pages on the first use during:
> > - trans
; extend the protocol while maintaining backward compatibility.
>
> > What do you think about that?
>
> I still think that switching to blob resources would be the better
> solution. Yes, it's alot of work and not something which helps
> short-term. But adding a new API
On Thu, Oct 21, 2021 at 4:52 AM Gerd Hoffmann wrote:
>
> On Thu, Oct 21, 2021 at 11:55:47AM +0200, Maksym Wezdecki wrote:
> > I get your point. However, we need to make resource_create ioctl,
> > in order to create corresponding resource on the host.
>
> That used to be the case but isn't true any
On Thu, Feb 13, 2020 at 5:22 AM Gerd Hoffmann wrote:
>
> Move virtio_gpu_notify() to higher-level functions for
> virtio_gpu_cmd_create_resource(), virtio_gpu_cmd_resource_create_3d()
> and virtio_gpu_cmd_resource_attach_backing().
>
> virtio_gpu_object_create() will batch commands and notify only
On Wed, Feb 12, 2020 at 3:13 AM Gerd Hoffmann wrote:
>
> Drop the virtio_gpu_{disable,enable}_notify(). Add a new
> virtio_gpu_notify() call instead, which must be called whenever
> the driver wants make sure the host is notified needed.
>
> Drop notification from command submission. Add virtio_
virtio_gpu_free_object(&shmem_obj->base);
> + return ret;
> + }
> +
> + ret = virtio_gpu_object_attach(vgdev, bo, ents, nents);
> if (ret != 0) {
> virtio_gpu_free_object(&shmem_obj->base);
>
bool has_virgl_3d;
> bool has_edid;
> + bool has_indirect;
has_indirect_desc? Either way,
Reviewed-by: Chia-I Wu
>
> struct work_struct config_changed_work;
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_debugfs.c
> b/drivers/gpu/drm/virtio/virtgp
On Thu, Feb 6, 2020 at 12:55 AM Gerd Hoffmann wrote:
>
> Hi,
>
> > > virtio_gpu_cmd_resource_attach_backing(vgdev, obj->hw_res_handle,
> > > - ents, nents,
> > > + obj->ents, obj->nents,
> > >
On Wed, Feb 5, 2020 at 10:43 PM Gerd Hoffmann wrote:
>
> > > -
> > > - drm_gem_shmem_free_object(obj);
> > > + if (bo->created) {
> > > + virtio_gpu_cmd_unref_resource(vgdev, bo);
> > > + /* completion handler calls virtio_gpu_cleanup_object() */
> > nitpick
}
>
> - if (vq->num_free < elemcnt) {
> + indirect = virtio_has_feature(vgdev->vdev,
> VIRTIO_RING_F_INDIRECT_DESC);
> + vqcnt = indirect ? 1 : elemcnt;
Is the feature dynamic and require the lock held? If not, the result
can be cached and the fixup can happen before grabbin
On Wed, Feb 5, 2020 at 2:26 AM Gerd Hoffmann wrote:
>
> Avoid flooding the log in case we screw up badly.
>
> Signed-off-by: Gerd Hoffmann
Reviewed-by: Chia-I Wu
> ---
> drivers/gpu/drm/virtio/virtgpu_vq.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
On Wed, Feb 5, 2020 at 3:00 AM Gerd Hoffmann wrote:
>
> Introduce new virtio_gpu_object_shmem_init() helper function which will
> create the virtio_gpu_mem_entry array, containing the backing storage
> information for the host. For the most path this just moves code from
> virtio_gpu_object_attac
On Wed, Feb 5, 2020 at 3:00 AM Gerd Hoffmann wrote:
>
> Add new virtio_gpu_cleanup_object() helper function for object cleanup.
> Wire up callback function for resource unref, do cleanup from callback
> when we know the host stopped using the resource.
>
> Signed-off-by: Gerd Hoffmann
> ---
> dr
;
> Thanks a lot! With this patch applied, my VM doesn't throw lockdep
> warnings anymore. If you want, you can add:
>
> Tested-by: Jann Horn
>
> > Reported-by: Jann Horn
> > Signed-off-by: Gerd Hoffmann
Reviewed-by: Chia-I Wu
> > ---
> > driver
On Wed, Dec 11, 2019 at 12:42 AM Gerd Hoffmann wrote:
>
> Signed-off-by: Gerd Hoffmann
> ---
> drivers/gpu/drm/virtio/virtgpu_plane.c | 41 +++---
> 1 file changed, 24 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c
> b/drivers/gpu/drm/
On Wed, Dec 11, 2019 at 12:42 AM Gerd Hoffmann wrote:
>
> Signed-off-by: Gerd Hoffmann
> ---
> drivers/gpu/drm/virtio/virtgpu_plane.c | 31 ++
> 1 file changed, 17 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c
> b/drivers/gpu/drm/
On Thu, Sep 12, 2019 at 4:46 AM Gerd Hoffmann wrote:
>
> Signed-off-by: Gerd Hoffmann
Reviewed-by: Chia-I Wu
> ---
> drivers/gpu/drm/virtio/virtgpu_drv.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c
> b/drivers/gpu/
On Thu, Sep 12, 2019 at 9:00 AM David Riley wrote:
>
> Fix warning introduced with commit e1218b8c0cc1
> ("drm/virtio: Use vmalloc for command buffer allocations.")
> from drm-misc-next.
>
> Signed-off-by: David Riley
Reviewed-by: Chia-I Wu
> ---
> drive
On Wed, Sep 4, 2019 at 10:23 PM Gerd Hoffmann wrote:
>
> On Wed, Sep 04, 2019 at 04:10:30PM -0700, Chia-I Wu wrote:
> > On Wed, Sep 4, 2019 at 12:48 AM Gerd Hoffmann wrote:
> > >
> > > Only call virtio_gpu_array_add_fence if we actually have a fence.
> > >
On Wed, Sep 4, 2019 at 12:48 AM Gerd Hoffmann wrote:
>
> Only call virtio_gpu_array_add_fence if we actually have a fence.
>
> Fixes: da758d51968a ("drm/virtio: rework virtio_gpu_execbuffer_ioctl fencing")
> Signed-off-by: Gerd Hoffmann
> ---
> drivers/gpu/drm/virtio/virtgpu_vq.c | 9 +
>
worker is also the one which will free up slots in the command
> queue.
>
> Reported-by: Chia-I Wu
> Signed-off-by: Gerd Hoffmann
Tested-by: Chia-I Wu
Reviewed-by: Chia-I Wu
> ---
> drivers/gpu/drm/virtio/virtgpu_drv.h | 8
> drive
On Fri, Aug 30, 2019 at 4:16 AM Gerd Hoffmann wrote:
>
> Hi,
>
> > > > - kfree(vbuf->data_buf);
> > > > + kvfree(vbuf->data_buf);
> > >
> > > if (is_vmalloc_addr(vbuf->data_buf)) ...
> > >
> > > needed here I gues?
> > >
> >
> > kvfree() handles vmalloc/kmalloc/kvmalloc internally by doi
On Thu, Aug 29, 2019 at 2:24 PM David Riley wrote:
>
> Userspace requested command buffer allocations could be too large
> to make as a contiguous allocation. Use vmalloc if necessary to
> satisfy those allocations.
>
> Signed-off-by: David Riley
> ---
> drivers/gpu/drm/virtio/virtgpu_ioctl.c |
per.
> v5: some small optimizations (Chia-I Wu).
> v4: make them virtio-private instead of generic helpers.
>
> Signed-off-by: Gerd Hoffmann
> ---
> drivers/gpu/drm/virtio/virtgpu_drv.h | 17 +
> drivers/gpu/drm/virtio/virtgpu_gem.c | 93
> 2 file
On Fri, Aug 23, 2019 at 2:55 AM Gerd Hoffmann wrote:
>
> Use drm_gem_reservation_object_wait() in virtio_gpu_wait_ioctl().
> This also makes the ioctl run lockless.
>
> v5: handle lookup failure.
> v2: use reservation_object_test_signaled_rcu for VIRTGPU_WAIT_NOWAIT.
>
> Signed-off-by: Gerd Hoffma
k. This avoids triggering a vmexit while holding the lock and
> thereby fixes a rather bad spinlock contention.
>
> Suggested-by: Chia-I Wu
> Signed-off-by: Gerd Hoffmann
Series is
Reviewed-by: Chia-I Wu
> ---
> drivers/gpu/drm/virtio/virtgpu_vq.c | 25 +++--
On Mon, Aug 26, 2019 at 10:21 PM Gerd Hoffmann wrote:
>
> On Mon, Aug 26, 2019 at 03:34:56PM -0700, Chia-I Wu wrote:
> > On Thu, Aug 22, 2019 at 2:47 AM Gerd Hoffmann wrote:
> > >
> > > Use drm_atomic_helper_check_plane_state()
> > > to sanity check the
On Thu, Aug 22, 2019 at 2:47 AM Gerd Hoffmann wrote:
>
> Use drm_atomic_helper_check_plane_state()
> to sanity check the plane state.
>
> Signed-off-by: Gerd Hoffmann
> ---
> drivers/gpu/drm/virtio/virtgpu_plane.c | 17 -
> 1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff
On Thu, Aug 22, 2019 at 3:26 AM Gerd Hoffmann wrote:
>
> Also update the comment with a reference to the virglrenderer fix.
>
> Signed-off-by: Gerd Hoffmann
Reviewed-by: Chia-I Wu
> ---
> drivers/gpu/drm/virtio/virtgpu_object.c | 44 ++---
> 1 file c
On Tue, Jul 2, 2019 at 7:19 AM Gerd Hoffmann wrote:
>
> virtio-gpu basically needs a sg_table for the bo, to tell the host where
> the backing pages for the object are. So the gem shmem helpers are a
> perfect fit. Some drm_gem_object_funcs need thin wrappers to update the
> host state, but othe
virtio_gpu_dequeue_ctrl_func. If virtqueue_notify was called with
the vq lock held, the worker thread would have to busy wait inside
virtio_gpu_dequeue_ctrl_func.
v2: fix scrambled commit message
Signed-off-by: Chia-I Wu
---
drivers/gpu/drm/virtio/virtgpu_vq.c | 19 +--
1 file changed, 13
On Thu, Jul 4, 2019 at 11:46 AM Chia-I Wu wrote:
>
> On Thu, Jul 4, 2019 at 4:25 AM Gerd Hoffmann wrote:
> >
> > Hi,
> >
> > > > if (fence)
> > > > virtio_gpu_fence_emit(vg
virtio_gpu_dequeue_ctrl_func. If virtqueue_notify was called with
the vq lock held, the worker thread would busy wait inside
virtio_gpu_dequeue_ctrl_func.
Signed-off-by: Chia-I Wu
---
drivers/gpu/drm/virtio/virtgpu_vq.c | 19 +--
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/drivers
On Fri, Jul 5, 2019 at 1:53 AM Gerd Hoffmann wrote:
>
> On Thu, Jul 04, 2019 at 12:17:48PM -0700, Chia-I Wu wrote:
> > On Thu, Jul 4, 2019 at 4:10 AM Gerd Hoffmann wrote:
> > >
> > > Hi,
> > >
> > > > > - r = ttm_bo_res
On Thu, Jul 4, 2019 at 4:10 AM Gerd Hoffmann wrote:
>
> Hi,
>
> > > - r = ttm_bo_reserve(&bo->tbo, true, false, NULL);
> > > + r = reservation_object_lock_interruptible(bo->gem_base.resv,
> > > NULL);
> > Can you elaborate a bit about how TTM keeps the BOs alive in, for
> > example,
On Thu, Jul 4, 2019 at 4:51 AM Gerd Hoffmann wrote:
>
> Hi,
>
> > > convert_to_hw_box(&box, &args->box);
> > > if (!vgdev->has_virgl_3d) {
> > > virtio_gpu_cmd_transfer_to_host_2d
> > > - (vgdev, qobj, offset,
> > > + (v
On Thu, Jul 4, 2019 at 4:48 AM Gerd Hoffmann wrote:
>
> On Wed, Jul 03, 2019 at 01:05:12PM -0700, Chia-I Wu wrote:
> > On Tue, Jul 2, 2019 at 7:19 AM Gerd Hoffmann wrote:
> > >
> > > Switch to the virtio_gpu_array_* helper workflow.
> > (just repeating my qu
On Thu, Jul 4, 2019 at 4:25 AM Gerd Hoffmann wrote:
>
> Hi,
>
> > > if (fence)
> > > virtio_gpu_fence_emit(vgdev, hdr, fence);
> > > + if (vbuf->objs) {
> > > + virtio_gpu_array_add_fence(vbuf->objs, &fence->f);
> > > + virtio_gpu_array_u
On Tue, Jul 2, 2019 at 7:19 AM Gerd Hoffmann wrote:
>
> Switch to the virtio_gpu_array_* helper workflow.
(just repeating my question on patch 6)
Does this fix the obj refcount issue? When was the issue introduced?
>
> Signed-off-by: Gerd Hoffmann
> ---
> drivers/gpu/drm/virtio/virtgpu_drv.h
On Tue, Jul 2, 2019 at 7:19 AM Gerd Hoffmann wrote:
>
> Switch to the virtio_gpu_array_* helper workflow.
>
> Signed-off-by: Gerd Hoffmann
> ---
> drivers/gpu/drm/virtio/virtgpu_drv.h | 2 +-
> drivers/gpu/drm/virtio/virtgpu_ioctl.c | 43 --
> drivers/gpu/drm/virtio/vi
On Wed, Jul 3, 2019 at 11:31 AM Chia-I Wu wrote:
>
> On Tue, Jul 2, 2019 at 7:19 AM Gerd Hoffmann wrote:
> >
> > Some helper functions to manage an array of gem objects.
> >
> > v6:
> > - add ticket to struct virtio_gpu_object_array.
> > - add v
On Tue, Jul 2, 2019 at 7:19 AM Gerd Hoffmann wrote:
>
> Rework fencing workflow, starting with virtio_gpu_execbuffer_ioctl.
> Stop using ttm helpers, use the virtio_gpu_array_* helpers (which work
> on the reservation objects directly) instead.
>
> New workflow:
>
> (1) All gem objects needed by
per.
> v5: some small optimizations (Chia-I Wu).
> v4: make them virtio-private instead of generic helpers.
>
> Signed-off-by: Gerd Hoffmann
> ---
> drivers/gpu/drm/virtio/virtgpu_drv.h | 17 ++
> drivers/gpu/drm/virtio/virtgpu_gem.c | 83
> 2 file
On Tue, Jul 2, 2019 at 7:19 AM Gerd Hoffmann wrote:
>
> Call reservation_object_* directly instead
> of using ttm_bo_{reserve,unreserve}.
>
> v4: check for EINTR only.
> v3: check for EINTR too.
>
> Signed-off-by: Gerd Hoffmann
> Reviewed-by: Daniel Vetter
> ---
> drivers/gpu/drm/virtio/virtgpu
On Fri, Jun 28, 2019 at 3:05 AM Gerd Hoffmann wrote:
>
> On Wed, Jun 26, 2019 at 04:55:20PM -0700, Chia-I Wu wrote:
> > On Wed, Jun 19, 2019 at 11:07 PM Gerd Hoffmann wrote:
> > >
> > > Use drm_gem_reservation_object_wait() in virtio_gpu_wait_ioctl().
> > >
On Fri, Jun 28, 2019 at 3:34 AM Gerd Hoffmann wrote:
>
> Hi,
>
> > > --- a/drivers/gpu/drm/virtio/virtgpu_drv.h
> > > +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
> > > @@ -120,9 +120,9 @@ struct virtio_gpu_vbuffer {
> > >
> > > char *resp_buf;
> > > int resp_size;
> > > -
> > >
On Fri, Jun 28, 2019 at 3:49 AM Gerd Hoffmann wrote:
>
> > > static inline struct virtio_gpu_object*
> > > virtio_gpu_object_ref(struct virtio_gpu_object *bo)
>
> > The last users of these two helpers are removed with this patch. We
> > can remove them.
>
> patch 12/12 does that.
I meant virtio
(pressed Send too early)
On Sun, Jun 30, 2019 at 11:20 AM Chia-I Wu wrote:
>
> On Fri, Jun 28, 2019 at 5:13 AM Gerd Hoffmann wrote:
> >
> > Use gem reservation helpers and direct reservation_object_* calls
> > instead of ttm.
> >
> > v5: fix fencing (Chia-I W
On Fri, Jun 28, 2019 at 5:13 AM Gerd Hoffmann wrote:
>
> Use gem reservation helpers and direct reservation_object_* calls
> instead of ttm.
>
> v5: fix fencing (Chia-I Wu).
> v3: Due to using the gem reservation object it is initialized and ready
> for use before calling t
On Fri, Jun 28, 2019 at 5:13 AM Gerd Hoffmann wrote:
>
> Use gem reservation helpers and direct reservation_object_* calls
> instead of ttm.
>
> v5: fix fencing (Chia-I Wu).
> v3: Also attach the array of gem objects to the virtio command buffer,
> so we can drop the obj
I tried my best to review this series. I am not really a kernel dev
so please take that with a grain of salt.
On Wed, Jun 19, 2019 at 11:01 PM Gerd Hoffmann wrote:
>
> Hi,
>
> > Also, I strongly recommend you do a very basic igt to exercise this, i.e.
> > allocate some buffers, submit them in
.
On Wed, Jun 19, 2019 at 11:08 PM Gerd Hoffmann wrote:
>
> virtio-gpu basically needs a sg_table for the bo, to tell the host where
> the backing pages for the object are. So the gem shmem helpers are a
> perfect fit. Some drm_gem_object_funcs need thin wrappers to update the
> host state, but
On Wed, Jun 19, 2019 at 11:07 PM Gerd Hoffmann wrote:
>
> Use gem reservation helpers and direct reservation_object_* calls
> instead of ttm.
>
> v3: Due to using the gem reservation object it is initialized and ready
> for use before calling ttm_bo_init, so we can also drop the tricky fence
> log
On Wed, Jun 19, 2019 at 11:08 PM Gerd Hoffmann wrote:
>
> Use gem reservation helpers and direct reservation_object_* calls
> instead of ttm.
>
> v3: Also attach the array of gem objects to the virtio command buffer,
> so we can drop the object references in the completion callback. Needed
> beca
On Wed, Jun 19, 2019 at 11:08 PM Gerd Hoffmann wrote:
>
> Some helper functions to manage an array of gem objects.
>
> v4: make them virtio-private instead of generic helpers.
>
> Signed-off-by: Gerd Hoffmann
> ---
> drivers/gpu/drm/virtio/virtgpu_drv.h | 10 ++
> drivers/gpu/drm/virtio/virt
On Wed, Jun 19, 2019 at 11:07 PM Gerd Hoffmann wrote:
>
> Use drm_gem_reservation_object_wait() in virtio_gpu_wait_ioctl().
> This also makes the ioctl run lockless.
The userspace has a BO cache to avoid freeing BOs immediately but to
reuse them on next allocations. The BO cache checks if a BO is
Suggested-by: Emil Velikov
Reviewed-by: Chia-I Wu
> ---
>
> This patch was suggested in this email thread:
>
> [PATCH] drm/virtio: allocate fences with GFP_KERNEL
> https://www.spinics.net/lists/dri-devel/msg208536.html
>
> drivers/gpu/drm/virtio/virtgpu_drv.h | 2 +-
> dri
On Wed, Apr 17, 2019 at 2:57 AM Gerd Hoffmann wrote:
>
> On Fri, Apr 12, 2019 at 04:34:20PM -0700, Chia-I Wu wrote:
> > Hi,
> >
> > I am still new to virgl, and missed the last round of discussion about
> > resource_create_v2.
> >
> > From the discuss
Hi,
I am still new to virgl, and missed the last round of discussion about
resource_create_v2.
>From the discussion below, semantically resource_create_v2 creates a host
resource object _without_ any storage; memory_create creates a host memory
object which provides the storage. Is that correct?
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