FROMGIT: drm/virtio: Remove restriction of non-zero blob_flags

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-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20220219170301.545432-1-robdclark@gmail.com


Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit ec3cbb30
 git://anongit.freedesktop.org/drm/drm-misc drm-misc-next)

BUG=b:176158390, b:203009046, b:230100768
TEST=gfxbench and deqp-cts in arcvm

Change-Id: I62c8634e0a74edc76bb60f91c324704d68fcb9ec
Disallow-Recycled-Builds: test-failures
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/3602856


Reviewed-by: Chia-I Wu <olv@google.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Ryan Neph <ryanneph@google.com>
Tested-by: Rob Clark <robdclark@chromium.org>
Auto-Submit: Rob Clark <robdclark@chromium.org>
Commit-Queue: Rob Clark <robdclark@chromium.org>