linux/drivers/virtio/virtio_anchor.c
Juergen Gross a603002eea virtio: replace restricted mem access flag with callback
Instead of having a global flag to require restricted memory access
for all virtio devices, introduce a callback which can select that
requirement on a per-device basis.

For convenience add a common function returning always true, which can
be used for use cases like SEV.

Per default use a callback always returning false.

As the callback needs to be set in early init code already, add a
virtio anchor which is builtin in case virtio is enabled.

Signed-off-by: Juergen Gross <jgross@suse.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 guest using Xen
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Link: https://lore.kernel.org/r/20220622063838.8854-2-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
2022-08-01 07:42:49 +02:00

19 lines
464 B
C

// SPDX-License-Identifier: GPL-2.0-only
#include <linux/virtio.h>
#include <linux/virtio_anchor.h>
bool virtio_require_restricted_mem_acc(struct virtio_device *dev)
{
return true;
}
EXPORT_SYMBOL_GPL(virtio_require_restricted_mem_acc);
static bool virtio_no_restricted_mem_acc(struct virtio_device *dev)
{
return false;
}
bool (*virtio_check_mem_acc_cb)(struct virtio_device *dev) =
virtio_no_restricted_mem_acc;
EXPORT_SYMBOL_GPL(virtio_check_mem_acc_cb);