From: "Michael S. Tsirkin" <mst@redhat.com>
Date: Wed, 30 Dec 2015 23:36:29 +0200

On Wed, Dec 30, 2015 at 03:46:46PM -0500, David Miller wrote:

quoted

From: "Michael S. Tsirkin" <mst@redhat.com>
Date: Wed, 30 Dec 2015 14:58:19 +0200

quoted

-. Patch 1 documents the __smp APIs, and explains why they are
   useful for virt

If virt is doing things like interacting with descriptors that are
shared with a (potentially SMP) host, why don't we just annotate those
specific cases?

Using a bunch of per-arch ifdefs in virtio?
That's fundamentally what we have now.

I was suggesting a generic interface to get what you want.

virt_mb() or something like that.  You can name it something
else, that's not the important part.

Or do you mean wrappers for __smp_XXX that explicitly
say they are for talking to host?
E.g. pv_mb() pv_rmb() etc.
That sounds very reasonable to me.

Exactly!