linux-kernel - Re: [PATCH 00/34] arch: barrier cleanup + __smp

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Date:	Wed, 30 Dec 2015 16:59:08 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	mst@...hat.com
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, arnd@...db.de,
	linux-arch@...r.kernel.org, andrew.cooper3@...rix.com,
	virtualization@...ts.linux-foundation.org,
	stefano.stabellini@...citrix.com
Subject: Re: [PATCH 00/34] arch: barrier cleanup + __smp_xxx barriers for
 virt

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

> On Wed, Dec 30, 2015 at 03:46:46PM -0500, David Miller wrote:
>> From: "Michael S. Tsirkin" <mst@...hat.com>
>> Date: Wed, 30 Dec 2015 14:58:19 +0200
>> 
>> > -. 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!
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