From: David Miller <davem@davemloft.net>
To: mst@redhat.com
Cc: linux-arch@vger.kernel.org, arnd@arndb.de,
stefano.stabellini@eu.citrix.com, peterz@infradead.org,
andrew.cooper3@citrix.com, linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org
Subject: Re: [PATCH 00/34] arch: barrier cleanup + __smp_xxx barriers for virt
Date: Wed, 30 Dec 2015 16:59:08 -0500 (EST) [thread overview]
Message-ID: <20151230.165908.1627575055770897057.davem@davemloft.net> (raw)
In-Reply-To: <20151230224855-mutt-send-email-mst@redhat.com>
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:
>> From: "Michael S. Tsirkin" <mst@redhat.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!
next prev parent reply other threads:[~2015-12-30 21:59 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-30 13:24 [PATCH 00/34] arch: barrier cleanup + __smp_XXX barriers for virt Michael S. Tsirkin
2015-12-30 13:24 ` [PATCH 01/34] Documentation/memory-barriers.txt: document __smb_mb() Michael S. Tsirkin
2015-12-30 13:24 ` [PATCH 02/34] asm-generic: guard smp_store_release/load_acquire Michael S. Tsirkin
2015-12-30 13:24 ` [PATCH 03/34] ia64: rename nop->iosapic_nop Michael S. Tsirkin
2015-12-30 13:24 ` [PATCH 04/34] ia64: reuse asm-generic/barrier.h Michael S. Tsirkin
2015-12-30 16:41 ` Luck, Tony
2015-12-30 13:24 ` [PATCH 05/34] powerpc: " Michael S. Tsirkin
2015-12-30 13:24 ` [PATCH 06/34] s390: " Michael S. Tsirkin
2015-12-30 13:24 ` [PATCH 07/34] sparc: " Michael S. Tsirkin
2015-12-30 13:24 ` [PATCH 08/34] asm-generic: smp_store_mb should use smp_mb Michael S. Tsirkin
2015-12-30 13:44 ` Arnd Bergmann
[not found] ` <5946017.BCmPrpGMuh@wuerfel>
2015-12-30 20:30 ` Michael S. Tsirkin
[not found] ` <20151230222703-mutt-send-email-mst@redhat.com>
2015-12-30 22:43 ` Arnd Bergmann
2015-12-30 13:24 ` [PATCH 09/34] arm: reuse asm-generic/barrier.h Michael S. Tsirkin
2015-12-30 13:24 ` [PATCH 10/34] arm64: " Michael S. Tsirkin
2015-12-30 13:25 ` [PATCH 11/34] metag: " Michael S. Tsirkin
2015-12-30 13:25 ` [PATCH 12/34] mips: " Michael S. Tsirkin
2015-12-30 13:25 ` [PATCH 13/34] x86/um: " Michael S. Tsirkin
2015-12-30 13:25 ` [PATCH 14/34] x86: " Michael S. Tsirkin
2015-12-30 13:25 ` [PATCH 15/34] asm-generic: add __smp_XXX wrappers Michael S. Tsirkin
2015-12-30 13:25 ` [PATCH 16/34] powerpc: define __smp_XXX Michael S. Tsirkin
2015-12-30 13:25 ` [PATCH 17/34] arm64: " Michael S. Tsirkin
2015-12-30 13:25 ` [PATCH 18/34] arm: " Michael S. Tsirkin
2015-12-30 13:25 ` [PATCH 19/34] blackfin: " Michael S. Tsirkin
2015-12-30 13:25 ` [PATCH 20/34] ia64: " Michael S. Tsirkin
2015-12-30 16:43 ` Luck, Tony
2015-12-30 13:25 ` [PATCH 21/34] metag: " Michael S. Tsirkin
2015-12-30 13:25 ` [PATCH 22/34] mips: " Michael S. Tsirkin
2015-12-30 13:25 ` [PATCH 23/34] s390: " Michael S. Tsirkin
2015-12-30 13:25 ` [PATCH 24/34] sh: define __smp_XXX, fix smp_store_mb for !SMP Michael S. Tsirkin
2015-12-30 13:26 ` [PATCH 25/34] sparc: define __smp_XXX Michael S. Tsirkin
2015-12-30 13:26 ` [PATCH 26/34] tile: " Michael S. Tsirkin
2015-12-30 13:26 ` [PATCH 27/34] xtensa: " Michael S. Tsirkin
2015-12-30 13:26 ` [PATCH 28/34] x86: " Michael S. Tsirkin
2015-12-30 13:26 ` [PATCH 29/34] Revert "virtio_ring: Update weak barriers to use dma_wmb/rmb" Michael S. Tsirkin
2015-12-30 13:26 ` [PATCH 30/34] virtio_ring: update weak barriers to use __smp_XXX Michael S. Tsirkin
2015-12-30 13:26 ` [PATCH 31/34] xenbus: use __smp_XXX barriers Michael S. Tsirkin
2015-12-30 13:26 ` [PATCH 32/34] xen/io: " Michael S. Tsirkin
2015-12-30 13:26 ` [PATCH 33/34] virtio: use __smp_load_acquire/__smp_store_release Michael S. Tsirkin
2015-12-30 13:26 ` [PATCH 34/34] virtio_ring: use __smp_store_mb Michael S. Tsirkin
2015-12-30 13:49 ` [PATCH 00/34] arch: barrier cleanup + __smp_XXX barriers for virt Arnd Bergmann
2015-12-30 21:45 ` [PATCH 00/34] arch: barrier cleanup + __smp_xxx " Michael S. Tsirkin
[not found] ` <20151230234521-mutt-send-email-mst@redhat.com>
2015-12-30 22:45 ` Arnd Bergmann
[not found] ` <1451473761-30019-4-git-send-email-mst@redhat.com>
2015-12-30 16:39 ` [PATCH 03/34] ia64: rename nop->iosapic_nop Luck, Tony
[not found] ` <1451473761-30019-8-git-send-email-mst@redhat.com>
2015-12-30 17:56 ` [PATCH 07/34] sparc: reuse asm-generic/barrier.h David Miller
[not found] ` <20151230.125603.75638711551088484.davem@davemloft.net>
2015-12-30 19:55 ` Michael S. Tsirkin
2015-12-30 20:47 ` David Miller
2015-12-30 20:46 ` [PATCH 00/34] arch: barrier cleanup + __smp_xxx barriers for virt David Miller
2015-12-30 21:36 ` Michael S. Tsirkin
[not found] ` <20151230224855-mutt-send-email-mst@redhat.com>
2015-12-30 21:59 ` David Miller [this message]
[not found] ` <1451473761-30019-2-git-send-email-mst@redhat.com>
2016-01-04 11:08 ` [PATCH 01/34] Documentation/memory-barriers.txt: document __smb_mb() Stefano Stabellini
[not found] ` <alpine.DEB.2.02.1601041104290.19710@kaball.uk.xensource.com>
2016-01-04 11:27 ` Michael S. Tsirkin
[not found] ` <1451473761-30019-32-git-send-email-mst@redhat.com>
2016-01-04 11:58 ` [PATCH 31/34] xenbus: use __smp_XXX barriers Stefano Stabellini
[not found] ` <1451473761-30019-33-git-send-email-mst@redhat.com>
2016-01-04 11:59 ` [PATCH 32/34] xen/io: " Stefano Stabellini
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