linux-kernel - Re: [RFC] virtio: use mandatory barriers for remote processor vdevs

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Message-ID: <20111201090920.GA8231@redhat.com>
Date:	Thu, 1 Dec 2011 11:09:21 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Ohad Ben-Cohen <ohad@...ery.com>, dhowells@...hat.com,
	paulmck@...ux.vnet.ibm.com
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [RFC] virtio: use mandatory barriers for remote processor vdevs

On Thu, Dec 01, 2011 at 08:14:26AM +0200, Ohad Ben-Cohen wrote:
> On Thu, Dec 1, 2011 at 1:13 AM, Michael S. Tsirkin <mst@...hat.com> wrote:
> > For x86, stores into memory are ordered. So I think that yes, smp_XXX
> > can be selected at compile time.
> 
> But then you can't use the same kernel image for both scenarios.

I was talking about virtio-pci. That always allocates the ring
in the normal memory.

> It won't take long until people will use virtio on ARM for both
> virtualization and for talking to devices, and having to rebuild the
> kernel for different use cases is nasty.

Yes, I understand that it's nasty.

> _______________________________________________
> Virtualization mailing list
> Virtualization@...ts.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/virtualization
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