linux-kernel - Re: [RFC 0/4] Virtio uses DMA API for all devices

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Message-ID: <20180806191111-mutt-send-email-mst@kernel.org>
Date:   Mon, 6 Aug 2018 19:13:32 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        robh@...nel.org, srikar@...ux.vnet.ibm.com, aik@...abs.ru,
        Jason Wang <jasowang@...hat.com>, linuxram@...ibm.com,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, paulus@...ba.org,
        joe@...ches.com, david@...son.dropbear.id.au,
        linuxppc-dev@...ts.ozlabs.org, elfring@...rs.sourceforge.net,
        haren@...ux.vnet.ibm.com
Subject: Re: [RFC 0/4] Virtio uses DMA API for all devices

On Mon, Aug 06, 2018 at 09:10:40AM -0700, Christoph Hellwig wrote:
> On Mon, Aug 06, 2018 at 07:06:05PM +0300, Michael S. Tsirkin wrote:
> > > I've done something very similar in the thread I posted a few years
> > > ago.
> > 
> > Right so that was before spectre where a virtual call was cheaper :(
> 
> Sorry, I meant days, not years.  The whole point of the thread was the
> slowdowns due to retpolines, which are the software spectre mitigation.

Oh that makes sense then. Could you post a pointer pls so
this patchset is rebased on top (there are things to
change about 4/4 but 1-3 could go in if they don't add
overhead)?

-- 
MST