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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180806161040.GA4675@infradead.org>
Date:   Mon, 6 Aug 2018 09:10:40 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        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 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.