From: David Vrabel <david.vrabel@citrix.com>
To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
xen-devel@lists.xensource.com
Cc: Julien Grall <julien.grall@citrix.com>,
Ian Campbell <Ian.Campbell@citrix.com>
Subject: Re: [PATCH v3 0/5] xen/arm: introduce GNTTABOP_cache_flush
Date: Wed, 8 Oct 2014 16:42:37 +0100 [thread overview]
Message-ID: <54355B6D.2080005@citrix.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1410081353510.17038@kaball.uk.xensource.com>
On 08/10/14 13:58, Stefano Stabellini wrote:
> Hi all,
> this patch series introduces a new hypercall to perform cache
> maintenance operations on behalf of the guest. It is useful for dom0 to
> be able to cache flush pages involved in a dma operation with
> non-coherent devices.
I was going to suggest requiring the use of the SWIOTLB for all foreign
pages to non-coherent devices but Ian tells me you've already tried this
and it performs worse than this proposal. Is this the case?
Using the SWIOTLB would require no Xen changes (except for the revert)
which might be sensible at this point in the Xen 4.5 release cycle.
David
next prev parent reply other threads:[~2014-10-08 15:42 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-08 12:58 [PATCH v3 0/5] xen/arm: introduce GNTTABOP_cache_flush Stefano Stabellini
2014-10-08 13:00 ` [PATCH v3 1/5] xen: introduce two different max_nr_dom0/domU_grant_frames parameters Stefano Stabellini
2014-10-08 15:15 ` David Vrabel
2014-10-08 16:01 ` Stefano Stabellini
2014-10-08 16:42 ` David Vrabel
2014-10-08 16:59 ` Stefano Stabellini
2014-10-09 9:35 ` David Vrabel
2014-10-10 7:35 ` Jan Beulich
2014-10-10 9:19 ` David Vrabel
2014-10-10 7:37 ` Jan Beulich
2014-10-08 13:00 ` [PATCH v3 2/5] xen/arm: introduce invalidate_xen_dcache_va_range Stefano Stabellini
2014-10-08 13:00 ` [PATCH v3 3/5] xen/x86: introduce more cache maintenance operations Stefano Stabellini
2014-10-10 7:40 ` Jan Beulich
2014-10-10 9:23 ` Stefano Stabellini
2014-10-10 9:45 ` Jan Beulich
2014-10-08 13:00 ` [PATCH v3 4/5] xen/arm: introduce GNTTABOP_cache_flush Stefano Stabellini
2014-10-08 15:02 ` Andrew Cooper
2014-10-10 7:56 ` Jan Beulich
2014-10-08 13:00 ` [PATCH v3 5/5] Revert "xen/arm: introduce XENFEAT_grant_map_identity" Stefano Stabellini
2014-10-08 14:06 ` Julien Grall
2014-10-09 10:36 ` Stefano Stabellini
2014-10-08 15:42 ` David Vrabel [this message]
2014-10-09 10:22 ` [PATCH v3 0/5] xen/arm: introduce GNTTABOP_cache_flush Stefano Stabellini
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