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From: Julien Grall <julien.grall@linaro.org>
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>,
	JBeulich@suse.com
Subject: Re: [PATCH v10 0/8] xen/arm: introduce GNTTABOP_cache_flush
Date: Wed, 22 Oct 2014 13:40:13 +0100	[thread overview]
Message-ID: <5447A5AD.70608@linaro.org> (raw)
In-Reply-To: <alpine.DEB.2.02.1410211906230.876@kaball.uk.xensource.com>

Hi Stefano,

On 10/21/2014 07:10 PM, 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.
> 
> It also removes XENFEAT_grant_map_identity as the feature is no longer
> necessary: it was used to achieve the same goal but the guest can now
> use the hypercall instead. Keeping the flag would also have a
> significant performance impact as a new p2m mapping gets created and
> then destroyed for every grant that is mapped and unmapped in dom0.

I don't remembered if I asked before. Do you plan to write somewhere
(wiki page, release note...) that some version of Linux (IIRC Linux 3.16
and 3.17) are broken when running as DOM0?

Regards,

-- 
Julien Grall

  parent reply	other threads:[~2014-10-22 12:40 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-21 18:10 [PATCH v10 0/8] xen/arm: introduce GNTTABOP_cache_flush Stefano Stabellini
2014-10-21 18:10 ` [PATCH v10 1/8] xen: introduce gnttab_max_frames and gnttab_max_maptrack_frames command line options Stefano Stabellini
2014-10-21 18:10 ` [PATCH v10 2/8] xen/arm: rename *_xen_dcache_* operations to *_dcache_* Stefano Stabellini
2014-10-21 18:10 ` [PATCH v10 3/8] xen/arm: return int from *_dcache_va_range Stefano Stabellini
2014-10-22 11:24   ` Ian Campbell
2014-10-22 11:45     ` Stefano Stabellini
2014-10-21 18:10 ` [PATCH v10 4/8] xen/arm: introduce invalidate_dcache_va_range Stefano Stabellini
2014-10-21 18:10 ` [PATCH v10 5/8] xen/x86: introduce more cache maintenance operations Stefano Stabellini
2014-10-21 18:10 ` [PATCH v10 6/8] xen/arm: introduce GNTTABOP_cache_flush Stefano Stabellini
2014-10-22 15:48   ` Jan Beulich
2014-10-21 18:10 ` [PATCH v10 7/8] Revert "xen/arm: introduce XENFEAT_grant_map_identity" Stefano Stabellini
2014-10-21 18:10 ` [PATCH v10 8/8] Revert "xen: introduce arch_grant_(un)map_page_identity" Stefano Stabellini
2014-10-22 12:40 ` Julien Grall [this message]
2014-10-22 13:09   ` [PATCH v10 0/8] xen/arm: introduce GNTTABOP_cache_flush Stefano Stabellini

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