From: "Roger Pau Monné" <roger.pau@citrix.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: xen-devel@lists.xenproject.org, Tim Deegan <tim@xen.org>
Subject: Re: [PATCH 1/3] iommu: set correct IOMMU entries when iommu_hap_pt_share == 0
Date: Wed, 16 Apr 2014 16:36:18 +0200 [thread overview]
Message-ID: <534E9562.2060804@citrix.com> (raw)
In-Reply-To: <5343CFD4020000780000672B@nat28.tlf.novell.com>
On 08/04/14 10:30, Jan Beulich wrote:
>>>> On 07.04.14 at 18:02, <roger.pau@citrix.com> wrote:
>> If the memory map is not shared between HAP and IOMMU we fails to set
>> correct IOMMU mappings for memory types different than p2m_ram_rw.
>>
>> This patchs adds IOMMU support for the following memory types:
>> p2m_grant_map_rw, p2m_map_foreign, p2m_ram_ro and p2m_grant_map_ro.
>
> I'm curious about the justification for p2m_map_foreign; the others
> I agree with.
I've spoken with Stefano about this, because I've seen Qemu use foreign
mapped pages as arguments to systems calls like pread/pwrite, and I'm
quite sure we need IOMMU entries for foreign mappings. If Qemu opens the
disk file with O_DIRECT foreign mappings can end up in DMA requests.
Roger.
next prev parent reply other threads:[~2014-04-16 14:36 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-07 16:02 [PATCH 0/3] Fix grant map/unmap with auto-translated guests Roger Pau Monne
2014-04-07 16:02 ` [PATCH 1/3] iommu: set correct IOMMU entries when iommu_hap_pt_share == 0 Roger Pau Monne
2014-04-07 16:49 ` Konrad Rzeszutek Wilk
2014-04-08 8:30 ` Jan Beulich
2014-04-08 9:19 ` Roger Pau Monné
2014-04-08 9:55 ` Jan Beulich
2014-04-08 14:12 ` Tim Deegan
2014-04-08 15:15 ` Roger Pau Monné
2014-04-08 15:29 ` Jan Beulich
2014-04-13 20:27 ` Tim Deegan
2014-04-16 14:36 ` Roger Pau Monné [this message]
2014-04-16 14:41 ` Jan Beulich
2014-04-07 16:02 ` [PATCH 2/3] amd-iommu: disable iommu_hap_pt_share with AMD IOMMUs Roger Pau Monne
2014-04-07 16:51 ` Konrad Rzeszutek Wilk
2014-04-07 16:54 ` George Dunlap
2014-04-08 7:29 ` Roger Pau Monné
2014-04-08 8:52 ` Jan Beulich
2014-04-08 14:16 ` Tim Deegan
2014-04-08 14:36 ` Jan Beulich
2014-04-08 15:39 ` Roger Pau Monné
2014-04-07 16:02 ` [PATCH 3/3] xen: expose that grant table mappings update the IOMMU Roger Pau Monne
2014-04-08 8:34 ` Ian Campbell
2014-04-08 8:56 ` Jan Beulich
2014-04-08 8:58 ` Ian Campbell
2014-04-08 9:53 ` Jan Beulich
2014-04-08 9:57 ` Ian Campbell
2014-04-08 10:05 ` Jan Beulich
2014-04-08 10:26 ` Ian Campbell
2014-04-08 10:31 ` Jan Beulich
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