From: Julien Grall <julien.grall@linaro.org>
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: xen-devel@lists.xenproject.org, tim@xen.org,
stefano.stabellini@citrix.com
Subject: Re: [PATCH v4 19/21] xen/arm: grant: Add another entry to map MFN 1:1 in dom0 p2m
Date: Mon, 28 Apr 2014 15:47:21 +0100 [thread overview]
Message-ID: <535E69F9.10404@linaro.org> (raw)
In-Reply-To: <1398694316.29700.128.camel@kazak.uk.xensource.com>
On 04/28/2014 03:11 PM, Ian Campbell wrote:
> On Tue, 2014-04-22 at 14:14 +0100, Julien Grall wrote:
>> Grant mapping can be used for DMA request. The dev_bus_addr returned by the
>> hypercall is the MFN (not the IPA). Currently Linux is using this address (via
>> swiotlb) to program the DMA.
>> When the device is protected by IOMMU the request will fail. We have to
>> add 1:1 mapping in the domain p2m to allow DMA request working.
>>
>> This is valid because DOM0 has its memory mapped 1:1.
> Go on to say:
>
> ... and therefore we know that RAM and devices cannot clash (or
> something).
Your sentence sounds good. I will update the commit message with it.
>> Signed-off-by: Julien Grall <julien.grall@linaro.org>
>
> With that: Acked-by: Ian Campbell <ian.campbell@citrix.com>
Thanks!
--
Julien Grall
next prev parent reply other threads:[~2014-04-28 14:47 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-22 13:14 [PATCH v4 00/21] IOMMU support for ARM Julien Grall
2014-04-22 13:14 ` [PATCH v4 01/21] xen/arm: map_device: Don't hardcode dom0 in print message Julien Grall
2014-04-28 13:49 ` Ian Campbell
2014-04-22 13:14 ` [PATCH v4 02/21] xen/arm: Constify address pointer for cache helpers Julien Grall
2014-04-28 13:52 ` Ian Campbell
2014-04-22 13:14 ` [PATCH v4 03/21] xen/arm: p2m: Move comment that was misplaced Julien Grall
2014-04-28 13:52 ` Ian Campbell
2014-04-22 13:14 ` [PATCH v4 04/21] xen/arm: p2m: apply_p2m_changes: Only load domain P2M when we flush TLBs Julien Grall
2014-04-28 13:54 ` Ian Campbell
2014-04-28 13:57 ` Julien Grall
2014-04-22 13:14 ` [PATCH v4 05/21] xen/common: grant-table: only call IOMMU if paging mode translate is disabled Julien Grall
2014-04-22 13:14 ` [PATCH v4 06/21] xen/passthrough: amd: Remove domain_id from hvm_iommu Julien Grall
2014-04-28 16:38 ` Julien Grall
2014-04-29 7:43 ` Jan Beulich
2014-04-30 4:02 ` Suravee Suthikulpanit
2014-04-30 3:56 ` Suravee Suthikulpanit
2014-04-30 11:32 ` Julien Grall
2014-04-22 13:14 ` [PATCH v4 07/21] xen/passthrough: amd: rename iommu_has_feature into amd_iommu_has_feature Julien Grall
2014-04-28 13:56 ` Ian Campbell
2014-04-28 16:38 ` Julien Grall
2014-05-02 13:11 ` Julien Grall
2014-05-02 16:35 ` Aravind Gopalakrishnan
2014-04-22 13:14 ` [PATCH v4 08/21] xen/passthrough: vtd: iommu_set_hwdom_mapping is VTD specific Julien Grall
2014-04-22 13:41 ` Jan Beulich
2014-04-22 14:47 ` Julien Grall
2014-04-22 13:14 ` [PATCH v4 09/21] xen/dts: Add dt_property_read_bool Julien Grall
2014-04-22 13:14 ` [PATCH v4 10/21] xen/dts: Add dt_parse_phandle_with_args and dt_parse_phandle Julien Grall
2014-04-22 13:14 ` [PATCH v4 11/21] xen/passthrough: rework hwdom_pvh_reqs to use it also on ARM Julien Grall
2014-04-28 13:57 ` Ian Campbell
2014-04-22 13:14 ` [PATCH v4 12/21] xen/passthrough: iommu: Split generic IOMMU code Julien Grall
2014-04-22 13:48 ` Jan Beulich
2014-04-22 13:52 ` Jan Beulich
2014-04-22 14:58 ` Julien Grall
2014-04-22 16:33 ` Jan Beulich
2014-04-22 16:45 ` Julien Grall
2014-04-22 16:59 ` Jan Beulich
2014-04-22 18:02 ` Julien Grall
2014-04-23 8:43 ` Jan Beulich
2014-04-23 12:42 ` Julien Grall
2014-04-22 13:14 ` [PATCH v4 13/21] xen/passthrough: iommu: Introduce arch specific code Julien Grall
2014-04-28 16:39 ` Julien Grall
[not found] ` <CAAAAutDRYoqdSBdDsETqtzVDdXmy6jq1Jnm1ck8c5eTqbkMUFw@mail.gmail.com>
2014-05-05 21:12 ` Fwd: " Aravind Gopalakrishnan
2014-04-22 13:14 ` [PATCH v4 14/21] xen/passthrough: iommu: Basic support of device tree assignment Julien Grall
2014-04-28 14:01 ` Ian Campbell
2014-04-28 14:12 ` Julien Grall
2014-04-22 13:14 ` [PATCH v4 15/21] xen/passthrough: Introduce IOMMU ARM architecture Julien Grall
2014-04-28 14:04 ` Ian Campbell
2014-04-28 14:21 ` Julien Grall
2014-04-22 13:14 ` [PATCH v4 16/21] MAINTAINERS: Add drivers/passthrough/arm Julien Grall
2014-04-22 13:50 ` Jan Beulich
2014-04-22 15:02 ` Julien Grall
2014-04-22 16:35 ` Jan Beulich
2014-04-22 18:02 ` Julien Grall
2014-04-22 13:14 ` [PATCH v4 17/21] xen/arm: Don't give IOMMU devices to dom0 when iommu is disabled Julien Grall
2014-04-22 13:14 ` [PATCH v4 18/21] xen/arm: p2m: Clean cache PT when the IOMMU doesn't support coherent walk Julien Grall
2014-04-28 14:09 ` Ian Campbell
2014-04-28 14:46 ` Julien Grall
2014-04-28 16:34 ` Julien Grall
2014-04-29 7:40 ` Jan Beulich
2014-05-02 15:15 ` Julien Grall
2014-04-22 13:14 ` [PATCH v4 19/21] xen/arm: grant: Add another entry to map MFN 1:1 in dom0 p2m Julien Grall
2014-04-28 14:11 ` Ian Campbell
2014-04-28 14:47 ` Julien Grall [this message]
2014-04-22 13:14 ` [PATCH v4 20/21] drivers/passthrough: arm: Add support for SMMU drivers Julien Grall
2014-04-28 14:13 ` Ian Campbell
2014-04-22 13:14 ` [PATCH v4 21/21] xen/arm: Add the property "protected-devices" in the hypervisor node Julien Grall
2014-05-02 12:54 ` [PATCH v4 00/21] IOMMU support for ARM Ian Campbell
2014-05-02 13:09 ` Julien Grall
2014-05-02 13:15 ` Julien Grall
2014-05-02 13:25 ` Ian Campbell
2014-05-02 13:29 ` Julien Grall
2014-05-02 14:20 ` Ian Campbell
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