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Fri, 4 Sep 2020 13:42:12 +0800 From: FelixCui-oc To: Lu Baolu , Joerg Roedel , "iommu@lists.linux-foundation.org" , "linux-kernel@vger.kernel.org" , "David Woodhouse" , Dan Carpenter , "kbuild@lists.01.org" Subject: =?gb2312?B?tPC4tDogtPC4tDogtPC4tDogW1BBVENIIHYzIDIvMl0gaW9tbXUvdnQtZDpB?= =?gb2312?Q?dd_support_for_probing_ACPI_device_in_RMRR?= Thread-Topic: =?gb2312?B?tPC4tDogtPC4tDogW1BBVENIIHYzIDIvMl0gaW9tbXUvdnQtZDpBZGQgc3Vw?= =?gb2312?Q?port_for_probing_ACPI_device_in_RMRR?= Thread-Index: AQHWfFkssCqC/uq8zUSrxxRHHTL9PKlSzvUAgAC26n+AAJ31AIAAkzS7gAFQDQCAAfosxQ== Date: Fri, 4 Sep 2020 05:42:12 +0000 Message-ID: References: <20200827100217.21324-1-FelixCui-oc@zhaoxin.com> <20200827100217.21324-3-FelixCui-oc@zhaoxin.com> <7e5f2c33-c6c3-f344-9014-1f6a306c55aa@linux.intel.com> , <56fc76e5-a31c-36b6-c6f0-fd8370cd7a91@linux.intel.com> In-Reply-To: <56fc76e5-a31c-36b6-c6f0-fd8370cd7a91@linux.intel.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.29.8.19] MIME-Version: 1.0 Cc: Tony W Wang-oc , CobeChen-oc , Ashok Raj X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; 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charset="gb2312" Content-Transfer-Encoding: quoted-printable

hi baolu,

               We run this on zh= aoxin X86 paltform.

               There are some MC= US on our platforms that read and write data to the system memory.

During this process, the MCU is invisible to the host kernel. And the MC= U needs to report through ACPI_NAMESPACE_DEVICE in RMRR.


Best regards

Felixcui-oc

=B7=A2=BC=FE=C8=CB: Lu Ba= olu <baolu.lu@linux.intel.com>
=B7=A2=CB=CD=CA=B1=BC=E4: 2020=C4=EA9=D4=C23=C8=D5 15:22:14
=CA=D5=BC=FE=C8=CB: FelixCui-oc; Joerg Roedel; iommu@lists.linux-fou= ndation.org; linux-kernel@vger.kernel.org; David Woodhouse; Dan Carpenter; = kbuild@lists.01.org
=B3=AD=CB=CD: baolu.lu@linux.intel.com; CobeChen-oc; RaymondPang-oc;= Tony W Wang-oc; Ashok Raj
=D6=F7=CC=E2: Re: =B4=F0=B8=B4: =B4=F0=B8=B4: [PATCH v3 2/2] iommu/v= t-d:Add support for probing ACPI device in RMRR
 
Hi Felix,

On 9/2/20 11:24 AM, FelixCui-oc wrote:
> hi baolu,
>
>> So you have a hidden device (invisible to host kernel). But you ne= ed to
>
>>setup some identity mappings for this device, so that the firmware<= br> >>could keep working, right?
>
>>The platform designs this by putting that range in the RMRR table a= nd
>>expecting the OS kernel to setup identity mappings during boot.
>
>>Do I understand it right?
>
>
> Yes. What you understand is correct.

This appears to be a new usage model of RMRR. I need to discuss this
with the VT-d spec maintainer. Do you mind telling which platform are
you going to run this on? What is the motivation of creating such hidden device?

Basically, RMRRs were added as work around for certain legacy device and we have been working hard to fix those legacy devices so that RMRR are
no longer needed.

Best regards,
baolu
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