linux-kernel - Re: [PATCH RFC 02/11] iommu: Add iommu

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Message-ID: <4f9d5857-c16d-8201-00ea-28f0cb6bbaf8@linux.intel.com>
Date:   Mon, 21 Mar 2022 18:23:07 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        Joerg Roedel <joro@...tes.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
Cc:     baolu.lu@...ux.intel.com, Eric Auger <eric.auger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC 02/11] iommu: Add iommu_domain type for SVA

On 2022/3/21 15:06, Tian, Kevin wrote:
>> From: Lu Baolu<baolu.lu@...ux.intel.com>
>> Sent: Sunday, March 20, 2022 2:40 PM
>>
>> Add a new iommu domain type IOMMU_DOMAIN_SVA to represent an I/O
>> page
>> table which is shared from CPU host VA. Add a sva_cookie field in the
>> iommu_domain structure to save the mm_struct which represent the CPU
>> memory page table.
>>
>> Signed-off-by: Lu Baolu<baolu.lu@...ux.intel.com>
>> ---
>>   include/linux/iommu.h | 6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
>> index 36f43af0af53..3e179b853380 100644
>> --- a/include/linux/iommu.h
>> +++ b/include/linux/iommu.h
>> @@ -64,6 +64,9 @@ struct iommu_domain_geometry {
>>   #define __IOMMU_DOMAIN_PT	(1U << 2)  /* Domain is identity
>> mapped   */
>>   #define __IOMMU_DOMAIN_DMA_FQ	(1U << 3)  /* DMA-API uses
>> flush queue    */
>>
>> +#define __IOMMU_DOMAIN_SHARED	(1U << 4)  /* Page table shared from
>> CPU  */
>> +#define __IOMMU_DOMAIN_HOST_VA	(1U << 5)  /* Host CPU virtual
>> address */
> suppose the SHARED bit will be also used for KVM page table sharing and
> HOST_VA bit is to differentiate mm sharing from the latter?
> 

Yes, that's my intention.

Best regards,
baolu