linux-kernel - Re: [PATCH v6 7/9] iommu/amd: Move erratum 63 logic to write_dte

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Message-ID: <473c387d-39a1-47a7-a259-b43287f82931@amd.com>
Date: Thu, 31 Oct 2024 15:53:22 +0700
From: "Suthikulpanit, Suravee" <suravee.suthikulpanit@....com>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: linux-kernel@...r.kernel.org, iommu@...ts.linux.dev, joro@...tes.org,
 robin.murphy@....com, vasant.hegde@....com, kevin.tian@...el.com,
 jon.grimm@....com, santosh.shukla@....com, pandoh@...gle.com,
 kumaranand@...gle.com
Subject: Re: [PATCH v6 7/9] iommu/amd: Move erratum 63 logic to
 write_dte_lower128()



On 10/16/2024 8:30 PM, Jason Gunthorpe wrote:
> On Wed, Oct 16, 2024 at 05:17:54AM +0000, Suravee Suthikulpanit wrote:
> 
>> diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
>> index c03e2d9d2990..a8c0a57003a8 100644
>> --- a/drivers/iommu/amd/iommu.c
>> +++ b/drivers/iommu/amd/iommu.c
>> @@ -105,6 +105,10 @@ static void write_dte_lower128(struct dev_table_entry *ptr, struct dev_table_ent
>>   
>>   	old.data128[0] = READ_ONCE(ptr->data128[0]);
>>   	do {
>> +		/* Apply erratum 63 */
>> +		if (FIELD_GET(DTE_DATA1_SYSMGT_MASK, new->data[1]) == 0x1)
>> +			new->data[0] |= DTE_FLAG_IW;
>> +
> 
> Why not put it in set_dte_entry() ?

Ok. Good point.

Suravee