linux-kernel - Re: [PATCH v4 09/12] iommu/vt-d: Add iotlb flush for nested domain

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Message-ID: <ZN+3spv3/8N2IDVa@Asurada-Nvidia>
Date:   Fri, 18 Aug 2023 11:25:54 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     "Liu, Yi L" <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
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        "robin.murphy@....com" <robin.murphy@....com>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
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        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "Duan, Zhenzhong" <zhenzhong.duan@...el.com>
Subject: Re: [PATCH v4 09/12] iommu/vt-d: Add iotlb flush for nested domain

On Fri, Aug 18, 2023 at 03:20:55PM -0300, Jason Gunthorpe wrote:
> On Fri, Aug 18, 2023 at 10:56:45AM -0700, Nicolin Chen wrote:
> 
> > > The highest array index sounds generic, the error code maybe is too
> > 
> > We could do in its and report the error code in its raw form:
> > 	__u32 out_array_index;
> > 	/* number of bits used to report error code in the returned array_index */
> > 	__u32 out_array_index_error_code_bits;
> > Or just:
> > 	__u32 out_array_index;
> > 	__u32 out_error_code;
> > 
> > Do we have to define a list of generic error code?
> 
> out_driver_error_code may be OK

Ack. Will implement the array in that way.

Thanks!
Nic