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From: Fenghua Yu <fenghua.yu@intel.com>
To: "Liu, Yi L" <yi.l.liu@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	"Hansen, Dave" <dave.hansen@intel.com>,
	H Peter Anvin <hpa@zytor.com>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	"Jiang, Dave" <dave.jiang@intel.com>,
	"Raj, Ashok" <ashok.raj@intel.com>, x86 <x86@kernel.org>,
	amd-gfx <amd-gfx@lists.freedesktop.org>,
	Christoph Hellwig <hch@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	"Shankar, Ravi V" <ravi.v.shankar@intel.com>,
	Borislav Petkov <bp@alien8.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Luck, Tony" <tony.luck@intel.com>,
	Felix Kuehling <Felix.Kuehling@amd.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	"Pan, Jacob jun" <jacob.jun.pan@intel.com>,
	David Woodhouse <dwmw2@infradead.org>
Subject: Re: [PATCH v6 01/12] iommu: Change type of pasid to u32
Date: Tue, 14 Jul 2020 06:54:49 -0700	[thread overview]
Message-ID: <20200714135449.GI32961@romley-ivt3.sc.intel.com> (raw)
In-Reply-To: <DM5PR11MB1435D67E0CE9D8D4C1D7F675C3610@DM5PR11MB1435.namprd11.prod.outlook.com>

On Mon, Jul 13, 2020 at 07:45:49PM -0700, Liu, Yi L wrote:
> > From: Fenghua Yu <fenghua.yu@intel.com>
> > Sent: Tuesday, July 14, 2020 7:48 AM
> >
> > PASID is defined as a few different types in iommu including "int",
> > "u32", and "unsigned int". To be consistent and to match with uapi
> > definitions, define PASID and its variations (e.g. max PASID) as "u32".
> > "u32" is also shorter and a little more explicit than "unsigned int".
> >
> > No PASID type change in uapi although it defines PASID as __u64 in
> > some places.
> 
> just out of curious, why not using ioasid_t? In Linux kernel, PASID is
> managed by ioasid.

ioasid_t is only used in limited underneath files (ioasid.c and ioasid.h).
Instead of changing hundreds of places to use ioasid_t, it's better to
keep ioasid_t only used in the files.

And it's explict and matches with uapi to define PASID as u32. Changing
to ioasid_t in so many files (amd, gpu, crypto, etc) may confuse upper
users on "why ioasid_t".

So we had better to explicitly define PASID as u32 and keep ioasid_t in
the limited underneath files.

Thanks.

-Fenghua
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  reply	other threads:[~2020-07-14 13:55 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-13 23:47 [PATCH v6 00/12] x86: tag application address space for devices Fenghua Yu
2020-07-13 23:47 ` [PATCH v6 01/12] iommu: Change type of pasid to u32 Fenghua Yu
2020-07-14  2:45   ` Liu, Yi L
2020-07-14 13:54     ` Fenghua Yu [this message]
2020-07-14 13:56       ` Liu, Yi L
2020-07-22 14:03   ` Joerg Roedel
2020-07-22 17:21     ` Fenghua Yu
2020-07-13 23:47 ` [PATCH v6 02/12] iommu/vt-d: Change flags type to unsigned int in binding mm Fenghua Yu
2020-07-13 23:47 ` [PATCH v6 03/12] docs: x86: Add documentation for SVA (Shared Virtual Addressing) Fenghua Yu
2020-07-14  3:25   ` Liu, Yi L
2020-07-15 23:32     ` Fenghua Yu
2020-07-13 23:47 ` [PATCH v6 04/12] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions Fenghua Yu
2020-07-13 23:48 ` [PATCH v6 05/12] x86/fpu/xstate: Add supervisor PASID state for ENQCMD feature Fenghua Yu
2020-07-13 23:48 ` [PATCH v6 06/12] x86/msr-index: Define IA32_PASID MSR Fenghua Yu
2020-07-13 23:48 ` [PATCH v6 07/12] mm: Define pasid in mm Fenghua Yu
2020-07-13 23:48 ` [PATCH v6 08/12] fork: Clear PASID for new mm Fenghua Yu
2021-02-24 10:19   ` Jean-Philippe Brucker
2021-02-25 22:17     ` Fenghua Yu
2021-03-01 23:00       ` Jacob Pan
2021-03-02 10:43         ` Jean-Philippe Brucker
2020-07-13 23:48 ` [PATCH v6 09/12] x86/process: Clear PASID state for a newly forked/cloned thread Fenghua Yu
2020-08-01  1:44   ` Andy Lutomirski
2020-07-13 23:48 ` [PATCH v6 10/12] x86/mmu: Allocate/free PASID Fenghua Yu
2020-07-13 23:48 ` [PATCH v6 11/12] sched: Define and initialize a flag to identify valid PASID in the task Fenghua Yu
2020-07-13 23:48 ` [PATCH v6 12/12] x86/traps: Fix up invalid PASID Fenghua Yu
2020-07-31 23:34   ` Andy Lutomirski
2020-08-01  0:42     ` Fenghua Yu
2020-08-03 15:03     ` Dave Hansen
2020-08-03 15:12       ` Andy Lutomirski
2020-08-03 15:19         ` Raj, Ashok
2020-08-03 16:36         ` Dave Hansen
2020-08-03 17:16           ` Andy Lutomirski
2020-08-03 17:34             ` Dave Hansen
2020-08-03 19:24               ` Andy Lutomirski
2020-08-01  1:28   ` Andy Lutomirski
2020-08-03 17:19     ` Fenghua Yu

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