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From: Thomas Gleixner <tglx@linutronix.de>
To: Fenghua Yu <fenghua.yu@intel.com>, Ingo Molnar <mingo@redhat.com>,
	Borislav Petkov <bp@alien8.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Andy Lutomirski <luto@kernel.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Tony Luck <tony.luck@intel.com>,
	Lu Baolu <baolu.lu@linux.intel.com>,
	Joerg Roedel <joro@8bytes.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Jacob Pan <jacob.jun.pan@linux.intel.com>,
	Ashok Raj <ashok.raj@intel.com>,
	Ravi V Shankar <ravi.v.shankar@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>,
	iommu@lists.linux-foundation.org, x86 <x86@kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 05/11] iommu/sva: Assign a PASID to mm on PASID allocation and free it on mm exit
Date: Mon, 24 Jan 2022 21:36:00 +0100	[thread overview]
Message-ID: <87bl006fdb.ffs@tglx> (raw)
In-Reply-To: <87ee4w6g1n.ffs@tglx>

On Mon, Jan 24 2022 at 21:21, Thomas Gleixner wrote:
>
> Hrm. This is odd.
>
>> +/* Associate a PASID with an mm_struct: */
>> +static inline void mm_pasid_get(struct mm_struct *mm, u32 pasid)
>> +{
>> +	mm->pasid = pasid;
>> +}
>
> This does not get anything. It sets the allocated PASID in the mm. The
> refcount on the PASID was already taken by the allocation. So this
> should be mm_pasid_set() or mm_pasid_install(), right?

And as a result of all this ioasid_get() is now left without users...

Thanks,

        tglx
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  parent reply	other threads:[~2022-01-24 20:36 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-17 22:01 [PATCH v2 00/11] Re-enable ENQCMD and PASID MSR Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 01/11] iommu/sva: Rename CONFIG_IOMMU_SVA_LIB to CONFIG_IOMMU_SVA Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 02/11] mm: Change CONFIG option for mm->pasid field Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 03/11] iommu/ioasid: Introduce a helper to check for valid PASIDs Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 04/11] kernel/fork: Initialize mm's PASID Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 05/11] iommu/sva: Assign a PASID to mm on PASID allocation and free it on mm exit Fenghua Yu
2022-01-24 20:21   ` Thomas Gleixner
2022-01-24 20:33     ` Fenghua Yu
2022-01-24 20:36     ` Thomas Gleixner [this message]
2022-01-24 20:52       ` Fenghua Yu
2022-01-24 20:55         ` Thomas Gleixner
2022-01-25 15:18           ` Fenghua Yu
2022-01-26 14:23             ` Thomas Gleixner
2022-01-26 17:36               ` Fenghua Yu
2022-01-26 21:38                 ` Thomas Gleixner
2022-01-28  2:42                   ` Fenghua Yu
2022-01-28 14:53                     ` Thomas Gleixner
2021-12-17 22:01 ` [PATCH v2 06/11] x86/fpu: Clear PASID when copying fpstate Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 07/11] sched: Define and initialize a flag to identify valid PASID in the task Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 08/11] x86/traps: Demand-populate PASID MSR via #GP Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 09/11] x86/cpufeatures: Re-enable ENQCMD Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 10/11] tools/objtool: Check for use of the ENQCMD instruction in the kernel Fenghua Yu
2021-12-17 22:57   ` Josh Poimboeuf
2021-12-27 17:50     ` Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 11/11] docs: x86: Change documentation for SVA (Shared Virtual Addressing) Fenghua Yu
2021-12-27 17:52 ` [PATCH v2 00/11] Re-enable ENQCMD and PASID MSR Fenghua Yu

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