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Date:   Tue, 15 Feb 2022 10:55:19 +0100
From:   Joerg Roedel <joro@8bytes.org>
To:     Fenghua Yu <fenghua.yu@intel.com>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Andy Lutomirski <luto@kernel.org>,
        Tony Luck <tony.luck@intel.com>,
        Lu Baolu <baolu.lu@linux.intel.com>,
        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>,
        iommu@lists.linux-foundation.org, x86 <x86@kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4 05/11] iommu/sva: Assign a PASID to mm on PASID
 allocation and free it on mm exit
Message-ID: <Ygt4h0PgYzKOiB38@8bytes.org>
References: <20220207230254.3342514-1-fenghua.yu@intel.com>
 <20220207230254.3342514-6-fenghua.yu@intel.com>
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On Mon, Feb 07, 2022 at 03:02:48PM -0800, Fenghua Yu wrote:
> PASIDs are process wide. It was attempted to use refcounted PASIDs to
> free them when the last thread drops the refcount. This turned out to
> be complex and error prone. Given the fact that the PASID space is 20
> bits, which allows up to 1M processes to have a PASID associated
> concurrently, PASID resource exhaustion is not a realistic concern.
> 
> Therefore it was decided to simplify the approach and stick with lazy
> on demand PASID allocation, but drop the eager free approach and make
> a allocated PASID lifetime bound to the life time of the process.
> 
> Get rid of the refcounting mechanisms and replace/rename the interfaces
> to reflect this new approach.
> 
> Suggested-by: Dave Hansen <dave.hansen@linux.intel.com>
> Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
> Reviewed-by: Tony Luck <tony.luck@intel.com>

Acked-by: Joerg Roedel <jroedel@suse.de>