linux-kernel - Re: [PATCH v4 05/11] iommu/sva: Assign a PASID to mm on PASID allocation and free it on mm exit

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Message-ID: <YgWcfhbu3o5C6jQT@otcwcpicx3.sc.intel.com>
Date:   Thu, 10 Feb 2022 15:15:10 -0800
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        iommu@...ts.linux-foundation.org, x86 <x86@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 05/11] iommu/sva: Assign a PASID to mm on PASID
 allocation and free it on mm exit

On Thu, Feb 10, 2022 at 10:49:04AM -0800, Jacob Pan wrote:
> 
> On Wed, 9 Feb 2022 19:16:14 -0800, Jacob Pan
> <jacob.jun.pan@...ux.intel.com> wrote:
> 
> > Hi Fenghua,
> > 
> > On Mon,  7 Feb 2022 15:02:48 -0800, Fenghua Yu <fenghua.yu@...el.com>
> > wrote:
> > 
> > > @@ -1047,8 +1040,6 @@ struct iommu_sva *intel_svm_bind(struct device
> > > *dev, struct mm_struct *mm, void }
> > >  
> > >  	sva = intel_svm_bind_mm(iommu, dev, mm, flags);
> > > -	if (IS_ERR_OR_NULL(sva))
> > > -		intel_svm_free_pasid(mm);  
> > If bind fails, the PASID has no IOMMU nor CPU context. It should be safe
> > to free here.
> > 
> Actually, here we cannot tell if the bind is the first of the mm so I think
> this is fine.
> 
> Reviewed-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>

Thank you very much for your review, Jacob!

-Fenghua