linux-kernel - Re: [PATCH 10/18] iommu/vt-d: Add custom allocator for IOASID

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Date:   Tue, 16 Apr 2019 08:30:25 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        "Yi Liu" <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        "Christoph Hellwig" <hch@...radead.org>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        Andriy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH 10/18] iommu/vt-d: Add custom allocator for IOASID

On Mon, 15 Apr 2019 14:37:11 -0600
Alex Williamson <alex.williamson@...hat.com> wrote:

> On Mon,  8 Apr 2019 16:59:25 -0700
> Jacob Pan <jacob.jun.pan@...ux.intel.com> wrote:
> 
> > When VT-d driver runs in the guest, PASID allocation must be
> > performed via virtual command interface. This patch register a
> > custom IOASID allocator which takes precedence over the default
> > IDR based allocator. The resulting IOASID allocation will always
> > come from the host. This ensures that PASID namespace is system-
> > wide.
> > 
> > Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> > Signed-off-by: Liu, Yi L <yi.l.liu@...el.com>
> > Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> > ---
> >  drivers/iommu/intel-iommu.c | 50
> > +++++++++++++++++++++++++++++++++++++++++++++
> > include/linux/intel-iommu.h |  1 + 2 files changed, 51 insertions(+)
> > 
> > diff --git a/drivers/iommu/intel-iommu.c
> > b/drivers/iommu/intel-iommu.c index 28cb713..a38d774 100644
> > --- a/drivers/iommu/intel-iommu.c
> > +++ b/drivers/iommu/intel-iommu.c
> > @@ -4820,6 +4820,42 @@ static int __init
> > platform_optin_force_iommu(void) return 1;
> >  }
> >  
> > +static ioasid_t intel_ioasid_alloc(ioasid_t min, ioasid_t max,
> > void *data) +{
> > +	struct intel_iommu *iommu = data;
> > +	ioasid_t ioasid;
> > +
> > +	if (vcmd_alloc_pasid(iommu, &ioasid))
> > +		return INVALID_IOASID;
> > +	return ioasid;  
> 
> How does this honor min/max?
> 
Sorry I missed this in my previous reply.
VT-d virtual command interface always allocate PASIDs with full 20bit
range. I think a range checking is missing here. Thanks for pointing
this out.

>  [...]  
>