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From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: Auger Eric <eric.auger@redhat.com>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
	Jacob Pan <jacob.pan.linux@gmail.com>,
	Raj Ashok <ashok.raj@intel.com>,
	David Woodhouse <dwmw2@infradead.org>,
	LKML <linux-kernel@vger.kernel.org>,
	iommu@lists.linux-foundation.org, Wu Hao <hao.wu@intel.com>,
	Jean-Philippe Brucker <jean-philippe@linaro.com>
Subject: Re: [PATCH v2 9/9] iommu/vt-d: Store guest PASID during bind
Date: Thu, 10 Sep 2020 10:12:48 -0700	[thread overview]
Message-ID: <20200910101248.19460882@jacob-builder> (raw)
In-Reply-To: <60feda75-5862-c898-97b1-1f5eafdb8d8c@redhat.com>

On Tue, 1 Sep 2020 19:08:44 +0200
Auger Eric <eric.auger@redhat.com> wrote:

> Hi Jacob,
> On 8/22/20 6:35 AM, Jacob Pan wrote:
> > IOASID core maintains the guest-host mapping in the form of SPID and
> > IOASID. This patch assigns the guest PASID (if valid) as SPID while
> > binding guest page table with a host PASID. This mapping will be
> > used for lookup and notifications.
> > 
> > Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
> > ---
> >  drivers/iommu/intel/svm.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
> > index d8a5efa75095..4c958b1aec4c 100644
> > --- a/drivers/iommu/intel/svm.c
> > +++ b/drivers/iommu/intel/svm.c
> > @@ -406,6 +406,7 @@ int intel_svm_bind_gpasid(struct iommu_domain
> > *domain, struct device *dev, if (data->flags &
> > IOMMU_SVA_GPASID_VAL) { svm->gpasid = data->gpasid;
> >  			svm->flags |= SVM_FLAG_GUEST_PASID;
> > +			ioasid_attach_spid(data->hpasid,
> > data->gpasid);  
> don't you want to handle the returned value?
Yes, I also need to add a check for duplicated SPID within a set.

> >  		}
> >  		svm->iommu = iommu;
> >  		/*
> > @@ -517,6 +518,7 @@ int intel_svm_unbind_gpasid(struct device *dev,
> > int pasid) ioasid_attach_data(pasid, NULL);
> >  				ioasid_notify(pasid, IOASID_UNBIND,
> >  					IOASID_NOTIFY_SET);
> > +				ioasid_attach_spid(pasid,
> > INVALID_IOASID);  
> So this answers my previous question ;-) but won't it enter the if
> (!ioasid_data) path and fail to reset the spid?
> 
Sorry, i am not following. If there is no ioasid_data then there is no
SPID to be stored.

BTW, I plan to separate the APIs into two.
ioasid_attach_spid
ioasid_detach_spid

Only ioasid_detach_spid will be calling synchronize RCU, then
ioasid_attach_spid can be called under spinlock.

Thanks,

> Eric
> >  				kfree(svm);
> >  			}
> >  		}
> >   
> 
> _______________________________________________
> iommu mailing list
> iommu@lists.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/iommu

[Jacob Pan]
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

      reply	other threads:[~2020-09-10 17:10 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-22  4:35 [PATCH v2 0/9] IOASID extensions for guest SVA Jacob Pan
2020-08-22  4:35 ` [PATCH v2 1/9] docs: Document IO Address Space ID (IOASID) APIs Jacob Pan
2020-08-23  7:05   ` Lu Baolu
2020-08-28 17:01     ` Jacob Pan
2020-08-24 10:32   ` Jean-Philippe Brucker
2020-08-27 16:21     ` Auger Eric
2020-09-01 16:56       ` Jacob Pan
2020-09-07  8:03         ` Auger Eric
2020-09-08 17:29           ` Jacob Pan
2020-08-28 22:24     ` Jacob Pan
2020-08-22  4:35 ` [PATCH v2 2/9] iommu/ioasid: Rename ioasid_set_data() Jacob Pan
2020-08-24 18:29   ` Jean-Philippe Brucker
2020-09-01 11:51   ` Auger Eric
2020-08-22  4:35 ` [PATCH v2 3/9] iommu/ioasid: Introduce ioasid_set APIs Jacob Pan
2020-08-22 12:53   ` kernel test robot
2020-08-24  2:24   ` Lu Baolu
2020-09-01 21:28     ` Jacob Pan
2020-09-02  2:39       ` Lu Baolu
2020-08-24 18:28   ` Jean-Philippe Brucker
2020-08-24 18:30     ` Randy Dunlap
2020-09-02 21:46       ` Jacob Pan
2020-08-24 18:34     ` Randy Dunlap
2020-09-02 21:47       ` Jacob Pan
2020-09-02 21:44     ` Jacob Pan
2020-09-01 11:51   ` Auger Eric
2020-09-03 21:07     ` Jacob Pan
2020-09-07  8:04       ` Auger Eric
2020-08-22  4:35 ` [PATCH v2 4/9] iommu/ioasid: Add reference couting functions Jacob Pan
2020-08-24  2:26   ` Lu Baolu
2020-08-25 10:20     ` Jean-Philippe Brucker
2020-08-25 10:19   ` Jean-Philippe Brucker
2020-09-08 20:30     ` Jacob Pan
2020-09-01 12:13   ` Auger Eric
2020-09-08 20:49     ` Jacob Pan
2020-09-24 18:29   ` Shameerali Kolothum Thodi
2020-08-22  4:35 ` [PATCH v2 5/9] iommu/ioasid: Introduce ioasid_set private ID Jacob Pan
2020-08-22  8:36   ` kernel test robot
2020-08-22  9:03   ` kernel test robot
2020-08-25 10:22   ` Jean-Philippe Brucker
2020-09-08 22:19     ` Jacob Pan
2020-09-01 15:38   ` Auger Eric
2020-09-08 22:40     ` Jacob Pan
2020-09-10  9:18       ` Auger Eric
2020-08-22  4:35 ` [PATCH v2 6/9] iommu/ioasid: Introduce notification APIs Jacob Pan
2020-08-25 10:26   ` Jean-Philippe Brucker
2020-09-09 20:37     ` Jacob Pan
2020-09-01 16:49   ` Auger Eric
2020-09-09 22:58     ` Jacob Pan
2020-09-10  8:59       ` Auger Eric
2020-08-22  4:35 ` [PATCH v2 7/9] iommu/vt-d: Listen to IOASID notifications Jacob Pan
2020-09-01 17:03   ` Auger Eric
2020-09-10  4:54     ` Jacob Pan
2020-08-22  4:35 ` [PATCH v2 8/9] iommu/vt-d: Send IOASID bind/unbind notifications Jacob Pan
2020-08-22  4:35 ` [PATCH v2 9/9] iommu/vt-d: Store guest PASID during bind Jacob Pan
2020-09-01 17:08   ` Auger Eric
2020-09-10 17:12     ` Jacob Pan [this message]

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