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From: Alex Williamson <alex.williamson@redhat.com>
To: "Liu, Yi L" <yi.l.liu@intel.com>
Cc: "jean-philippe@linaro.org" <jean-philippe@linaro.org>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	"Raj,  Ashok" <ashok.raj@intel.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"Tian, Jun J" <jun.j.tian@intel.com>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Sun,  Yi Y" <yi.y.sun@intel.com>, "Wu, Hao" <hao.wu@intel.com>
Subject: Re: [PATCH v1 3/8] vfio/type1: Report PASID alloc/free support to userspace
Date: Fri, 3 Apr 2020 11:28:07 -0600	[thread overview]
Message-ID: <20200403112807.30a56c48@w520.home> (raw)
In-Reply-To: <A2975661238FB949B60364EF0F2C25743A220662@SHSMSX104.ccr.corp.intel.com>

On Fri, 3 Apr 2020 08:17:44 +0000
"Liu, Yi L" <yi.l.liu@intel.com> wrote:

> > From: Alex Williamson < alex.williamson@redhat.com >
> > Sent: Friday, April 3, 2020 2:01 AM
> > To: Liu, Yi L <yi.l.liu@intel.com>
> > Subject: Re: [PATCH v1 3/8] vfio/type1: Report PASID alloc/free support to
> > userspace
> > 
> > On Sun, 22 Mar 2020 05:32:00 -0700
> > "Liu, Yi L" <yi.l.liu@intel.com> wrote:
> >   
> > > From: Liu Yi L <yi.l.liu@intel.com>
> > >
> > > This patch reports PASID alloc/free availability to userspace (e.g.
> > > QEMU) thus userspace could do a pre-check before utilizing this feature.
> > >
> > > Cc: Kevin Tian <kevin.tian@intel.com>
> > > CC: Jacob Pan <jacob.jun.pan@linux.intel.com>
> > > Cc: Alex Williamson <alex.williamson@redhat.com>
> > > Cc: Eric Auger <eric.auger@redhat.com>
> > > Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>
> > > Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
> > > ---
> > >  drivers/vfio/vfio_iommu_type1.c | 28 ++++++++++++++++++++++++++++
> > >  include/uapi/linux/vfio.h       |  8 ++++++++
> > >  2 files changed, 36 insertions(+)
> > >
> > > diff --git a/drivers/vfio/vfio_iommu_type1.c
> > > b/drivers/vfio/vfio_iommu_type1.c index e40afc0..ddd1ffe 100644
> > > --- a/drivers/vfio/vfio_iommu_type1.c
> > > +++ b/drivers/vfio/vfio_iommu_type1.c
> > > @@ -2234,6 +2234,30 @@ static int vfio_iommu_type1_pasid_free(struct  
> > vfio_iommu *iommu,  
> > >  	return ret;
> > >  }
> > >
> > > +static int vfio_iommu_info_add_nesting_cap(struct vfio_iommu *iommu,
> > > +					 struct vfio_info_cap *caps)
> > > +{
> > > +	struct vfio_info_cap_header *header;
> > > +	struct vfio_iommu_type1_info_cap_nesting *nesting_cap;
> > > +
> > > +	header = vfio_info_cap_add(caps, sizeof(*nesting_cap),
> > > +				   VFIO_IOMMU_TYPE1_INFO_CAP_NESTING, 1);
> > > +	if (IS_ERR(header))
> > > +		return PTR_ERR(header);
> > > +
> > > +	nesting_cap = container_of(header,
> > > +				struct vfio_iommu_type1_info_cap_nesting,
> > > +				header);
> > > +
> > > +	nesting_cap->nesting_capabilities = 0;
> > > +	if (iommu->nesting) {
> > > +		/* nesting iommu type supports PASID requests (alloc/free) */
> > > +		nesting_cap->nesting_capabilities |= VFIO_IOMMU_PASID_REQS;
> > > +	}
> > > +
> > > +	return 0;
> > > +}
> > > +
> > >  static long vfio_iommu_type1_ioctl(void *iommu_data,
> > >  				   unsigned int cmd, unsigned long arg)  { @@ -  
> > 2283,6 +2307,10 @@  
> > > static long vfio_iommu_type1_ioctl(void *iommu_data,
> > >  		if (ret)
> > >  			return ret;
> > >
> > > +		ret = vfio_iommu_info_add_nesting_cap(iommu, &caps);
> > > +		if (ret)
> > > +			return ret;
> > > +
> > >  		if (caps.size) {
> > >  			info.flags |= VFIO_IOMMU_INFO_CAPS;
> > >
> > > diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> > > index 298ac80..8837219 100644
> > > --- a/include/uapi/linux/vfio.h
> > > +++ b/include/uapi/linux/vfio.h
> > > @@ -748,6 +748,14 @@ struct vfio_iommu_type1_info_cap_iova_range {
> > >  	struct	vfio_iova_range iova_ranges[];
> > >  };
> > >
> > > +#define VFIO_IOMMU_TYPE1_INFO_CAP_NESTING  2
> > > +
> > > +struct vfio_iommu_type1_info_cap_nesting {
> > > +	struct	vfio_info_cap_header header;
> > > +#define VFIO_IOMMU_PASID_REQS	(1 << 0)
> > > +	__u32	nesting_capabilities;
> > > +};
> > > +
> > >  #define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
> > >
> > >  /**  
> > 
> > I think this answers my PROBE question on patch 1/.   
> yep.
> > Should the quota/usage be exposed to the user here?  Thanks,  
> 
> Do you mean report the quota available for this user in this cap info as well?

Yes.  Would it be useful?

> For usage, do you mean the alloc and free or others?

I mean how many of the quota are currently in allocated, or
alternatively, how many remain.  Thanks,

Alex

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  reply	other threads:[~2020-04-03 17:28 UTC|newest]

Thread overview: 110+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-22 12:31 [PATCH v1 0/8] vfio: expose virtual Shared Virtual Addressing to VMs Liu, Yi L
2020-03-22 12:31 ` [PATCH v1 1/8] vfio: Add VFIO_IOMMU_PASID_REQUEST(alloc/free) Liu, Yi L
2020-03-22 16:21   ` kbuild test robot
2020-03-30  8:32   ` Tian, Kevin
2020-03-30 14:36     ` Liu, Yi L
2020-03-31  5:40       ` Tian, Kevin
2020-03-31 13:22         ` Liu, Yi L
2020-04-01  5:43           ` Tian, Kevin
2020-04-01  5:48             ` Liu, Yi L
2020-03-31  7:53   ` Christoph Hellwig
2020-03-31  8:17     ` Liu, Yi L
2020-03-31  8:32     ` Liu, Yi L
2020-03-31  8:36       ` Liu, Yi L
2020-03-31  9:15         ` Christoph Hellwig
2020-04-02 13:52   ` Jean-Philippe Brucker
2020-04-03 11:56     ` Liu, Yi L
2020-04-03 12:39       ` Jean-Philippe Brucker
2020-04-03 12:44         ` Liu, Yi L
2020-04-02 17:50   ` Alex Williamson
2020-04-03  5:58     ` Tian, Kevin
2020-04-03 15:14       ` Alex Williamson
2020-04-07  4:42         ` Tian, Kevin
2020-04-07 15:14           ` Alex Williamson
2020-04-03 13:12     ` Liu, Yi L
2020-04-03 17:50       ` Alex Williamson
2020-04-07  4:52         ` Tian, Kevin
2020-04-08  0:52         ` Liu, Yi L
2020-03-22 12:31 ` [PATCH v1 2/8] vfio/type1: Add vfio_iommu_type1 parameter for quota tuning Liu, Yi L
2020-03-22 17:20   ` kbuild test robot
2020-03-30  8:40   ` Tian, Kevin
2020-03-30  8:52     ` Liu, Yi L
2020-03-30  9:19       ` Tian, Kevin
2020-03-30  9:26         ` Liu, Yi L
2020-03-30 11:44           ` Tian, Kevin
2020-04-02 17:58             ` Alex Williamson
2020-04-03  8:15               ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 3/8] vfio/type1: Report PASID alloc/free support to userspace Liu, Yi L
2020-03-30  9:43   ` Tian, Kevin
2020-04-01  7:46     ` Liu, Yi L
2020-04-01  9:41   ` Auger Eric
2020-04-01 13:13     ` Liu, Yi L
2020-04-02 18:01   ` Alex Williamson
2020-04-03  8:17     ` Liu, Yi L
2020-04-03 17:28       ` Alex Williamson [this message]
2020-04-04 11:36         ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 4/8] vfio: Check nesting iommu uAPI version Liu, Yi L
2020-03-22 18:30   ` kbuild test robot
2020-03-22 12:32 ` [PATCH v1 5/8] vfio/type1: Report 1st-level/stage-1 format to userspace Liu, Yi L
2020-03-22 16:44   ` kbuild test robot
2020-03-30 11:48   ` Tian, Kevin
2020-04-01  7:38     ` Liu, Yi L
2020-04-01  7:56       ` Tian, Kevin
2020-04-01  8:06         ` Liu, Yi L
2020-04-01  8:08           ` Tian, Kevin
2020-04-01  8:09             ` Liu, Yi L
2020-04-01  8:51   ` Auger Eric
2020-04-01 12:51     ` Liu, Yi L
2020-04-01 13:01       ` Auger Eric
2020-04-03  8:23         ` Jean-Philippe Brucker
2020-04-07  9:43           ` Liu, Yi L
2020-04-08  1:02             ` Liu, Yi L
2020-04-08 10:27             ` Auger Eric
2020-04-09  8:14               ` Jean-Philippe Brucker
2020-04-09  9:01                 ` Auger Eric
2020-04-09 12:47                 ` Liu, Yi L
2020-04-10  3:28                   ` Auger Eric
2020-04-10  3:48                     ` Liu, Yi L
2020-04-10 12:30                   ` Liu, Yi L
2020-04-02 19:20   ` Alex Williamson
2020-04-03 11:59     ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 6/8] vfio/type1: Bind guest page tables to host Liu, Yi L
2020-03-22 18:10   ` kbuild test robot
2020-03-30 12:46   ` Tian, Kevin
2020-04-01  9:13     ` Liu, Yi L
2020-04-02  2:12       ` Tian, Kevin
2020-04-02  8:05         ` Liu, Yi L
2020-04-03  8:34           ` Jean-Philippe Brucker
2020-04-07 10:33             ` Liu, Yi L
2020-04-09  8:28               ` Jean-Philippe Brucker
2020-04-09  9:15                 ` Liu, Yi L
2020-04-09  9:38                   ` Jean-Philippe Brucker
2020-04-02 19:57   ` Alex Williamson
2020-04-03 13:30     ` Liu, Yi L
2020-04-03 18:11       ` Alex Williamson
2020-04-04 10:28         ` Liu, Yi L
2020-04-11  5:52     ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 7/8] vfio/type1: Add VFIO_IOMMU_CACHE_INVALIDATE Liu, Yi L
2020-03-30 12:58   ` Tian, Kevin
2020-04-01  7:49     ` Liu, Yi L
2020-03-31  7:56   ` Christoph Hellwig
2020-03-31 10:48     ` Liu, Yi L
2020-04-02 20:24   ` Alex Williamson
2020-04-03  6:39     ` Tian, Kevin
2020-04-03 15:31       ` Jacob Pan
2020-04-03 15:34       ` Alex Williamson
2020-04-08  2:28         ` Liu, Yi L
2020-04-16 10:40         ` Liu, Yi L
2020-04-16 12:09           ` Tian, Kevin
2020-04-16 12:42             ` Auger Eric
2020-04-16 13:28               ` Tian, Kevin
2020-04-16 15:12                 ` Auger Eric
2020-04-16 14:40           ` Alex Williamson
2020-04-16 14:48             ` Alex Williamson
2020-04-17  6:03             ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 8/8] vfio/type1: Add vSVA support for IOMMU-backed mdevs Liu, Yi L
2020-03-30 13:18   ` Tian, Kevin
2020-04-01  7:51     ` Liu, Yi L
2020-04-02 20:33   ` Alex Williamson
2020-04-03 13:39     ` Liu, Yi L
2020-03-26 12:56 ` [PATCH v1 0/8] vfio: expose virtual Shared Virtual Addressing to VMs Liu, Yi L

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