From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Williamson Subject: Re: [PATCH v8 7/9] vfio/mdev: Add iommu related member in mdev_device Date: Tue, 26 Mar 2019 11:42:28 -0600 Message-ID: <20190326114228.5380be3c@x1.home> References: <20190325013036.18400-1-baolu.lu@linux.intel.com> <20190325013036.18400-8-baolu.lu@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20190325013036.18400-8-baolu.lu@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org To: Lu Baolu Cc: Joerg Roedel , David Woodhouse , Kirti Wankhede , ashok.raj@intel.com, sanjay.k.kumar@intel.com, jacob.jun.pan@intel.com, kevin.tian@intel.com, Jean-Philippe Brucker , yi.l.liu@intel.com, yi.y.sun@intel.com, peterx@redhat.com, tiwei.bie@intel.com, xin.zeng@intel.com, iommu@lists.linux-foundation.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Jacob Pan List-Id: iommu@lists.linux-foundation.org On Mon, 25 Mar 2019 09:30:34 +0800 Lu Baolu wrote: > A parent device might create different types of mediated > devices. For example, a mediated device could be created > by the parent device with full isolation and protection > provided by the IOMMU. One usage case could be found on > Intel platforms where a mediated device is an assignable > subset of a PCI, the DMA requests on behalf of it are all > tagged with a PASID. Since IOMMU supports PASID-granular > translations (scalable mode in VT-d 3.0), this mediated > device could be individually protected and isolated by an > IOMMU. > > This patch adds a new member in the struct mdev_device to > indicate that the mediated device represented by mdev could > be isolated and protected by attaching a domain to a device > represented by mdev->iommu_device. It also adds a helper to > add or set the iommu device. > > * mdev_device->iommu_device > - This, if set, indicates that the mediated device could > be fully isolated and protected by IOMMU via attaching > an iommu domain to this device. If empty, it indicates > using vendor defined isolation, hence bypass IOMMU. > > * mdev_set/get_iommu_device(dev, iommu_device) > - Set or get the iommu device which represents this mdev > in IOMMU's device scope. Drivers don't need to set the > iommu device if it uses vendor defined isolation. > > Cc: Ashok Raj > Cc: Jacob Pan > Cc: Kevin Tian > Cc: Liu Yi L > Suggested-by: Kevin Tian > Suggested-by: Alex Williamson > Signed-off-by: Lu Baolu > Reviewed-by: Jean-Philippe Brucker > --- > drivers/vfio/mdev/mdev_core.c | 18 ++++++++++++++++++ > drivers/vfio/mdev/mdev_private.h | 1 + > include/linux/mdev.h | 14 ++++++++++++++ > 3 files changed, 33 insertions(+) Acked-by: Alex Williamson > diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c > index b96fedc77ee5..1b6435529166 100644 > --- a/drivers/vfio/mdev/mdev_core.c > +++ b/drivers/vfio/mdev/mdev_core.c > @@ -390,6 +390,24 @@ int mdev_device_remove(struct device *dev, bool force_remove) > return 0; > } > > +int mdev_set_iommu_device(struct device *dev, struct device *iommu_device) > +{ > + struct mdev_device *mdev = to_mdev_device(dev); > + > + mdev->iommu_device = iommu_device; > + > + return 0; > +} > +EXPORT_SYMBOL(mdev_set_iommu_device); > + > +struct device *mdev_get_iommu_device(struct device *dev) > +{ > + struct mdev_device *mdev = to_mdev_device(dev); > + > + return mdev->iommu_device; > +} > +EXPORT_SYMBOL(mdev_get_iommu_device); > + > static int __init mdev_init(void) > { > return mdev_bus_register(); > diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h > index 379758c52b1b..bfb7b22a7cb6 100644 > --- a/drivers/vfio/mdev/mdev_private.h > +++ b/drivers/vfio/mdev/mdev_private.h > @@ -34,6 +34,7 @@ struct mdev_device { > struct list_head next; > struct kobject *type_kobj; > bool active; > + struct device *iommu_device; > }; > > #define to_mdev_device(dev) container_of(dev, struct mdev_device, dev) > diff --git a/include/linux/mdev.h b/include/linux/mdev.h > index d7aee90e5da5..df2ea39f47ee 100644 > --- a/include/linux/mdev.h > +++ b/include/linux/mdev.h > @@ -15,6 +15,20 @@ > > struct mdev_device; > > +/* > + * Called by the parent device driver to set the device which represents > + * this mdev in iommu protection scope. By default, the iommu device is > + * NULL, that indicates using vendor defined isolation. > + * > + * @dev: the mediated device that iommu will isolate. > + * @iommu_device: a pci device which represents the iommu for @dev. > + * > + * Return 0 for success, otherwise negative error value. > + */ > +int mdev_set_iommu_device(struct device *dev, struct device *iommu_device); > + > +struct device *mdev_get_iommu_device(struct device *dev); > + > /** > * struct mdev_parent_ops - Structure to be registered for each parent device to > * register the device to mdev module.