On 26/04/17 11:12, Liu, Yi L wrote: > From: "Liu, Yi L" <yi.l.liu@xxxxxxxxxxxxxxx> > > This patch adds VFIO_IOMMU_SVM_BIND_TASK for potential PASID table > binding requests. > > On VT-d, this IOCTL cmd would be used to link the guest PASID page table > to host. While for other vendors, it may also be used to support other > kind of SVM bind request. Previously, there is a discussion on it with > ARM engineer. It can be found by the link below. This IOCTL cmd may > support SVM PASID bind request from userspace driver, or page table(cr3) > bind request from guest. These SVM bind requests would be supported by > adding different flags. e.g. VFIO_SVM_BIND_PASID is added to support > PASID bind from userspace driver, VFIO_SVM_BIND_PGTABLE is added to > support page table bind from guest. > > https://patchwork.kernel.org/patch/9594231/ > > Signed-off-by: Liu, Yi L <yi.l.liu@xxxxxxxxxxxxxxx> > --- > include/uapi/linux/vfio.h | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h > index 519eff3..6b97987 100644 > --- a/include/uapi/linux/vfio.h > +++ b/include/uapi/linux/vfio.h > @@ -547,6 +547,23 @@ struct vfio_iommu_type1_dma_unmap { > #define VFIO_IOMMU_ENABLE _IO(VFIO_TYPE, VFIO_BASE + 15) > #define VFIO_IOMMU_DISABLE _IO(VFIO_TYPE, VFIO_BASE + 16) > > +/* IOCTL for Shared Virtual Memory Bind */ > +struct vfio_device_svm { > + __u32 argsz; > +#define VFIO_SVM_BIND_PASIDTBL (1 << 0) /* Bind PASID Table */ > +#define VFIO_SVM_BIND_PASID (1 << 1) /* Bind PASID from userspace driver */ > +#define VFIO_SVM_BIND_PGTABLE (1 << 2) /* Bind guest mmu page table */ > + __u32 flags; > + __u32 length; > + __u8 data[]; > +}; > + > +#define VFIO_SVM_TYPE_MASK (VFIO_SVM_BIND_PASIDTBL | \ > + VFIO_SVM_BIND_PASID | \ > + VFIO_SVM_BIND_PGTABLE) > + > +#define VFIO_IOMMU_SVM_BIND_TASK _IO(VFIO_TYPE, VFIO_BASE + 22) This could be called "VFIO_IOMMU_SVM_BIND, since it will be used both to bind tables and individual tasks. Thanks, Jean
