On Tue, Jul 16, 2019 at 10:25:55AM +0000, Liu, Yi L wrote: > > From: kvm-owner@xxxxxxxxxxxxxxx [mailto:kvm-owner@xxxxxxxxxxxxxxx] On Behalf > > Of David Gibson > > Sent: Monday, July 15, 2019 10:55 AM > > To: Liu, Yi L <yi.l.liu@xxxxxxxxx> > > Subject: Re: [RFC v1 05/18] vfio/pci: add pasid alloc/free implementation > > > > On Fri, Jul 05, 2019 at 07:01:38PM +0800, Liu Yi L wrote: > > > This patch adds vfio implementation PCIPASIDOps.alloc_pasid/free_pasid(). > > > These two functions are used to propagate guest pasid allocation and > > > free requests to host via vfio container ioctl. > > > > As I said in an earlier comment, I think doing this on the device is > > conceptually incorrect. I think we need an explcit notion of an SVM > > context (i.e. the namespace in which all the PASIDs live) - which will > > IIUC usually be shared amongst multiple devices. The create and free > > PASID requests should be on that object. > > Actually, the allocation is not doing on this device. System wide, it is > done on a container. So not sure if it is the API interface gives you a > sense that this is done on device. Sorry, I should have been clearer. I can see that at the VFIO level it is done on the container. However the function here takes a bus and devfn, so this qemu internal interface is per-device, which doesn't really make sense. > Also, curious on the SVM context > concept, do you mean it a per-VM context or a per-SVM usage context? > May you elaborate a little more. :-) Sorry, I'm struggling to find a good term for this. By "context" I mean a namespace containing a bunch of PASID address spaces, those PASIDs are then visible to some group of devices. > > Thanks, > Yi Liu > > > > > > > Cc: Kevin Tian <kevin.tian@xxxxxxxxx> > > > Cc: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx> > > > Cc: Peter Xu <peterx@xxxxxxxxxx> > > > Cc: Eric Auger <eric.auger@xxxxxxxxxx> > > > Cc: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx> > > > Cc: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx> > > > Signed-off-by: Liu Yi L <yi.l.liu@xxxxxxxxx> > > > Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx> > > > --- > > > hw/vfio/pci.c | 61 > > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > > 1 file changed, 61 insertions(+) > > > > > > diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c > > > index ce3fe96..ab184ad 100644 > > > --- a/hw/vfio/pci.c > > > +++ b/hw/vfio/pci.c > > > @@ -2690,6 +2690,65 @@ static void vfio_unregister_req_notifier(VFIOPCIDevice > > *vdev) > > > vdev->req_enabled = false; > > > } > > > > > > +static int vfio_pci_device_request_pasid_alloc(PCIBus *bus, > > > + int32_t devfn, > > > + uint32_t min_pasid, > > > + uint32_t max_pasid) > > > +{ > > > + PCIDevice *pdev = bus->devices[devfn]; > > > + VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev); > > > + VFIOContainer *container = vdev->vbasedev.group->container; > > > + struct vfio_iommu_type1_pasid_request req; > > > + unsigned long argsz; > > > + int pasid; > > > + > > > + argsz = sizeof(req); > > > + req.argsz = argsz; > > > + req.flag = VFIO_IOMMU_PASID_ALLOC; > > > + req.min_pasid = min_pasid; > > > + req.max_pasid = max_pasid; > > > + > > > + rcu_read_lock(); > > > + pasid = ioctl(container->fd, VFIO_IOMMU_PASID_REQUEST, &req); > > > + if (pasid < 0) { > > > + error_report("vfio_pci_device_request_pasid_alloc:" > > > + " request failed, contanier: %p", container); > > > + } > > > + rcu_read_unlock(); > > > + return pasid; > > > +} > > > + > > > +static int vfio_pci_device_request_pasid_free(PCIBus *bus, > > > + int32_t devfn, > > > + uint32_t pasid) > > > +{ > > > + PCIDevice *pdev = bus->devices[devfn]; > > > + VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev); > > > + VFIOContainer *container = vdev->vbasedev.group->container; > > > + struct vfio_iommu_type1_pasid_request req; > > > + unsigned long argsz; > > > + int ret = 0; > > > + > > > + argsz = sizeof(req); > > > + req.argsz = argsz; > > > + req.flag = VFIO_IOMMU_PASID_FREE; > > > + req.pasid = pasid; > > > + > > > + rcu_read_lock(); > > > + ret = ioctl(container->fd, VFIO_IOMMU_PASID_REQUEST, &req); > > > + if (ret != 0) { > > > + error_report("vfio_pci_device_request_pasid_free:" > > > + " request failed, contanier: %p", container); > > > + } > > > + rcu_read_unlock(); > > > + return ret; > > > +} > > > + > > > +static PCIPASIDOps vfio_pci_pasid_ops = { > > > + .alloc_pasid = vfio_pci_device_request_pasid_alloc, > > > + .free_pasid = vfio_pci_device_request_pasid_free, > > > +}; > > > + > > > static void vfio_realize(PCIDevice *pdev, Error **errp) > > > { > > > VFIOPCIDevice *vdev = PCI_VFIO(pdev); > > > @@ -2991,6 +3050,8 @@ static void vfio_realize(PCIDevice *pdev, Error **errp) > > > vfio_register_req_notifier(vdev); > > > vfio_setup_resetfn_quirk(vdev); > > > > > > + pci_setup_pasid_ops(pdev, &vfio_pci_pasid_ops); > > > + > > > return; > > > > > > out_teardown: > > > -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson
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