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RE: [PATCH v2 10/22] vfio/pci: set host iommu context to vIOMMU


From: Liu, Yi L
Subject: RE: [PATCH v2 10/22] vfio/pci: set host iommu context to vIOMMU
Date: Wed, 1 Apr 2020 03:20:40 +0000

Hi Eric´╝î

> From: Auger Eric <address@hidden>
> Sent: Tuesday, March 31, 2020 10:30 PM
> To: Liu, Yi L <address@hidden>; address@hidden;
> Subject: Re: [PATCH v2 10/22] vfio/pci: set host iommu context to vIOMMU
> 
> Yi,
> 
> On 3/30/20 6:24 AM, Liu Yi L wrote:
> > For vfio-pci devices, it could use pci_device_set/unset_iommu() to
> > expose host iommu context to vIOMMU emulators. vIOMMU emulators could
> > make use the methods provided by host iommu context. e.g.
> > propagate requests to host iommu.
> I think I would squash this patch into the previous one.

sure, I can make it. :-)

> >
> > Cc: Kevin Tian <address@hidden>
> > Cc: Jacob Pan <address@hidden>
> > Cc: Peter Xu <address@hidden>
> > Cc: Eric Auger <address@hidden>
> > Cc: Yi Sun <address@hidden>
> > Cc: David Gibson <address@hidden>
> > Cc: Alex Williamson <address@hidden>
> > Signed-off-by: Liu Yi L <address@hidden>
> > ---
> >  hw/vfio/pci.c | 13 +++++++++++++
> >  1 file changed, 13 insertions(+)
> >
> > diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 5e75a95..c140c88
> > 100644
> > --- a/hw/vfio/pci.c
> > +++ b/hw/vfio/pci.c
> > @@ -2717,6 +2717,7 @@ static void vfio_realize(PCIDevice *pdev, Error 
> > **errp)
> >      VFIOPCIDevice *vdev = PCI_VFIO(pdev);
> >      VFIODevice *vbasedev_iter;
> >      VFIOGroup *group;
> > +    VFIOContainer *container;
> >      char *tmp, *subsys, group_path[PATH_MAX], *group_name;
> >      Error *err = NULL;
> >      ssize_t len;
> > @@ -3028,6 +3029,11 @@ static void vfio_realize(PCIDevice *pdev, Error 
> > **errp)
> >      vfio_register_req_notifier(vdev);
> >      vfio_setup_resetfn_quirk(vdev);
> >
> > +    container = vdev->vbasedev.group->container;
> > +    if (container->iommu_ctx.initialized) {
> Sin't it possible to dynamically allocate the iommu_ctx so that you can 
> simply check
> container->iommu_ctx and discard the initialized field?

iommu_ctx is allocated along with container as it is not a pointer in 
VFIOContainer.
The only way to check it is to have flag. :-)

Regards,
Yi Liu



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