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Message-ID: <Y+FM+qRHLU6RSJ16@Asurada-Nvidia>
Date: Mon, 6 Feb 2023 10:54:50 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: "Tian, Kevin" <kevin.tian@...el.com>
CC: "jgg@...dia.com" <jgg@...dia.com>,
"joro@...tes.org" <joro@...tes.org>,
"will@...nel.org" <will@...nel.org>,
"robin.murphy@....com" <robin.murphy@....com>,
"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
"shuah@...nel.org" <shuah@...nel.org>,
"Liu, Yi L" <yi.l.liu@...el.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
"baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>
Subject: Re: [PATCH v1 8/8] vfio-iommufd: Support IO page table replacement
On Mon, Feb 06, 2023 at 08:49:16AM +0000, Tian, Kevin wrote:
> External email: Use caution opening links or attachments
>
>
> > From: Nicolin Chen <nicolinc@...dia.com>
> > Sent: Thursday, February 2, 2023 3:05 PM
> >
> > Remove the vdev->iommufd_attached check, since the kernel can internally
> > handle a replacement of the IO page table now.
> >
> > Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> > ---
> > drivers/vfio/iommufd.c | 3 ---
> > 1 file changed, 3 deletions(-)
> >
> > diff --git a/drivers/vfio/iommufd.c b/drivers/vfio/iommufd.c
> > index 7e09defbcffe..f9e89b3eef69 100644
> > --- a/drivers/vfio/iommufd.c
> > +++ b/drivers/vfio/iommufd.c
> > @@ -111,9 +111,6 @@ int vfio_iommufd_physical_attach_ioas(struct
> > vfio_device *vdev, u32 *pt_id)
> > return 0;
> > }
> >
> > - if (vdev->iommufd_attached)
> > - return -EBUSY;
> > -
> > rc = iommufd_device_attach(vdev->iommufd_device, pt_id);
> > if (rc)
> > return rc;
>
> also update vfio uapi description to explain the replace semantics.
Will add that. Thanks!
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