On Tue, Apr 26, 2022 at 02:59:31PM -0600, Alex Williamson wrote:
> > The best you could do is make a dummy IOAS then attach the device,
> > read the mappings, detatch, and then do your unmaps.
>
> Right, the same thing the kernel does currently.
>
> > I'm imagining something like IOMMUFD_DEVICE_
On Tue, 26 Apr 2022 16:27:03 -0300
Jason Gunthorpe wrote:
> On Tue, Apr 26, 2022 at 12:45:41PM -0600, Alex Williamson wrote:
> > On Tue, 26 Apr 2022 11:11:56 -0300
> > Jason Gunthorpe wrote:
> >
> > > On Tue, Apr 26, 2022 at 10:08:30PM +0800, Yi Liu wrote:
> > >
> > > > > I think it is str
On Tue, Apr 26, 2022 at 12:45:41PM -0600, Alex Williamson wrote:
> On Tue, 26 Apr 2022 11:11:56 -0300
> Jason Gunthorpe wrote:
>
> > On Tue, Apr 26, 2022 at 10:08:30PM +0800, Yi Liu wrote:
> >
> > > > I think it is strange that the allowed DMA a guest can do depends on
> > > > the order how devi
On Tue, 26 Apr 2022 11:11:56 -0300
Jason Gunthorpe wrote:
> On Tue, Apr 26, 2022 at 10:08:30PM +0800, Yi Liu wrote:
>
> > > I think it is strange that the allowed DMA a guest can do depends on
> > > the order how devices are plugged into the guest, and varys from
> > > device to device?
> > >
>
On Tue, Apr 26, 2022 at 10:08:30PM +0800, Yi Liu wrote:
> > I think it is strange that the allowed DMA a guest can do depends on
> > the order how devices are plugged into the guest, and varys from
> > device to device?
> >
> > IMHO it would be nicer if qemu would be able to read the new reserved
On 2022/4/26 21:41, Jason Gunthorpe wrote:
On Tue, Apr 26, 2022 at 10:41:01AM +, Tian, Kevin wrote:
That's one case of incompatibility, but the IOMMU attach group callback
can fail in a variety of ways. One that we've seen that is not
uncommon is that we might have an mdev container with
On Tue, Apr 26, 2022 at 05:55:29PM +0800, Yi Liu wrote:
> > I also suggest falling back to using "/dev/char/%u:%u" if the above
> > does not exist which prevents "vfio/devices/vfio" from turning into
> > ABI.
>
> do you mean there is no matched file under /dev/vfio/devices/? Is this
> possible?
T
On Tue, Apr 26, 2022 at 10:41:01AM +, Tian, Kevin wrote:
> That's one case of incompatibility, but the IOMMU attach group callback
> can fail in a variety of ways. One that we've seen that is not
> uncommon is that we might have an mdev container with various mappings
> to other devices.
> From: Liu, Yi L
> Sent: Tuesday, April 26, 2022 5:55 PM
> On 2022/4/22 22:58, Jason Gunthorpe wrote:
> > On Thu, Apr 14, 2022 at 03:47:07AM -0700, Yi Liu wrote:
> >
> >> +
> >> +/* try to attach to an existing container in this space */
> >> +QLIST_FOREACH(bcontainer, &space->containers,
Hi Jason,
On 2022/4/22 22:58, Jason Gunthorpe wrote:
On Thu, Apr 14, 2022 at 03:47:07AM -0700, Yi Liu wrote:
+static int vfio_get_devicefd(const char *sysfs_path, Error **errp)
+{
+long int vfio_id = -1, ret = -ENOTTY;
+char *path, *tmp = NULL;
+DIR *dir;
+struct dirent *dent;
On Fri, 22 Apr 2022 11:58:15 -0300
Jason Gunthorpe wrote:
>
> I don't see IOMMU_IOAS_IOVA_RANGES called at all, that seems like a
> problem..
Not as much as you might think. Note that you also won't find QEMU
testing VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE in the QEMU vfio-pci
driver either. The
On Thu, Apr 14, 2022 at 03:47:07AM -0700, Yi Liu wrote:
> +static int vfio_get_devicefd(const char *sysfs_path, Error **errp)
> +{
> +long int vfio_id = -1, ret = -ENOTTY;
> +char *path, *tmp = NULL;
> +DIR *dir;
> +struct dirent *dent;
> +struct stat st;
> +gchar *contents
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