Messages in this thread | | | Subject | Re: [PATCH v10 11/11] vfio: Document nested stage control | From | Zenghui Yu <> | Date | Thu, 24 Sep 2020 21:42:10 +0800 |
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Hi Eric,
On 2020/3/21 0:19, Eric Auger wrote: > The VFIO API was enhanced to support nested stage control: a bunch of > new iotcls, one DMA FAULT region and an associated specific IRQ. > > Let's document the process to follow to set up nested mode. > > Signed-off-by: Eric Auger <eric.auger@redhat.com>
[...]
> +The userspace must be prepared to receive faults. The VFIO-PCI device > +exposes one dedicated DMA FAULT region: it contains a ring buffer and > +its header that allows to manage the head/tail indices. The region is > +identified by the following index/subindex: > +- VFIO_REGION_TYPE_NESTED/VFIO_REGION_SUBTYPE_NESTED_DMA_FAULT > + > +The DMA FAULT region exposes a VFIO_REGION_INFO_CAP_PRODUCER_FAULT > +region capability that allows the userspace to retrieve the ABI version > +of the fault records filled by the host.
Nit: I don't see this capability in the code.
Thanks, Zenghui
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