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@xxxxxxxxxx>
[...]
+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 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
