Re: [PATCH v3 11/23] iommufd/viommu: Add IOMMUFD_CMD_VQUEUE_ALLOC ioctl

On Wed, May 07, 2025 at 01:11:43PM +0530, Vasant Hegde wrote:

• MMIO Offset 0018h IOMMU Control Register EventLogEn: Event log enable

  • When guest sets this bit, qemu will trap and will send queue_alloc
  • When guest disables this bit, qemu will trap and send vqueue_destroy

  This part is fine.

Ok

 EventIntEn: Event log interrupt enable
   * When guest sets this bit, qemu will trap
   * this needs to be communicated to Host so that we can program VF Control

BAR and enable the interrupt

This sounds like modifying the vqueue? Or maybe on the viommu?

• There is other bit "Completion wait interrupt enable" This doesn't related to any buffer. Instead if we configure this for

completion wait command it will generate interrupt.

This sounds like a modify on the VIOMMU object?

Jason