Re: [PATCH v7 06/22] s390/airq: allow for airq structure that uses an input vector

[Thomas Huth]

On 13/05/2022 21.14, Matthew Rosato wrote:
> When doing device passthrough where interrupts are being forwarded from
> host to guest, we wish to use a pinned section of guest memory as the
> vector (the same memory used by the guest as the vector). To accomplish
> this, add a new parameter for airq_iv_create which allows passing an
> existing vector to be used instead of allocating a new one. The caller
> is responsible for ensuring the vector is pinned in memory as well as for
> unpinning the memory when the vector is no longer needed.
>
> A subsequent patch will use this new parameter for zPCI interpretation.
>
> Reviewed-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
> Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
> Acked-by: Cornelia Huck <cohuck@xxxxxxxxxx>
> Signed-off-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
> ---
>   arch/s390/include/asm/airq.h     |  4 +++-
>   arch/s390/pci/pci_irq.c          |  8 ++++----
>   drivers/s390/cio/airq.c          | 10 +++++++---
>   drivers/s390/virtio/virtio_ccw.c |  2 +-
>   4 files changed, 15 insertions(+), 9 deletions(-)

Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>