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

Thomas Huth
2022-05-16T10:18:45Z

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@linux.ibm.com>
> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
> Acked-by: Cornelia Huck <cohuck@redhat.com>
> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> ---
> 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@redhat.com>