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

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Date:   Mon, 16 May 2022 12:18:34 +0200
From:   Thomas Huth <thuth@...hat.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>, linux-s390@...r.kernel.org
Cc:     alex.williamson@...hat.com, cohuck@...hat.com,
        schnelle@...ux.ibm.com, farman@...ux.ibm.com, pmorel@...ux.ibm.com,
        borntraeger@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, frankja@...ux.ibm.com, david@...hat.com,
        imbrenda@...ux.ibm.com, vneethv@...ux.ibm.com,
        oberpar@...ux.ibm.com, freude@...ux.ibm.com, pasic@...ux.ibm.com,
        pbonzini@...hat.com, corbet@....net, jgg@...dia.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v7 06/22] s390/airq: allow for airq structure that uses an
 input vector

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