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From:   Cornelia Huck <cohuck@redhat.com>
To:     Matthew Rosato <mjrosato@linux.ibm.com>, linux-s390@vger.kernel.org
Cc:     alex.williamson@redhat.com, schnelle@linux.ibm.com,
        farman@linux.ibm.com, pmorel@linux.ibm.com,
        borntraeger@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com,
        gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com,
        frankja@linux.ibm.com, david@redhat.com, imbrenda@linux.ibm.com,
        vneethv@linux.ibm.com, oberpar@linux.ibm.com, freude@linux.ibm.com,
        thuth@redhat.com, pasic@linux.ibm.com, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 06/30] s390/airq: allow for airq structure that uses
 an input vector
In-Reply-To: <20220204211536.321475-7-mjrosato@linux.ibm.com>
Organization: Red Hat GmbH
References: <20220204211536.321475-1-mjrosato@linux.ibm.com>
 <20220204211536.321475-7-mjrosato@linux.ibm.com>
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Date:   Mon, 07 Feb 2022 09:29:44 +0100
Message-ID: <87fsovw03r.fsf@redhat.com>
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On Fri, Feb 04 2022, Matthew Rosato <mjrosato@linux.ibm.com> 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>
> 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(-)

For virtio-ccw:

Acked-by: Cornelia Huck <cohuck@redhat.com>