linux-kernel - Re: [PATCH 06/32] s390/airq: allow for airq structure that uses an input vector

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Date:   Wed, 8 Dec 2021 11:04:49 +0100
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,
        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, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/32] s390/airq: allow for airq structure that uses an
 input vector

On 07/12/2021 21.57, 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).
> 
> Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
> ---
[...]
> diff --git a/arch/s390/pci/pci_irq.c b/arch/s390/pci/pci_irq.c
> index 880bcd73f11a..dfd4f3276a6d 100644
> --- a/arch/s390/pci/pci_irq.c
> +++ b/arch/s390/pci/pci_irq.c
[...]
> @@ -443,7 +443,7 @@ static int __init zpci_directed_irq_init(void)
>   		zpci_ibv[cpu] = airq_iv_create(cache_line_size() * BITS_PER_BYTE,
>   					       AIRQ_IV_DATA |
>   					       AIRQ_IV_CACHELINE |
> -					       (!cpu ? AIRQ_IV_ALLOC : 0));
> +					(!cpu ? AIRQ_IV_ALLOC : 0), 0);

Nit: Indentation changed

> diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
> index 52c376d15978..ff84f45587be 100644
> --- a/drivers/s390/virtio/virtio_ccw.c
> +++ b/drivers/s390/virtio/virtio_ccw.c
> @@ -241,7 +241,7 @@ static struct airq_info *new_airq_info(int index)
>   		return NULL;
>   	rwlock_init(&info->lock);
>   	info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR
> -				   | AIRQ_IV_CACHELINE);
> +				| AIRQ_IV_CACHELINE, 0);

dito

>   	if (!info->aiv) {
>   		kfree(info);
>   		return NULL;
> 

  Thomas