linux-kernel - Re: [PATCH v1 4/6] vfio-pci/zdev: Setup a zpci memory region for error information

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Message-ID: <20250813143028.1eb08bea.alex.williamson@redhat.com>
Date: Wed, 13 Aug 2025 14:30:28 -0600
From: Alex Williamson <alex.williamson@...hat.com>
To: Farhan Ali <alifm@...ux.ibm.com>
Cc: linux-s390@...r.kernel.org, kvm@...r.kernel.org,
 linux-kernel@...r.kernel.org, schnelle@...ux.ibm.com,
 mjrosato@...ux.ibm.com
Subject: Re: [PATCH v1 4/6] vfio-pci/zdev: Setup a zpci memory region for
 error information

On Wed, 13 Aug 2025 10:08:18 -0700
Farhan Ali <alifm@...ux.ibm.com> wrote:
> diff --git a/include/uapi/linux/vfio_zdev.h b/include/uapi/linux/vfio_zdev.h
> index 77f2aff1f27e..bcd06f334a42 100644
> --- a/include/uapi/linux/vfio_zdev.h
> +++ b/include/uapi/linux/vfio_zdev.h
> @@ -82,4 +82,9 @@ struct vfio_device_info_cap_zpci_pfip {
>  	__u8 pfip[];
>  };
>  
> +struct vfio_device_zpci_err_region {
> +	__u16 pec;
> +	int pending_errors;
> +};
> +
>  #endif

If this is uapi it would hopefully include some description, but if
this is the extent of what can be read from the device specific region,
why not just return it via a DEVICE_FEATURE ioctl?  Thanks,

Alex