linux-kernel - Re: [RFC PATCH v2 0/2] Eventfd signal on guest AP configuration change

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Message-ID: <e420953e-418b-4ea5-a561-015597a59d9e@linux.ibm.com>
Date: Wed, 26 Feb 2025 13:05:51 -0500
From: Rorie Reyes <rreyes@...ux.ibm.com>
To: linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc: hca@...ux.ibm.com, borntraeger@...ibm.com, agordeev@...ux.ibm.com,
        gor@...ux.ibm.com, pasic@...ux.ibm.com, jjherne@...ux.ibm.com,
        alex.williamson@...hat.com, akrowiak@...ux.ibm.com
Subject: Re: [RFC PATCH v2 0/2] Eventfd signal on guest AP configuration
 change


On 2/26/25 1:03 PM, Rorie Reyes wrote:
> Changelog:
>
> v2:
> - Fixing remove notification for AP configuration
>
> --------------------------------------------------------------------------
>
> The purpose of this patch is to provide immediate notification of changes
> made to a guest's AP configuration by the vfio_ap driver. This will enable
> the guest to take immediate action rather than relying on polling or some
> other inefficient mechanism to detect changes to its AP configuration.
>
> Note that there are corresponding QEMU patches that will be shipped along
> with this patch (see vfio-ap: Report vfio-ap configuration changes) that
> will pick up the eventfd signal.
>
> Rorie Reyes (2):
>    s390/vfio-ap: Signal eventfd when guest AP configuration is changed
>    s390/vfio-ap: Fixing mdev remove notification
>
>   drivers/s390/crypto/vfio_ap_ops.c     | 65 ++++++++++++++++++++++++++-
>   drivers/s390/crypto/vfio_ap_private.h |  2 +
>   include/uapi/linux/vfio.h             |  1 +
>   3 files changed, 67 insertions(+), 1 deletion(-)
>
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