linux-kernel - Re: [PATCH v5 1/5] vfio: Add the device features for the low power entry and exit

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Date:   Tue, 26 Jul 2022 15:13:07 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Abhishek Sahu <abhsahu@...dia.com>,
        Alex Williamson <alex.williamson@...hat.com>
Cc:     Yishai Hadas <yishaih@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
        Kevin Tian <kevin.tian@...el.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Max Gurtovoy <mgurtovoy@...dia.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v5 1/5] vfio: Add the device features for the low power
 entry and exit

On Tue, Jul 26 2022, Abhishek Sahu <abhsahu@...dia.com> wrote:

>  #define VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY_WITH_WAKEUP 4
>  
>  /*
>   * Upon VFIO_DEVICE_FEATURE_SET, disallow use of device low power states as
>   * previously enabled via VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY or
>   * VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY_WITH_WAKEUP device features.
>   * This device feature IOCTL may itself generate a wakeup eventfd notification
>   * in the latter case if the device has previously entered a low power state.

Nit: s/has/had/

>   */
>  #define VFIO_DEVICE_FEATURE_LOW_POWER_EXIT 5

I haven't followed this closely, and I'm not that familiar with power
management, but at least I can't spot anything obviously problematic.