linux-kernel - Re: [PATCH v5 2/2] drivers/virt: vmgenid: add vm generation id driver

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Message-ID: <20210209095350-mutt-send-email-mst@kernel.org>
Date:   Tue, 9 Feb 2021 09:55:32 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Adrian Catangiu <acatan@...zon.com>
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        qemu-devel@...gnu.org, kvm@...r.kernel.org,
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Subject: Re: [PATCH v5 2/2] drivers/virt: vmgenid: add vm generation id driver

> +The ``vmgenid`` driver uses ACPI events to be notified by hardware
> +changes to the 128-bit Vm Gen Id UUID.

That's ok, problem is ACPI event processing is asynchronous.
What we need is thus to flush out ACPI events whenever userspace
does a read, otherwise the value it gets will be stale.

-- 
MST