linux-kernel - Re: [PATCH 1/1] vmgenid: emit uevent when VMGENID updates

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Message-ID: <38b2d1b4-9a26-c6a3-cf8b-af5b3dcf5a9b@amazon.de>
Date:   Mon, 19 Jun 2023 11:14:06 +0200
From:   Alexander Graf <graf@...zon.de>
To:     Babis Chalios <bchalios@...zon.es>, Theodore Ts'o <tytso@....edu>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        <linux-kernel@...r.kernel.org>
CC:     <mzxreary@...inter.de>, <xmarcalx@...zon.co.uk>,
        Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 1/1] vmgenid: emit uevent when VMGENID updates

On 31.05.23 11:51, Babis Chalios wrote:
> We receive an ACPI notification every time the VM Generation ID changes
> and use the new ID as fresh randomness added to the entropy pool. This
> commits emits a uevent every time we receive the ACPI notification, as a
> means to notify the user space that it now is in a new VM.
>
> Signed-off-by: Babis Chalios <bchalios@...zon.es>

Thanks Babis! Super simple, yet very effective way to notify system 
software that it may need to adopt to a new environment. I know that the 
systemd folks are super interested in that to for example regenerate 
randomly generated MAC addresses after a clone operation.

Reviewed-by: Alexander Graf <graf@...zon.com>

Alex

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