linux-kernel - Re: Proposal: CAP_PAYLOAD to reduce Meltdown and Spectre mitigation costs

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Message-ID: <20180106200232.67387c5a@alans-desktop>
Date:   Sat, 6 Jan 2018 20:02:32 +0000
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     Avi Kivity <avi@...lladb.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Proposal: CAP_PAYLOAD to reduce Meltdown and Spectre mitigation
 costs

> I propose to create a new capability, CAP_PAYLOAD, that allows the 
> system administrator to designate an application as the main workload in 
> that system. Other processes (like sshd or monitoring daemons) exist to 
> support it, and so it makes sense to protect the rest of the system from 
> their being compromised.

Much more general would be to do this with cgroups both for group-group
trust and group-kernel trust levels.

Alan