linux-kernel - Re: [PATCH 00/10] x86: Add support for running as secondary Jailhouse guest

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Message-ID: <6c61ceb7-e3fe-57a8-de50-e8f573d18cfd@zytor.com>
Date:   Sat, 18 Nov 2017 13:15:51 -0800
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Jan Kiszka <jan.kiszka@...mens.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>
Cc:     x86@...nel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        jailhouse-dev@...glegroups.com
Subject: Re: [PATCH 00/10] x86: Add support for running as secondary Jailhouse
 guest

On 11/15/17 23:26, Jan Kiszka wrote:
> This series paves the way to run Linux in so-called non-root cells
> (guest partitions) of the Jailhouse hypervisor.
> 
> Jailhouse [1] was started 4 years ago as an open-source (GPL) leight-
> weight hypervisor that statically partitions SMP systems. It's unique in
> that it uses one Linux instance, the root cell, as boot loader and
> management console. Jailhouse targets use cases for hard real-time and
> safety-critical systems that KVM cannot cater due to its inherent
> complexity.
> 
> Jaihouse can run bare-metal, free and closed-source RTOSes as secondary
> guests and, with this series, also x86 Linux instances. While ARM and
> ARM64 non-root Linux guests are feasible without extra patches, thanks
> to the high configurability via device trees, x86 requires special
> platform support, mostly to step away from non-existing resources in a
> non-root Jailhouse cell.
> 

Could you please write a single summary about the virtualization holes
in Jailhouse that you are papering over?

	-hpa