linux-kernel - Re: [PATCH 4/4] x86,module: Detect CRn and DRn manipulation

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Message-ID: <d6e9cc21-c848-1565-6868-4659ebfbec3a@siemens.com>
Date:   Wed, 8 Apr 2020 12:45:30 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     tglx@...utronix.de, linux-kernel@...r.kernel.org,
        hch@...radead.org, sean.j.christopherson@...el.com,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com, x86@...nel.org,
        kenny@...ix.com, jeyu@...nel.org, rasmus.villemoes@...vas.dk,
        fenghua.yu@...el.com, xiaoyao.li@...el.com, nadav.amit@...il.com,
        thellstrom@...are.com, tony.luck@...el.com,
        gregkh@...uxfoundation.org, jannh@...gle.com,
        keescook@...omium.org, David.Laight@...lab.com,
        dcovelli@...are.com, mhiramat@...nel.org,
        Wolfgang Mauerer <wolfgang.mauerer@...-regensburg.de>
Subject: Re: [PATCH 4/4] x86,module: Detect CRn and DRn manipulation

On 08.04.20 11:04, Paolo Bonzini wrote:
> On 08/04/20 10:58, Jan Kiszka wrote:
>>> Why not contribute the Jailhouse loader into Linux?
>>
>> Definitely planned. But right now it would add the burden of managing
>> the interface between loader and hypervisor carefully. Currently it is
>> internal to Jailhouse and maintained in lock-step, without any backward
>> compatibility.
> 
> How often does that change?

Not often, but right now we are at a critical point, starting to explore 
booting Jailhouse before Linux [1]. That may actually help to settle the 
interface and move things forward.

Another to-do is overcoming the need for having to map the hypervisor at 
a fixed location into the kernel address space. Not needed on arm64, 
still required on 32-bit ARM (well...) and x86 (more important). I would 
dislike pushing such legacy to upstream.

Jan

[1] 
https://www.mail-archive.com/jailhouse-dev@googlegroups.com/msg08389.html

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