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

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Message-ID: <c51317cf-2026-22f8-6763-b3efd2c661d7@siemens.com>
Date:   Wed, 8 Apr 2020 13:13:17 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     David Laight <David.Laight@...LAB.COM>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hch@...radead.org" <hch@...radead.org>,
        "sean.j.christopherson@...el.com" <sean.j.christopherson@...el.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "hpa@...or.com" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "kenny@...ix.com" <kenny@...ix.com>,
        "jeyu@...nel.org" <jeyu@...nel.org>,
        "rasmus.villemoes@...vas.dk" <rasmus.villemoes@...vas.dk>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "fenghua.yu@...el.com" <fenghua.yu@...el.com>,
        "xiaoyao.li@...el.com" <xiaoyao.li@...el.com>,
        "nadav.amit@...il.com" <nadav.amit@...il.com>,
        "thellstrom@...are.com" <thellstrom@...are.com>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "jannh@...gle.com" <jannh@...gle.com>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "dcovelli@...are.com" <dcovelli@...are.com>,
        "mhiramat@...nel.org" <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 11:25, David Laight wrote:
> From: Jan Kiszka
>> Sent: 08 April 2020 09:59
> ...
>> At the risk of cutting our own branch off: That's not the firmware
>> loader, it's ioremap with PAGE_KERNEL_EXEC.
> 
> You could link the 'blob' into the .text part of a normal
> kernel module and then load that.

Sure, also possible. Was just more convenient so far to replace the 
hypervisor binary without having to recompile the driver module.

Jan

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