linux-kernel - Re: [patch 25/60] x86/paravirt: Provide a way to check for hypervisors

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Date:   Tue, 5 Dec 2017 13:19:29 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirsky <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Borislav Petkov <bpetkov@...e.de>,
        Greg KH <gregkh@...uxfoundation.org>, keescook@...gle.com,
        hughd@...gle.com, Brian Gerst <brgerst@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        David Laight <David.Laight@...lab.com>,
        Eduardo Valentin <eduval@...zon.com>, aliguori@...zon.com,
        Will Deacon <will.deacon@....com>, daniel.gruss@...k.tugraz.at
Subject: Re: [patch 25/60] x86/paravirt: Provide a way to check for
 hypervisors

On 04/12/17 15:07, Thomas Gleixner wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> There is no generic way to test whether a kernel is running on a specific
> hypervisor. But that's required to prevent the upcoming user address space
> separation feature in certain guest modes.
> 
> Make the hypervisor type enum unconditionally available and provide a
> helper function which allows to test for a specific type.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen