linux-kernel - Re: [PATCH v2] x86/pti: don't report XenPV as vulnerable

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Message-ID: <457f3e13-12e6-ed2f-5165-e413801a2172@suse.com>
Date:   Mon, 18 Jun 2018 10:07:49 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...e.de>,
        Mike Latimer <mlatimer@...e.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] x86/pti: don't report XenPV as vulnerable

On 18/06/18 09:59, Jiri Kosina wrote:
> From: Jiri Kosina <jkosina@...e.cz>
> 
> Xen PV domain kernel is not by design affected by meltdown as it's 
> enforcing split CR3 itself. Let's not report such systems as "Vulnerable" 
> in sysfs (we're also already forcing PTI to off in X86_HYPER_XEN_PV 
> cases); the security of the system ultimately depends on presence of 
> mitigation in Hypervisor, which can't be easily detected from DomU; let's 
> report that.
> 
> Reported-and-tested-by: Mike Latimer <mlatimer@...e.com>
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>

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


Juergen