linux-kernel - Re: [PATCH v2 12/17] arm64: KVM: Add ARCH_WORKAROUND

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Message-ID: <86tvqc8590.wl-marc.zyngier@arm.com>
Date:   Sat, 09 Jun 2018 14:21:47 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Jon Masters <jcm@...masters.org>
Cc:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kvmarm@...ts.cs.columbia.edu>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christoffer Dall <christoffer.dall@....com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Julien Grall <julien.grall@....com>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v2 12/17] arm64: KVM: Add ARCH_WORKAROUND_2 support for guests

On Sat, 09 Jun 2018 14:09:35 +0100,
Jon Masters wrote:
> 
> On 05/29/2018 08:11 AM, Marc Zyngier wrote:
> > In order to offer ARCH_WORKAROUND_2 support to guests, we need
> > a bit of infrastructure.
> > 
> > Let's add a flag indicating whether or not the guest uses
> > SSBD mitigation. Depending on the state of this flag, allow
> > KVM to disable ARCH_WORKAROUND_2 before entering the guest,
> > and enable it when exiting it.
> 
> ...Live migration?

Work in progress.

	M.

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