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

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Message-ID: <98318e6c-adcd-ddb8-ad92-e7c1fa771c84@jonmasters.org>
Date:   Sat, 9 Jun 2018 09:09:35 -0400
From:   Jon Masters <jcm@...masters.org>
To:     Marc Zyngier <marc.zyngier@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kvmarm@...ts.cs.columbia.edu
Cc:     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 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?

Jon.