Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Sat, 09 Jun 2018 14:21:47 +0100
Message-ID: <86tvqc8590.wl-marc.zyngier@arm.com>
From:   Marc Zyngier <marc.zyngier@arm.com>
To:     Jon Masters <jcm@jonmasters.org>
Cc:     <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <kvmarm@lists.cs.columbia.edu>,
        Will Deacon <will.deacon@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andy Lutomirski <luto@kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Christoffer Dall <christoffer.dall@arm.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Dominik Brodowski <linux@dominikbrodowski.net>,
        Julien Grall <julien.grall@arm.com>,
        Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH v2 12/17] arm64: KVM: Add ARCH_WORKAROUND_2 support for guests
In-Reply-To: <98318e6c-adcd-ddb8-ad92-e7c1fa771c84@jonmasters.org>
References: <20180529121121.24927-1-marc.zyngier@arm.com>
        <20180529121121.24927-13-marc.zyngier@arm.com>
        <98318e6c-adcd-ddb8-ad92-e7c1fa771c84@jonmasters.org>
User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue)
 FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 EasyPG/1.0.0 Emacs/25.1
 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO)
Organization: ARM Ltd
MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue")
Content-Type: text/plain; charset=US-ASCII
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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.

-- 
Jazz is not dead, it just smell funny.