linux-kernel - Re: [PATCH v2 00/16] arm64: Add SMCCC v1.1 support and CVE-2017-5715 (Spectre variant 2) mitigation

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Date:   Sat, 09 Jun 2018 15:06:41 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Jon Masters <jcm@...masters.org>
Cc:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Peter Maydell <peter.maydell@...aro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Mark Rutland <mark.rutland@....com>,
        Robin Murphy <robin.murphy@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Jon Masters <jcm@...hat.com>, christoffer.dall@....com
Subject: Re: [PATCH v2 00/16] arm64: Add SMCCC v1.1 support and CVE-2017-5715 (Spectre variant 2) mitigation

Hi Jon,

On Sat, 09 Jun 2018 14:22:27 +0100,
Jon Masters wrote:
> 
> Hi Marc,
> 
> On 01/29/2018 12:45 PM, Marc Zyngier wrote:
> 
> > ARM has recently published a SMC Calling Convention (SMCCC)
> > specification update[1] that provides an optimised calling convention
> > and optional, discoverable support for mitigating CVE-2017-5715. ARM
> > Trusted Firmware (ATF) has already gained such an implementation[2].
> 
> Some questions:
> 
> 1). What's the plan to implement the boot time on/off control for
> spectre_v2 mitigations?

None so far. It can only be disabled at compile time.

> 2). What's the plan to handle live migration of VMs?

[I assume that by "migration of VMs, you actually mean migration of
the mitigation state]

As I mentioned in response to your comment on the variant-4 series,
this is a work in progress, and is mentioned in the cover letter of
that series. Hopefully I'll find time to work on it next week.

	M.

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