linux-kernel - Re: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs

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Message-ID: <20180213074738.nrohmtchyr6fddhm@gmail.com>
Date:   Tue, 13 Feb 2018 08:47:38 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     David Woodhouse <dwmw@...zon.co.uk>
Cc:     tglx@...utronix.de, x86@...nel.org, kvm@...r.kernel.org,
        torvalds@...ux-foundation.org, pbonzini@...hat.com,
        linux-kernel@...r.kernel.org, arjan.van.de.ven@...el.com,
        dave.hansen@...el.com
Subject: Re: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future
 CPUs


* David Woodhouse <dwmw@...zon.co.uk> wrote:

> +extern enum spectre_v2_mitigation spectre_v2_enabled;

This needs to be exported if the KVM module wants to use it.

> +static inline bool spectre_v2_ibrs_all(void)
> +{
> +	return spectre_v2_enabled == SPECTRE_V2_IBRS_ALL;
> +}

> +     if (vmx->spec_ctrl && !spectre_v2_ibrs_all())

> +	if (!spectre_v2_ibrs_all) {

erm, that's a function, not a flag ...

Thanks,

	Ingo