linux-kernel - Re: [PATCH] x86, microcode: Remove unnecessary paravirt

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Message-ID: <20160211181749.GF5565@pd.tnic>
Date:	Thu, 11 Feb 2016 19:17:49 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	david.vrabel@...rix.com, konrad.wilk@...cle.com,
	xen-devel@...ts.xenproject.org
Subject: Re: [PATCH] x86, microcode: Remove unnecessary paravirt_enabled check

On Thu, Feb 11, 2016 at 10:13:18AM -0500, Boris Ostrovsky wrote:
> Commit a18a0f6850d4 ("x86, microcode: Don't initialize microcode code on
> paravirt") added a paravirt test in microcode_init(), primarily to avoid
> making mc_bp_resume()->load_ucode_ap()->check_loader_disabled_ap() calls
> On 32-bit kernels this callchain ends up using __pa_nodebug() macro
> which is invalid for Xen PV guests.
> 
> A subsequent commit, fbae4ba8c4a3 ("x86, microcode: Reload microcode on
> resume"), eliminated this callchain thus making a18a0f6850d4
> unnecessary.
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> ---
>  arch/x86/kernel/cpu/microcode/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied, thanks.

-- 
Regards/Gruss,
    Boris.

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