linux-kernel - Re: Linux 3.18.2 / xen 4.4.1 dom0

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Message-ID: <20150122153002.GA3554@pd.tnic>
Date:	Thu, 22 Jan 2015 16:30:02 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:	James Dingwall <james@...gwall.me.uk>, linux-kernel@...r.kernel.org
Subject: Re: Linux 3.18.2 / xen 4.4.1 dom0 - microcode oops

On Thu, Jan 22, 2015 at 09:53:04AM -0500, Boris Ostrovsky wrote:
> Alternatively, we could return an error (-EINVAL?) from
> microcode_init() when either of these two conditions is true.

Yeah, this should be the right fix.

James, does that fix your issue? (It should.)

---
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 15c29096136b..36a83617eb21 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -552,7 +552,7 @@ static int __init microcode_init(void)
 	int error;
 
 	if (paravirt_enabled() || dis_ucode_ldr)
-		return 0;
+		return -EINVAL;
 
 	if (c->x86_vendor == X86_VENDOR_INTEL)
 		microcode_ops = init_intel_microcode();

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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