linux-kernel - Re: [Xen-devel] Can't boot as Xen dom0 due to commit fe055896

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Date:   Thu, 15 Dec 2016 18:14:22 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Andrew Cooper <andrew.cooper3@...rix.com>
Cc:     Jan Beulich <JBeulich@...e.com>, Juergen Gross <JGross@...e.com>,
        xen-devel <xen-devel@...ts.xenproject.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] Can't boot as Xen dom0 due to commit fe055896

On Thu, Dec 15, 2016 at 04:59:49PM +0000, Andrew Cooper wrote:
> Xen has the same logic as Linux does to look for an uncompressed
> microcode blob in the initrd and apply it early in boot.
> 
> If dom0 goes looking, it should see the same microcode version as it has
> in its initrd.

So it sounds to me like I wanna do this:

---
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index dd47e60aabf5..e238119b5dff 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1202,6 +1202,7 @@ config X86_REBOOTFIXUPS
 config MICROCODE
 	bool "CPU microcode loading support"
 	default y
+	depends on !XEN
 	depends on CPU_SUP_AMD || CPU_SUP_INTEL
 	select FW_LOADER
 	---help---
--

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--