linux-kernel - Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address

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Message-ID: <f9a50117-b404-da6f-e54a-f8b40e765c1b@oracle.com>
Date:   Mon, 19 Dec 2016 13:12:25 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by
 virtual address

On 12/19/2016 01:07 PM, Borislav Petkov wrote:
> On Mon, Dec 19, 2016 at 05:40:27PM +0100, Borislav Petkov wrote:
>> On Mon, Dec 19, 2016 at 11:10:29AM -0500, Boris Ostrovsky wrote:
>>> config attached. I'll see how I can get you the initrd.
>> Wait a bit, lemme see if I can repro with my initrd here.
> Hmm, it boots here (btw, this is with the 4 patches applied).
>
> [    0.000000] Linux version 4.9.0upstream-11409-gf3302378ed83-dirty (boris@pd) (gcc version 6.2.1 20161124 (Debian 6.2.1-5) ) #1 SMP Mon Dec 19 18:50:17 CET 2016
> [    0.000000] x86/fpu: Legacy x87 FPU detected.
> [    0.000000] e820: BIOS-provided physical RAM map:
> ...
> [    0.000000] RAMDISK: [mem 0x37845000-0x37c19fff]
> [    0.000000] Allocated new RAMDISK: [mem 0x36470000-0x36844f5e]
> [    0.000000] Move RAMDISK from [mem 0x37845000-0x37c19f5e] to [mem 0x36470000-0x36844f5e]
> ...
> [    0.243326] smpboot: CPU0: AMD E-350 Processor (family: 0x14, model: 0x1, stepping: 0x0)

IIUIC find_microcode_in_initrd() is called with paging on only on Intel
(which is where I observed it).


> [    0.243637] Performance Events: AMD PMU driver.
> ...
> [    1.307957] microcode: microcode updated early to new patch_level=0x05000029
> [    1.308212] microcode: CPU0: patch_level=0x05000029
> [    1.308374] microcode: CPU1: patch_level=0x05000029
> [    1.308726] microcode: Microcode Update Driver: v2.2.
>
> $ uname -a
> Linux x1 4.9.0upstream-11409-gf3302378ed83-dirty #1 SMP Mon Dec 19 18:50:17 CET 2016 i686 GNU/Linux
>
> So I guess I wanna take a look at the initrd now...


It'll have to wait until (my) evening, I'll ping you then.


-boris