Re: [PATCH] x86, microcode, AMD: Fix patch level reporting for family15h

[Suravee Suthikulpanit]

On 9/26/2013 6:06 PM, Andreas Herrmann wrote:
> On Fri, Sep 27, 2013 at 12:13:22AM +0200, Borislav Petkov wrote:
> > On Thu, Sep 26, 2013 at 04:54:32PM -0500, suravee.suthikulpanit@xxxxxxx wrote:
> > > From: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
> > >
> > > On AMD family15h, applying microcode patch on the a core (core0)
> > > would also affect the other core (core1) in the same compute unit.
> > > The driver would skip applying the patch on core1, but it still
> > > need to update kernel structures to reflect the proper patch level.
> > >
> > > The current logic is not updating the struct ucode_cpu_info.cpu_sig.rev
> > > of the skipped core. This causes the /sys/devices/system/cpu/cpu1/microcode/version
> > > to report incorrect patch level as shown below:
> > >
> > > [   10.708841] microcode: CPU0: new patch_level=0x0600063d
> > > [   10.714256] microcode: CPU1: patch_level=0x06000626
> > > [   10.719345] microcode: CPU2: patch_level=0x06000626
> > > [   10.748095] microcode: CPU2: new patch_level=0x0600063d
> > > [   10.753365] microcode: CPU3: patch_level=0x06000626
> > > [   10.758264] microcode: CPU4: patch_level=0x06000626
> > > [   10.786999] microcode: CPU4: new patch_level=0x0600063d
> > Actually, this is collect_cpu_info_amd()'s normal operation and shows
> > that there's no need to apply a microcode patch on the odd core since
> > the even core's ucode has been updated.
> Hmm, I think Boris is right, above messages are just logging what
> happened during Âcode update. I think the patch_level in "CPU1:
> patch_level=0x06000626" is based on c->microcode which is updated
> shortly after this message was printed.
>
> I assume with your patch, above message won't look different but just
> the contents in /sys/devices/system/cpu/cpu1/microcode/version will
> show the correct version, right?
>
>
> Andreas
Yes, the message in dmesg is still showing the same. Only the sysfs... 
version is now fixed.

Suravee

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