linux-kernel - Re: [PATCH] x86/umip: Downgrade warning messages to debug loglevel

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Message-ID: <YUyWNnzogxflFIwd@zn.tnic>
Date:   Thu, 23 Sep 2021 16:59:02 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Marcus Rückert <mrueckert@...e.com>
Subject: Re: [PATCH] x86/umip: Downgrade warning messages to debug loglevel

On Wed, Sep 15, 2021 at 05:27:35PM -0700, Ricardo Neri wrote:
> FWIW, Reviewed-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>

Thx.

So this thing is not completely quiet:

# dmesg -l err,warn,notice -x
...
kern  :notice: [   17.974749] random: dd: uninitialized urandom read (512 bytes read)
kern  :notice: [   18.063596] random: dbus-daemon: uninitialized urandom read (12 bytes read)
kern  :notice: [   18.065212] random: dbus-daemon: uninitialized urandom read (12 bytes read)
kern  :notice: [   20.161303] random: crng init done
kern  :warn  : [  144.505690] umip_printk: 403267 callbacks suppressed
^^^^^^^^^^^^^^^^

so at least it says that umip is being busy logging stuff and if one
wants to see them, one can do:

# dmesg -l err,warn,notice,debug -x
kern  :notice: [   17.974749] random: dd: uninitialized urandom read (512 bytes read)
kern  :notice: [   18.063596] random: dbus-daemon: uninitialized urandom read (12 bytes read)
kern  :notice: [   18.065212] random: dbus-daemon: uninitialized urandom read (12 bytes read)
kern  :notice: [   20.161303] random: crng init done
kern  :debug : [   24.501738] umip: sidt[1882] ip:5570e245a083 sp:7ffdbe080390: SIDT instruction cannot be used by applications.
kern  :debug : [   24.501743] umip: sidt[1882] ip:5570e245a083 sp:7ffdbe080390: For now, expensive software emulation returns the result.
kern  :debug : [   24.502566] umip: sidt[1883] ip:55c63b5ff083 sp:7fffde333160: SIDT instruction cannot be used by applications.
kern  :debug : [   24.502569] umip: sidt[1883] ip:55c63b5ff083 sp:7fffde333160: For now, expensive software emulation returns the result.
kern  :debug : [   24.503259] umip: sidt[1884] ip:55e4bff9e083 sp:7ffecb324530: SIDT instruction cannot be used by applications.
kern  :warn  : [  144.505690] umip_printk: 403267 callbacks suppressed
kern  :debug : [  144.505692] umip: sidt[9170] ip:560d1457f083 sp:7fff1d5d9df0: SIDT instruction cannot be used by applications.
kern  :debug : [  144.506484] umip: sidt[9170] ip:560d1457f083 sp:7fff1d5d9df0: For now, expensive software emulation returns the result.
kern  :debug : [  144.507218] umip: sidt[9171] ip:556f4549c083 sp:7ffc146ab2a0: SIDT instruction cannot be used by applications.
kern  :debug : [  144.507221] umip: sidt[9171] ip:556f4549c083 sp:7ffc146ab2a0: For now, expensive software emulation returns the result.
kern  :debug : [  144.507951] umip: sidt[9172] ip:55662fdd8083 sp:7ffefcdbc0d0: SIDT instruction cannot be used by applications.

ok, lemme queue it.

Thx.

-- 
Regards/Gruss,
    Boris.

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