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Re: [PATCH] x86/x2apic: introduce a mixed physical/cluster mode
- To: Elliott Mitchell <ehem+xen@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 4 Dec 2023 09:03:20 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Henry Wang <Henry.Wang@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Neowutran <xen@xxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 04 Dec 2023 08:03:28 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.12.2023 02:02, Elliott Mitchell wrote:
> On Mon, Nov 27, 2023 at 09:27:18AM +0100, Roger Pau Monn
>> On Fri, Nov 24, 2023 at 05:15:34PM -0800, Elliott Mitchell wrote:
>>> On Thu, Nov 23, 2023 at 10:39:37AM +0100, Roger Pau Monn
>>>> On Tue, Nov 21, 2023 at 04:56:47PM -0800, Elliott Mitchell wrote:
>>>>> It was insisted that full logs be sent to xen-devel. Perhaps I am
>>>>> paranoid, but I doubt I would have been successful at scrubbing all
>>>>> hardware serial numbers. As such, I was willing to post substantial
>>>>> sections, but not everything.
>>>>
>>>> Can you please point out which hardware serial numbers are you
>>>> referring to, and where are they printed in Xen dmesg?
>>>
>>> I didn't confirm the presence of hardware serial numbers getting into
>>> Xen's dmesg, but there was a lot of data and many hexadecimal numbers.
>>> With 4000 lines of output, checking for concerning data is troublesome.
>>
>> 4000 lines of output from Xen dmesg seems quite suspicious. Xen dmesg
>> on a fully booted box is ~400 lines on my local box. That might get
>> quite longer if you have a box with a lot of memory region, or a lot
>> of CPUs.
>
> That was from 4 boots with differing settings. Since it was full console
> log, it also had the initial Linux kernel boot messages. Each log was
> ~1000 lines.
>
>>> There was enough for alarms to trigger.
>>
>> That's fine, but without pointing out which information is sensitive,
>> it's very unlikely such concerns will ever get fixed.
>>
>> Could you at least go over the log and point out the first instance of
>> such line that you consider contains sensitive information?
>
> I would have been more comfortable with getting some guidance on which
> portions were desired or which could be left out. No need for Linux's
> boot messages, what would cut things down by half. No need for the
> memory map, lots more goes.
I didn't think "xl dmesg" spit out any Dom0 kernel messages by default.
Jan
> It is easier to be comfortable with 40 line sections than 1000 line
> sections.
>
>
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