linux-kernel - Re: [Qemu-devel] kvm_intel fails to load on Conroe CPUs running Linux 4.12

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Message-ID: <583438b7-4acc-5b66-0c7f-8a542b20495c@wiesinger.com>
Date:   Sun, 27 Aug 2017 16:59:11 +0200
From:   Gerhard Wiesinger <lists@...singer.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     "Kernel Mailing List, Linux" <linux-kernel@...r.kernel.org>,
        qemu-devel <qemu-devel@...gnu.org>
Subject: Re: [Qemu-devel] kvm_intel fails to load on Conroe CPUs running Linux
 4.12

On 27.08.2017 14:03, Paolo Bonzini wrote:
> Il 27 ago 2017 9:49 AM, "Gerhard Wiesinger" <lists@...singer.com> ha
> scritto:
>
> On 17.08.2017 23:14, Gerhard Wiesinger wrote:
>
>> On 17.08.2017 22:58, Gerhard Wiesinger wrote:
>>> On 07.08.2017 19:50, Paolo Bonzini wrote:
>>>
>>>> Not much to say, unfortunately. It's pretty much the same capabilities
>>>> as a Prescott/Cedar Mill processor, except that it has MSR bitmaps. It
>>>> also lacks FlexPriority compared to the Conroe I had checked.
>>>>
>>>> It's not great that even the revert patch doesn't apply cleanly---this
>>>> is *not* necessarily a boring area of the hypervisor...
>>>>
>>>> Given the rarity of your machine I'm currently leaning towards _not_
>>>> reverting the change. I'll check another non-Xeon Core 2 tomorrow that
>>>> is from December 2008 (IIRC). If that one also lacks vNMI, or if I get
>>>> other reports, I suppose I will have to reconsider that.
>> Hello Paolo,
>>
>> Can you please revert the patch.
>>
>> CPU is a Core 2 Extreme QX6700: SL9UL (B3) running VERY stable with ECC
>> RAM for years now.
>> https://ark.intel.com/products/28028/Intel-Core2-Extreme-
>> Processor-QX6700-8M-Cache-2_66-GHz-1066-MHz-FSB?q=Core%
>> 202%20Extreme%20QX6700
>> https://en.wikipedia.org/wiki/List_of_Intel_Core_2_microprocessors
>>
>> CPU details below.
>>
>> Thank you.
>>
>> Ciao,
>> Gerhard
>>
> Hello Paolo,
>
> Any update on this major issue?
>
>
> We will revert the patch, but 4.13.0 will not have the fix. Expect it in
> later stable kernels (because vacations).
Thnx. Why will 4.13.0 NOT have the fix?

Thnx.

Ciao,
Gerhard