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Re: [Xen-devel] [PATCH v2] xen: Add acpu_sleep=s3_fake command-line option for testing
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Tue, 22 May 2018 15:50:51 +0100
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- Cc: Juergen Gross <JGross@xxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 22 May 2018 14:51:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 05/22/2018 03:43 PM, George Dunlap wrote:
> On 05/22/2018 03:37 PM, Andrew Cooper wrote:
>> On 22/05/18 14:48, George Dunlap wrote:
>>> On 05/22/2018 02:40 PM, Jan Beulich wrote:
>>>>>>> On 22.05.18 at 15:35, <george.dunlap@xxxxxxxxxx> wrote:
>>>>> --- a/xen/arch/x86/acpi/power.c
>>>>> +++ b/xen/arch/x86/acpi/power.c
>>>>> @@ -33,6 +33,8 @@
>>>>>
>>>>> uint32_t system_reset_counter = 1;
>>>>>
>>>>> +static bool __read_mostly opt_fake_s3 = false;
>>>> With the typo in the title (wants to be acpi_sleep) corrected
>>> Oops -- I can fix this on check-in (once the development window opens).
>>
>> If this patch is necessary, or at least a useful aid to track down an S3
>> bug in Xen 4.11, I vote for its inclusion.
>>
>> As far as the change itself goes, it is very simple, with a minimal
>> change of any unintended side effects.
>>
>> CC'ing the RM for his decision on the subject.
>
> Using `rtcwake -s 10 -m mem`, the only difference I've seen between
> suspend with this patch and without is that it doesn't actually sleep
> for 10 seconds -- not surprising, as it was never asleep. :-)
In fact, with `s3_fake` enabled, Xen just hangs when XPTI / BTI are
enabled; but with it disabled, I actually get a stack trace. Serial
output and xen-syms.map attached.
(The mail server doesn't seem to want the full xen-syms file -- let me
know if you need it and I'll figure out how to get it to you.)
-George
Attachment:
immortal-suspend-resume-serial.txt
Description: Text document
Attachment:
xen-syms.map
Description: Text document
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