Re: [Xen-devel] [PATCH] x86/XPTI: fix S3 resume (and CPU offlining in general)

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 24.05.18 at 16:24, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 24/05/18 15:22, Jan Beulich wrote:
>>>>> On 24.05.18 at 16:18, <andrew.cooper3@xxxxxxxxxx> wrote:
>>> Can you try with the "x86/traps: Dump the instruction stream even for
>>> double faults" patch I've just posted, and show the full #DF panic log
>>> please?  (Its conceivable that there are multiple different issues here.)
>> Well, as long as we're on a guest kernel stack rather than our own, I
>> don't think the exact insn causing the #DF really matters. See earlier
>> mails I have sent in this regard.
> 
> In George's crash, we were in a weird place on the hypervisor stack, not
> a guest stack...

Go look again - %rsp pointed outside of hypervisor space in all cases that
I had looked at. And that's explained by the unmapping of the stubs: We'd
#PF right after first SYSCALL, and the handler would then run on the stack
that's still active from guest context.

Jan



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