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Re: [PATCH] cpu: Add starts_halted() method
From: |
Eduardo Habkost |
Subject: |
Re: [PATCH] cpu: Add starts_halted() method |
Date: |
Fri, 10 Jul 2020 16:17:52 -0400 |
On Fri, Jul 10, 2020 at 05:02:38PM -0300, Thiago Jung Bauermann wrote:
>
> Philippe Mathieu-Daudé <philmd@redhat.com> writes:
>
> > On 7/9/20 5:26 AM, Thiago Jung Bauermann wrote:
> >>
> >> Thiago Jung Bauermann <bauerman@linux.ibm.com> writes:
> >>
> >>> I'm seeing the vcpu being KVM_RUN'd too early twice during hotplug.
> >>> Both of them are before cpu_reset() and ppc_cpu_reset().
> >>
> >> Hm, rereading the message obviously the above is partially wrong. The
> >> second case happens during ppc_cpu_reset().
> >>
> >>> Here's the second:
> >>>
> >>> #0 in qemu_cpu_kick_thread ()
> >>> #1 in qemu_cpu_kick ()
> >>> #2 in queue_work_on_cpu ()
> >>> #3 in async_run_on_cpu ()
> >>> #4 in tlb_flush_by_mmuidx ()
> >>> #5 in tlb_flush ()
> >>> #6 in ppc_tlb_invalidate_all ()
> >>> #7 in ppc_cpu_reset ()
> >>> #8 in device_transitional_reset ()
> >>> #9 in resettable_phase_hold ()
> >>> #10 in resettable_assert_reset ()
> >>> #11 in device_set_realized ()
> >
> > Dunno if related, might be helpful:
> > https://www.mail-archive.com/qemu-devel@nongnu.org/msg686477.html
>
> Yes, it's helpful. Thanks!
>
> So is was it resolved whether it's appropriate to do a cpu_reset()
> within realize?
>
> Is the core of the problem that device_set_realize() ends up calling
> ppc_cpu_reset()?
There are 15 realize functions which call cpu_reset(), currently.
Making it safe seems more appropriate than forbidding it.
--
Eduardo
- Re: [PATCH] cpu: Add starts_halted() method, (continued)
- Re: [PATCH] cpu: Add starts_halted() method, Peter Maydell, 2020/07/08
- Re: [PATCH] cpu: Add starts_halted() method, Eduardo Habkost, 2020/07/08
- Re: [PATCH] cpu: Add starts_halted() method, Peter Maydell, 2020/07/08
- Re: [PATCH] cpu: Add starts_halted() method, Eduardo Habkost, 2020/07/08
- Re: [PATCH] cpu: Add starts_halted() method, Peter Maydell, 2020/07/08
- Re: [PATCH] cpu: Add starts_halted() method, Eduardo Habkost, 2020/07/08
- Re: [PATCH] cpu: Add starts_halted() method, Thiago Jung Bauermann, 2020/07/08
- Re: [PATCH] cpu: Add starts_halted() method, Thiago Jung Bauermann, 2020/07/08
- Re: [PATCH] cpu: Add starts_halted() method, Philippe Mathieu-Daudé, 2020/07/09
- Re: [PATCH] cpu: Add starts_halted() method, Thiago Jung Bauermann, 2020/07/10
- Re: [PATCH] cpu: Add starts_halted() method,
Eduardo Habkost <=
- Message not available
- Re: [PATCH] cpu: Add starts_halted() method, Thiago Jung Bauermann, 2020/07/10
- Re: [PATCH] cpu: Add starts_halted() method, Alex Bennée, 2020/07/11
- Re: [PATCH] cpu: Add starts_halted() method, Philippe Mathieu-Daudé, 2020/07/08
- Re: [PATCH] cpu: Add starts_halted() method, Eduardo Habkost, 2020/07/08
- Re: [PATCH] cpu: Add starts_halted() method, Philippe Mathieu-Daudé, 2020/07/09
- Re: [PATCH] cpu: Add starts_halted() method, Greg Kurz, 2020/07/09
- Re: [PATCH] cpu: Add starts_halted() method, Philippe Mathieu-Daudé, 2020/07/09
- Re: [PATCH] cpu: Add starts_halted() method, Greg Kurz, 2020/07/09
- Re: [PATCH] cpu: Add starts_halted() method, Philippe Mathieu-Daudé, 2020/07/09
- Re: [PATCH] cpu: Add starts_halted() method, Greg Kurz, 2020/07/09