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Re: Lockdep show 6.6-rc regression in Xen HVM CPU hotplug
- To: David Woodhouse <dwmw2@xxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, paulmck <paulmck@xxxxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Wed, 25 Oct 2023 09:19:11 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, Rahul Singh <rahul.singh@xxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
- Delivery-date: Wed, 25 Oct 2023 07:19:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24.10.23 15:45, David Woodhouse wrote:
On Tue, 2023-10-24 at 14:08 +0200, Juergen Gross wrote:
I can probably change xen_send_IPI_one() to not need irq_get_chip_data().
David, could you test the attached patch, please? Build tested only.
No longer whines when offlining CPU1.
Still triple-faults when bringing it back online. Or if I remove the
lockdep_assert_irqs_disabled() from load_current_idt(), gives the same
warnings as before, all on the same theme about IRQs being enabled when
they shouldn't be.
I think this is a false positive. No idea (again) why it would trigger only
with my patch applied.
The problem seems to be that lockdep_assert_irqs_disabled() doesn't know
about the "cli" at the very beginning of trampoline_start().
Juergen
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