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Re: [PATCH 1/2] x86/boot: Fix setup_apic_nmi_watchdog() to fail more cleanly
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 19 Mar 2024 17:49:02 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 19 Mar 2024 16:49:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.03.2024 15:48, Andrew Cooper wrote:
> Right now, if the user requests the watchdog on the command line,
> setup_apic_nmi_watchdog() will blindly assume that setting up the watchdog
> worked. Reuse nmi_perfctr_msr to identify when the watchdog has been set up.
>
> Rearrange setup_p6_watchdog() to not set nmi_perfctr_msr until the sanity
> checks are performed. Turn setup_p4_watchdog() into a void function, matching
> the others.
>
> If the watchdog isn't set up, inform the user and override to NMI_NONE, which
> will prevent check_nmi_watchdog() from claiming that all CPUs are stuck.
>
> e.g.:
>
> (XEN) alt table ffff82d040697c38 -> ffff82d0406a97f0
> (XEN) Failed to configure NMI watchdog
> (XEN) Brought up 512 CPUs
> (XEN) Scheduling granularity: cpu, 1 CPU per sched-resource
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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