Re: [Xen-devel] [PATCH v2] x86/nmi: start NMI watchdog on CPU0 after SMP bootstrap

2018-02-19 Thread Jan Beulich
>>> On 16.02.18 at 18:46, wrote: > We're noticing a reproducible system boot hang on certain > post-Skylake platforms where the BIOS is configured in > legacy boot mode with x2APIC disabled. The system stalls > immediately after writing the first SMP initialization > sequence into APIC ICR. > > T

Re: [Xen-devel] [PATCH v2] x86/nmi: start NMI watchdog on CPU0 after SMP bootstrap

2018-02-16 Thread Alexey G
On Fri, 16 Feb 2018 17:46:48 + Igor Druzhinin wrote: >We're noticing a reproducible system boot hang on certain >post-Skylake platforms where the BIOS is configured in >legacy boot mode with x2APIC disabled. The system stalls >immediately after writing the first SMP initialization >sequence i

[Xen-devel] [PATCH v2] x86/nmi: start NMI watchdog on CPU0 after SMP bootstrap

2018-02-16 Thread Igor Druzhinin
We're noticing a reproducible system boot hang on certain post-Skylake platforms where the BIOS is configured in legacy boot mode with x2APIC disabled. The system stalls immediately after writing the first SMP initialization sequence into APIC ICR. The cause of the problem is watchdog NMI handler