Re: [Xen-devel] [PATCH v3] x86/nmi: start NMI watchdog on CPU0 after SMP bootstrap

2018-02-19 Thread Alexey G
On Mon, 19 Feb 2018 14:48:37 + Andrew Cooper wrote: >On 19/02/18 14:23, Igor Druzhinin wrote: >> We're noticing a reproducible system boot hang on certain >> post-Skylake platforms where the BIOS is configured in > >These are Skylake, not post-Skylake. Well, strictly speaking, any platform

Re: [Xen-devel] [PATCH v3] x86/nmi: start NMI watchdog on CPU0 after SMP bootstrap

2018-02-19 Thread Jan Beulich
>>> On 19.02.18 at 16:20, wrote: > On 19/02/18 15:18, Jan Beulich wrote: > On 19.02.18 at 15:23, 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 >>> imm

Re: [Xen-devel] [PATCH v3] x86/nmi: start NMI watchdog on CPU0 after SMP bootstrap

2018-02-19 Thread Igor Druzhinin
On 19/02/18 15:18, Jan Beulich wrote: On 19.02.18 at 15:23, 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 init

Re: [Xen-devel] [PATCH v3] x86/nmi: start NMI watchdog on CPU0 after SMP bootstrap

2018-02-19 Thread Jan Beulich
>>> On 19.02.18 at 15:23, 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 v3] x86/nmi: start NMI watchdog on CPU0 after SMP bootstrap

2018-02-19 Thread Andrew Cooper
On 19/02/18 14:23, Igor Druzhinin wrote: > We're noticing a reproducible system boot hang on certain > post-Skylake platforms where the BIOS is configured in These are Skylake, not post-Skylake. > legacy boot mode with x2APIC disabled. The system stalls > immediately after writing the first SMP i