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Re: [Xen-devel] [PATCH v1 1/2] system_state: introduce SYS_STATE_smp_booted
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
- Date: Tue, 27 Nov 2018 11:00:28 +0000
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- Cc: "sergey.dyasli@xxxxxxxxxx >> Sergey Dyasli" <sergey.dyasli@xxxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxx, Julien Grall <julien.grall@xxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 27 Nov 2018 11:00:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 27/11/2018 10:22, Jan Beulich wrote:
>>>> On 27.11.18 at 11:00, <sergey.dyasli@xxxxxxxxxx> wrote:
>> The new state means that all secondary CPUs are up. On x86 this also
>> means that a microcode was (potentially) updated on all CPUs.
>
> I'm slightly concerned by such an x86 specific: Could we settle on
> a more generic description of the state all CPUs are in at that
> point, like "fully functional", and only give ucode loading on x86
> as an example?
According to Julien's comment, I need to make this fix to be x86 only.
So I plan to introduce something like "bool suspend_idle_scrub" instead.
>> @@ -930,6 +932,8 @@ void __init start_xen(unsigned long boot_phys_offset,
>> printk("Brought up %ld CPUs\n", (long)num_online_cpus());
>> /* TODO: smp_cpus_done(); */
>>
>> + system_state = SYS_STATE_smp_booted;
>
> The placement here and ...
>
>> --- a/xen/arch/x86/setup.c
>> +++ b/xen/arch/x86/setup.c
>> @@ -1683,6 +1683,8 @@ void __init noreturn __start_xen(unsigned long mbi_p)
>> }
>> }
>>
>> + system_state = SYS_STATE_smp_booted;
>> +
>> printk("Brought up %ld CPUs\n", (long)num_online_cpus());
>> if ( num_parked )
>> printk(XENLOG_INFO "Parked %u CPUs\n", num_parked);
>
> ... here differ wrt the printk()s - is this intentional, and if so why?
This was not intentional, but it hardly matters now.
--
Thanks,
Sergey
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