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Re: [Xen-devel] [PATCH v3 3/4] x86/smp: check APIC ID on AP bringup
- To: Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 20 Dec 2019 15:23:07 +0000
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Wei Liu <wl@xxxxxxx>
- Delivery-date: Fri, 20 Dec 2019 15:23:25 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 20/12/2019 15:17, Jan Beulich wrote:
> On 04.12.2019 17:20, Roger Pau Monne wrote:
>> Check that the processor to be woken up APIC ID is addressable in the
>> current APIC mode.
>>
>> Note that in practice systems with APIC IDs > 255 should already have
>> x2APIC enabled by the firmware, and hence this is mostly a safety
>> belt.
>>
>> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>> ---
>> Changes since v2:
>> - Reword error message.
>> ---
>> xen/arch/x86/smpboot.c | 7 +++++++
>> 1 file changed, 7 insertions(+)
>>
>> diff --git a/xen/arch/x86/smpboot.c b/xen/arch/x86/smpboot.c
>> index fa691b6ba0..8cbb7173a4 100644
>> --- a/xen/arch/x86/smpboot.c
>> +++ b/xen/arch/x86/smpboot.c
>> @@ -1317,6 +1317,13 @@ int __cpu_up(unsigned int cpu)
>> if ( (apicid = x86_cpu_to_apicid[cpu]) == BAD_APICID )
>> return -ENODEV;
>>
>> + if ( (!x2apic_enabled || !iommu_intremap) && (apicid >> 8) )
> Btw, I'll change the right side to "apicid >= 0xff", as that ID is
> special. Or perhaps this should really be
>
> if ( (!x2apic_enabled && apicid >= APIC_ALL_CPUS) ||
> (!iommu_intremap && (apicid >> 8)) )
>
> Thoughts?
LGTM.
~Andrew
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