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Re: [PATCH v1 12/28] x86: apic: use APIC_EIO_ACK instead of open-coded 0
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 5 Nov 2026 11:21:58 +0100
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- Cc: jason.andryuk@xxxxxxx, roger@xxxxxxxxxxxxxx, teddy.astie@xxxxxxxxxx, dmukhin@xxxxxxx, dmukhin@xxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 05 Nov 2026 10:22:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05.11.2026 11:20, Andrew Cooper wrote:
> On 05/11/2026 1:33 am, dmukhin@xxxxxxxx wrote:
>> --- a/xen/arch/x86/include/asm/apicdef.h
>> +++ b/xen/arch/x86/include/asm/apicdef.h
>> @@ -25,7 +25,7 @@
>> #define APIC_ARBPRI_MASK 0xFF
>> #define APIC_PROCPRI 0xA0
>> #define APIC_EOI 0xB0
>> -#define APIC_EIO_ACK 0x0 /*
>> Write this to the EOI register */
>> +#define APIC_EOI_ACK 0x0 /* Docs
>> say use 0 for future compatibility */
>> #define APIC_RRR 0xC0
>> #define APIC_LDR 0xD0
>> #define APIC_LDR_MASK (0xFFu<<24)
>
> Honestly, I'd prefer to delete this constant rather than to make use of
> it. The typo in the name shows it's not being used at all.
>
> AMD have a feature called Selective EOI where you can write a vector in
> and have it EOI something which isn't the currently in-service one.
Makes it even more not to use plain 0 for the present write, I'd say.
Jan
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