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Re: [PATCH 3/3] x86/irq: introduce APIC_VECTOR_VALID
- To: dmkhn@xxxxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 17 Mar 2025 09:30:46 +0100
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- Cc: andrew.cooper3@xxxxxxxxxx, anthony.perard@xxxxxxxxxx, julien@xxxxxxx, michal.orzel@xxxxxxx, roger.pau@xxxxxxxxxx, sstabellini@xxxxxxxxxx, dmukhin@xxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 17 Mar 2025 08:30:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 15.03.2025 02:00, dmkhn@xxxxxxxxx wrote:
> Add new symbol APIC_VECTOR_VALID to replace open-coded value 16 in
> LAPIC and virtual LAPIC code.
First a good name is needed to make such a change. APIC_VECTOR_VALID
could imo be the name of a predicate macro, but it can't be a mere
number.
Then ...
> --- a/xen/arch/x86/cpu/mcheck/mce_intel.c
> +++ b/xen/arch/x86/cpu/mcheck/mce_intel.c
> @@ -136,7 +136,7 @@ static void intel_init_thermal(struct cpuinfo_x86 *c)
> * is required to set the same value for all threads/cores).
> */
> if ( (val & APIC_DM_MASK) != APIC_DM_FIXED
> - || (val & APIC_VECTOR_MASK) > 0xf )
> + || (val & APIC_VECTOR_MASK) > APIC_VECTOR_VALID )
... care needs to be taken that replacements are done such that the
"no functional change" claim is actually correct. (The 0xf, i.e. 15,
is replaced by 16 here. I didn't check if there are other similar
issues.)
> --- a/xen/arch/x86/include/asm/apicdef.h
> +++ b/xen/arch/x86/include/asm/apicdef.h
> @@ -78,6 +78,7 @@
> #define APIC_DM_STARTUP 0x00600
> #define APIC_DM_EXTINT 0x00700
> #define APIC_VECTOR_MASK 0x000FF
> +#define APIC_VECTOR_VALID (16)
> #define APIC_ICR2 0x310
Nit: No real need for parentheses here; adjacent #define-s don't have
any, so it's a little hard to see why you added them.
Jan
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