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x86/irq: Reserve a per CPU IDT vector for posted MSIs

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When posted MSI is enabled, all device MSIs are multiplexed into a single
notification vector. MSI handlers will be de-multiplexed at run-time by
system software without IDT delivery.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240423174114.526704-6-jacob.jun.pan@linux.intel.com
This commit is contained in:
Jacob Pan 2024-04-23 10:41:07 -07:00 committed by Thomas Gleixner
parent 7fec07fd21
commit f5a3562ec9
1 changed files with 7 additions and 1 deletions
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8
arch/x86/include/asm/irq_vectors.h
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@ -97,10 +97,16 @@
#define LOCAL_TIMER_VECTOR 0xec
/*
* Posted interrupt notification vector for all device MSIs delivered to
* the host kernel.
*/
#define POSTED_MSI_NOTIFICATION_VECTOR 0xeb
#define NR_VECTORS 256
#ifdef CONFIG_X86_LOCAL_APIC
#define FIRST_SYSTEM_VECTOR LOCAL_TIMER_VECTOR
#define FIRST_SYSTEM_VECTOR POSTED_MSI_NOTIFICATION_VECTOR
#else
#define FIRST_SYSTEM_VECTOR NR_VECTORS
#endif