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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 <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
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Jacob Pan authored and Thomas Gleixner committed 2024-04-30 00:54:42 +02:00
1 parent 7fec07fd21
commit f5a3562ec9
1 file changed
+7 -1
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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