Commit f5a3562e authored by Jacob Pan's avatar Jacob Pan Committed by Thomas Gleixner
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x86/irq: Reserve a per CPU IDT vector for posted MSIs 



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: default avatarJacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240423174114.526704-6-jacob.jun.pan@linux.intel.com
parent 7fec07fd

arch/x86/include/asm/irq_vectors.h

+7 −1
Original line number Diff line number Diff line
@@ -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