The following commit has been merged into the x86/irq branch of tip: Commit-ID: f5a3562ec9dd29e61735ccf098d8ba05cf6c7c72 Gitweb: https://git.kernel.org/tip/f5a3562ec9dd29e61735ccf098d8ba05cf6c7c72 Author: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx> AuthorDate: Tue, 23 Apr 2024 10:41:07 -07:00 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitterDate: Tue, 30 Apr 2024 00:54:42 +02:00 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: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20240423174114.526704-6-jacob.jun.pan@xxxxxxxxxxxxxxx --- arch/x86/include/asm/irq_vectors.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h index d18bfb2..13aea8f 100644 --- a/arch/x86/include/asm/irq_vectors.h +++ b/arch/x86/include/asm/irq_vectors.h @@ -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
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