[PATCH v2 05/13] x86/irq: Reserve a per CPU IDT vector for posted MSIs
From: Jacob Pan
Date: Fri Apr 05 2024 - 18:28:54 EST
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>
---
v2:
- Add missing CONFIG_ in #ifdef
- Extend changes to x86 tools
---
arch/x86/include/asm/irq_vectors.h | 9 ++++++++-
tools/arch/x86/include/asm/irq_vectors.h | 9 ++++++++-
2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
index d18bfb238f66..1ee00be8218d 100644
--- a/arch/x86/include/asm/irq_vectors.h
+++ b/arch/x86/include/asm/irq_vectors.h
@@ -97,9 +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
+#ifdef CONFIG_X86_POSTED_MSI
+#define FIRST_SYSTEM_VECTOR POSTED_MSI_NOTIFICATION_VECTOR
+#elif defined(CONFIG_X86_LOCAL_APIC)
#define FIRST_SYSTEM_VECTOR LOCAL_TIMER_VECTOR
#else
#define FIRST_SYSTEM_VECTOR NR_VECTORS
diff --git a/tools/arch/x86/include/asm/irq_vectors.h b/tools/arch/x86/include/asm/irq_vectors.h
index 3f73ac3ed3a0..989816ca7c9e 100644
--- a/tools/arch/x86/include/asm/irq_vectors.h
+++ b/tools/arch/x86/include/asm/irq_vectors.h
@@ -99,9 +99,16 @@
#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
+#ifdef CONFIG_X86_POSTED_MSI
+#define FIRST_SYSTEM_VECTOR POSTED_MSI_NOTIFICATION_VECTOR
+#elif defined(CONFIG_X86_LOCAL_APIC)
#define FIRST_SYSTEM_VECTOR LOCAL_TIMER_VECTOR
#else
#define FIRST_SYSTEM_VECTOR NR_VECTORS
--
2.25.1