[PATCH v3 04/12] x86/irq: Add a Kconfig option for posted MSI

Jacob Pan
2024-04-23T17:36:47Z

This option will be used to support delivering MSIs as posted
interrupts. Interrupt remapping is required.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>

---
v2: Remove x2apic dependency
---
arch/x86/Kconfig | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4474bf32d0a4..fed22fc66217 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -464,6 +464,17 @@ config X86_X2APIC

If you don't know what to do here, say N.

+config X86_POSTED_MSI
+ bool "Enable MSI and MSI-x delivery by posted interrupts"
+ depends on X86_64 && IRQ_REMAP
+ help
+ This enables MSIs that are under interrupt remapping to be delivered as
+ posted interrupts to the host kernel. Interrupt throughput can
+ potentially be improved by coalescing CPU notifications during high
+ frequency bursts.
+
+ If you don't know what to do here, say N.
+
config X86_MPPARSE
bool "Enable MPS table" if ACPI
default y
--
2.25.1