Received-SPF: pass (google.com: domain of linux-kernel+bounces-155686-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1;
From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: LKML <linux-kernel@vger.kernel.org>,
	X86 Kernel <x86@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	iommu@lists.linux.dev,
	Thomas Gleixner <tglx@linutronix.de>,
	"Lu Baolu" <baolu.lu@linux.intel.com>,
	kvm@vger.kernel.org,
	Dave Hansen <dave.hansen@intel.com>,
	Joerg Roedel <joro@8bytes.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"Borislav Petkov" <bp@alien8.de>,
	"Ingo Molnar" <mingo@redhat.com>
Cc: Paul Luse <paul.e.luse@intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Jens Axboe <axboe@kernel.dk>,
	Raj Ashok <ashok.raj@intel.com>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	maz@kernel.org,
	seanjc@google.com,
	"Robin Murphy" <robin.murphy@arm.com>,
	jim.harris@samsung.com,
	a.manzanares@samsung.com,
	"Bjorn Helgaas" <helgaas@kernel.org>,
	guang.zeng@intel.com,
	robert.hoo.linux@gmail.com,
	oliver.sang@intel.com,
	acme@kernel.org,
	Jacob Pan <jacob.jun.pan@linux.intel.com>
Subject: [PATCH v3  04/12] x86/irq: Add a Kconfig option for posted MSI
Date: Tue, 23 Apr 2024 10:41:06 -0700
Message-Id: <20240423174114.526704-5-jacob.jun.pan@linux.intel.com>
In-Reply-To: <20240423174114.526704-1-jacob.jun.pan@linux.intel.com>
References: <20240423174114.526704-1-jacob.jun.pan@linux.intel.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

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