linux-kernel - [PATCH RFC 02/13] x86: Add a Kconfig option for posted MSI

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Message-Id: <20231112041643.2868316-3-jacob.jun.pan@linux.intel.com>
Date:   Sat, 11 Nov 2023 20:16:32 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     LKML <linux-kernel@...r.kernel.org>, X86 Kernel <x86@...nel.org>,
        iommu@...ts.linux.dev, Thomas Gleixner <tglx@...utronix.de>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>, kvm@...r.kernel.org,
        Dave Hansen <dave.hansen@...el.com>,
        Joerg Roedel <joro@...tes.org>,
        "H. Peter Anvin" <hpa@...or.com>, "Borislav Petkov" <bp@...en8.de>,
        "Ingo Molnar" <mingo@...hat.com>
Cc:     Raj Ashok <ashok.raj@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>, maz@...nel.org,
        peterz@...radead.org, seanjc@...gle.com,
        "Robin Murphy" <robin.murphy@....com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH RFC 02/13] x86: Add a Kconfig option for posted MSI

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

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 arch/x86/Kconfig | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 66bfabae8814..f16882ddb390 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -463,6 +463,16 @@ 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_X2APIC && X86_64 && IRQ_REMAP
+	help
+	  This enables MSIs that are under IRQ remapping to be delivered as posted
+	  interrupts to the host kernel. IRQ throughput can potentially be improved
+	  by coalescing CPU notifications during high frequency IRQ 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