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Message-Id: <20240423174114.526704-6-jacob.jun.pan@linux.intel.com>
Date: Tue, 23 Apr 2024 10:41:07 -0700
From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
To: LKML <linux-kernel@...r.kernel.org>,
X86 Kernel <x86@...nel.org>,
Peter Zijlstra <peterz@...radead.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: Paul Luse <paul.e.luse@...el.com>,
Dan Williams <dan.j.williams@...el.com>,
Jens Axboe <axboe@...nel.dk>,
Raj Ashok <ashok.raj@...el.com>,
"Tian, Kevin" <kevin.tian@...el.com>,
maz@...nel.org,
seanjc@...gle.com,
"Robin Murphy" <robin.murphy@....com>,
jim.harris@...sung.com,
a.manzanares@...sung.com,
"Bjorn Helgaas" <helgaas@...nel.org>,
guang.zeng@...el.com,
robert.hoo.linux@...il.com,
oliver.sang@...el.com,
acme@...nel.org,
Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v3 05/12] 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@...ux.intel.com>
---
v2:
- Add missing CONFIG_ in #ifdef
- Extend changes to x86 tools
---
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 d18bfb238f66..13aea8fc3d45 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
--
2.25.1
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