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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,
	Jacob Pan <jacob.jun.pan@linux.intel.com>
Subject: [PATCH v2 05/13] x86/irq: Reserve a per CPU IDT vector for posted MSIs
Date: Fri,  5 Apr 2024 15:31:02 -0700	[thread overview]
Message-ID: <20240405223110.1609888-6-jacob.jun.pan@linux.intel.com> (raw)
In-Reply-To: <20240405223110.1609888-1-jacob.jun.pan@linux.intel.com>

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@linux.intel.com>

---
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


  parent reply	other threads:[~2024-04-05 22:26 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-05 22:30 [PATCH v2 00/13] Coalesced Interrupt Delivery with posted MSI Jacob Pan
2024-04-05 22:30 ` [PATCH v2 01/13] x86/irq: Move posted interrupt descriptor out of vmx code Jacob Pan
2024-04-17  0:34   ` Sean Christopherson
2024-04-17 18:33     ` Jacob Pan
2024-04-05 22:30 ` [PATCH v2 02/13] x86/irq: Unionize PID.PIR for 64bit access w/o casting Jacob Pan
2024-04-05 22:31 ` [PATCH v2 03/13] x86/irq: Remove bitfields in posted interrupt descriptor Jacob Pan
2024-04-17  0:39   ` Sean Christopherson
2024-04-17 18:01     ` Jacob Pan
2024-04-18 17:30       ` Thomas Gleixner
2024-04-18 18:10         ` Jacob Pan
2024-04-05 22:31 ` [PATCH v2 04/13] x86/irq: Add a Kconfig option for posted MSI Jacob Pan
2024-04-05 22:31 ` Jacob Pan [this message]
2024-04-11 16:51   ` [PATCH v2 05/13] x86/irq: Reserve a per CPU IDT vector for posted MSIs Thomas Gleixner
2024-04-15 18:53     ` Jacob Pan
2024-04-15 20:43       ` Jacob Pan
2024-04-19  4:00         ` Thomas Gleixner
2024-04-19 14:24           ` Andi Kleen
2024-04-19 16:50             ` Thomas Gleixner
2024-04-19 20:07           ` Arnaldo Carvalho de Melo
2024-04-22 22:32             ` Jacob Pan
2024-04-12  9:14   ` Tian, Kevin
2024-04-12 14:27     ` Sean Christopherson
2024-04-16  3:45       ` Tian, Kevin
2024-04-05 22:31 ` [PATCH v2 06/13] x86/irq: Set up per host CPU posted interrupt descriptors Jacob Pan
2024-04-12  9:16   ` Tian, Kevin
2024-04-12 17:54     ` Jacob Pan
2024-04-05 22:31 ` [PATCH v2 07/13] x86/irq: Factor out calling ISR from common_interrupt Jacob Pan
2024-04-12  9:21   ` Tian, Kevin
2024-04-12 16:50     ` Jacob Pan
2024-04-05 22:31 ` [PATCH v2 08/13] x86/irq: Install posted MSI notification handler Jacob Pan
2024-04-11  7:52   ` Tian, Kevin
2024-04-11 17:38     ` Jacob Pan
2024-04-11 16:54   ` Thomas Gleixner
2024-04-11 18:29     ` Jacob Pan
2024-04-05 22:31 ` [PATCH v2 09/13] x86/irq: Factor out common code for checking pending interrupts Jacob Pan
2024-04-05 22:31 ` [PATCH v2 10/13] x86/irq: Extend checks for pending vectors to posted interrupts Jacob Pan
2024-04-12  9:25   ` Tian, Kevin
2024-04-12 18:23     ` Jacob Pan
2024-04-16  3:47       ` Tian, Kevin
2024-04-05 22:31 ` [PATCH v2 11/13] iommu/vt-d: Make posted MSI an opt-in cmdline option Jacob Pan
2024-04-06  4:31   ` Robert Hoo
2024-04-08 23:33     ` Jacob Pan
2024-04-13 10:59       ` Robert Hoo
2024-04-12  9:31   ` Tian, Kevin
2024-04-15 23:20     ` Jacob Pan
2024-04-05 22:31 ` [PATCH v2 12/13] iommu/vt-d: Add an irq_chip for posted MSIs Jacob Pan
2024-04-12  9:36   ` Tian, Kevin
2024-04-16 22:15     ` Jacob Pan
2024-04-05 22:31 ` [PATCH v2 13/13] iommu/vt-d: Enable posted mode for device MSIs Jacob Pan

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