linux-kernel - [PATCH] X86: Hook apic vector allocation domain only when interrupt routing are set to ignore

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Date:	Wed, 23 Apr 2014 17:38:52 +0300
From:	Oren Twaig <oren@...lemp.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Andi Kleen <ak@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org,
	"Shai Fultheim (Shai@...leMP.com)" <Shai@...lemp.com>
Subject: [PATCH] X86: Hook apic vector allocation domain only when interrupt routing are set to ignore

Set all inclusive vector allocation domain only if interrupt routing is 
set to ignore. When in comply mode, vector allocation behavior isn't 
changed.

Signed-off-by: Oren Twaig <oren@...lemp.com>
Acked-by: Shai Fultheim <shai@...lemp.com>
---
diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index f6584a9..60a195d 100644
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -27,6 +27,9 @@
  #define TOPOLOGY_REGISTER_OFFSET 0x10

  #if defined CONFIG_PCI && defined CONFIG_PARAVIRT
+
+static int irc = 1;
+
  /*
   * Interrupt control on vSMPowered systems:
   * ~AC is a shadow of IF.  If IF is 'on' AC should be 'off'
@@ -101,6 +104,10 @@ static void __init set_vsmp_pv_ops(void)
  #ifdef CONFIG_SMP
      if (cap & ctl & BIT(8)) {
          ctl &= ~BIT(8);
+
+        /* Interrupt routing set to ignore */
+        irc = 0;
+
  #ifdef CONFIG_PROC_FS
          /* Don't let users change irq affinity via procfs */
          no_irq_affinity = 1;
@@ -218,7 +225,9 @@ static void vsmp_apic_post_init(void)
  {
      /* need to update phys_pkg_id */
      apic->phys_pkg_id = apicid_phys_pkg_id;
-    apic->vector_allocation_domain = fill_vector_allocation_domain;
+
+    if (!irc)
+        apic->vector_allocation_domain = fill_vector_allocation_domain;
  }

  void __init vsmp_init(void)


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