linux-kernel - [34-longterm 180/209] x86, vt-d: Fix the vt-d fault handling irq migration in the x2apic mode

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Date:	Thu, 14 Apr 2011 13:55:38 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 180/209] x86, vt-d: Fix the vt-d fault handling irq migration in the x2apic mode

From: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>

  =====================================================================
  | This is a commit scheduled for the next v2.6.34 longterm release. |
  | If you see a problem with using this for longterm, please comment.|
  =====================================================================

commit 086e8ced65d9bcc4a8e8f1cd39b09640f2883f90 upstream.

In x2apic mode, we need to set the upper address register of the fault
handling interrupt register of the vt-d hardware. Without this
irq migration of the vt-d fault handling interrupt is broken.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
LKML-Reference: <1291225233.2648.39.camel@...iddha-MOBL3>
Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
Acked-by: Chris Wright <chrisw@...s-sol.org>
Tested-by: Takao Indoh <indou.takao@...fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 arch/x86/kernel/apic/io_apic.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 38128cc..4a809bf 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3642,6 +3642,7 @@ static int dmar_msi_set_affinity(unsigned int irq, const struct cpumask *mask)
 	msg.data |= MSI_DATA_VECTOR(cfg->vector);
 	msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
 	msg.address_lo |= MSI_ADDR_DEST_ID(dest);
+	msg.address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(dest);
 
 	dmar_msi_write(irq, &msg);
 
-- 
1.7.4.4

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