linux-kernel - [PATCH] xen: disable ACPI NUMA for PV guests

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Message-Id: <1291370043-3075-1-git-send-email-ian.campbell@citrix.com>
Date:	Fri,  3 Dec 2010 09:54:03 +0000
From:	Ian Campbell <ian.campbell@...rix.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	xen-devel@...ts.xensource.com,
	Vincent Caron <vcaron@...rstech.com>,
	linux-kernel@...r.kernel.org,
	Ian Campbell <ian.campbell@...rix.com>
Subject: [PATCH] xen: disable ACPI NUMA for PV guests

Xen does not currently expose PV-NUMA information to PV
guests. Therefore disable NUMA for the time being to prevent the
kernel picking up on an host-level NUMA information which it might
come across in the firmware.

Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
---
 arch/x86/xen/enlighten.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index fbb35cd..7cdf2f3 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1195,6 +1195,10 @@ asmlinkage void __init xen_start_kernel(void)
 
 	xen_smp_init();
 
+#ifdef CONFIG_ACPI_NUMA
+	acpi_numa = -1;
+#endif
+
 	pgd = (pgd_t *)xen_start_info->pt_base;
 
 	__supported_pte_mask |= _PAGE_IOMAP;
-- 
1.5.6.5

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