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.
[ Added comment - Jeremy ]
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 44dcad4..ed47d12 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1174,6 +1174,15 @@
xen_smp_init();
+#ifdef CONFIG_ACPI_NUMA
+ /*
+ * The pages we from Xen are not related to machine pages, so
+ * any NUMA information the kernel tries to get from ACPI will
+ * be meaningless. Prevent it from trying.
+ */
+ acpi_numa = -1;
+#endif
+
pgd = (pgd_t *)xen_start_info->pt_base;
if (!xen_initial_domain())