[PATCH RFC v2 2/2] linux/vnuma: Enables NUMA for domu PV guest

[Elena Ufimtseva <ufimtseva@gmail.com>]

After the NUMA topology was received from Xen,
enable NUMA during boot. Should have CONFIG_NUMA
enabled in kernel.

Changes since v1:
- added additional checks for PV guest and hypercall
support before enablinf NUMA;

Signed-off-by: Elena Ufimtseva <ufimtseva@gmail.com>
---
 arch/x86/xen/setup.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 8f3eea6..2f2d28e 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -20,6 +20,7 @@
 #include <asm/numa.h>
 #include <asm/xen/hypervisor.h>
 #include <asm/xen/hypercall.h>
+#include <asm/xen/vnuma.h>
 
 #include <xen/xen.h>
 #include <xen/page.h>
@@ -583,6 +584,9 @@ void __init xen_arch_setup(void)
 	WARN_ON(xen_set_default_idle());
 	fiddle_vdso();
 #ifdef CONFIG_NUMA
-	numa_off = 1;
+	if (!xen_initial_domain() && xen_vnuma_support())
+		numa_off = 0;
+	else
+		numa_off = 1;
 #endif
 }
-- 
1.7.10.4