[SPARC64]: Detect sun4v early in boot process.

We look for "SUNW,sun4v" in the 'compatible' property
of the root OBP device tree node.

Protect every %ver register access, to make sure it is
not touched on sun4v, as %ver is hyperprivileged there.

Lock kernel TLB entries using hypervisor calls instead of
calls into OBP.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 3 deletions

diff --git a/arch/sparc64/kernel/setup.c b/arch/sparc64/kernel/setup.c
index 2d64320d3a4d..7f02c8f71df6 100644
--- a/arch/sparc64/kernel/setup.c
+++ b/arch/sparc64/kernel/setup.c
@@ -504,9 +504,12 @@ static void __init per_cpu_patch(void)
         if (tlb_type == spitfire && !this_is_starfire)
                 return;
 
-        __asm__ ("rdpr %%ver, %0" : "=r" (ver));
-        is_jbus = ((ver >> 32) == __JALAPENO_ID ||
-                   (ver >> 32) == __SERRANO_ID);
+        is_jbus = 0;
+        if (tlb_type != hypervisor) {
+                __asm__ ("rdpr %%ver, %0" : "=r" (ver));
+                is_jbus = ((ver >> 32) == __JALAPENO_ID ||
+                           (ver >> 32) == __SERRANO_ID);
+        }
 
         p = &__cpuid_patch;
         while (p < &__cpuid_patch_end) {