x2apic: fix reserved APIC register accesses in print_local_APIC()

APIC_ARBPRI is a reserved register for XAPIC and beyond.
APIC_RRR is a reserved register except for 82489DX, APIC for Pentium processors.
APIC_EOI is a write only register.
APIC_DFR is reserved in x2apic mode.

Access to these registers in x2apic will result in #GP fault. Fix these
apic register accesses.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 18 insertions, 9 deletions

diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index d28128e0392c..93ceb19d1e90 100644
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -1751,21 +1751,30 @@ __apicdebuginit(void) print_local_APIC(void *dummy)
         printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
 
         if (APIC_INTEGRATED(ver)) {                     /* !82489DX */
-                v = apic_read(APIC_ARBPRI);
-                printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
-                        v & APIC_ARBPRI_MASK);
+                if (!APIC_XAPIC(ver)) {
+                        v = apic_read(APIC_ARBPRI);
+                        printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
+                               v & APIC_ARBPRI_MASK);
+                }
                 v = apic_read(APIC_PROCPRI);
                 printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
         }
 
-        v = apic_read(APIC_EOI);
-        printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
-        v = apic_read(APIC_RRR);
-        printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
+        /*
+         * Remote read supported only in the 82489DX and local APIC for
+         * Pentium processors.
+         */
+        if (!APIC_INTEGRATED(ver) || maxlvt == 3) {
+                v = apic_read(APIC_RRR);
+                printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
+        }
+
         v = apic_read(APIC_LDR);
         printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
-        v = apic_read(APIC_DFR);
-        printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
+        if (!x2apic_enabled()) {
+                v = apic_read(APIC_DFR);
+                printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
+        }
         v = apic_read(APIC_SPIV);
         printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);