[Xen-devel] [PATCH] x86/AMD: also print TOM2 when printing MTRR state

["Jan Beulich" <JBeulich@xxxxxxxx>]

... to have a complete picture of cachability settings.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/cpu/mtrr/generic.c
+++ b/xen/arch/x86/cpu/mtrr/generic.c
@@ -182,6 +182,18 @@ static void __init print_mtrr_state(cons
                else
                        printk("%s  %u disabled\n", level, i);
        }
+
+       if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD
+           && boot_cpu_data.x86 >= 0xf) {
+               uint64_t syscfg, tom2;
+
+               rdmsrl(MSR_K8_SYSCFG, syscfg);
+               if (syscfg & (1 << 21)) {
+                       rdmsrl(MSR_K8_TOP_MEM2, tom2);
+                       printk("TOM2: %012"PRIx64"%s\n", tom2,
+                              syscfg & (1 << 22) ? " (WB)" : "");
+               }
+       }
 }
 
 /*  Some BIOS's are fucked and don't set all MTRRs the same!  */

Attachment: x86-AMD-print-TOM2.patch
Description: Text document

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