[Xen-devel] [PATCH][retry 1] Allow dom0 pstate control to read MSRs

[Mark Langsdorf <mark.langsdorf@xxxxxxx>]

The current version of the powernow driver uses the APERF/MPEF
and the HWCR MSRs.  Add cases in traps.c to let dom0 access 
those MSRs.

The previous version used some old code.  This version
is correct.


--Mark Langsdorf
Operating System Research Center

Signed-off-by: Mark Langsdorf <mark.langsdorf@xxxxxxx>
diff -r f45026ec8db5 xen/arch/x86/traps.c
--- a/xen/arch/x86/traps.c      Mon Aug 09 18:29:50 2010 +0100
+++ b/xen/arch/x86/traps.c      Thu Aug 12 17:03:53 2010 -0500
@@ -2228,6 +2228,7 @@
         case MSR_K8_PSTATE5:
         case MSR_K8_PSTATE6:
         case MSR_K8_PSTATE7:
+        case MSR_K8_HWCR:
             if ( boot_cpu_data.x86_vendor != X86_VENDOR_AMD )
                 goto fail;
             if ( !is_cpufreq_controller(v->domain) )
@@ -2267,6 +2268,15 @@
             break;
         case MSR_IA32_MPERF:
         case MSR_IA32_APERF:
+            if (( boot_cpu_data.x86_vendor != X86_VENDOR_INTEL ) &&
+                ( boot_cpu_data.x86_vendor != X86_VENDOR_AMD ) )
+                goto fail;
+            if ( !is_cpufreq_controller(v->domain) )
+                break;
+            if ( wrmsr_safe(regs->ecx, msr_content ) != 0 )
+                goto fail;
+            break;
+
         case MSR_IA32_PERF_CTL:
             if ( boot_cpu_data.x86_vendor != X86_VENDOR_INTEL )
                 goto fail;


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