[Xen-changelog] [xen-unstable] x86: Allow dom0 pstate control to access APERF/MPERF/HWCR MSRs

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1281685115 -3600
# Node ID 6471b8b714011621752408ce9f7aabe2702486ae
# Parent  378d3cf5d7a1a71ff8bf7c88d02ac08563218e61
x86: Allow dom0 pstate control to access APERF/MPERF/HWCR MSRs

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.

Signed-off-by: Mark Langsdorf <mark.langsdorf@xxxxxxx>
---
 xen/arch/x86/traps.c |    9 +++++++++
 1 files changed, 9 insertions(+)

diff -r 378d3cf5d7a1 -r 6471b8b71401 xen/arch/x86/traps.c
--- a/xen/arch/x86/traps.c      Fri Aug 13 08:33:19 2010 +0100
+++ b/xen/arch/x86/traps.c      Fri Aug 13 08:38:35 2010 +0100
@@ -2228,6 +2228,7 @@ static int emulate_privileged_op(struct 
         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 +2268,14 @@ static int emulate_privileged_op(struct 
             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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