[Xen-changelog] [xen-unstable] x86: set ARAT feature flag for non-buggy AMD CPUs

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxxxx>
# Date 1304241255 -3600
# Node ID 1ac7336b629840df31e5857ca0245142fb783f2a
# Parent  e4fc9494b940ab5c6fa21885395c5b69418f43a0
x86: set ARAT feature flag for non-buggy AMD CPUs

This is the equivalent of a recent Linux change.

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


diff -r e4fc9494b940 -r 1ac7336b6298 xen/arch/x86/cpu/amd.c
--- a/xen/arch/x86/cpu/amd.c    Sun May 01 10:11:58 2011 +0100
+++ b/xen/arch/x86/cpu/amd.c    Sun May 01 10:14:15 2011 +0100
@@ -474,6 +474,10 @@
        }
 #endif
 
+       /* As a rule processors have APIC timer running in deep C states */
+       if (c->x86 >= 0xf && !cpu_has_amd_erratum(c, AMD_ERRATUM_400))
+               set_bit(X86_FEATURE_ARAT, c->x86_capability);
+
        /* Prevent TSC drift in non single-processor, single-core platforms. */
        if ((smp_processor_id() == 1) && c1_ramping_may_cause_clock_drift(c))
                disable_c1_ramping();
diff -r e4fc9494b940 -r 1ac7336b6298 xen/include/asm-x86/amd.h
--- a/xen/include/asm-x86/amd.h Sun May 01 10:11:58 2011 +0100
+++ b/xen/include/asm-x86/amd.h Sun May 01 10:14:15 2011 +0100
@@ -134,6 +134,10 @@
     AMD_OSVW_ERRATUM(3, AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf),    \
                        AMD_MODEL_RANGE(0x12, 0x0, 0x0, 0x1, 0x0))
 
+#define AMD_ERRATUM_400                                                 \
+    AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf),     \
+                        AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf))
+
 struct cpuinfo_x86;
 int cpu_has_amd_erratum(const struct cpuinfo_x86 *, int, ...);
 

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