[Xen-devel] [PATCH] x86/AMD: don't set ARAT feature flag on family F CPUs

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

Following Linux commit 14fb57dccb6e1defe9f89a66f548fcb24c374c1d from
Borislav Petkov.

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

--- a/xen/arch/x86/cpu/amd.c
+++ b/xen/arch/x86/cpu/amd.c
@@ -475,7 +475,7 @@ static void __devinit init_amd(struct cp
 #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))
+       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. */

Attachment: x86-AMD-ARAT-adjust.patch
Description: Text document

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