[Xen-devel] [PATCH] xen: Add command line option to enable ASID support -- on by default

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

diff --git a/xen/arch/x86/hvm/svm/asid.c b/xen/arch/x86/hvm/svm/asid.c
--- a/xen/arch/x86/hvm/svm/asid.c
+++ b/xen/arch/x86/hvm/svm/asid.c
@@ -24,12 +24,16 @@
 #include <asm/amd.h>
 #include <asm/hvm/nestedhvm.h>
 
+/* Xen command-line option to enable ASIDs */
+static int opt_asid_enabled = 1;
+boolean_param("asid", opt_asid_enabled);
+
 void svm_asid_init(struct cpuinfo_x86 *c)
 {
     int nasids = 0;
 
     /* Check for erratum #170, and leave ASIDs disabled if it's present. */
-    if ( !cpu_has_amd_erratum(c, AMD_ERRATUM_170) )
+    if ( opt_asid_enabled && !cpu_has_amd_erratum(c, AMD_ERRATUM_170) )
         nasids = cpuid_ebx(0x8000000A);
 
     hvm_asid_init(nasids);

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