diff mbox series

[3/9] x86/mm: honor opt_pcid also for 32-bit PV domains

Message ID 5CCAE065020000780022B2EB@prv1-mh.provo.novell.com (mailing list archive)
State New, archived
Headers show
Series XSA-292 follow-up | expand

Commit Message

Jan Beulich May 2, 2019, 12:19 p.m. UTC 
I can't see any technical or performance reason why we should treat
32-bit PV different from 64-bit PV in this regard.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
diff mbox series

Patch

--- a/xen/arch/x86/pv/domain.c
+++ b/xen/arch/x86/pv/domain.c
@@ -180,7 +180,24 @@  int switch_compat(struct domain *d)
     d->arch.x87_fip_width = 4;
 
     d->arch.pv.xpti = false;
-    d->arch.pv.pcid = false;
+
+    if ( use_invpcid && cpu_has_pcid )
+        switch ( ACCESS_ONCE(opt_pcid) )
+        {
+        case PCID_OFF:
+        case PCID_XPTI:
+            d->arch.pv.pcid = false;
+            break;
+
+        case PCID_ALL:
+        case PCID_NOXPTI:
+            d->arch.pv.pcid = true;
+            break;
+
+        default:
+            ASSERT_UNREACHABLE();
+            break;
+        }
 
     return 0;
 
@@ -312,7 +329,7 @@  int pv_domain_initialise(struct domain *
 
     d->arch.pv.xpti = is_hardware_domain(d) ? opt_xpti_hwdom : opt_xpti_domu;
 
-    if ( !is_pv_32bit_domain(d) && use_invpcid && cpu_has_pcid )
+    if ( use_invpcid && cpu_has_pcid )
         switch ( ACCESS_ONCE(opt_pcid) )
         {
         case PCID_OFF: