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[Xen-devel] [PATCH SpectreV1+L1TF v6 7/9] is_hvm/pv_domain: block speculation



When checking for being an hvm domain, or PV domain, we have to make
sure that speculation cannot bypass that check, and eventually access
data that should not end up in cache for the current domain type.

Signed-off-by: Norbert Manthey <nmanthey@xxxxxxxxx>

---
 xen/include/xen/sched.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -922,7 +922,8 @@ void watchdog_domain_destroy(struct domain *d);
 
 static inline bool is_pv_domain(const struct domain *d)
 {
-    return IS_ENABLED(CONFIG_PV) ? d->guest_type == guest_type_pv : false;
+    return IS_ENABLED(CONFIG_PV)
+           ? evaluate_nospec(d->guest_type == guest_type_pv) : false;
 }
 
 static inline bool is_pv_vcpu(const struct vcpu *v)
@@ -953,7 +954,8 @@ static inline bool is_pv_64bit_vcpu(const struct vcpu *v)
 #endif
 static inline bool is_hvm_domain(const struct domain *d)
 {
-    return IS_ENABLED(CONFIG_HVM) ? d->guest_type == guest_type_hvm : false;
+    return IS_ENABLED(CONFIG_HVM)
+           ? evaluate_nospec(d->guest_type == guest_type_hvm) : false;
 }
 
 static inline bool is_hvm_vcpu(const struct vcpu *v)
-- 
2.7.4




Amazon Development Center Germany GmbH
Krausenstr. 38
10117 Berlin
Geschaeftsfuehrer: Christian Schlaeger, Ralf Herbrich
Ust-ID: DE 289 237 879
Eingetragen am Amtsgericht Charlottenburg HRB 149173 B



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