target/i386/kvm.c: Handle renaming of KVM_HINTS_DEDICATED

In kernel header commit 633711e8287, the define KVM_HINTS_DEDICATED
was renamed to KVM_HINTS_REALTIME. Work around this compatibility
break by (a) using the new constant name, and (b) defining it
if the headers don't.

Part (b) can be removed once we've updated our copy of the kernel
headers to a version that defines KVM_HINTS_REALTIME.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20180525132755.21839-5-peter.maydell@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

target/i386/kvm.c

@@ -47,6 +47,11 @@
 #include "exec/memattrs.h"
 #include "trace.h"
 
+/* Work around this kernel header constant changing its name */
+#ifndef KVM_HINTS_REALTIME
+#define KVM_HINTS_REALTIME KVM_HINTS_DEDICATED
+#endif
+
 //#define DEBUG_KVM
 
 #ifdef DEBUG_KVM
@@ -386,7 +391,7 @@ uint32_t kvm_arch_get_supported_cpuid(KVMState *s, uint32_t function,
             ret &= ~(1U << KVM_FEATURE_PV_UNHALT);
         }
     } else if (function == KVM_CPUID_FEATURES && reg == R_EDX) {
-        ret |= 1U << KVM_HINTS_DEDICATED;
+        ret |= 1U << KVM_HINTS_REALTIME;
         found = 1;
     }