commit 3474b679486caa8f6448bae974e131370f360c13
author Jason J. Herne <jjherne@us.ibm.com> Thu Apr 25 04:25:51 2013 +0000
committer Alexander Graf <agraf@suse.de> Fri Apr 26 20:18:25 2013 +0200
tree 89f54e363e4fb01e20409e606ba8f8f89e9836d6
parent 420840e58b85f7f4e5493dca3f273566f261090a

Utilize selective runtime reg sync for hot code paths

Make use of new kvm_s390_get_registers_partial() for kvm_handle_css_inst() and
handle_hypercall() since they only need registers from the partial set and they
are called quite frequently.

Signed-off-by: Jason J. Herne <jjherne@us.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

target-s390x/kvm.c

diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c
index 02b2e39..fb006ee 100644
--- a/target-s390x/kvm.c
+++ b/target-s390x/kvm.c
@@ -467,12 +467,16 @@
     int r = 0;
     int no_cc = 0;
     CPUS390XState *env = &cpu->env;
+    CPUState *cs = ENV_GET_CPU(env);
 
     if (ipa0 != 0xb2) {
         /* Not handled for now. */
         return -1;
     }
-    cpu_synchronize_state(env);
+
+    kvm_s390_get_registers_partial(cs);
+    cs->kvm_vcpu_dirty = true;
+
     switch (ipa1) {
     case PRIV_XSCH:
         r = ioinst_handle_xsch(env, env->regs[1]);
@@ -603,7 +607,10 @@
 
 static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
 {
-    cpu_synchronize_state(env);
+    CPUState *cs = ENV_GET_CPU(env);
+
+    kvm_s390_get_registers_partial(cs);
+    cs->kvm_vcpu_dirty = true;
     env->regs[2] = s390_virtio_hypercall(env);
 
     return 0;
@@ -808,7 +815,9 @@
     struct kvm_run *run = cs->kvm_run;
     int ret;
 
-    cpu_synchronize_state(env);
+    kvm_s390_get_registers_partial(cs);
+    cs->kvm_vcpu_dirty = true;
+
     ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);
     if (ret >= 0) {
         /* Success; set condition code. */