commit e479c207d7616e3b6ea42d14d1c6a7fef1f32fc4
author Jan Kiszka <jan.kiszka@siemens.com> Fri Feb 17 18:31:13 2012 +0100
committer Avi Kivity <avi@redhat.com> Sat Feb 18 12:15:52 2012 +0200
tree 521d5afdce6b9d625151e2f5fe4569da4001256e
parent d1f866366070d09ff5c467efb0a64ac582e3aa5d

kvm: Set cpu_single_env only once

As we have thread-local cpu_single_env now and KVM uses exactly one
thread per VCPU, we can drop the cpu_single_env updates from the loop
and initialize this variable only once during setup.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

cpus.c

diff --git a/cpus.c b/cpus.c
index f45a438..d0c8340 100644
--- a/cpus.c
+++ b/cpus.c
@@ -714,6 +714,7 @@
     qemu_mutex_lock(&qemu_global_mutex);
     qemu_thread_get_self(env->thread);
     env->thread_id = qemu_get_thread_id();
+    cpu_single_env = env;
 
     r = kvm_init_vcpu(env);
     if (r < 0) {

kvm-all.c

diff --git a/kvm-all.c b/kvm-all.c
index c4babda..e2cbc03 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1118,8 +1118,6 @@
         return EXCP_HLT;
     }
 
-    cpu_single_env = env;
-
     do {
         if (env->kvm_vcpu_dirty) {
             kvm_arch_put_registers(env, KVM_PUT_RUNTIME_STATE);
@@ -1136,13 +1134,11 @@
              */
             qemu_cpu_kick_self();
         }
-        cpu_single_env = NULL;
         qemu_mutex_unlock_iothread();
 
         run_ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
 
         qemu_mutex_lock_iothread();
-        cpu_single_env = env;
         kvm_arch_post_run(env, run);
 
         kvm_flush_coalesced_mmio_buffer();
@@ -1206,7 +1202,6 @@
     }
 
     env->exit_request = 0;
-    cpu_single_env = NULL;
     return ret;
 }