[patch 3/3] QEMU/KVM: notify IO thread of pending bhs

[Marcelo Tosatti <mtosatti@redhat.com>]

[-- Attachment #1: qemu-bh-schedule --]
[-- Type: text/plain, Size: 1764 bytes --]

This fixes the slow vmdk issue found in the regression
tests.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Index: kvm-userspace.io/qemu/qemu-kvm.c
===================================================================
--- kvm-userspace.io.orig/qemu/qemu-kvm.c
+++ kvm-userspace.io/qemu/qemu-kvm.c
@@ -411,6 +411,12 @@ int kvm_init_ap(void)
     return 0;
 }
 
+void qemu_kvm_notify_work(void)
+{
+    if (io_thread)
+        pthread_kill(io_thread, SIGUSR1);
+}
+
 /*
  * The IO thread has all signals that inform machine events
  * blocked (io_signal_table), so it won't get interrupted
Index: kvm-userspace.io/qemu/qemu-kvm.h
===================================================================
--- kvm-userspace.io.orig/qemu/qemu-kvm.h
+++ kvm-userspace.io/qemu/qemu-kvm.h
@@ -60,6 +60,8 @@ void qemu_kvm_aio_wait_start(void);
 void qemu_kvm_aio_wait(void);
 void qemu_kvm_aio_wait_end(void);
 
+void qemu_kvm_notify_work(void);
+
 void kvm_tpr_opt_setup();
 void kvm_tpr_access_report(CPUState *env, uint64_t rip, int is_write);
 int handle_tpr_access(void *opaque, int vcpu,
Index: kvm-userspace.io/qemu/vl.c
===================================================================
--- kvm-userspace.io.orig/qemu/vl.c
+++ kvm-userspace.io/qemu/vl.c
@@ -7588,6 +7588,8 @@ void qemu_bh_schedule(QEMUBH *bh)
     if (env) {
         cpu_interrupt(env, CPU_INTERRUPT_EXIT);
     }
+    if (kvm_enabled())
+        qemu_kvm_notify_work();
 }
 
 void qemu_bh_cancel(QEMUBH *bh)

-- 


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