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From 1666ea1986c2fdce3bc27aa96ae6bf3a632dbc99 Mon Sep 17 00:00:00 2001
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From: Nigel Croxon <ncroxon@redhat.com>
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Date: Wed, 31 Jul 2013 15:12:17 +0200
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Subject: Introduce async_run_on_cpu
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RH-Author: Nigel Croxon <ncroxon@redhat.com>
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Message-id: <1375283539-18714-2-git-send-email-ncroxon@redhat.com>
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Patchwork-id: 52874
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O-Subject: [RHEL7 PATCH 1/3] Introduce async_run_on_cpu
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Bugzilla: 985958
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RH-Acked-by: Orit Wasserman <owasserm@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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Bugzilla: 985958 - Throttle-down guest to help with live migration convergence (backport to RHEL7.0)
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https://bugzilla.redhat.com/show_bug.cgi?id=985958
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Backported from the following upstream commit:
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commit 3c02270db980007424d797506301826310ce2db4
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Author: Chegu Vinod <chegu_vinod@hp.com>
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Date:   Mon Jun 24 03:49:41 2013 -0600
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    Introduce async_run_on_cpu()
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    Introduce an asynchronous version of run_on_cpu() i.e. the caller
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    doesn't have to block till the call back routine finishes execution
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    on the target vcpu.
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    Signed-off-by: Chegu Vinod <chegu_vinod@hp.com>
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    Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
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    Signed-off-by: Juan Quintela <quintela@redhat.com>
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diff --git a/cpus.c b/cpus.c
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index c232265..8cd4eab 100644
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--- a/cpus.c
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+++ b/cpus.c
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@@ -653,6 +653,7 @@ void run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
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     wi.func = func;
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     wi.data = data;
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+    wi.free = false;
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     if (cpu->queued_work_first == NULL) {
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         cpu->queued_work_first = &wi;
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     } else {
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@@ -671,6 +672,31 @@ void run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
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     }
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 }
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+void async_run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
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+{
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+    struct qemu_work_item *wi;
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+
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+    if (qemu_cpu_is_self(cpu)) {
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+        func(data);
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+        return;
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+    }
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+
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+    wi = g_malloc0(sizeof(struct qemu_work_item));
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+    wi->func = func;
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+    wi->data = data;
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+    wi->free = true;
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+    if (cpu->queued_work_first == NULL) {
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+        cpu->queued_work_first = wi;
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+    } else {
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+        cpu->queued_work_last->next = wi;
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+    }
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+    cpu->queued_work_last = wi;
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+    wi->next = NULL;
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+    wi->done = false;
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+
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+    qemu_cpu_kick(cpu);
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+}
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+
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 static void flush_queued_work(CPUState *cpu)
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 {
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     struct qemu_work_item *wi;
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@@ -683,6 +709,9 @@ static void flush_queued_work(CPUState *cpu)
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         cpu->queued_work_first = wi->next;
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         wi->func(wi->data);
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         wi->done = true;
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+        if (wi->free) {
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+            g_free(wi);
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+        }
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     }
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     cpu->queued_work_last = NULL;
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     qemu_cond_broadcast(&qemu_work_cond);
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diff --git a/include/qemu-common.h b/include/qemu-common.h
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index 3b1ca8e..73c6419 100644
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--- a/include/qemu-common.h
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+++ b/include/qemu-common.h
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@@ -288,6 +288,7 @@ struct qemu_work_item {
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     void (*func)(void *data);
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     void *data;
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     int done;
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+    bool free;
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 };
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 #ifdef CONFIG_USER_ONLY
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diff --git a/include/qom/cpu.h b/include/qom/cpu.h
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index 7cd9442..46465e9 100644
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--- a/include/qom/cpu.h
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+++ b/include/qom/cpu.h
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@@ -265,6 +265,16 @@ bool cpu_is_stopped(CPUState *cpu);
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 void run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data);
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 /**
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+ * async_run_on_cpu:
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+ * @cpu: The vCPU to run on.
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+ * @func: The function to be executed.
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+ * @data: Data to pass to the function.
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+ *
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+ * Schedules the function @func for execution on the vCPU @cpu asynchronously.
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+ */
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+void async_run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data);
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+
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+/**
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  * qemu_for_each_cpu:
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  * @func: The function to be executed.
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  * @data: Data to pass to the function.