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[Qemu-devel] [PATCH v8 12/25] tcg: handle EXCP_ATOMIC exception for syst
From: |
Alex Bennée |
Subject: |
[Qemu-devel] [PATCH v8 12/25] tcg: handle EXCP_ATOMIC exception for system emulation |
Date: |
Fri, 27 Jan 2017 10:34:52 +0000 |
From: Pranith Kumar <address@hidden>
The patch enables handling atomic code in the guest. This should be
preferably done in cpu_handle_exception(), but the current assumptions
regarding when we can execute atomic sections cause a deadlock.
Signed-off-by: Pranith Kumar <address@hidden>
[AJB: tweak title]
Signed-off-by: Alex Bennée <address@hidden>
Reviewed-by: Richard Henderson <address@hidden>
---
cpus.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/cpus.c b/cpus.c
index ecd1ec08d3..e3d9f3fe21 100644
--- a/cpus.c
+++ b/cpus.c
@@ -1346,6 +1346,11 @@ static void *qemu_tcg_rr_cpu_thread_fn(void *arg)
if (r == EXCP_DEBUG) {
cpu_handle_guest_debug(cpu);
break;
+ } else if (r == EXCP_ATOMIC) {
+ qemu_mutex_unlock_iothread();
+ cpu_exec_step_atomic(cpu);
+ qemu_mutex_lock_iothread();
+ break;
}
} else if (cpu->stop) {
if (cpu->unplug) {
@@ -1456,6 +1461,10 @@ static void *qemu_tcg_cpu_thread_fn(void *arg)
*/
g_assert(cpu->halted);
break;
+ case EXCP_ATOMIC:
+ qemu_mutex_unlock_iothread();
+ cpu_exec_step_atomic(cpu);
+ qemu_mutex_lock_iothread();
default:
/* Ignore everything else? */
break;
--
2.11.0
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