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[Qemu-devel] [PATCH v7 12/27] tcg: handle EXCP_ATOMIC exception for syst
From: |
Alex Bennée |
Subject: |
[Qemu-devel] [PATCH v7 12/27] tcg: handle EXCP_ATOMIC exception for system emulation |
Date: |
Thu, 19 Jan 2017 17:04:52 +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 32e9ff4b34..4a66c88ebe 100644
--- a/cpus.c
+++ b/cpus.c
@@ -1343,6 +1343,11 @@ 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) {
@@ -1413,6 +1418,10 @@ 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
[Qemu-devel] [PATCH v7 09/27] tcg: remove global exit_request, Alex Bennée, 2017/01/19
[Qemu-devel] [PATCH v7 02/27] mttcg: translate-all: Enable locking debug in a debug build, Alex Bennée, 2017/01/19
[Qemu-devel] [PATCH v7 10/27] tcg: enable tb_lock() for SoftMMU, Alex Bennée, 2017/01/19
[Qemu-devel] [PATCH v7 08/27] tcg: drop global lock during TCG code execution, Alex Bennée, 2017/01/19
[Qemu-devel] [PATCH v7 12/27] tcg: handle EXCP_ATOMIC exception for system emulation,
Alex Bennée <=
[Qemu-devel] [PATCH v7 11/27] tcg: enable thread-per-vCPU, Alex Bennée, 2017/01/19
[Qemu-devel] [PATCH v7 13/27] cputlb: add assert_cpu_is_self checks, Alex Bennée, 2017/01/19
[Qemu-devel] [PATCH v7 14/27] cputlb: tweak qemu_ram_addr_from_host_nofail reporting, Alex Bennée, 2017/01/19
[Qemu-devel] [PATCH v7 15/27] cputlb: introduce tlb_flush_* async work., Alex Bennée, 2017/01/19
[Qemu-devel] [PATCH v7 16/27] cputlb: add tlb_flush_by_mmuidx async routines, Alex Bennée, 2017/01/19