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[Qemu-devel] [PATCH v11 12/24] tcg: handle EXCP_ATOMIC exception for sys
From: |
Alex Bennée |
Subject: |
[Qemu-devel] [PATCH v11 12/24] tcg: handle EXCP_ATOMIC exception for system emulation |
Date: |
Thu, 9 Feb 2017 17:08:52 +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 25897edbd3..cb44544fcf 100644
--- a/cpus.c
+++ b/cpus.c
@@ -1347,6 +1347,11 @@ 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) {
@@ -1457,6 +1462,10 @@ 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 v11 06/24] tcg: add kick timer for single-threaded vCPU emulation, (continued)
- [Qemu-devel] [PATCH v11 06/24] tcg: add kick timer for single-threaded vCPU emulation, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 03/24] mttcg: Add missing tb_lock/unlock() in cpu_exec_step(), Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 04/24] tcg: move TCG_MO/BAR types into own file, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 09/24] tcg: remove global exit_request, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 01/24] docs: new design document multi-thread-tcg.txt, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 05/24] tcg: add options for enabling MTTCG, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 14/24] cputlb: tweak qemu_ram_addr_from_host_nofail reporting, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 11/24] tcg: enable thread-per-vCPU, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 10/24] tcg: enable tb_lock() for SoftMMU, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 13/24] cputlb: add assert_cpu_is_self checks, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 12/24] tcg: handle EXCP_ATOMIC exception for system emulation,
Alex Bennée <=
- [Qemu-devel] [PATCH v11 08/24] tcg: drop global lock during TCG code execution, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 07/24] tcg: rename tcg_current_cpu to tcg_current_rr_cpu, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 15/24] cputlb: introduce tlb_flush_* async work., Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 16/24] cputlb and arm/sparc targets: convert mmuidx flushes from varg to bitmap, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 19/24] cputlb: introduce tlb_flush_*_all_cpus[_synced], Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 18/24] cputlb: atomically update tlb fields used by tlb_reset_dirty, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 21/24] target-arm: don't generate WFE/YIELD calls for MTTCG, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 17/24] cputlb: add tlb_flush_by_mmuidx async routines, Alex Bennée, 2017/02/09
- [Qemu-devel] [PATCH v11 23/24] hw/misc/imx6_src: defer clearing of SRC_SCR reset bits, Alex Bennée, 2017/02/09