diff mbox series

[PULL,5/6] accel/tcg: Always set CF_LAST_IO with CF_NOIRQ

Message ID 20230928194156.237351-6-richard.henderson@linaro.org
State Accepted
Commit 200c1f904f46c209cb022e711a48b89e46512902
Headers show
Series [PULL,1/6] accel/tcg: Avoid load of icount_decr if unused | expand

Commit Message

Richard Henderson Sept. 28, 2023, 7:41 p.m. UTC 
Without this we can get see loops through cpu_io_recompile,
in which the cpu makes no progress.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 accel/tcg/cpu-exec.c | 2 +-
 accel/tcg/tb-maint.c | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
index e2c494e75e..c724e8b6f1 100644
--- a/accel/tcg/cpu-exec.c
+++ b/accel/tcg/cpu-exec.c
@@ -720,7 +720,7 @@  static inline bool cpu_handle_exception(CPUState *cpu, int *ret)
             && cpu_neg(cpu)->icount_decr.u16.low + cpu->icount_extra == 0) {
             /* Execute just one insn to trigger exception pending in the log */
             cpu->cflags_next_tb = (curr_cflags(cpu) & ~CF_USE_ICOUNT)
-                | CF_NOIRQ | 1;
+                | CF_LAST_IO | CF_NOIRQ | 1;
         }
 #endif
         return false;
diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
index 32ae8af61c..0c3e227409 100644
--- a/accel/tcg/tb-maint.c
+++ b/accel/tcg/tb-maint.c
@@ -1083,7 +1083,8 @@  bool tb_invalidate_phys_page_unwind(tb_page_addr_t addr, uintptr_t pc)
     if (current_tb_modified) {
         /* Force execution of one insn next time.  */
         CPUState *cpu = current_cpu;
-        cpu->cflags_next_tb = 1 | CF_NOIRQ | curr_cflags(current_cpu);
+        cpu->cflags_next_tb =
+            1 | CF_LAST_IO | CF_NOIRQ | curr_cflags(current_cpu);
         return true;
     }
     return false;
@@ -1153,7 +1154,8 @@  tb_invalidate_phys_page_range__locked(struct page_collection *pages,
     if (current_tb_modified) {
         page_collection_unlock(pages);
         /* Force execution of one insn next time.  */
-        current_cpu->cflags_next_tb = 1 | CF_NOIRQ | curr_cflags(current_cpu);
+        current_cpu->cflags_next_tb =
+            1 | CF_LAST_IO | CF_NOIRQ | curr_cflags(current_cpu);
         mmap_unlock();
         cpu_loop_exit_noexc(current_cpu);
     }