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-rw-r--r--cpu-exec.c2
-rw-r--r--cpus.c2
-rw-r--r--include/exec/exec-all.h21
-rw-r--r--include/qom/cpu.h4
-rw-r--r--qom/cpu.c2
-rw-r--r--softmmu_template.h4
-rw-r--r--translate-all.c3
7 files changed, 10 insertions, 28 deletions
diff --git a/cpu-exec.c b/cpu-exec.c
index 407fa47..713540f 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -196,7 +196,7 @@ static inline tcg_target_ulong cpu_tb_exec(CPUState *cpu, uint8_t *tb_ptr)
}
#endif /* DEBUG_DISAS */
- cpu->can_do_io = 0;
+ cpu->can_do_io = !use_icount;
next_tb = tcg_qemu_tb_exec(env, tb_ptr);
cpu->can_do_io = 1;
trace_exec_tb_exit((void *) (next_tb & ~TB_EXIT_MASK),
diff --git a/cpus.c b/cpus.c
index a822ce3..c1e74d9 100644
--- a/cpus.c
+++ b/cpus.c
@@ -145,7 +145,7 @@ int64_t cpu_get_icount_raw(void)
icount = timers_state.qemu_icount;
if (cpu) {
- if (!cpu_can_do_io(cpu)) {
+ if (!cpu->can_do_io) {
fprintf(stderr, "Bad icount read\n");
exit(1);
}
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index 8427225..29775c0 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -346,27 +346,6 @@ extern int singlestep;
/* cpu-exec.c */
extern volatile sig_atomic_t exit_request;
-/**
- * cpu_can_do_io:
- * @cpu: The CPU for which to check IO.
- *
- * Deterministic execution requires that IO only be performed on the last
- * instruction of a TB so that interrupts take effect immediately.
- *
- * Returns: %true if memory-mapped IO is safe, %false otherwise.
- */
-static inline bool cpu_can_do_io(CPUState *cpu)
-{
- if (!use_icount) {
- return true;
- }
- /* If not executing code then assume we are ok. */
- if (cpu->current_tb == NULL) {
- return true;
- }
- return cpu->can_do_io != 0;
-}
-
#if !defined(CONFIG_USER_ONLY)
void migration_bitmap_extend(ram_addr_t old, ram_addr_t new);
#endif
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index 20aabc9..39712ab 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -231,7 +231,9 @@ struct kvm_run;
* @icount_decr: Number of cycles left, with interrupt flag in high bit.
* This allows a single read-compare-cbranch-write sequence to test
* for both decrementer underflow and exceptions.
- * @can_do_io: Nonzero if memory-mapped IO is safe.
+ * @can_do_io: Nonzero if memory-mapped IO is safe. Deterministic execution
+ * requires that IO only be performed on the last instruction of a TB
+ * so that interrupts take effect immediately.
* @env_ptr: Pointer to subclass-specific CPUArchState field.
* @current_tb: Currently executing TB.
* @gdb_regs: Additional GDB registers.
diff --git a/qom/cpu.c b/qom/cpu.c
index eb9cfec..62f4b5d 100644
--- a/qom/cpu.c
+++ b/qom/cpu.c
@@ -247,7 +247,7 @@ static void cpu_common_reset(CPUState *cpu)
cpu->mem_io_vaddr = 0;
cpu->icount_extra = 0;
cpu->icount_decr.u32 = 0;
- cpu->can_do_io = 0;
+ cpu->can_do_io = 1;
cpu->exception_index = -1;
memset(cpu->tb_jmp_cache, 0, TB_JMP_CACHE_SIZE * sizeof(void *));
}
diff --git a/softmmu_template.h b/softmmu_template.h
index d42d89d..50dec1c 100644
--- a/softmmu_template.h
+++ b/softmmu_template.h
@@ -154,7 +154,7 @@ static inline DATA_TYPE glue(io_read, SUFFIX)(CPUArchState *env,
physaddr = (physaddr & TARGET_PAGE_MASK) + addr;
cpu->mem_io_pc = retaddr;
- if (mr != &io_mem_rom && mr != &io_mem_notdirty && !cpu_can_do_io(cpu)) {
+ if (mr != &io_mem_rom && mr != &io_mem_notdirty && !cpu->can_do_io) {
cpu_io_recompile(cpu, retaddr);
}
@@ -374,7 +374,7 @@ static inline void glue(io_write, SUFFIX)(CPUArchState *env,
MemoryRegion *mr = iotlb_to_region(cpu, physaddr);
physaddr = (physaddr & TARGET_PAGE_MASK) + addr;
- if (mr != &io_mem_rom && mr != &io_mem_notdirty && !cpu_can_do_io(cpu)) {
+ if (mr != &io_mem_rom && mr != &io_mem_notdirty && !cpu->can_do_io) {
cpu_io_recompile(cpu, retaddr);
}
diff --git a/translate-all.c b/translate-all.c
index 755cdab..9c46ffa 100644
--- a/translate-all.c
+++ b/translate-all.c
@@ -222,6 +222,7 @@ static int cpu_restore_state_from_tb(CPUState *cpu, TranslationBlock *tb,
gen_intermediate_code_pc(env, tb);
if (tb->cflags & CF_USE_ICOUNT) {
+ assert(use_icount);
/* Reset the cycle counter to the start of the block. */
cpu->icount_decr.u16.low += tb->icount;
/* Clear the IO flag. */
@@ -1470,7 +1471,7 @@ static void tcg_handle_interrupt(CPUState *cpu, int mask)
if (use_icount) {
cpu->icount_decr.u16.high = 0xffff;
- if (!cpu_can_do_io(cpu)
+ if (!cpu->can_do_io
&& (mask & ~old_mask) != 0) {
cpu_abort(cpu, "Raised interrupt while not in I/O function");
}
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