icount: fix cpu_restore_state_from_tb for non-tb-exit cases

In icount mode, instructions that access io memory spaces in the middle
of the translation block invoke TB recompilation.  After recompilation,
such instructions become last in the TB and are allowed to access io
memory spaces.

When the code includes instruction like i386 'xchg eax, 0xffffd080'
which accesses APIC, QEMU goes into an infinite loop of the recompilation.

This instruction includes two memory accesses - one read and one write.
After the first access, APIC calls cpu_report_tpr_access, which restores
the CPU state to get the current eip.  But cpu_restore_state_from_tb
resets the cpu->can_do_io flag which makes the second memory access invalid.
Therefore the second memory access causes a recompilation of the block.
Then these operations repeat again and again.

This patch moves resetting cpu->can_do_io flag from
cpu_restore_state_from_tb to cpu_loop_exit* functions.

It also adds a parameter for cpu_restore_state which controls restoring
icount.  There is no need to restore icount when we only query CPU state
without breaking the TB.  Restoring it in such cases leads to the
incorrect flow of the virtual time.

In most cases new parameter is true (icount should be recalculated).
But there are two cases in i386 and openrisc when the CPU state is only
queried without the need to break the TB.  This patch fixes both of
these cases.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Message-Id: <20180409091320.12504.35329.stgit@pasha-VirtualBox>
[rth: Make can_do_io setting unconditional; move from cpu_exec;
make cpu_loop_exit_{noexc,restore} call cpu_loop_exit.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index e5afd2e6d3..bd68328ed9 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -50,13 +50,16 @@ void cpu_gen_init(void);
  * cpu_restore_state:
  * @cpu: the vCPU state is to be restore to
  * @searched_pc: the host PC the fault occurred at
+ * @will_exit: true if the TB executed will be interrupted after some
+               cpu adjustments. Required for maintaining the correct
+               icount valus
  * @return: true if state was restored, false otherwise
  *
  * Attempt to restore the state for a fault occurring in translated
  * code. If the searched_pc is not in translated code no state is
  * restored and the function returns false.
  */
-bool cpu_restore_state(CPUState *cpu, uintptr_t searched_pc);
+bool cpu_restore_state(CPUState *cpu, uintptr_t searched_pc, bool will_exit);
 
 void QEMU_NORETURN cpu_loop_exit_noexc(CPUState *cpu);
 void QEMU_NORETURN cpu_io_recompile(CPUState *cpu, uintptr_t retaddr);