Re: [Qemu-devel] [PULL v2 00/22] QOM CPUState patch queue 2015-07-07

["Andreas Färber" <afaerber@suse.de>]

Am 08.07.2015 um 20:50 schrieb Peter Maydell:
> On 8 July 2015 at 18:39, Andreas Färber <afaerber@suse.de> wrote:
>> Am 08.07.2015 um 13:33 schrieb Peter Maydell:
>>> On 7 July 2015 at 18:16, Andreas Färber <afaerber@suse.de> wrote:
>>>> Hello Peter,
>>>>
>>>> This is my QOM CPU patch queue. Please pull.
>>>>
>>>> Note: For time reasons I did not give this queue as much testing as usual,
>>>> in particular BSD and non-x86 KVM hosts were not covered.
>>>>
>>>> Regards,
>>>> Andreas
>>>>
>>>> Cc: Peter Maydell <peter.maydell@linaro.org>
>>>>
>>>> Cc: Eduardo Habkost <ehabkost@redhat.com>
>>>> Cc: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
>>>>
>>>> The following changes since commit f2562fbb7ac54d597cfe05f613d30296d1850d1b:
>>>>
>>>>   Merge remote-tracking branch 'remotes/stefanha/tags/net-pull-request' into staging (2015-07-07 15:48:49 +0100)
>>>>
>>>> are available in the git repository at:
>>>>
>>>>   git://github.com/afaerber/qemu-cpu.git tags/qom-cpu-for-peter
>>>>
>>>> for you to fetch changes up to cf6f1442257d53cf617545dd150efe26771ec31c:
>>>>
>>>>   disas: cris: QOMify target specific disas setup (2015-07-07 18:35:39 +0200)
>>>>
>>>> ----------------------------------------------------------------
>>>> QOM CPUState and X86CPU
>>>>
>>>> * Further QOM'ification of CPU initialization
>>>> * Propagation of CPUState arguments and elimination of ENV_GET_CPU() usage
>>>> * cpu_set_pc() abstraction
>>>> * CPUClass::disas_set_info() hook
>>>
>>> I'm afraid this seems to break ppc linux-user somehow:
>>>
>>> e104462:trusty:linux-user-test-0.3$ gdb --args
>>> /home/petmay01/linaro/qemu-for-merges/build/all-linux-static/ppc-linux-user/qemu-ppc
>>> -L ./gnemul/qemu-ppc ppc/ls -l dummyfile
>>> GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
>>> Copyright (C) 2014 Free Software Foundation, Inc.
>>> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
>>> This is free software: you are free to change and redistribute it.
>>> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
>>> and "show warranty" for details.
>>> This GDB was configured as "x86_64-linux-gnu".
>>> Type "show configuration" for configuration details.
>>> For bug reporting instructions, please see:
>>> <http://www.gnu.org/software/gdb/bugs/>.
>>> Find the GDB manual and other documentation resources online at:
>>> <http://www.gnu.org/software/gdb/documentation/>.
>>> For help, type "help".
>>> Type "apropos word" to search for commands related to "word"...
>>> Reading symbols from
>>> /home/petmay01/linaro/qemu-for-merges/build/all-linux-static/ppc-linux-user/qemu-ppc...done.
>>> (gdb) handle SIGUSR1 pass noprint nostop
>>> Signal        Stop      Print   Pass to program Description
>>> SIGUSR1       No        No      Yes             User defined signal 1
>>> (gdb) r
>>> Starting program:
>>> /home/petmay01/linaro/qemu-for-merges/build/all-linux-static/ppc-linux-user/qemu-ppc
>>> -L ./gnemul/qemu-ppc ppc/ls -l dummyfile
>>> [Thread debugging using libthread_db enabled]
>>> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
>>> [New Thread 0x7ffff7ffc700 (LWP 22653)]
>>>
>>> Program received signal SIGSEGV, Segmentation fault.
>>> 0x000000006060dd85 in static_code_gen_buffer ()
>>> (gdb) bt
>>> #0  0x000000006060dd85 in static_code_gen_buffer ()
>>> #1  0x00000000600065e3 in cpu_tb_exec (cpu=0x6268ceb0,
>>>     tb_ptr=0x6060dd50 <static_code_gen_buffer+2992>
>>> "A\213n\374\205\355\017\205", <incomplete sequence \307>)
>>>     at /home/petmay01/linaro/qemu-for-merges/cpu-exec.c:200
>>> #2  0x0000000060006fbc in cpu_ppc_exec (cpu=0x6268ceb0) at
>>> /home/petmay01/linaro/qemu-for-merges/cpu-exec.c:518
>>> #3  0x0000000060049dc2 in cpu_loop (env=0x62695100) at
>>> /home/petmay01/linaro/qemu-for-merges/linux-user/main.c:1568
>>> #4  0x000000006004cac5 in main (argc=6, argv=0x7fffffffe3f8,
>>> envp=0x7fffffffe430)
>>>     at /home/petmay01/linaro/qemu-for-merges/linux-user/main.c:4408
>>
>> a7bebe297accafc0fa75a5f76767e6b856e6d5eb is the first bad commit
>> commit a7bebe297accafc0fa75a5f76767e6b856e6d5eb
>> Author: Bharata B Rao <bharata@linux.vnet.ibm.com>
>> Date:   Tue Jun 23 19:31:14 2015 -0700
>>
>>     target-ppc: Move cpu_exec_init() call to realize function
>>
>>     Move cpu_exec_init() call from instance_init to realize. This allows
>>     any failures from cpu_exec_init() to be handled appropriately.
>>     Also add corresponding cpu_exec_exit() call from unrealize.
>>
>>     cpu_dt_id assignment from instance_init is no longer needed since
>>     correct assignment for cpu_dt_id is already present in realizefn.
>>
>>     Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
>>     Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
>>     Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
>>     Acked-by: Paolo Bonzini <pbonzini@redhat.com>
>>     Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
>>     Signed-off-by: Andreas Färber <afaerber@suse.de>
>>
>> :040000 040000 9f5a59e2b3237877cb8940f744beeb5a304a5620
>> 171e8f34622f032c8d36c98eb3ee1f513ec6d5ef M      target-ppc
>>
>> Patch is fairly small, but I don't spot anything immediately.
> 
> The call to cpu_exec_init() appears to have been
> moved to inside an #if !defined(CONFIG_USER_ONLY) block...

Indeed, the following fixes it.

diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index 2b72f2d..82854a8 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -8927,12 +8927,15 @@ static void ppc_cpu_realizefn(DeviceState *dev,
Error **errp)
                    smp_threads, kvm_enabled() ? "KVM" : "TCG");
         return;
     }
+#endif

     cpu_exec_init(&cpu->env, &local_err);
     if (local_err != NULL) {
         error_propagate(errp, local_err);
         return;
     }
+
+#if !defined(CONFIG_USER_ONLY)
     cpu->cpu_dt_id = (cs->cpu_index / smp_threads) * max_smt
         + (cs->cpu_index % smp_threads);
 #endif

Thanks,
Andreas

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