[PATCH 0/2] hw/core: Move hw_error() out of cpus.c

[PATCH 0/2] hw/core: Move hw_error() out of cpus.c

[Philippe Mathieu-Daudé]

Move hw_error() out of cpus.c because we already have cpu_abort()
there.

Philippe Mathieu-Daudé (2):
  cpus: Do not dump CPU state when calling hw_error()
  hw/core: Move hw_error() out of cpus.c

 hw/core/error.c     | 38 ++++++++++++++++++++++++++++++++++++++
 softmmu/cpus.c      | 17 -----------------
 hw/core/meson.build |  1 +
 3 files changed, 39 insertions(+), 17 deletions(-)
 create mode 100644 hw/core/error.c

-- 
2.26.2

[PATCH 1/2] cpus: Do not dump CPU state when calling hw_error()

[Philippe Mathieu-Daudé]

We already have cpu_abort() to dump CPU states and abort.

Restrict hw_error() to peripheral errors, hoping we can completely
remove it by proper functions from "error-report.h" in the future.

Suggested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 softmmu/cpus.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/softmmu/cpus.c b/softmmu/cpus.c
index a802e899abb..c96a04d7f18 100644
--- a/softmmu/cpus.c
+++ b/softmmu/cpus.c
@@ -913,16 +913,11 @@ static void stop_tcg_kick_timer(void)
 void hw_error(const char *fmt, ...)
 {
     va_list ap;
-    CPUState *cpu;
 
     va_start(ap, fmt);
     fprintf(stderr, "qemu: hardware error: ");
     vfprintf(stderr, fmt, ap);
     fprintf(stderr, "\n");
-    CPU_FOREACH(cpu) {
-        fprintf(stderr, "CPU #%d:\n", cpu->cpu_index);
-        cpu_dump_state(cpu, stderr, CPU_DUMP_FPU);
-    }
     va_end(ap);
     abort();
 }
-- 
2.26.2

Re: [PATCH 1/2] cpus: Do not dump CPU state when calling hw_error()

[Thomas Huth]

On 01/09/2020 13.23, Philippe Mathieu-Daudé wrote:
> We already have cpu_abort() to dump CPU states and abort.
> 
> Restrict hw_error() to peripheral errors, hoping we can completely
> remove it by proper functions from "error-report.h" in the future.
> 
> Suggested-by: Thomas Huth <thuth@redhat.com>

IIRC I rather suggested to rename the function to "cpu_hw_error" and
only use it for real CPU problems...
But I think your approach here is fine as well. Please replace the
"Suggested-by" with "Reviewed-by" now :-)

 Thomas


> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
>  softmmu/cpus.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/softmmu/cpus.c b/softmmu/cpus.c
> index a802e899abb..c96a04d7f18 100644
> --- a/softmmu/cpus.c
> +++ b/softmmu/cpus.c
> @@ -913,16 +913,11 @@ static void stop_tcg_kick_timer(void)
>  void hw_error(const char *fmt, ...)
>  {
>      va_list ap;
> -    CPUState *cpu;
>  
>      va_start(ap, fmt);
>      fprintf(stderr, "qemu: hardware error: ");
>      vfprintf(stderr, fmt, ap);
>      fprintf(stderr, "\n");
> -    CPU_FOREACH(cpu) {
> -        fprintf(stderr, "CPU #%d:\n", cpu->cpu_index);
> -        cpu_dump_state(cpu, stderr, CPU_DUMP_FPU);
> -    }

You could argue that cpu_abort() only prints the state of one CPU and
not of all. But I doubt that dumping the state of *all* CPUs is really
helpful in any of the contexts where hw_error() is used. So I think it's
fine to remove this CPU_FOREACH loop here.

>      va_end(ap);
>      abort();
>  }
> 

Re: [PATCH 1/2] cpus: Do not dump CPU state when calling hw_error()

[Philippe Mathieu-Daudé]

On 9/2/20 8:33 AM, Thomas Huth wrote:
> On 01/09/2020 13.23, Philippe Mathieu-Daudé wrote:
>> We already have cpu_abort() to dump CPU states and abort.
>>
>> Restrict hw_error() to peripheral errors, hoping we can completely
>> remove it by proper functions from "error-report.h" in the future.
>>
>> Suggested-by: Thomas Huth <thuth@redhat.com>
> 
> IIRC I rather suggested to rename the function to "cpu_hw_error" and
> only use it for real CPU problems...
> But I think your approach here is fine as well. Please replace the
> "Suggested-by" with "Reviewed-by" now :-)
> 
>  Thomas
> 
> 
>> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
>> ---
>>  softmmu/cpus.c | 5 -----
>>  1 file changed, 5 deletions(-)
>>
>> diff --git a/softmmu/cpus.c b/softmmu/cpus.c
>> index a802e899abb..c96a04d7f18 100644
>> --- a/softmmu/cpus.c
>> +++ b/softmmu/cpus.c
>> @@ -913,16 +913,11 @@ static void stop_tcg_kick_timer(void)
>>  void hw_error(const char *fmt, ...)
>>  {
>>      va_list ap;
>> -    CPUState *cpu;
>>  
>>      va_start(ap, fmt);
>>      fprintf(stderr, "qemu: hardware error: ");
>>      vfprintf(stderr, fmt, ap);
>>      fprintf(stderr, "\n");
>> -    CPU_FOREACH(cpu) {
>> -        fprintf(stderr, "CPU #%d:\n", cpu->cpu_index);
>> -        cpu_dump_state(cpu, stderr, CPU_DUMP_FPU);
>> -    }
> 
> You could argue that cpu_abort() only prints the state of one CPU and
> not of all. But I doubt that dumping the state of *all* CPUs is really
> helpful in any of the contexts where hw_error() is used. So I think it's
> fine to remove this CPU_FOREACH loop here.

I find this not very practical when using more than 8 vCPUs.
Personally I stopped looking at this output because it is too noisy.

Are there developers interested in having cpu_abort() dumping all
vCPU registers? I can move that there. Or the interested ones can
also do it later if they find it useful :)

> 
>>      va_end(ap);
>>      abort();
>>  }
>>
> 
> 

[PATCH 2/2] hw/core: Move hw_error() out of cpus.c

[Philippe Mathieu-Daudé]

As hw_error() is unrelated to CPU error - for which we have
cpu_abort() - move it out of cpus.c, under the hw/ directory.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
Couldn't find better file/name to put it in...
---
 hw/core/error.c     | 38 ++++++++++++++++++++++++++++++++++++++
 softmmu/cpus.c      | 12 ------------
 hw/core/meson.build |  1 +
 3 files changed, 39 insertions(+), 12 deletions(-)
 create mode 100644 hw/core/error.c

diff --git a/hw/core/error.c b/hw/core/error.c
new file mode 100644
index 00000000000..5a783c82dff
--- /dev/null
+++ b/hw/core/error.c
@@ -0,0 +1,38 @@
+/*
+ * Peripheral error reporting
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/hw.h"
+
+void hw_error(const char *fmt, ...)
+{
+    va_list ap;
+
+    va_start(ap, fmt);
+    fprintf(stderr, "qemu: hardware error: ");
+    vfprintf(stderr, fmt, ap);
+    fprintf(stderr, "\n");
+    va_end(ap);
+    abort();
+}
diff --git a/softmmu/cpus.c b/softmmu/cpus.c
index c96a04d7f18..eca57c76c9b 100644
--- a/softmmu/cpus.c
+++ b/softmmu/cpus.c
@@ -59,7 +59,6 @@
 #include "sysemu/replay.h"
 #include "sysemu/runstate.h"
 #include "hw/boards.h"
-#include "hw/hw.h"
 
 #include "sysemu/cpu-throttle.h"
 
@@ -910,17 +909,6 @@ static void stop_tcg_kick_timer(void)
 }
 
 /***********************************************************/
-void hw_error(const char *fmt, ...)
-{
-    va_list ap;
-
-    va_start(ap, fmt);
-    fprintf(stderr, "qemu: hardware error: ");
-    vfprintf(stderr, fmt, ap);
-    fprintf(stderr, "\n");
-    va_end(ap);
-    abort();
-}
 
 void cpu_synchronize_all_states(void)
 {
diff --git a/hw/core/meson.build b/hw/core/meson.build
index fc91f980758..99466dc93fd 100644
--- a/hw/core/meson.build
+++ b/hw/core/meson.build
@@ -1,6 +1,7 @@
 # core qdev-related obj files, also used by *-user and unit tests
 hwcore_files = files(
   'bus.c',
+  'error.c',
   'fw-path-provider.c',
   'hotplug.c',
   'qdev-properties.c',
-- 
2.26.2

Re: [PATCH 2/2] hw/core: Move hw_error() out of cpus.c

[Thomas Huth]

On 01/09/2020 13.23, Philippe Mathieu-Daudé wrote:
> As hw_error() is unrelated to CPU error - for which we have
> cpu_abort() - move it out of cpus.c, under the hw/ directory.
> 
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
> Couldn't find better file/name to put it in...
> ---
>  hw/core/error.c     | 38 ++++++++++++++++++++++++++++++++++++++
>  softmmu/cpus.c      | 12 ------------
>  hw/core/meson.build |  1 +
>  3 files changed, 39 insertions(+), 12 deletions(-)
>  create mode 100644 hw/core/error.c
> 
> diff --git a/hw/core/error.c b/hw/core/error.c
> new file mode 100644
> index 00000000000..5a783c82dff
> --- /dev/null
> +++ b/hw/core/error.c
> @@ -0,0 +1,38 @@
> +/*
> + * Peripheral error reporting
> + *
> + * Copyright (c) 2003-2008 Fabrice Bellard
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to deal
> + * in the Software without restriction, including without limitation the rights
> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> + * copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
> + * THE SOFTWARE.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "hw/hw.h"
> +
> +void hw_error(const char *fmt, ...)
> +{
> +    va_list ap;
> +
> +    va_start(ap, fmt);
> +    fprintf(stderr, "qemu: hardware error: ");
> +    vfprintf(stderr, fmt, ap);
> +    fprintf(stderr, "\n");
> +    va_end(ap);
> +    abort();
> +}
> diff --git a/softmmu/cpus.c b/softmmu/cpus.c
> index c96a04d7f18..eca57c76c9b 100644
> --- a/softmmu/cpus.c
> +++ b/softmmu/cpus.c
> @@ -59,7 +59,6 @@
>  #include "sysemu/replay.h"
>  #include "sysemu/runstate.h"
>  #include "hw/boards.h"
> -#include "hw/hw.h"
>  
>  #include "sysemu/cpu-throttle.h"
>  
> @@ -910,17 +909,6 @@ static void stop_tcg_kick_timer(void)
>  }
>  
>  /***********************************************************/
> -void hw_error(const char *fmt, ...)
> -{
> -    va_list ap;
> -
> -    va_start(ap, fmt);
> -    fprintf(stderr, "qemu: hardware error: ");
> -    vfprintf(stderr, fmt, ap);
> -    fprintf(stderr, "\n");
> -    va_end(ap);
> -    abort();
> -}
>  
>  void cpu_synchronize_all_states(void)
>  {
> diff --git a/hw/core/meson.build b/hw/core/meson.build
> index fc91f980758..99466dc93fd 100644
> --- a/hw/core/meson.build
> +++ b/hw/core/meson.build
> @@ -1,6 +1,7 @@
>  # core qdev-related obj files, also used by *-user and unit tests
>  hwcore_files = files(
>    'bus.c',
> +  'error.c',
>    'fw-path-provider.c',
>    'hotplug.c',
>    'qdev-properties.c',
> 

Reviewed-by: Thomas Huth <thuth@redhat.com>

Alternative ideas:

- Move the function as "static inline" into the header file
  instead - it's not so big, so an inline function should be
  ok here.

- Add a big fat warning comment to the header that this
  function should not be used for new code anymore.

 Thomas

Re: [PATCH 2/2] hw/core: Move hw_error() out of cpus.c

[Richard Henderson]

On 9/1/20 11:37 PM, Thomas Huth wrote:
> - Move the function as "static inline" into the header file
>   instead - it's not so big, so an inline function should be
>   ok here.

stdarg and inline do not mix.

> - Add a big fat warning comment to the header that this
>   function should not be used for new code anymore.

But certainly this.


r~

Re: [PATCH 2/2] hw/core: Move hw_error() out of cpus.c

[Philippe Mathieu-Daudé]

On 9/2/20 5:38 PM, Richard Henderson wrote:
> On 9/1/20 11:37 PM, Thomas Huth wrote:
>> - Move the function as "static inline" into the header file
>>   instead - it's not so big, so an inline function should be
>>   ok here.
> 
> stdarg and inline do not mix.
> 
>> - Add a big fat warning comment to the header that this
>>   function should not be used for new code anymore.
> 
> But certainly this.

Will do, but this has been proven to not work well...

> 
> 
> r~
> 

Re: [PATCH 2/2] hw/core: Move hw_error() out of cpus.c

[Thomas Huth]

On 02/09/2020 17.59, Philippe Mathieu-Daudé wrote:
> On 9/2/20 5:38 PM, Richard Henderson wrote:
>> On 9/1/20 11:37 PM, Thomas Huth wrote:
>>> - Move the function as "static inline" into the header file
>>>   instead - it's not so big, so an inline function should be
>>>   ok here.
>>
>> stdarg and inline do not mix.
>>
>>> - Add a big fat warning comment to the header that this
>>>   function should not be used for new code anymore.
>>
>> But certainly this.
> 
> Will do, but this has been proven to not work well...

... or add a warning to checkpatch.pl ?

 Thomas

Re: [PATCH 2/2] hw/core: Move hw_error() out of cpus.c

[Philippe Mathieu-Daudé]

On 9/2/20 6:02 PM, Thomas Huth wrote:
> On 02/09/2020 17.59, Philippe Mathieu-Daudé wrote:
>> On 9/2/20 5:38 PM, Richard Henderson wrote:
>>> On 9/1/20 11:37 PM, Thomas Huth wrote:
>>>> - Move the function as "static inline" into the header file
>>>>   instead - it's not so big, so an inline function should be
>>>>   ok here.
>>>
>>> stdarg and inline do not mix.
>>>
>>>> - Add a big fat warning comment to the header that this
>>>>   function should not be used for new code anymore.
>>>
>>> But certainly this.
>>
>> Will do, but this has been proven to not work well...
> 
> ... or add a warning to checkpatch.pl ?

This certainly works better :)

> 
>  Thomas
> 
> 

Re: [PATCH 0/2] hw/core: Move hw_error() out of cpus.c

[Richard Henderson]

On 9/1/20 4:23 AM, Philippe Mathieu-Daudé wrote:
> Move hw_error() out of cpus.c because we already have cpu_abort()
> there.
> 
> Philippe Mathieu-Daudé (2):
>   cpus: Do not dump CPU state when calling hw_error()
>   hw/core: Move hw_error() out of cpus.c

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~