[Qemu-devel] [PATCH qemu] loader: Trace loaded images

[Alexey Kardashevskiy <aik@ozlabs.ru>]

This adds a trace point which prints every loaded image. This includes
bios/firmware/kernel/initradmdisk/pcirom.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---

The example for a pseries guest:

loader_write_rom slof.bin: @0x0 size=0xe22e0 ROM=0
loader_write_rom phdr #0: /home/aik/t/vml4120le: @0x400000 size=0x13df000 ROM=0
loader_write_rom /home/aik/t/le.cpio: @0x1ad0000 size=0x9463a00 ROM=0

Sadly "spapr-rtas.bin" does not show up because it is loaded from
the spapr machine reset handler rather than via rom_reset(), may be needs
to be fixed.

---
 Makefile.objs        | 1 +
 hw/core/loader.c     | 3 +++
 hw/core/trace-events | 2 ++
 3 files changed, 6 insertions(+)
 create mode 100644 hw/core/trace-events

diff --git a/Makefile.objs b/Makefile.objs
index c8337fa34be8..036ca6752908 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -200,6 +200,7 @@ trace-events-subdirs += target/riscv
 trace-events-subdirs += target/s390x
 trace-events-subdirs += target/sparc
 trace-events-subdirs += util
+trace-events-subdirs += hw/core
 
 trace-events-files = $(SRC_PATH)/trace-events $(trace-events-subdirs:%=$(SRC_PATH)/%/trace-events)
 
diff --git a/hw/core/loader.c b/hw/core/loader.c
index a097bbe30a74..7fe083af492f 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -44,6 +44,7 @@
 
 #include "qemu/osdep.h"
 #include "qapi/error.h"
+#include "trace.h"
 #include "hw/hw.h"
 #include "disas/disas.h"
 #include "monitor/monitor.h"
@@ -1114,6 +1115,8 @@ static void rom_reset(void *unused)
          * CPU definitely fetches its instructions from the just written data.
          */
         cpu_flush_icache_range(rom->addr, rom->datasize);
+
+        trace_loader_write_rom(rom->name, rom->addr, rom->datasize, rom->isrom);
     }
 }
 
diff --git a/hw/core/trace-events b/hw/core/trace-events
new file mode 100644
index 000000000000..fe47a9c8cb1f
--- /dev/null
+++ b/hw/core/trace-events
@@ -0,0 +1,2 @@
+# loader.c
+loader_write_rom(const char *name, uint64_t gpa, uint64_t size, bool isrom) "%s: @0x%"PRIx64" size=0x%"PRIx64" ROM=%d"
-- 
2.17.1