accel/hvf: Trace VM memory mapping

Trace memory mapped / unmapped in the guest.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250623121845.7214-8-philmd@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

accel/hvf/hvf-accel-ops.c

@@ -59,6 +59,7 @@
 #include "system/hvf_int.h"
 #include "system/runstate.h"
 #include "qemu/guest-random.h"
+#include "trace.h"
 
 HVFState *hvf_state;
 
@@ -97,6 +98,7 @@ static int do_hvf_set_memory(hvf_slot *slot, hv_memory_flags_t flags)
     if (macslot->present) {
         if (macslot->size != slot->size) {
             macslot->present = 0;
+            trace_hvf_vm_unmap(macslot->gpa_start, macslot->size);
             ret = hv_vm_unmap(macslot->gpa_start, macslot->size);
             assert_hvf_ok(ret);
         }
@@ -109,6 +111,10 @@ static int do_hvf_set_memory(hvf_slot *slot, hv_memory_flags_t flags)
     macslot->present = 1;
     macslot->gpa_start = slot->start;
     macslot->size = slot->size;
+    trace_hvf_vm_map(slot->start, slot->size, slot->mem, flags,
+                     flags & HV_MEMORY_READ ?  'R' : '-',
+                     flags & HV_MEMORY_WRITE ? 'W' : '-',
+                     flags & HV_MEMORY_EXEC ?  'E' : '-');
     ret = hv_vm_map(slot->mem, slot->start, slot->size, flags);
     assert_hvf_ok(ret);
     return 0;

accel/hvf/trace-events

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# See docs/devel/tracing.rst for syntax documentation.
+
+# hvf-accel-ops.c
+hvf_vm_map(uint64_t paddr, uint64_t size, void *vaddr, uint8_t flags, const char r, const char w, const char e) "paddr:0x%016"PRIx64" size:0x%08"PRIx64" vaddr:%p flags:0x%02x/%c%c%c"
+hvf_vm_unmap(uint64_t paddr, uint64_t size) "paddr:0x%016"PRIx64" size:0x%08"PRIx64

accel/hvf/trace.h

@@ -0,0 +1,2 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#include "trace/trace-accel_hvf.h"

meson.build

@@ -3630,6 +3630,7 @@ if have_block
 endif
 if have_system
   trace_events_subdirs += [
+    'accel/hvf',
     'accel/kvm',
     'audio',
     'backends',