console/win32: allocate shareable display surface

Introduce qemu_win32_map_alloc() and qemu_win32_map_free() to allocate
shared memory mapping. The handle can be used to share the mapping with
another process.

Teach qemu_create_displaysurface() to allocate shared memory. Following
patches will introduce other places for shared memory allocation.

Other patches for -display dbus will share the memory when possible with
the client, to avoid expensive memory copy between the processes.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20230606115658.677673-10-marcandre.lureau@redhat.com>

2 files changed, 37 insertions, 0 deletions

diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index fafbab80b4..429542face 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -835,3 +835,36 @@ int qemu_msync(void *addr, size_t length, int fd)
      */
     return qemu_fdatasync(fd);
 }
+
+void *qemu_win32_map_alloc(size_t size, HANDLE *h, Error **errp)
+{
+    void *bits;
+
+    trace_win32_map_alloc(size);
+
+    *h = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0,
+                          size, NULL);
+    if (*h == NULL) {
+        error_setg_win32(errp, GetLastError(), "Failed to CreateFileMapping");
+        return NULL;
+    }
+
+    bits = MapViewOfFile(*h, FILE_MAP_ALL_ACCESS, 0, 0, size);
+    if (bits == NULL) {
+        error_setg_win32(errp, GetLastError(), "Failed to MapViewOfFile");
+        CloseHandle(*h);
+        return NULL;
+    }
+
+    return bits;
+}
+
+void qemu_win32_map_free(void *ptr, HANDLE h, Error **errp)
+{
+    trace_win32_map_free(ptr, h);
+
+    if (UnmapViewOfFile(ptr) == 0) {
+        error_setg_win32(errp, GetLastError(), "Failed to UnmapViewOfFile");
+    }
+    CloseHandle(h);
+}
diff --git a/util/trace-events b/util/trace-events
index 3f7e766683..49a4962e18 100644
--- a/util/trace-events
+++ b/util/trace-events
@@ -52,6 +52,10 @@ qemu_anon_ram_alloc(size_t size, void *ptr) "size %zu ptr %p"
 qemu_vfree(void *ptr) "ptr %p"
 qemu_anon_ram_free(void *ptr, size_t size) "ptr %p size %zu"
 
+# oslib-win32.c
+win32_map_alloc(size_t size) "size:%zd"
+win32_map_free(void *ptr, void *h) "ptr:%p handle:%p"
+
 # hbitmap.c
 hbitmap_iter_skip_words(const void *hb, void *hbi, uint64_t pos, unsigned long cur) "hb %p hbi %p pos %"PRId64" cur 0x%lx"
 hbitmap_reset(void *hb, uint64_t start, uint64_t count, uint64_t sbit, uint64_t ebit) "hb %p items %"PRIu64",%"PRIu64" bits %"PRIu64"..%"PRIu64