[PATCH 1/4] fw_cfg: bump file slots to 40

[Laszlo Ersek <lersek@redhat.com>]

I count approximately 30 additions of named fw_cfg files, with
fw_cfg_add_file() / fw_cfg_add_file_callback() / fw_cfg_modify_file(). On
top of those, vgaroms/* and genroms/* files are added with invocations of
rom_add_vga() and rom_add_option().

While it's pretty unlikely that a QEMU cmdline causes all of those named
files to be added simultaneously, it now seems prudent to bump
FW_CFG_FILE_SLOTS_DFLT from 32 to a higher value. Increment it by 8.

Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1515
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
---
 hw/core/machine.c | 2 ++
 hw/nvram/fw_cfg.c | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/core/machine.c b/hw/core/machine.c
index 1689ad3bf8af..fefc9e1f0dd0 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -29,6 +29,8 @@
 
 GlobalProperty hw_compat_4_1[] = {
     { "virtio-pci", "x-pcie-flr-init", "off" },
+    { "fw_cfg_mem", "x-file-slots", "0x20" },
+    { "fw_cfg_io", "x-file-slots", "0x20" },
 };
 const size_t hw_compat_4_1_len = G_N_ELEMENTS(hw_compat_4_1);
 
diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index 7dc3ac378ee0..cd785fad93b1 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -40,7 +40,7 @@
 #include "qemu/cutils.h"
 #include "qapi/error.h"
 
-#define FW_CFG_FILE_SLOTS_DFLT 0x20
+#define FW_CFG_FILE_SLOTS_DFLT 0x28
 
 /* FW_CFG_VERSION bits */
 #define FW_CFG_VERSION      0x01
-- 
2.19.1.3.g30247aa5d201