Add compile time config option for the guest hint default value.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 src/fw/paravirt.c | 2 +-
 src/Kconfig       | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c
index fbd00f1c072f..001be7caf102 100644
--- a/src/fw/paravirt.c
+++ b/src/fw/paravirt.c
@@ -37,7 +37,7 @@ u8 CPUPhysBits;
 // 64bit processor
 u8 CPULongMode;
 // memory layout hint (32bit or 64bit guests).
-u8 GuestHint = 32;
+u8 GuestHint = CONFIG_DEFAULT_GUEST_HINT;
 // Type of emulator platform.
 int PlatformRunningOn VARFSEG;
 // cfg enabled
diff --git a/src/Kconfig b/src/Kconfig
index 3a8ffa15fded..7c8104f01718 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -478,6 +478,13 @@ menu "BIOS interfaces"
         help
             Provide TPM support along with TCG BIOS extensions
 
+    config DEFAULT_GUEST_HINT
+        int "tweak default config for 32-bit or 64-bit guests"
+        default 32
+        help
+            Optimize memory layout (specifically the placement
+            of pci bars) for 32-bit or 64-bit guests.
+
 endmenu
 
 menu "BIOS Tables"
-- 
2.47.0

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