[PULL 13/14] q35: increase default tseg size

["Michael S. Tsirkin" <mst@redhat.com>]

From: Gerd Hoffmann <kraxel@redhat.com>

With virtual machines becoming larger (more CPUs, more memory) the
memory needed by the SMM code in OVMF to manage page tables and vcpu
state grows too.

Default SMM memory (aka TSEG) size is 16 MB, and this often is not
enough.  Bump it to 64 MB for new machine types.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20251106105640.1642109-1-kraxel@redhat.com>
---
 hw/i386/pc.c      | 4 +++-
 hw/pci-host/q35.c | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 4d6bcbb846..f8b919cb6c 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -81,7 +81,9 @@
     { "qemu64-" TYPE_X86_CPU, "model-id", "QEMU Virtual CPU version " v, },\
     { "athlon-" TYPE_X86_CPU, "model-id", "QEMU Virtual CPU version " v, },
 
-GlobalProperty pc_compat_10_1[] = {};
+GlobalProperty pc_compat_10_1[] = {
+    { "mch", "extended-tseg-mbytes", "16" },
+};
 const size_t pc_compat_10_1_len = G_N_ELEMENTS(pc_compat_10_1);
 
 GlobalProperty pc_compat_10_0[] = {
diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
index 1951ae440c..a708758d36 100644
--- a/hw/pci-host/q35.c
+++ b/hw/pci-host/q35.c
@@ -663,7 +663,7 @@ static void mch_realize(PCIDevice *d, Error **errp)
 
 static const Property mch_props[] = {
     DEFINE_PROP_UINT16("extended-tseg-mbytes", MCHPCIState, ext_tseg_mbytes,
-                       16),
+                       64),
     DEFINE_PROP_BOOL("smbase-smram", MCHPCIState, has_smram_at_smbase, true),
 };
 
-- 
MST