qemu: fix invalid memmap when max IPA size unknown

Author: osy

patches/qemu-9.1.2-utm.patch

@@ -1123,3 +1123,36 @@ index a63a7763a0..141fd35300 100644
 -- 
 2.41.0
 
+From 6aca8e564507533c53258abf08c0d283ccb207b7 Mon Sep 17 00:00:00 2001
+From: Joelle van Dyne <j@getutm.app>
+Date: Mon, 23 Dec 2024 00:15:08 -0800
+Subject: [PATCH v3 3/3] hw/arm/virt: handle hvf with unknown max IPA size
+
+When it is not possible to determine the max IPA bit size, the helper
+function will return 0. We do not try to set up the memmap in this case
+and instead fall back to the default in machvirt_init().
+
+Signed-off-by: Joelle van Dyne <j@getutm.app>
+---
+ hw/arm/virt.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/hw/arm/virt.c b/hw/arm/virt.c
+index f9b3380815..8c431e24b3 100644
+--- a/hw/arm/virt.c
++++ b/hw/arm/virt.c
+@@ -3053,6 +3053,11 @@ static int virt_hvf_get_physical_address_range(MachineState *ms)
+     int default_ipa_size = hvf_arm_get_default_ipa_bit_size();
+     int max_ipa_size = hvf_arm_get_max_ipa_bit_size();
+ 
++    /* Unknown max ipa size, we'll let the caller figure it out */
++    if (max_ipa_size == 0) {
++        return 0;
++    }
++
+     /* We freeze the memory map to compute the highest gpa */
+     virt_set_memmap(vms, max_ipa_size);
+ 
+-- 
+2.41.0
+