Read the ipa-granule property (set by hvf_accel_init) and configure
the HVF stage-2 translation granule via hv_vm_config_set_ipa_granule()
on macOS 26+.  When ipa-granule=4k, use HV_IPA_GRANULE_4KB to allow
HVF to map memory at 4KB granularity, matching 4KB-page guests on
hosts with larger page sizes.

If macOS < 26 and a sub-host-page granule was requested, warn and
fall back to the host page size.

Signed-off-by: Lucas Amaral <lucaaamaral@gmail.com>
---
 target/arm/hvf/hvf.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
index 1ba5bbf3..e3b1e3e1 100644
--- a/target/arm/hvf/hvf.c
+++ b/target/arm/hvf/hvf.c
@@ -1269,6 +1269,38 @@ hv_return_t hvf_arch_vm_create(MachineState *ms, uint32_t pa_range)
     }
     chosen_ipa_bit_size = pa_range;
 
+    /*
+     * Configure IPA granule from the ipa-granule property.
+     * hvf_get_map_granule() was set by hvf_accel_init() before this call.
+     */
+    {
+        uint64_t granule = hvf_get_map_granule();
+        bool granule_set = false;
+
+#if defined(__MAC_OS_X_VERSION_MAX_ALLOWED) && \
+    (__MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_26_0)
+        if (__builtin_available(macOS 26, *)) {
+            hv_ipa_granule_t hv_gran = (granule <= 4 * KiB)
+                ? HV_IPA_GRANULE_4KB : HV_IPA_GRANULE_16KB;
+            ret = hv_vm_config_set_ipa_granule(config, hv_gran);
+            if (ret != HV_SUCCESS) {
+                error_report("HVF: failed to set IPA granule: %s",
+                             hvf_return_string(ret));
+                goto cleanup;
+            }
+            granule_set = true;
+        }
+#endif
+
+        if (!granule_set && granule < qemu_real_host_page_size()) {
+            warn_report("HVF: ipa-granule=%zuKB requested but macOS < 26; "
+                        "falling back to host page size (%zuKB)",
+                        (size_t)(granule / KiB),
+                        (size_t)(qemu_real_host_page_size() / KiB));
+            hvf_set_map_granule(qemu_real_host_page_size());
+        }
+    }
+
     ret = hv_vm_create(config);
 
 cleanup:
-- 
2.52.0