[PATCH 2/2] target/arm/hvf: set 4KB IPA granule on macOS 26

[Lucas Amaral <lucaaamaral@gmail.com>]

macOS 26 introduces hv_vm_config_set_ipa_granule() which allows
configuring 4KB IPA granularity for HVF virtual machines.  This
enables hv_vm_map() to accept 4KB-aligned addresses, matching
the guest kernel's page size.

Without this, virtio-gpu blob BAR offsets that are 4KB-aligned but
not 16KB-aligned cannot be mapped into the guest, falling back to
slow MMIO emulation.

Gated behind MAC_OS_VERSION_26_0 compile-time and __builtin_available
runtime checks.  Falls back to the default 16KB granule on older
macOS versions.

Signed-off-by: Lucas Amaral <lucaaamaral@gmail.com>
---
 target/arm/hvf/hvf.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
index 87ddcdb..b71a98a 100644
--- a/target/arm/hvf/hvf.c
+++ b/target/arm/hvf/hvf.c
@@ -960,6 +960,20 @@ hv_return_t hvf_arch_vm_create(MachineState *ms, uint32_t pa_range)
     }
     chosen_ipa_bit_size = pa_range;
 
+#ifdef MAC_OS_VERSION_26_0
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_26_0
+    if (__builtin_available(macOS 26, *)) {
+        ret = hv_vm_config_set_ipa_granule(config, HV_IPA_GRANULE_4KB);
+        if (ret != HV_SUCCESS) {
+            error_report("HVF: failed to set 4KB IPA granule: %s",
+                         hvf_return_string(ret));
+            goto cleanup;
+        }
+        hvf_set_map_granule(4096);
+    }
+#endif
+#endif
+
     ret = hv_vm_create(config);
 
 cleanup:
-- 
2.52.0