diff --git a/guest/pvmfw/src/main.rs b/guest/pvmfw/src/main.rs
index 9afbcc3..30624cd 100644
--- a/guest/pvmfw/src/main.rs
+++ b/guest/pvmfw/src/main.rs
@@ -41,7 +41,6 @@
 use alloc::boxed::Box;
 use bssl_avf::Digester;
 use diced_open_dice::{bcc_handover_parse, DiceArtifacts, DiceContext, Hidden, VM_KEY_ALGORITHM};
-use hypervisor_backends::get_mem_sharer;
 use libfdt::Fdt;
 use log::{debug, error, info, trace, warn};
 use pvmfw_avb::verify_payload;
@@ -99,15 +98,7 @@
     }
 
     let guest_page_size = verified_boot_data.page_size.unwrap_or(SIZE_4KB);
-    // TODO(ptosi): Cache the (single?) granule once, in vmbase.
-    let hyp_page_size = if let Some(mem_sharer) = get_mem_sharer() {
-        Some(mem_sharer.granule().map_err(|e| {
-            error!("Failed to get granule size: {e}");
-            RebootReason::InternalError
-        })?)
-    } else {
-        None
-    };
+    let hyp_page_size = hypervisor_backends::get_granule_size();
     let _ =
         sanitize_device_tree(untrusted_fdt, vm_dtbo, vm_ref_dt, guest_page_size, hyp_page_size)?;
     let fdt = untrusted_fdt; // DT has now been sanitized.
diff --git a/libs/libhypervisor_backends/src/hypervisor.rs b/libs/libhypervisor_backends/src/hypervisor.rs
index aa65133..7c274f5 100644
--- a/libs/libhypervisor_backends/src/hypervisor.rs
+++ b/libs/libhypervisor_backends/src/hypervisor.rs
@@ -152,3 +152,8 @@
 pub fn get_device_assigner() -> Option<&'static dyn DeviceAssigningHypervisor> {
     get_hypervisor().as_device_assigner()
 }
+
+/// Gets the unique hypervisor granule size, if any.
+pub fn get_granule_size() -> Option<usize> {
+    get_hypervisor().get_granule_size()
+}
diff --git a/libs/libhypervisor_backends/src/hypervisor/common.rs b/libs/libhypervisor_backends/src/hypervisor/common.rs
index bfe638f..f229e14 100644
--- a/libs/libhypervisor_backends/src/hypervisor/common.rs
+++ b/libs/libhypervisor_backends/src/hypervisor/common.rs
@@ -32,6 +32,13 @@
     fn as_device_assigner(&self) -> Option<&dyn DeviceAssigningHypervisor> {
         None
     }
+
+    /// Returns the granule used by all APIs (MEM_SHARE, MMIO_GUARD, device assignment, ...).
+    ///
+    /// If no such API is supported or if they support different granule sizes, returns None.
+    fn get_granule_size(&self) -> Option<usize> {
+        None
+    }
 }
 
 pub trait MmioGuardedHypervisor {
diff --git a/libs/libhypervisor_backends/src/hypervisor/geniezone.rs b/libs/libhypervisor_backends/src/hypervisor/geniezone.rs
index 76e010b..0913ff3 100644
--- a/libs/libhypervisor_backends/src/hypervisor/geniezone.rs
+++ b/libs/libhypervisor_backends/src/hypervisor/geniezone.rs
@@ -84,6 +84,10 @@
     fn as_mem_sharer(&self) -> Option<&dyn MemSharingHypervisor> {
         Some(self)
     }
+
+    fn get_granule_size(&self) -> Option<usize> {
+        <Self as MemSharingHypervisor>::granule(self).ok()
+    }
 }
 
 impl MmioGuardedHypervisor for GeniezoneHypervisor {
diff --git a/libs/libhypervisor_backends/src/hypervisor/kvm_aarch64.rs b/libs/libhypervisor_backends/src/hypervisor/kvm_aarch64.rs
index 233097b..f183107 100644
--- a/libs/libhypervisor_backends/src/hypervisor/kvm_aarch64.rs
+++ b/libs/libhypervisor_backends/src/hypervisor/kvm_aarch64.rs
@@ -90,6 +90,10 @@
     fn as_device_assigner(&self) -> Option<&dyn DeviceAssigningHypervisor> {
         Some(self)
     }
+
+    fn get_granule_size(&self) -> Option<usize> {
+        <Self as MemSharingHypervisor>::granule(self).ok()
+    }
 }
 
 impl MmioGuardedHypervisor for ProtectedKvmHypervisor {
diff --git a/libs/libhypervisor_backends/src/hypervisor/kvm_x86.rs b/libs/libhypervisor_backends/src/hypervisor/kvm_x86.rs
index 7f9ea4d..d72f788 100644
--- a/libs/libhypervisor_backends/src/hypervisor/kvm_x86.rs
+++ b/libs/libhypervisor_backends/src/hypervisor/kvm_x86.rs
@@ -84,6 +84,10 @@
     fn as_mem_sharer(&self) -> Option<&dyn MemSharingHypervisor> {
         Some(self)
     }
+
+    fn get_granule_size(&self) -> Option<usize> {
+        <Self as MemSharingHypervisor>::granule(self).ok()
+    }
 }
 
 macro_rules! vmcall {
diff --git a/libs/libhypervisor_backends/src/lib.rs b/libs/libhypervisor_backends/src/lib.rs
index 33dc5ad..3c81ac8 100644
--- a/libs/libhypervisor_backends/src/lib.rs
+++ b/libs/libhypervisor_backends/src/lib.rs
@@ -24,5 +24,6 @@
 
 pub use error::{Error, Result};
 pub use hypervisor::{
-    get_device_assigner, get_mem_sharer, get_mmio_guard, DeviceAssigningHypervisor, KvmError,
+    get_device_assigner, get_granule_size, get_mem_sharer, get_mmio_guard,
+    DeviceAssigningHypervisor, KvmError,
 };