diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 0911154bf8..d7281b93f3 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2923,6 +2923,18 @@ int kvm_convert_memory(hwaddr start, hwaddr size, bool to_private)
     section = memory_region_find(get_system_memory(), start, size);
     mr = section.mr;
     if (!mr) {
+        /*
+         * Ignore converting non-assigned region to shared.
+         *
+         * TDX requires vMMIO region to be shared to inject #VE to guest.
+         * OVMF issues conservatively MapGPA(shared) on 32bit PCI MMIO region,
+         * and vIO-APIC 0xFEC00000 4K page.
+         * OVMF assigns 32bit PCI MMIO region to
+         * [top of low memory: typically 2GB=0xC000000,  0xFC00000)
+         */
+        if (!to_private) {
+            return 0;
+        }
         return -1;
     }