diff --git a/README.md b/README.md
index a932bc72013ece..19e705a97d9d5d 100644
--- a/README.md
+++ b/README.md
@@ -3,5 +3,9 @@
 Contains patches for:
 
 * Support for virtio-watchdog
-* Boot time performance reporting for x86_64 and aarch64
+* Boot time performance reporting for x86_64
+
+The arm64 kernel does not write to Cloud Hypervisor's boot-timing MMIO register
+at `0x09000f00`: the address is unmapped on other hypervisors, including Apple's
+Virtualization.framework, where the write prevents booting on macOS 27.
 
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 32331e86c88ca1..cb68adcabe0789 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -82,7 +82,6 @@
 	 *  x21        primary_entry() .. start_kernel()        FDT pointer passed at boot in x0
 	 */
 SYM_CODE_START(primary_entry)
-	bl	trap_to_vmm
 	bl	record_mmu_state
 	bl	preserve_boot_args
 
@@ -164,21 +163,6 @@ CPU_BE( tbz	x19, #SCTLR_ELx_EE_SHIFT, 1f	)
 	ret
 SYM_CODE_END(record_mmu_state)
 
-/*
- * By writing to mmio region, trap to vmm to print timestamp,
- * but corrupt x7 and x8.
- * 0x9000f00 is debug region of pl011
- * 0x40 is the code specified in cloud hypervisor indicating the first debug
- * point of kernel.
- */
-SYM_CODE_START(trap_to_vmm)
-	movz	x7, 0x0900, lsl 16
-	add	x7, x7, 0xf00
-	mov	x8, 0x40
-	str	w8, [x7]
-	ret
-SYM_CODE_END(trap_to_vmm)
-
 /*
  * Preserve the arguments passed by the bootloader in x0 .. x3
  */