diff --git a/sys/amd64/acpica/acpi_wakeup.c b/sys/amd64/acpica/acpi_wakeup.c
--- a/sys/amd64/acpica/acpi_wakeup.c
+++ b/sys/amd64/acpica/acpi_wakeup.c
@@ -289,24 +289,26 @@
 			resume_cpus(suspcpus);
 #endif
 
+		identify_cpu_ext_features();
+
+		mca_resume();
+		if (vmm_resume_p != NULL)
+			vmm_resume_p();
+		intr_resume(/*suspend_cancelled*/false);
+
 		/*
 		 * Re-read cpu_stdext_feature3, which was zeroed-out
 		 * in acpi_sleep_machdep(), after the microcode was
 		 * reloaded.  Then recalculate the active mitigation
 		 * knobs that depend on the microcode and
-		 * cpu_stdext_feature3.
+		 * cpu_stdext_feature3.  Do it after LAPICs are woken,
+		 * so that IPIs work.
 		 */
-		identify_cpu_ext_features();
 		hw_ibrs_recalculate(true);
-		hw_ssb_recalculate(true);
 		amd64_syscall_ret_flush_l1d_recalc();
+		hw_ssb_recalculate(true);
 		x86_rngds_mitg_recalculate(true);
 
-		mca_resume();
-		if (vmm_resume_p != NULL)
-			vmm_resume_p();
-		intr_resume(/*suspend_cancelled*/false);
-
 		AcpiSetFirmwareWakingVector(0, 0);
 	} else {
 		/* Wakeup MD procedures in interrupt enabled context */