From ab259b19bd8105d779ec79a0cc00cf7f1feaf434 Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Wed, 9 Apr 2025 10:35:56 +0300
Subject: [PATCH] amd64: also limit printings of EFIRT page faults

PR:	285797

(cherry picked from commit 99332926f6fc6d1e4bb850a2b26744b948b14014)
---
 sys/amd64/amd64/trap.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/sys/amd64/amd64/trap.c b/sys/amd64/amd64/trap.c
index 692491ecfc5..1877aedee17 100644
--- a/sys/amd64/amd64/trap.c
+++ b/sys/amd64/amd64/trap.c
@@ -895,8 +895,13 @@ after_vmfault:
 	if (td->td_intr_nesting_level == 0 &&
 	    curpcb->pcb_onfault != NULL) {
 		if ((td->td_pflags2 & TDP2_EFIRT) != 0) {
-			trap_diag(frame, eva);
-			printf("EFI RT page fault\n");
+			u_long cnt = atomic_fetchadd_long(&cnt_efirt_faults, 1);
+
+			if ((print_efirt_faults == 1 && cnt == 1) ||
+			    print_efirt_faults == 2) {
+				trap_diag(frame, eva);
+				printf("EFI RT page fault\n");
+			}
 		}
 		frame->tf_rip = (long)curpcb->pcb_onfault;
 		return (0);