From 7af49852457d4eaf820d8f17b305ea445248c68a Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Sun, 30 Dec 2018 15:58:18 +0000
Subject: Add 'v' modifier to the ddb 'show pginfo' command to display vm_page
 backing the provided kernel virtual address.

Tested by:	pho
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
---
 sys/vm/vm_page.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'sys/vm')

diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index f5115a578c71..94e65c90c8f9 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -4493,7 +4493,7 @@ DB_SHOW_COMMAND(pageq, vm_page_print_pageq_info)
 DB_SHOW_COMMAND(pginfo, vm_page_print_pginfo)
 {
 	vm_page_t m;
-	boolean_t phys;
+	boolean_t phys, virt;
 
 	if (!have_addr) {
 		db_printf("show pginfo addr\n");
@@ -4501,7 +4501,10 @@ DB_SHOW_COMMAND(pginfo, vm_page_print_pginfo)
 	}
 
 	phys = strchr(modif, 'p') != NULL;
-	if (phys)
+	virt = strchr(modif, 'v') != NULL;
+	if (virt)
+		m = PHYS_TO_VM_PAGE(pmap_kextract(addr));
+	else if (phys)
 		m = PHYS_TO_VM_PAGE(addr);
 	else
 		m = (vm_page_t)addr;
-- 
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