Module Name: src
Committed By: bouyer
Date: Wed May 11 16:22:46 UTC 2022
Modified Files:
src/sys/arch/xen/x86: x86_xpmap.c
Log Message:
In bootstrap, after switching to a new page table make sure that
now-unused memory is unmapped.
To generate a diff of this commit:
cvs rdiff -u -r1.90 -r1.91 src/sys/arch/xen/x86/x86_xpmap.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/xen/x86/x86_xpmap.c
diff -u src/sys/arch/xen/x86/x86_xpmap.c:1.90 src/sys/arch/xen/x86/x86_xpmap.c:1.91
--- src/sys/arch/xen/x86/x86_xpmap.c:1.90 Sun Sep 6 02:18:53 2020
+++ src/sys/arch/xen/x86/x86_xpmap.c Wed May 11 16:22:46 2022
@@ -1,4 +1,4 @@
-/* $NetBSD: x86_xpmap.c,v 1.90 2020/09/06 02:18:53 riastradh Exp $ */
+/* $NetBSD: x86_xpmap.c,v 1.91 2022/05/11 16:22:46 bouyer Exp $ */
/*
* Copyright (c) 2017 The NetBSD Foundation, Inc.
@@ -95,7 +95,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: x86_xpmap.c,v 1.90 2020/09/06 02:18:53 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: x86_xpmap.c,v 1.91 2022/05/11 16:22:46 bouyer Exp $");
#include "opt_xen.h"
#include "opt_ddb.h"
@@ -911,7 +911,7 @@ xen_bootstrap_tables(vaddr_t old_pgd, va
/* Unpin old PGD */
xpq_queue_unpin_table(xpmap_ptom_masked(old_pgd - KERNBASE));
- /* Mark old tables RW */
+ /* Mark old tables RW if used, unmap otherwise */
page = old_pgd;
addr = xpmap_mtop((paddr_t)L2[pl2_pi(page)] & PTE_4KFRAME);
pte = (pd_entry_t *)((u_long)addr + KERNBASE);
@@ -925,6 +925,12 @@ xen_bootstrap_tables(vaddr_t old_pgd, va
*/
pte++;
}
+ while (page < old_pgd + (old_count * PAGE_SIZE)) {
+ addr = xpmap_ptom(((u_long)pte) - KERNBASE);
+ xpq_queue_pte_update(addr, 0);
+ page += PAGE_SIZE;
+ pte++;
+ }
xpq_flush_queue();
}
