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authorXunlei Pang <xlpang@redhat.com>2016-05-23 16:24:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-23 17:04:14 -0700
commit7a0058ec78602da02b34fa2ae3afc523e90d1ab2 (patch)
tree46268819bc7000ca50afd55941d2e130016e6fd9 /arch
parent0eea08678ebe9f7d8ef98fed974a5bf1a0dd2dd2 (diff)
s390/kexec: consolidate crash_map/unmap_reserved_pages() and arch_kexec_protect(unprotect)_crashkres()
Commit 3f625002581b ("kexec: introduce a protection mechanism for the crashkernel reserved memory") is a similar mechanism for protecting the crash kernel reserved memory to previous crash_map/unmap_reserved_pages() implementation, the new one is more generic in name and cleaner in code (besides, some arch may not be allowed to unmap the pgtable). Therefore, this patch consolidates them, and uses the new arch_kexec_protect(unprotect)_crashkres() to replace former crash_map/unmap_reserved_pages() which by now has been only used by S390. The consolidation work needs the crash memory to be mapped initially, this is done in machine_kdump_pm_init() which is after reserve_crashkernel(). Once kdump kernel is loaded, the new arch_kexec_protect_crashkres() implemented for S390 will actually unmap the pgtable like before. Signed-off-by: Xunlei Pang <xlpang@redhat.com> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Acked-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Minfei Huang <mhuang@redhat.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Dave Young <dyoung@redhat.com> Cc: Baoquan He <bhe@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/kernel/machine_kexec.c28
1 files changed, 18 insertions, 10 deletions
diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c
index 2f1b7217c25c..0e64f08d3d69 100644
--- a/arch/s390/kernel/machine_kexec.c
+++ b/arch/s390/kernel/machine_kexec.c
@@ -43,13 +43,13 @@ static int machine_kdump_pm_cb(struct notifier_block *nb, unsigned long action,
switch (action) {
case PM_SUSPEND_PREPARE:
case PM_HIBERNATION_PREPARE:
- if (crashk_res.start)
- crash_map_reserved_pages();
+ if (kexec_crash_image)
+ arch_kexec_unprotect_crashkres();
break;
case PM_POST_SUSPEND:
case PM_POST_HIBERNATION:
- if (crashk_res.start)
- crash_unmap_reserved_pages();
+ if (kexec_crash_image)
+ arch_kexec_protect_crashkres();
break;
default:
return NOTIFY_DONE;
@@ -60,6 +60,8 @@ static int machine_kdump_pm_cb(struct notifier_block *nb, unsigned long action,
static int __init machine_kdump_pm_init(void)
{
pm_notifier(machine_kdump_pm_cb, 0);
+ /* Create initial mapping for crashkernel memory */
+ arch_kexec_unprotect_crashkres();
return 0;
}
arch_initcall(machine_kdump_pm_init);
@@ -146,6 +148,8 @@ static int kdump_csum_valid(struct kimage *image)
#endif
}
+#ifdef CONFIG_CRASH_DUMP
+
/*
* Map or unmap crashkernel memory
*/
@@ -167,21 +171,25 @@ static void crash_map_pages(int enable)
}
/*
- * Map crashkernel memory
+ * Unmap crashkernel memory
*/
-void crash_map_reserved_pages(void)
+void arch_kexec_protect_crashkres(void)
{
- crash_map_pages(1);
+ if (crashk_res.end)
+ crash_map_pages(0);
}
/*
- * Unmap crashkernel memory
+ * Map crashkernel memory
*/
-void crash_unmap_reserved_pages(void)
+void arch_kexec_unprotect_crashkres(void)
{
- crash_map_pages(0);
+ if (crashk_res.end)
+ crash_map_pages(1);
}
+#endif
+
/*
* Give back memory to hypervisor before new kdump is loaded
*/