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authorHeiko Carstens <heiko.carstens@de.ibm.com>2016-05-31 09:14:00 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-06-13 15:58:19 +0200
commit4e042af463f806b6ef0e44048eba0964f0a5694e (patch)
tree4bd3cfb12176ee1697ee2c376164eaf28b8d23bf
parent2d0af2247906cf17cd641cdb16444a8f291cd4f4 (diff)
s390/kexec: fix crash on resize of reserved memory
Reducing the size of reserved memory for the crash kernel will result in an immediate crash on s390. Reason for that is that we do not create struct pages for memory that is reserved. If that memory is freed any access to struct pages which correspond to this memory will result in invalid memory accesses and a kernel panic. Fix this by properly creating struct pages when the system gets initialized. Change the code also to make use of set_memory_ro() and set_memory_rw() so page tables will be split if required. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/kernel/machine_kexec.c33
-rw-r--r--arch/s390/kernel/setup.c15
2 files changed, 25 insertions, 23 deletions
diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c
index 078d38c05490..3074c1d83829 100644
--- a/arch/s390/kernel/machine_kexec.c
+++ b/arch/s390/kernel/machine_kexec.c
@@ -24,6 +24,7 @@
#include <asm/diag.h>
#include <asm/elf.h>
#include <asm/asm-offsets.h>
+#include <asm/cacheflush.h>
#include <asm/os_info.h>
#include <asm/switch_to.h>
@@ -60,8 +61,6 @@ 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);
@@ -163,37 +162,27 @@ void crash_free_reserved_phys_range(unsigned long begin, unsigned long end)
os_info_crashkernel_add(0, 0);
}
-/*
- * Map or unmap crashkernel memory
- */
-static void crash_map_pages(int enable)
+static void crash_protect_pages(int protect)
{
- unsigned long size = resource_size(&crashk_res);
+ unsigned long size;
- BUG_ON(crashk_res.start % KEXEC_CRASH_MEM_ALIGN ||
- size % KEXEC_CRASH_MEM_ALIGN);
- if (enable)
- vmem_add_mapping(crashk_res.start, size);
+ if (!crashk_res.end)
+ return;
+ size = resource_size(&crashk_res);
+ if (protect)
+ set_memory_ro(crashk_res.start, size >> PAGE_SHIFT);
else
- vmem_remove_mapping(crashk_res.start, size);
+ set_memory_rw(crashk_res.start, size >> PAGE_SHIFT);
}
-/*
- * Unmap crashkernel memory
- */
void arch_kexec_protect_crashkres(void)
{
- if (crashk_res.end)
- crash_map_pages(0);
+ crash_protect_pages(1);
}
-/*
- * Map crashkernel memory
- */
void arch_kexec_unprotect_crashkres(void)
{
- if (crashk_res.end)
- crash_map_pages(1);
+ crash_protect_pages(0);
}
#endif
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index d4e0742b197b..9b4bb9d9275f 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -432,6 +432,20 @@ static void __init setup_resources(void)
}
}
}
+#ifdef CONFIG_CRASH_DUMP
+ /*
+ * Re-add removed crash kernel memory as reserved memory. This makes
+ * sure it will be mapped with the identity mapping and struct pages
+ * will be created, so it can be resized later on.
+ * However add it later since the crash kernel resource should not be
+ * part of the System RAM resource.
+ */
+ if (crashk_res.end) {
+ memblock_add(crashk_res.start, resource_size(&crashk_res));
+ memblock_reserve(crashk_res.start, resource_size(&crashk_res));
+ insert_resource(&iomem_resource, &crashk_res);
+ }
+#endif
}
static void __init setup_memory_end(void)
@@ -602,7 +616,6 @@ static void __init reserve_crashkernel(void)
diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
- insert_resource(&iomem_resource, &crashk_res);
memblock_remove(crash_base, crash_size);
pr_info("Reserving %lluMB of memory at %lluMB "
"for crashkernel (System RAM: %luMB)\n",