s390: add kfence region to pagetable dumper

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Link: https://lore.kernel.org/r/20210728190254.3921642-5-hca@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c
index e40a30647d99d5c68304f09c72488c4e53f785e2..0b0c8c2849530c4f0294068c8325c57db77f9dba 100644 (file)
--- a/arch/s390/mm/dump_pagetables.c
+++ b/arch/s390/mm/dump_pagetables.c
@@ -4,6 +4,7 @@
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
 #include <linux/mm.h>
+#include <linux/kfence.h>
 #include <linux/kasan.h>
 #include <asm/ptdump.h>
 #include <asm/kasan.h>
@@ -21,6 +22,10 @@ enum address_markers_idx {
        IDENTITY_BEFORE_END_NR,
        KERNEL_START_NR,
        KERNEL_END_NR,
+#ifdef CONFIG_KFENCE
+       KFENCE_START_NR,
+       KFENCE_END_NR,
+#endif
        IDENTITY_AFTER_NR,
        IDENTITY_AFTER_END_NR,
 #ifdef CONFIG_KASAN
@@ -40,6 +45,10 @@ static struct addr_marker address_markers[] = {
        [IDENTITY_BEFORE_END_NR] = {(unsigned long)_stext, "Identity Mapping End"},
        [KERNEL_START_NR]       = {(unsigned long)_stext, "Kernel Image Start"},
        [KERNEL_END_NR]         = {(unsigned long)_end, "Kernel Image End"},
+#ifdef CONFIG_KFENCE
+       [KFENCE_START_NR]       = {0, "KFence Pool Start"},
+       [KFENCE_END_NR]         = {0, "KFence Pool End"},
+#endif
        [IDENTITY_AFTER_NR]     = {(unsigned long)_end, "Identity Mapping Start"},
        [IDENTITY_AFTER_END_NR] = {0, "Identity Mapping End"},
 #ifdef CONFIG_KASAN
@@ -248,6 +257,9 @@ static void sort_address_markers(void)
 
 static int pt_dump_init(void)
 {
+#ifdef CONFIG_KFENCE
+       unsigned long kfence_start = (unsigned long)__kfence_pool;
+#endif
        /*
         * Figure out the maximum virtual address being accessible with the
         * kernel ASCE. We need this to keep the page table walker functions
@@ -262,6 +274,10 @@ static int pt_dump_init(void)
        address_markers[VMEMMAP_END_NR].start_address = (unsigned long)vmemmap + vmemmap_size;
        address_markers[VMALLOC_NR].start_address = VMALLOC_START;
        address_markers[VMALLOC_END_NR].start_address = VMALLOC_END;
+#ifdef CONFIG_KFENCE
+       address_markers[KFENCE_START_NR].start_address = kfence_start;
+       address_markers[KFENCE_END_NR].start_address = kfence_start + KFENCE_POOL_SIZE;
+#endif
        sort_address_markers();
 #ifdef CONFIG_PTDUMP_DEBUGFS
        debugfs_create_file("kernel_page_tables", 0400, NULL, NULL, &ptdump_fops);