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s390/boot: Add vmem debugging support

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Introduce boot_debug() calls in vmem code to log page table mappings
including KASAN shadow mappings for improved early boot debugging.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2024-12-11 12:11:04 +01:00 committed by Alexander Gordeev
parent a56827e5a5
commit 418b4d5e61
1 changed files with 44 additions and 3 deletions
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47
arch/s390/boot/vmem.c
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@ -1,4 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
#define boot_fmt(fmt) "vmem: " fmt
#include <linux/sched/task.h>
#include <linux/pgtable.h>
#include <linux/kasan.h>
@ -32,12 +33,42 @@ enum populate_mode {
POPULATE_IDENTITY,
POPULATE_KERNEL,
#ifdef CONFIG_KASAN
/* KASAN modes should be last and grouped together, see is_kasan_populate_mode() */
POPULATE_KASAN_MAP_SHADOW,
POPULATE_KASAN_ZERO_SHADOW,
POPULATE_KASAN_SHALLOW
#endif
};
#define POPULATE_MODE_NAME(t) case POPULATE_ ## t: return #t
static inline const char *get_populate_mode_name(enum populate_mode t)
{
switch (t) {
POPULATE_MODE_NAME(NONE);
POPULATE_MODE_NAME(DIRECT);
POPULATE_MODE_NAME(LOWCORE);
POPULATE_MODE_NAME(ABS_LOWCORE);
POPULATE_MODE_NAME(IDENTITY);
POPULATE_MODE_NAME(KERNEL);
#ifdef CONFIG_KASAN
POPULATE_MODE_NAME(KASAN_MAP_SHADOW);
POPULATE_MODE_NAME(KASAN_ZERO_SHADOW);
POPULATE_MODE_NAME(KASAN_SHALLOW);
#endif
default:
return "UNKNOWN";
}
}
static bool is_kasan_populate_mode(enum populate_mode mode)
{
#ifdef CONFIG_KASAN
return mode >= POPULATE_KASAN_MAP_SHADOW;
#else
return false;
#endif
}
static void pgtable_populate(unsigned long addr, unsigned long end, enum populate_mode mode);
#ifdef CONFIG_KASAN
@ -53,9 +84,12 @@ static pte_t pte_z;
static inline void kasan_populate(unsigned long start, unsigned long end, enum populate_mode mode)
{
start = PAGE_ALIGN_DOWN(__sha(start));
end = PAGE_ALIGN(__sha(end));
pgtable_populate(start, end, mode);
unsigned long sha_start = PAGE_ALIGN_DOWN(__sha(start));
unsigned long sha_end = PAGE_ALIGN(__sha(end));
boot_debug("%-17s 0x%016lx-0x%016lx >> 0x%016lx-0x%016lx\n", get_populate_mode_name(mode),
start, end, sha_start, sha_end);
pgtable_populate(sha_start, sha_end, mode);
}
static void kasan_populate_shadow(unsigned long kernel_start, unsigned long kernel_end)
@ -418,6 +452,13 @@ static void pgtable_populate(unsigned long addr, unsigned long end, enum populat
pgd_t *pgd;
p4d_t *p4d;
if (!is_kasan_populate_mode(mode)) {
boot_debug("%-17s 0x%016lx-0x%016lx -> 0x%016lx-0x%016lx\n",
get_populate_mode_name(mode), addr, end,
resolve_pa_may_alloc(addr, 0, mode),
resolve_pa_may_alloc(end - 1, 0, mode) + 1);
}
pgd = pgd_offset(&init_mm, addr);
for (; addr < end; addr = next, pgd++) {
next = pgd_addr_end(addr, end);