4:19 a.m.
Renaming, so it is better to reflect the flip layout of kernel VA, which
is introduced by kernel commit 14c127c957c1 ("arm64: mm: Flip kernel VA space")
Signed-off-by: Pingfan Liu <piliu(a)redhat.com>
Cc: HAGIO KAZUHITO <k-hagio-ab(a)nec.com>
Cc: Lianbo Jiang <lijiang(a)redhat.com>
Cc: Bhupesh Sharma <bhupesh.sharma(a)linaro.org>
Cc: Mark Salter <msalter(a)redhat.com>
Cc: Mark Langsdorf <mlangsdo(a)redhat.com>
Cc: Jeremy Linton <jlinton(a)redhat.com>
To: crash-utility(a)redhat.com
---
v1->v2: referrence to kernel version instead of commit id in notes
arm64.c | 8 ++++----
defs.h | 3 ++-
2 files changed, 6 insertions(+), 5 deletions(-)
diff --git a/arm64.c b/arm64.c
index 5e567ca..db36d98 100644
--- a/arm64.c
+++ b/arm64.c
@@ -221,9 +221,9 @@ arm64_init(int when)
arm64_calc_KERNELPACMASK();
ms = machdep->machspec;
if (ms->VA_BITS_ACTUAL) {
- ms->page_offset = ARM64_PAGE_OFFSET_ACTUAL;
- machdep->identity_map_base = ARM64_PAGE_OFFSET_ACTUAL;
- machdep->kvbase = ARM64_PAGE_OFFSET_ACTUAL;
+ ms->page_offset = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
+ machdep->identity_map_base = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
+ machdep->kvbase = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
ms->userspace_top = ARM64_USERSPACE_TOP_ACTUAL;
} else {
ms->page_offset = ARM64_PAGE_OFFSET;
@@ -404,7 +404,7 @@ arm64_init(int when)
fprintf(fp, "CONFIG_ARM64_VA_BITS: %ld\n", ms->CONFIG_ARM64_VA_BITS);
fprintf(fp, " VA_BITS_ACTUAL: %ld\n", ms->VA_BITS_ACTUAL);
fprintf(fp, "(calculated) VA_BITS: %ld\n", ms->VA_BITS);
- fprintf(fp, " PAGE_OFFSET: %lx\n", ARM64_PAGE_OFFSET_ACTUAL);
+ fprintf(fp, " PAGE_OFFSET: %lx\n", ARM64_FLIP_PAGE_OFFSET_ACTUAL);
fprintf(fp, " VA_START: %lx\n", ms->VA_START);
fprintf(fp, " modules: %lx - %lx\n", ms->modules_vaddr,
ms->modules_end);
fprintf(fp, " vmalloc: %lx - %lx\n", ms->vmalloc_start_addr,
ms->vmalloc_end);
diff --git a/defs.h b/defs.h
index 09d58e0..812f02f 100644
--- a/defs.h
+++ b/defs.h
@@ -3219,7 +3219,8 @@ typedef signed int s32;
#define ARM64_PAGE_OFFSET ((0xffffffffffffffffUL) \
<< (machdep->machspec->VA_BITS - 1))
-#define ARM64_PAGE_OFFSET_ACTUAL ((0xffffffffffffffffUL) \
+/* kernels > v5.4 the kernel VA space is flipped */
+#define ARM64_FLIP_PAGE_OFFSET_ACTUAL ((0xffffffffffffffffUL) \
- ((1UL) << machdep->machspec->VA_BITS_ACTUAL) + 1)
#define ARM64_USERSPACE_TOP ((1UL) << machdep->machspec->VA_BITS)
--
2.29.2
4:19 a.m.
New subject: [PATCHv2 2/2] crash-utility/arm64: assign page_offset with kernel configure value
On RHEL9, crash hits a bug when executing "crash /proc/kcore" :
seek error: kernel virtual address: ffff6a0f3fff0000 type: "pmd page"
The kernel virtual address does not vary with va_actual bits, instead,
is determined by configuration value. But crash does not observe this
fact.
Since this disagreement only happens if 52-bits kernel on 48 bits platform,
it can be handled only if "memstart_addr < 0".
Signed-off-by: Pingfan Liu <piliu(a)redhat.com>
Cc: HAGIO KAZUHITO <k-hagio-ab(a)nec.com>
Cc: Lianbo Jiang <lijiang(a)redhat.com>
Cc: Bhupesh Sharma <bhupesh.sharma(a)linaro.org>
Cc: Mark Salter <msalter(a)redhat.com>
Cc: Mark Langsdorf <mlangsdo(a)redhat.com>
Cc: Jeremy Linton <jlinton(a)redhat.com>
To: crash-utility(a)redhat.com
---
v1->v2: no change
arm64.c | 10 +++++++++-
defs.h | 1 +
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/arm64.c b/arm64.c
index db36d98..28d9373 100644
--- a/arm64.c
+++ b/arm64.c
@@ -220,7 +220,15 @@ arm64_init(int when)
arm64_calc_VA_BITS();
arm64_calc_KERNELPACMASK();
ms = machdep->machspec;
- if (ms->VA_BITS_ACTUAL) {
+ /* For 52-bits kernel running on 48 bits platform */
+ if (ms->memstart_addr < 0) {
+ ms->page_offset = ARM64_FLIP_PAGE_OFFSET;
+ /* useless on arm64 */
+ machdep->identity_map_base = ARM64_FLIP_PAGE_OFFSET;
+ machdep->kvbase = ARM64_FLIP_PAGE_OFFSET;
+ ms->userspace_top = ARM64_USERSPACE_TOP_ACTUAL;
+ /* For 52-bits on 52-bits platform, or 48-bits on 48 */
+ } else if (ms->VA_BITS_ACTUAL) {
ms->page_offset = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
machdep->identity_map_base = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
machdep->kvbase = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
diff --git a/defs.h b/defs.h
index 812f02f..27e15c9 100644
--- a/defs.h
+++ b/defs.h
@@ -3220,6 +3220,7 @@ typedef signed int s32;
#define ARM64_PAGE_OFFSET ((0xffffffffffffffffUL) \
<< (machdep->machspec->VA_BITS - 1))
/* kernels > v5.4 the kernel VA space is flipped */
+#define ARM64_FLIP_PAGE_OFFSET (-(1UL) <<
machdep->machspec->CONFIG_ARM64_VA_BITS)
#define ARM64_FLIP_PAGE_OFFSET_ACTUAL ((0xffffffffffffffffUL) \
- ((1UL) << machdep->machspec->VA_BITS_ACTUAL) + 1)
--
2.29.2
4:48 a.m.
New subject: [PATCHv2 2/2] crash-utility/arm64: assign page_offset with kernel configure value
On 4/7/21 5:19 PM, Pingfan Liu wrote:
On RHEL9, crash hits a bug when executing "crash
/proc/kcore" :
seek error: kernel virtual address: ffff6a0f3fff0000 type: "pmd page"
The kernel virtual address does not vary with va_actual bits, instead,
is determined by configuration value. But crash does not observe this
fact.
Since this disagreement only happens if 52-bits kernel on 48 bits platform,
it can be handled only if "memstart_addr < 0".
Signed-off-by: Pingfan Liu <piliu(a)redhat.com>
Cc: HAGIO KAZUHITO <k-hagio-ab(a)nec.com>
Cc: Lianbo Jiang <lijiang(a)redhat.com>
Cc: Bhupesh Sharma <bhupesh.sharma(a)linaro.org>
Cc: Mark Salter <msalter(a)redhat.com>
Cc: Mark Langsdorf <mlangsdo(a)redhat.com>
Cc: Jeremy Linton <jlinton(a)redhat.com>
To: crash-utility(a)redhat.com
---
v1->v2: no change
arm64.c | 10 +++++++++-
defs.h | 1 +
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/arm64.c b/arm64.c
index db36d98..28d9373 100644
--- a/arm64.c
+++ b/arm64.c
@@ -220,7 +220,15 @@ arm64_init(int when)
arm64_calc_VA_BITS();
arm64_calc_KERNELPACMASK();
ms = machdep->machspec;
- if (ms->VA_BITS_ACTUAL) {
+ /* For 52-bits kernel running on 48 bits platform */
+ if (ms->memstart_addr < 0) {
Here is a mistake.
Based on "crash-utility/arm64: store phy_offset and memstart_addr
separately", it should be "ms->phys_offset_nominal"
For rest, any ideas?
Thanks,
Pingfan
+ ms->page_offset = ARM64_FLIP_PAGE_OFFSET;
+ /* useless on arm64 */
+ machdep->identity_map_base = ARM64_FLIP_PAGE_OFFSET;
+ machdep->kvbase = ARM64_FLIP_PAGE_OFFSET;
+ ms->userspace_top = ARM64_USERSPACE_TOP_ACTUAL;
+ /* For 52-bits on 52-bits platform, or 48-bits on 48 */
+ } else if (ms->VA_BITS_ACTUAL) {
ms->page_offset = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
machdep->identity_map_base = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
machdep->kvbase = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
diff --git a/defs.h b/defs.h
index 812f02f..27e15c9 100644
--- a/defs.h
+++ b/defs.h
@@ -3220,6 +3220,7 @@ typedef signed int s32;
#define ARM64_PAGE_OFFSET ((0xffffffffffffffffUL) \
<< (machdep->machspec->VA_BITS - 1))
/* kernels > v5.4 the kernel VA space is flipped */
+#define ARM64_FLIP_PAGE_OFFSET (-(1UL) <<
machdep->machspec->CONFIG_ARM64_VA_BITS)
#define ARM64_FLIP_PAGE_OFFSET_ACTUAL ((0xffffffffffffffffUL) \
- ((1UL) << machdep->machspec->VA_BITS_ACTUAL) + 1)
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