diff --git a/arm64.c b/arm64.c
index 08b7db2..5e14daa 100644
--- a/arm64.c
+++ b/arm64.c
@@ -4891,6 +4891,17 @@ arm64_set_va_bits_by_tcr(void)
* vabits_actual = 64 - T1SZ;
*/
value = 64 - value;
+ /*
+ * vabits
+ * |
+ * |--------|--------|
+ * 64 32 1
+ */
+ if (value < 32) {
+ error(WARNING, "parse vabits_actual(%ld) invalid, maybe dec number.\n", value);
+ // DEC >> HEX
+ value = (value/10) * 16 + (value%10);
+ }
if (CRASHDEBUG(1))
fprintf(fp, "vmcoreinfo : vabits_actual: %ld\n", value);
machdep->machspec->VA_BITS_ACTUAL = value;
发件人: qiwu.chen(陈启武) <qiwu.chen@xxxxxxxxxxxxx>
发送时间: 2024年7月15日 15:45:22
收件人: 陈冠有; devel@xxxxxxxxxxxxxxxxxxxxxxxxxxx
主题: 答复: [External Mail] [PATCH] arm64: fix regression for the determination of VA_BITS and section_size_bits
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Hi
guanyou
是的，crash工具加载MTK平台K419版本vmcore出现的问题。
看起来MTK在lk阶段向vmcoreinfo写入"NUMBER(TCR_EL1_T1SZ)=25\n"导致的，而不是从在kernel通过读取tcr_el1获取TCR_EL1_T1SZ的值
Thanks
发件人:
陈冠有 <chenguanyou@xxxxxxxxxx>
发送时间: 2024年7月15日 13:58
收件人: qiwu.chen(陈启武) <qiwu.chen@xxxxxxxxxxxxx>; devel@xxxxxxxxxxxxxxxxxxxxxxxxxxx
主题: 答复: [External Mail] [PATCH] arm64: fix regression for the determination of VA_BITS and section_size_bits
[外部邮件]
此邮件来源于小米公司外部，请谨慎处理。若对邮件安全性存疑，请将邮件转发给misec@xxxxxxxxxx进行反馈
1. The commit f02c8e87 will cause a regression issue for the determination of VA_BITS
on Linux 4.19 and earlier kernels, the crash session fails during initialization with
the error message due to get a wrong vabits_actual:
vmcoreinfo : vabits_actual: 27
crash: invalid kernel virtual address: ffffffa890a41318 type: "kernel_config_data"
WARNING: cannot read kernel_config_data
crash: invalid kernel virtual address: ffffffa89106db50 type: "possible"
WARNING: cannot read cpu_possible_map
crash: invalid kernel virtual address: ffffffa89106db48 type: "present"
WARNING: cannot read cpu_present_map
crash: invalid kernel virtual address: ffffffa89106db40 type: "online"
WARNING: cannot read cpu_online_map
crash: invalid kernel virtual address: ffffffa89106db58 type: "active"
WARNING: cannot read cpu_active_map
crash: invalid kernel virtual address: ffffffa89143cb80 type: "shadow_timekeeper xtime_sec"
crash: invalid kernel virtual address: ffffffa89107b76c type: "init_uts_ns"
WARNING: invalid linux_banner pointer: ffffffa890a30018
crash: vmlinux and SYS_COREDUMP do not match!
Fix it by remove arm64_set_va_bits_by_tcr() if vabits_actual is missing.
2. The commit 568c6f04 will cause a regression issue for the determination of section_size_bits
on Linux 5.12 and earlier kernels. The section_size_bits compatible with linux upstream and
android GKI changes should be:
Before android-12-GKI or Linux 5.12:
SECTION_SIZE_BITS = 30
After android-12-gki:
SECTION_SIZE_BITS = 27 when defined 4K_PAGES or 16K_PAGES.
SECTION_SIZE_BITS = 29 when defined 64K_PAGES.
Fixes: f02c8e87 ("arm64: use TCR_EL1_T1SZ to get the correct info if vabits_actual is missing")
Fixes: 568c6f04 ("arm64: section_size_bits compatible with macro definitions")
Signed-off-by: qiwu.chen <qiwu.chen@xxxxxxxxxxxxx>
---
arm64.c | 37 ++++++++++++++++++-------------------
1 file changed, 18 insertions(+), 19 deletions(-)
diff --git a/arm64.c b/arm64.c
index b3040d7..176c465 100644
--- a/arm64.c
+++ b/arm64.c
@@ -1613,8 +1613,15 @@ arm64_get_section_size_bits(void)
{
int ret;
char *string;
+ bool is_ikconfig_avail;
- if (THIS_KERNEL_VERSION >= LINUX(5,12,0)) {
+ if (arm64_get_vmcoreinfo(&machdep->section_size_bits, "NUMBER(SECTION_SIZE_BITS)", NUM_DEC))
+ goto exit;
+
+ is_ikconfig_avail = kt->ikconfig_flags & IKCONFIG_AVAIL ? TRUE : FALSE;
+ /* The commit reduce section size for arm64 sparsemem is introduced on linux-v5.12 and android-12-GKI */
+ if (THIS_KERNEL_VERSION >= LINUX(5,12,0) || (is_ikconfig_avail &&
+ get_kernel_config("CONFIG_ANDROID_KABI_RESERVE", NULL) == IKCONFIG_Y)) {
if (machdep->pagesize == 65536)
machdep->section_size_bits = _SECTION_SIZE_BITS_5_12_64K;
else
@@ -1622,24 +1629,18 @@ arm64_get_section_size_bits(void)
} else
machdep->section_size_bits = _SECTION_SIZE_BITS;
- if (arm64_get_vmcoreinfo(&machdep->section_size_bits, "NUMBER(SECTION_SIZE_BITS)", NUM_DEC)) {
- /* nothing */
- } else if (kt->ikconfig_flags & IKCONFIG_AVAIL) {
- if ((ret = get_kernel_config("CONFIG_MEMORY_HOTPLUG", NULL)) == IKCONFIG_Y) {
- if ((ret = get_kernel_config("CONFIG_HOTPLUG_SIZE_BITS", &string)) == IKCONFIG_STR)
- machdep->section_size_bits = atol(string);
- }
-
- /* arm64: reduce section size for sparsemem */
- if ((ret = get_kernel_config("CONFIG_ARM64_4K_PAGES", NULL)) == IKCONFIG_Y
- || (ret = get_kernel_config("CONFIG_ARM64_16K_PAGES", NULL)) == IKCONFIG_Y)
- machdep->section_size_bits = _SECTION_SIZE_BITS_5_12;
- else if ((ret = get_kernel_config("CONFIG_ARM64_64K_PAGES", NULL)) == IKCONFIG_Y)
- machdep->section_size_bits = _SECTION_SIZE_BITS_5_12_64K;
+ /* section_size_bits for arm64 vendor special case */
+ if (is_ikconfig_avail && get_kernel_config("CONFIG_MEMORY_HOTPLUG", NULL) == IKCONFIG_Y) {
+ if (get_kernel_config("CONFIG_HOTPLUG_SIZE_BITS", &string) == IKCONFIG_STR)
+ machdep->section_size_bits = atol(string);
}
- if (CRASHDEBUG(1))
- fprintf(fp, "SECTION_SIZE_BITS: %ld\n", machdep->section_size_bits);
+exit:
+ if (machdep->section_size_bits) {
+ if (CRASHDEBUG(1))
+ fprintf(fp, "SECTION_SIZE_BITS: %ld\n", machdep->section_size_bits);
+ } else
+ error(FATAL, "cannot determine SECTION_SIZE_BITS\n");
}
/*
@@ -4733,8 +4734,6 @@ arm64_calc_VA_BITS(void)
*/
machdep->flags |= FLIPPED_VM;
return;
- } else if (arm64_set_va_bits_by_tcr()) {
- return;
} else if (machdep->machspec->VA_BITS_ACTUAL) {
machdep->machspec->VA_BITS = machdep->machspec->VA_BITS_ACTUAL;
machdep->machspec->VA_START = _VA_START(machdep->machspec->VA_BITS_ACTUAL);
--
2.25.1
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