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zdump: Use os_info data to convert dump vaddr to paddr

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For vr-kernel dumps use the offsets stored in os_info entries for
virt to phys address conversion when dump virtual address is to be
read, (e.g. vmcoreinfo symbols) using similar method as implemented
in crash-utility.
It is mainly required for reading "init_uts_ns" symbol and, in case
of crashed kdump, "lowcore_ptr" symbol along with a pointers to the
lowcore of every CPU.

Acked-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
This commit is contained in:
Mikhail Zaslonko
2024-04-17 14:43:43 +02:00
committed by Steffen Eiden
parent 858da9af57
commit 6d15850480
4 changed files with 64 additions and 2 deletions
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zdump/dfi.c
+5 -2
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@@ -695,6 +695,8 @@ static void kdump_select_prod_init(void)
unsigned long prefix, ptr, count, tv_sec, i;
struct timeval timeval;
util_log_print(UTIL_LOG_TRACE, "DFI kdump production system dump initialization\n");
if (g.opts.select_specified && !l.kdump_base)
ERR_EXIT("The \"--select\" option is not possible with this "
"dump");
@@ -712,9 +714,10 @@ static void kdump_select_prod_init(void)
}
dfi_cpu_info_init(DFI_CPU_CONTENT_ALL);
for (i = 0; i < count; i++) {
if (dfi_mem_virt_read(ptr + i * sizeof(long), &prefix,
if (dfi_mem_virt_read(dfi_vm_vtop(ptr) + i * sizeof(long), &prefix,
sizeof(prefix)))
continue;
prefix = dfi_vm_vtop(prefix);
if (prefix == 0)
continue;
if (prefix % 0x1000)
@@ -736,7 +739,7 @@ static void utsname_init(void)
if (dfi_vmcoreinfo_symbol(&ptr, "init_uts_ns"))
return;
if (dfi_mem_virt_read(ptr, buf, sizeof(buf)))
if (dfi_mem_virt_read(dfi_vm_vtop(ptr), buf, sizeof(buf)))
return;
utsname = memchr(buf, 'L', sizeof(buf) - sizeof(*utsname));
if (!utsname)