powerpc/fadump: align destination address to pagesize

On crash, boot memory area is copied to a destination address by f/w.
This region is setup as separate PT_LOAD segment with appropriate
offset to handle the different physical address and offset in vmcore.
If this destination address is not page aligned, reading the vmcore
with mmap is likely to fail forcing tools like makedumpfile to fall
back to regular read. Avoid mmap read failure by ensuring that the
destination address is always page aligned.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220406093839.206608-3-hbathini@linux.ibm.com

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 044fbf7..4f2bd79 100644 (file)
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -365,6 +365,11 @@ static unsigned long __init get_fadump_area_size(void)
 
        size += fw_dump.cpu_state_data_size;
        size += fw_dump.hpte_region_size;
+       /*
+        * Account for pagesize alignment of boot memory area destination address.
+        * This faciliates in mmap reading of first kernel's memory.
+        */
+       size = PAGE_ALIGN(size);
        size += fw_dump.boot_memory_size;
        size += sizeof(struct fadump_crash_info_header);
        size += sizeof(struct elfhdr); /* ELF core header.*/

diff --git a/arch/powerpc/platforms/pseries/rtas-fadump.c b/arch/powerpc/platforms/pseries/rtas-fadump.c
index 617c0f3..bc8d1ce 100644 (file)
--- a/arch/powerpc/platforms/pseries/rtas-fadump.c
+++ b/arch/powerpc/platforms/pseries/rtas-fadump.c
@@ -108,6 +108,12 @@ static u64 rtas_fadump_init_mem_struct(struct fw_dump *fadump_conf)
        fdm.hpte_region.destination_address = cpu_to_be64(addr);
        addr += fadump_conf->hpte_region_size;
 
+       /*
+        * Align boot memory area destination address to page boundary to
+        * be able to mmap read this area in the vmcore.
+        */
+       addr = PAGE_ALIGN(addr);
+
        /* RMA region section */
        fdm.rmr_region.request_flag = cpu_to_be32(RTAS_FADUMP_REQUEST_FLAG);
        fdm.rmr_region.source_data_type =