Add large page support for s390x
Michael Holzheu wrote:
Hi Dave,
Please include this patch in the next crash release:
The new z10 System z (s390x) machines have now support for large pages (1MB). This patch
updates the s390x page table walk function in order to handle this.
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
---
s390x.c | 5 +++++
1 files changed, 5 insertions(+)
diff -Naurp crash-4.0-6.2/s390x.c crash-4.0-6.2-s390x-large-page/s390x.c
--- crash-4.0-6.2/s390x.c 2008-04-11 14:42:35.000000000 +0200
+++ crash-4.0-6.2-s390x-large-page/s390x.c 2008-04-11 14:42:41.000000000 +0200
@@ -337,6 +337,11 @@ int s390x_vtop(ulong table, ulong vaddr,
level--;
}
+ /* Check if this is a large page. */
+ if (entry & 0x400ULL)
+ /* Add the 1MB page offset and return the final value. */
+ return table + (vaddr & 0xfffffULL);
+
/* Get the page table entry */
entry = _kl_pg_table_deref_s390x(vaddr, entry & ~0x7ffULL);
if (!entry)
OK -- queued for the next release.
Thanks,
Dave
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