From: Paul Mackerras Date: Wed, 18 Jun 2008 06:40:35 +0000 (+1000) Subject: [POWERPC] Clear sub-page HPTE present bits when demoting page size X-Git-Tag: v2.6.26-rc7~18^2 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=65ba6cdc837af9b77354d03987354196ac4eb308;p=linux-2.6 [POWERPC] Clear sub-page HPTE present bits when demoting page size When we demote a slice from 64k to 4k, and we are about to insert an HPTE for a 4k subpage and we notice that there is an existing 64k HPTE, we first invalidate that HPTE before inserting the new 4k subpage HPTE. Since the bits that encode which hash bucket the old HPTE was in overlap with the bits that encode which of the 16 subpages have HPTEs, we need to clear out the subpage HPTE-present bits before starting to insert HPTEs for the 4k subpages. If we don't do that, we can erroneously think that a subpage already has an HPTE when it doesn't. That in itself wouldn't be such a problem except that when we go to update the HPTE that we think is present on machines with a hypervisor, the hypervisor can tell us that the HPTE we think is there is actually there even though it isn't, which can lead to a process getting stuck in a loop, continually faulting. The reason for the confusion is that the AVPN (abbreviated virtual page number) we are looking for in the HPTE for a 4k subpage can actually match the AVPN in a stale HPTE for another 64k page. For example, the HPTE for the 4k subpage at 0x84000f000 will be in the same hash bucket and have the same AVPN as the HPTE for the 64k page at 0x8400f0000. This fixes the code to clear out the subpage HPTE-present bits. Signed-off-by: Paul Mackerras --- diff --git a/arch/powerpc/mm/hash_low_64.S b/arch/powerpc/mm/hash_low_64.S index 21d2484864..70f4c833fa 100644 --- a/arch/powerpc/mm/hash_low_64.S +++ b/arch/powerpc/mm/hash_low_64.S @@ -568,6 +568,10 @@ htab_inval_old_hpte: ld r7,STK_PARM(r9)(r1) /* ssize */ ld r8,STK_PARM(r8)(r1) /* local */ bl .flush_hash_page + /* Clear out _PAGE_HPTE_SUB bits in the new linux PTE */ + lis r0,_PAGE_HPTE_SUB@h + ori r0,r0,_PAGE_HPTE_SUB@l + andc r30,r30,r0 b htab_insert_pte htab_bail_ok: