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authorJeremy Fitzhardinge <jeremy@goop.org>2008-06-25 00:19:12 -0400
committerIngo Molnar <mingo@elte.hu>2008-07-08 13:11:01 +0200
commiteba0045ff87bab465d3c80c289f3bf709c1800f5 (patch)
treee015805494c1ddb427fa568619163913270963bd /arch/x86/mm
parent67350a5c4514c280665cdb45439d32a008a264ba (diff)
x86/paravirt: add a pgd_alloc/free hooks
Add hooks which are called at pgd_alloc/free time. The pgd_alloc hook may return an error code, which if non-zero, causes the pgd allocation to be failed. The hooks may be used to allocate/free auxillary per-pgd information. also fix: > * Ingo Molnar <mingo@elte.hu> wrote: > > include/asm/pgalloc.h: In function ‘paravirt_pgd_free': > include/asm/pgalloc.h:14: error: parameter name omitted > arch/x86/kernel/entry_64.S: In file included from > arch/x86/kernel/traps_64.c:51:include/asm/pgalloc.h: In function ‘paravirt_pgd_free': > include/asm/pgalloc.h:14: error: parameter name omitted Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: xen-devel <xen-devel@lists.xensource.com> Cc: Stephen Tweedie <sct@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/pgtable.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 45b99ac3948..418c4432fb3 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -215,13 +215,15 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
/* so that alloc_pmd can use it */
mm->pgd = pgd;
- if (pgd)
+ if (pgd) {
pgd_ctor(pgd);
- if (pgd && !pgd_prepopulate_pmd(mm, pgd)) {
- pgd_dtor(pgd);
- free_page((unsigned long)pgd);
- pgd = NULL;
+ if (paravirt_pgd_alloc(mm) != 0 ||
+ !pgd_prepopulate_pmd(mm, pgd)) {
+ pgd_dtor(pgd);
+ free_page((unsigned long)pgd);
+ pgd = NULL;
+ }
}
return pgd;
@@ -231,6 +233,7 @@ void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
pgd_mop_up_pmds(mm, pgd);
pgd_dtor(pgd);
+ paravirt_pgd_free(mm, pgd);
free_page((unsigned long)pgd);
}