[PATCH 11/25] [PATCH] introduce paravirt_release_pgd()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This patch introduces a new macro/function that informs a paravirt
guest when its page table is not more in use, and can be released.
In case we're not paravirt, just do nothing.

Signed-off-by: Glauber de Oliveira Costa <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
---
 include/asm-x86_64/pgalloc.h |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/include/asm-x86_64/pgalloc.h b/include/asm-x86_64/pgalloc.h
index b467be6..dbe1267 100644
--- a/include/asm-x86_64/pgalloc.h
+++ b/include/asm-x86_64/pgalloc.h
@@ -9,6 +9,12 @@
 #define QUICK_PGD 0	/* We preserve special mappings over free */
 #define QUICK_PT 1	/* Other page table pages that are zero on free */
 
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+#define paravirt_release_pgd(pgd) do { } while (0)
+#endif
+
 #define pmd_populate_kernel(mm, pmd, pte) \
 		set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
 #define pud_populate(mm, pud, pmd) \
@@ -100,6 +106,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 static inline void pgd_free(pgd_t *pgd)
 {
 	BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
+	paravirt_release_pgd(pgd);
 	quicklist_free(QUICK_PGD, pgd_dtor, pgd);
 }
 
-- 
1.4.4.2

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux