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    Subject[PATCH 17/25 -v2] introduce paravirt_release_pgd()
    Date
    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 <gcosta@redhat.com>
    Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
    ---
    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
    -
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