diff options
| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2007-05-02 19:27:15 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 19:27:15 +0200 |
| commit | ce6234b5298902aaec831a67d5f8d9bd2ef5a488 (patch) | |
| tree | 939c22684e11a4f5f17abb89c4898f016e878e21 /include/asm-i386/paravirt.h | |
| parent | a27fe809b82c5e18932fcceded28d0d1481ce7bb (diff) | |
[PATCH] i386: PARAVIRT: add kmap_atomic_pte for mapping highpte pages
Xen and VMI both have special requirements when mapping a highmem pte
page into the kernel address space. These can be dealt with by adding
a new kmap_atomic_pte() function for mapping highptes, and hooking it
into the paravirt_ops infrastructure.
Xen specifically wants to map the pte page RO, so this patch exposes a
helper function, kmap_atomic_prot, which maps the page with the
specified page protections.
This also adds a kmap_flush_unused() function to clear out the cached
kmap mappings. Xen needs this to clear out any potential stray RW
mappings of pages which will become part of a pagetable.
[ Zach - vmi.c will need some attention after this patch. It wasn't
immediately obvious to me what needs to be done. ]
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Zachary Amsden <zach@vmware.com>
Diffstat (limited to 'include/asm-i386/paravirt.h')
| -rw-r--r-- | include/asm-i386/paravirt.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/asm-i386/paravirt.h b/include/asm-i386/paravirt.h index 10f44af76b4..5048b41428f 100644 --- a/include/asm-i386/paravirt.h +++ b/include/asm-i386/paravirt.h @@ -16,7 +16,9 @@ #ifndef __ASSEMBLY__ #include <linux/types.h> #include <linux/cpumask.h> +#include <asm/kmap_types.h> +struct page; struct thread_struct; struct Xgt_desc_struct; struct tss_struct; @@ -187,6 +189,10 @@ struct paravirt_ops pte_t (*ptep_get_and_clear)(pte_t *ptep); +#ifdef CONFIG_HIGHPTE + void *(*kmap_atomic_pte)(struct page *page, enum km_type type); +#endif + #ifdef CONFIG_X86_PAE void (*set_pte_atomic)(pte_t *ptep, pte_t pteval); void (*set_pte_present)(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte); @@ -884,6 +890,15 @@ static inline void paravirt_release_pd(unsigned pfn) PVOP_VCALL1(release_pd, pfn); } +#ifdef CONFIG_HIGHPTE +static inline void *kmap_atomic_pte(struct page *page, enum km_type type) +{ + unsigned long ret; + ret = PVOP_CALL2(unsigned long, kmap_atomic_pte, page, type); + return (void *)ret; +} +#endif + static inline void pte_update(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { |