diff options
| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2009-02-09 12:05:49 -0800 |
|---|---|---|
| committer | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-10-20 16:22:27 -0700 |
| commit | eba3ff8b99863bcc9e66b8d528e4750229e29693 (patch) | |
| tree | 478e2e9e00751c5593be1424fba36ed461c2e306 | |
| parent | 655d406a7c80bffc03263d071b6ba1e0fcf548f9 (diff) | |
xen: add xen_set_domain_pte()
Add xen_set_domain_pte() to allow setting a pte mapping a page from
another domain. The common case is to map from DOMID_IO, the pseudo
domain which owns all IO pages, but will also be used in the privcmd
interface to map other domain pages.
[ Impact: new Xen-internal API for cross-domain mappings ]
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
| -rw-r--r-- | arch/x86/include/asm/xen/page.h | 1 | ||||
| -rw-r--r-- | arch/x86/xen/mmu.c | 10 |
2 files changed, 9 insertions, 2 deletions
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h index bf5f7d32bd0..5e0eb875891 100644 --- a/arch/x86/include/asm/xen/page.h +++ b/arch/x86/include/asm/xen/page.h @@ -159,6 +159,7 @@ static inline pte_t __pte_ma(pteval_t x) #define pgd_val_ma(x) ((x).pgd) +void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid); xmaddr_t arbitrary_virt_to_machine(void *address); unsigned long arbitrary_virt_to_mfn(void *vaddr); diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index 42086ac406a..1ceb0f2fa0a 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -395,7 +395,7 @@ static bool xen_iomap_pte(pte_t pte) return pte_flags(pte) & _PAGE_IOMAP; } -static void xen_set_iomap_pte(pte_t *ptep, pte_t pteval) +void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid) { struct multicall_space mcs; struct mmu_update *u; @@ -407,10 +407,16 @@ static void xen_set_iomap_pte(pte_t *ptep, pte_t pteval) u->ptr = arbitrary_virt_to_machine(ptep).maddr; u->val = pte_val_ma(pteval); - MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, DOMID_IO); + MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, domid); xen_mc_issue(PARAVIRT_LAZY_MMU); } +EXPORT_SYMBOL_GPL(xen_set_domain_pte); + +static void xen_set_iomap_pte(pte_t *ptep, pte_t pteval) +{ + xen_set_domain_pte(ptep, pteval, DOMID_IO); +} static void xen_extend_mmu_update(const struct mmu_update *update) { |