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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2009-02-09 21:05:49 +0100 |
|---|---|---|
| committer | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-10-21 01:22:27 +0200 |
| commit | eba3ff8b99863bcc9e66b8d528e4750229e29693 (patch) | |
| tree | 478e2e9e00751c5593be1424fba36ed461c2e306 /arch/x86/xen/mmu.c | |
| parent | xen: add /proc/xen/xsd_{kva,port} to xenfs (diff) | |
| download | linux-eba3ff8b99863bcc9e66b8d528e4750229e29693.tar.xz linux-eba3ff8b99863bcc9e66b8d528e4750229e29693.zip | |
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>
Diffstat (limited to 'arch/x86/xen/mmu.c')
| -rw-r--r-- | arch/x86/xen/mmu.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index 42086ac406af..1ceb0f2fa0af 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) { |