From eba3ff8b99863bcc9e66b8d528e4750229e29693 Mon Sep 17 00:00:00 2001
From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Mon, 9 Feb 2009 12:05:49 -0800
Subject: 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>
---
arch/x86/xen/mmu.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
(limited to 'arch/x86/xen/mmu.c')
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)
{
--
cgit v1.2.3-70-g09d2