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xen: add xen_set_domain_pte()

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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>
This commit is contained in:
Jeremy Fitzhardinge 2009-02-09 12:05:49 -08:00 committed by Jeremy Fitzhardinge
parent 655d406a7c
commit eba3ff8b99
2 changed files with 9 additions and 2 deletions
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1
arch/x86/include/asm/xen/page.h
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@ -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);

10
arch/x86/xen/mmu.c
View file

@ -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)
{