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xen: implement XENMEM_machphys_mapping

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This hypercall allows Xen to specify a non-default location for the
machine to physical mapping. This capability is used when running a 32
bit domain 0 on a 64 bit hypervisor to shrink the hypervisor hole to
exactly the size required.

[ Impact: add Xen hypercall definitions ]

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Ian Campbell
2010-09-30 12:37:26 +01:00
committed by Jeremy Fitzhardinge
parent 9ec23a7f6d
commit 7e77506a59
7 changed files with 47 additions and 18 deletions
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14
arch/x86/xen/mmu.c
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@@ -2034,6 +2034,20 @@ static __init void xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
set_page_prot(pmd, PAGE_KERNEL_RO);
}
void __init xen_setup_machphys_mapping(void)
{
struct xen_machphys_mapping mapping;
unsigned long machine_to_phys_nr_ents;
if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, &mapping) == 0) {
machine_to_phys_mapping = (unsigned long *)mapping.v_start;
machine_to_phys_nr_ents = mapping.max_mfn + 1;
} else {
machine_to_phys_nr_ents = MACH2PHYS_NR_ENTRIES;
}
machine_to_phys_order = fls(machine_to_phys_nr_ents - 1);
}
#ifdef CONFIG_X86_64
static void convert_pfn_mfn(void *v)
{