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xen: use host E820 map for dom0 

When running as initial domain, get the real physical memory map from
xen using the XENMEM_machine_memory_map hypercall and use it to setup
the e820 regions.

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>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Ian Campbell 2010-09-02 16:16:00 +01:00 committed by Jeremy Fitzhardinge
parent 375b2a9ada
commit 9e9a5fcb04
1 changed files with 7 additions and 2 deletions
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9
arch/x86/xen/setup.c
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@ -149,6 +149,7 @@ char * __init xen_memory_setup(void)
unsigned long extra_pages = 0;
unsigned long extra_limit;
int i;
int op;
max_pfn = min(MAX_DOMAIN_PAGES, max_pfn);
mem_end = PFN_PHYS(max_pfn);
@ -156,7 +157,10 @@ char * __init xen_memory_setup(void)
memmap.nr_entries = E820MAX;
set_xen_guest_handle(memmap.buffer, map);
rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
op = xen_initial_domain() ?
XENMEM_machine_memory_map :
XENMEM_memory_map;
rc = HYPERVISOR_memory_op(op, &memmap);
if (rc == -ENOSYS) {
memmap.nr_entries = 1;
map[0].addr = 0ULL;
@ -235,7 +239,8 @@ char * __init xen_memory_setup(void)
else
extra_pages = 0;
xen_add_extra_mem(extra_pages);
if (!xen_initial_domain())
xen_add_extra_mem(extra_pages);
return "Xen";
}