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x86/xen: discard RAM regions above the maximum reservation

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During setup, discard RAM regions that are above the maximum
reservation (instead of marking them as E820_UNUSABLE).  This allows
hotplug memory to be placed at these addresses.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
David Vrabel 2015-01-19 11:08:05 +00:00
parent f6a6cb1afe
commit f5775e0b61
1 changed files with 5 additions and 2 deletions
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7
arch/x86/xen/setup.c
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@ -829,6 +829,8 @@ char * __init xen_memory_setup(void)
addr = xen_e820_map[0].addr; addr = xen_e820_map[0].addr;
size = xen_e820_map[0].size; size = xen_e820_map[0].size;
while (i < xen_e820_map_entries) { while (i < xen_e820_map_entries) {
bool discard = false;
chunk_size = size; chunk_size = size;
type = xen_e820_map[i].type; type = xen_e820_map[i].type;
@ -843,10 +845,11 @@ char * __init xen_memory_setup(void)
xen_add_extra_mem(pfn_s, n_pfns); xen_add_extra_mem(pfn_s, n_pfns);
xen_max_p2m_pfn = pfn_s + n_pfns; xen_max_p2m_pfn = pfn_s + n_pfns;
} else } else
type = E820_UNUSABLE; discard = true;
} }
xen_align_and_add_e820_region(addr, chunk_size, type); if (!discard)
xen_align_and_add_e820_region(addr, chunk_size, type);
addr += chunk_size; addr += chunk_size;
size -= chunk_size; size -= chunk_size;