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xen: check memory area against e820 map 

Provide a service routine to check a physical memory area against the
E820 map. The routine will return false if the complete area is RAM
according to the E820 map and true otherwise.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Juergen Gross 2015-07-17 06:51:28 +02:00 committed by David Vrabel
parent 5097cdf6ce
commit e612b4a7db
2 changed files with 24 additions and 0 deletions
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23
arch/x86/xen/setup.c
View File

@ -573,6 +573,29 @@ static unsigned long __init xen_count_remap_pages(unsigned long max_pfn)
return extra;
}
bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size)
{
struct e820entry *entry;
unsigned mapcnt;
phys_addr_t end;
if (!size)
return false;
end = start + size;
entry = xen_e820_map;
for (mapcnt = 0; mapcnt < xen_e820_map_entries; mapcnt++) {
if (entry->type == E820_RAM && entry->addr <= start &&
(entry->addr + entry->size) >= end)
return false;
entry++;
}
return true;
}
/*
* Reserve Xen mfn_list.
* See comment above "struct start_info" in <xen/interface/xen.h>

1
arch/x86/xen/xen-ops.h
View File

@ -39,6 +39,7 @@ void xen_reserve_top(void);
void xen_mm_pin_all(void);
void xen_mm_unpin_all(void);
bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size);
unsigned long __ref xen_chk_extra_mem(unsigned long pfn);
void __init xen_inv_extra_mem(void);
void __init xen_remap_memory(void);