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Commit e612b4a7 authored by Juergen Gross's avatar Juergen Gross Committed by David Vrabel
Browse files

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: default avatarJuergen Gross <jgross@suse.com>
Reviewed-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
Acked-by: default avatarKonrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
parent 5097cdf6

arch/x86/xen/setup.c

+23 −0
Original line number Diff line number Diff line
@@ -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>

arch/x86/xen/xen-ops.h

+1 −0
Original line number Diff line number Diff line
@@ -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);