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Commit 626d7508 authored by Juergen Gross's avatar Juergen Gross Committed by David Vrabel
Browse files

xen: switch extra memory accounting to use pfns 



Instead of using physical addresses for accounting of extra memory
areas available for ballooning switch to pfns as this is much less
error prone regarding partial pages.

Reported-by: default avatarRoger Pau Monné <roger.pau@citrix.com>
Tested-by: default avatarRoger Pau Monné <roger.pau@citrix.com>
Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
parent cb9e444b

arch/x86/xen/setup.c

+44 −36
Original line number Diff line number Diff line
@@ -90,62 +90,69 @@ static void __init xen_parse_512gb(void) 
	xen_512gb_limit = val;

}



static void __init xen_add_extra_mem(phys_addr_t start, phys_addr_t size)

static void __init xen_add_extra_mem(unsigned long start_pfn,

				     unsigned long n_pfns)

{

	int i;



	/*

	 * No need to check for zero size, should happen rarely and will only

	 * write a new entry regarded to be unused due to zero size.

	 */

	for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {

		/* Add new region. */

		if (xen_extra_mem[i].size == 0) {

			xen_extra_mem[i].start = start;

			xen_extra_mem[i].size  = size;

		if (xen_extra_mem[i].n_pfns == 0) {

			xen_extra_mem[i].start_pfn = start_pfn;

			xen_extra_mem[i].n_pfns = n_pfns;

			break;

		}

		/* Append to existing region. */

		if (xen_extra_mem[i].start + xen_extra_mem[i].size == start) {

			xen_extra_mem[i].size += size;

		if (xen_extra_mem[i].start_pfn + xen_extra_mem[i].n_pfns ==

		    start_pfn) {

			xen_extra_mem[i].n_pfns += n_pfns;

			break;

		}

	}

	if (i == XEN_EXTRA_MEM_MAX_REGIONS)

		printk(KERN_WARNING "Warning: not enough extra memory regions\n");



	memblock_reserve(start, size);

	memblock_reserve(PFN_PHYS(start_pfn), PFN_PHYS(n_pfns));

}



static void __init xen_del_extra_mem(phys_addr_t start, phys_addr_t size)

static void __init xen_del_extra_mem(unsigned long start_pfn,

				     unsigned long n_pfns)

{

	int i;

	phys_addr_t start_r, size_r;

	unsigned long start_r, size_r;



	for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {

		start_r = xen_extra_mem[i].start;

		size_r = xen_extra_mem[i].size;

		start_r = xen_extra_mem[i].start_pfn;

		size_r = xen_extra_mem[i].n_pfns;



		/* Start of region. */

		if (start_r == start) {

			BUG_ON(size > size_r);

			xen_extra_mem[i].start += size;

			xen_extra_mem[i].size -= size;

		if (start_r == start_pfn) {

			BUG_ON(n_pfns > size_r);

			xen_extra_mem[i].start_pfn += n_pfns;

			xen_extra_mem[i].n_pfns -= n_pfns;

			break;

		}

		/* End of region. */

		if (start_r + size_r == start + size) {

			BUG_ON(size > size_r);

			xen_extra_mem[i].size -= size;

		if (start_r + size_r == start_pfn + n_pfns) {

			BUG_ON(n_pfns > size_r);

			xen_extra_mem[i].n_pfns -= n_pfns;

			break;

		}

		/* Mid of region. */

		if (start > start_r && start < start_r + size_r) {

			BUG_ON(start + size > start_r + size_r);

			xen_extra_mem[i].size = start - start_r;

		if (start_pfn > start_r && start_pfn < start_r + size_r) {

			BUG_ON(start_pfn + n_pfns > start_r + size_r);

			xen_extra_mem[i].n_pfns = start_pfn - start_r;

			/* Calling memblock_reserve() again is okay. */

			xen_add_extra_mem(start + size, start_r + size_r -

					  (start + size));

			xen_add_extra_mem(start_pfn + n_pfns, start_r + size_r -

					  (start_pfn + n_pfns));

			break;

		}

	}

	memblock_free(start, size);

	memblock_free(PFN_PHYS(start_pfn), PFN_PHYS(n_pfns));

}



/*
@@ -156,11 +163,10 @@ static void __init xen_del_extra_mem(phys_addr_t start, phys_addr_t size) 
unsigned long __ref xen_chk_extra_mem(unsigned long pfn)

{

	int i;

	phys_addr_t addr = PFN_PHYS(pfn);



	for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {

		if (addr >= xen_extra_mem[i].start &&

		    addr < xen_extra_mem[i].start + xen_extra_mem[i].size)

		if (pfn >= xen_extra_mem[i].start_pfn &&

		    pfn < xen_extra_mem[i].start_pfn + xen_extra_mem[i].n_pfns)

			return INVALID_P2M_ENTRY;

	}
@@ -176,10 +182,10 @@ void __init xen_inv_extra_mem(void) 
	int i;



	for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {

		if (!xen_extra_mem[i].size)

		if (!xen_extra_mem[i].n_pfns)

			continue;

		pfn_s = PFN_DOWN(xen_extra_mem[i].start);

		pfn_e = PFN_UP(xen_extra_mem[i].start + xen_extra_mem[i].size);

		pfn_s = xen_extra_mem[i].start_pfn;

		pfn_e = pfn_s + xen_extra_mem[i].n_pfns;

		for (pfn = pfn_s; pfn < pfn_e; pfn++)

			set_phys_to_machine(pfn, INVALID_P2M_ENTRY);

	}
@@ -507,7 +513,7 @@ void __init xen_remap_memory(void) 
		} else if (pfn_s + len == xen_remap_buf.target_pfn) {

			len += xen_remap_buf.size;

		} else {

			xen_del_extra_mem(PFN_PHYS(pfn_s), PFN_PHYS(len));

			xen_del_extra_mem(pfn_s, len);

			pfn_s = xen_remap_buf.target_pfn;

			len = xen_remap_buf.size;

		}
@@ -517,7 +523,7 @@ void __init xen_remap_memory(void) 
	}



	if (pfn_s != ~0UL && len)

		xen_del_extra_mem(PFN_PHYS(pfn_s), PFN_PHYS(len));

		xen_del_extra_mem(pfn_s, len);



	set_pte_mfn(buf, mfn_save, PAGE_KERNEL);
@@ -744,7 +750,7 @@ static void __init xen_reserve_xen_mfnlist(void) 
 **/

char * __init xen_memory_setup(void)

{

	unsigned long max_pfn;

	unsigned long max_pfn, pfn_s, n_pfns;

	phys_addr_t mem_end, addr, size, chunk_size;

	u32 type;

	int rc;
@@ -831,9 +837,11 @@ char * __init xen_memory_setup(void) 
				chunk_size = min(size, mem_end - addr);

			} else if (extra_pages) {

				chunk_size = min(size, PFN_PHYS(extra_pages));

				extra_pages -= PFN_DOWN(chunk_size);

				xen_add_extra_mem(addr, chunk_size);

				xen_max_p2m_pfn = PFN_DOWN(addr + chunk_size);

				pfn_s = PFN_UP(addr);

				n_pfns = PFN_DOWN(addr + chunk_size) - pfn_s;

				extra_pages -= n_pfns;

				xen_add_extra_mem(pfn_s, n_pfns);

				xen_max_p2m_pfn = pfn_s + n_pfns;

			} else

				type = E820_UNUSABLE;

		}

drivers/xen/balloon.c

+3 −3
Original line number Diff line number Diff line
@@ -638,9 +638,9 @@ static int __init balloon_init(void) 
	 * regions (see arch/x86/xen/setup.c).

	 */

	for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++)

		if (xen_extra_mem[i].size)

			balloon_add_region(PFN_UP(xen_extra_mem[i].start),

					   PFN_DOWN(xen_extra_mem[i].size));

		if (xen_extra_mem[i].n_pfns)

			balloon_add_region(xen_extra_mem[i].start_pfn,

					   xen_extra_mem[i].n_pfns);



	return 0;

}

include/xen/page.h

+2 −2
Original line number Diff line number Diff line
@@ -9,8 +9,8 @@ static inline unsigned long page_to_mfn(struct page *page) 
}



struct xen_memory_region {

	phys_addr_t start;

	phys_addr_t size;

	unsigned long start_pfn;

	unsigned long n_pfns;

};



#define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820MAX */