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xen: use same main loop for counting and remapping pages

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Instead of having two functions for cycling through the E820 map in
order to count to be remapped pages and remap them later, just use one
function with a caller supplied sub-function called for each region to
be processed. This eliminates the possibility of a mismatch between
both loops which showed up in certain configurations.

Suggested-by: Ed Swierk <eswierk@skyportsystems.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Juergen Gross 2016-05-18 16:44:54 +02:00 committed by David Vrabel
parent f0f393877c
commit dd14be92fb
1 changed files with 26 additions and 39 deletions
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65
arch/x86/xen/setup.c
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@ -393,6 +393,9 @@ static unsigned long __init xen_set_identity_and_remap_chunk(
unsigned long i = 0;
unsigned long n = end_pfn - start_pfn;
if (remap_pfn == 0)
remap_pfn = nr_pages;
while (i < n) {
unsigned long cur_pfn = start_pfn + i;
unsigned long left = n - i;
@ -438,17 +441,29 @@ static unsigned long __init xen_set_identity_and_remap_chunk(
return remap_pfn;
}
static void __init xen_set_identity_and_remap(unsigned long nr_pages)
static unsigned long __init xen_count_remap_pages(
unsigned long start_pfn, unsigned long end_pfn, unsigned long nr_pages,
unsigned long remap_pages)
{
if (start_pfn >= nr_pages)
return remap_pages;
return remap_pages + min(end_pfn, nr_pages) - start_pfn;
}
static unsigned long __init xen_foreach_remap_area(unsigned long nr_pages,
unsigned long (*func)(unsigned long start_pfn, unsigned long end_pfn,
unsigned long nr_pages, unsigned long last_val))
{
phys_addr_t start = 0;
unsigned long last_pfn = nr_pages;
unsigned long ret_val = 0;
const struct e820entry *entry = xen_e820_map;
int i;
/*
* Combine non-RAM regions and gaps until a RAM region (or the
* end of the map) is reached, then set the 1:1 map and
* remap the memory in those non-RAM regions.
* end of the map) is reached, then call the provided function
* to perform its duty on the non-RAM region.
*
* The combined non-RAM regions are rounded to a whole number
* of pages so any partial pages are accessible via the 1:1
@ -466,14 +481,13 @@ static void __init xen_set_identity_and_remap(unsigned long nr_pages)
end_pfn = PFN_UP(entry->addr);
if (start_pfn < end_pfn)
last_pfn = xen_set_identity_and_remap_chunk(
start_pfn, end_pfn, nr_pages,
last_pfn);
ret_val = func(start_pfn, end_pfn, nr_pages,
ret_val);
start = end;
}
}
pr_info("Released %ld page(s)\n", xen_released_pages);
return ret_val;
}
/*
@ -596,35 +610,6 @@ static void __init xen_ignore_unusable(void)
}
}
static unsigned long __init xen_count_remap_pages(unsigned long max_pfn)
{
unsigned long extra = 0;
unsigned long start_pfn, end_pfn;
const struct e820entry *entry = xen_e820_map;
int i;
end_pfn = 0;
for (i = 0; i < xen_e820_map_entries; i++, entry++) {
start_pfn = PFN_DOWN(entry->addr);
/* Adjacent regions on non-page boundaries handling! */
end_pfn = min(end_pfn, start_pfn);
if (start_pfn >= max_pfn)
return extra + max_pfn - end_pfn;
/* Add any holes in map to result. */
extra += start_pfn - end_pfn;
end_pfn = PFN_UP(entry->addr + entry->size);
end_pfn = min(end_pfn, max_pfn);
if (entry->type != E820_RAM)
extra += end_pfn - start_pfn;
}
return extra;
}
bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size)
{
struct e820entry *entry;
@ -804,7 +789,7 @@ char * __init xen_memory_setup(void)
max_pages = xen_get_max_pages();
/* How many extra pages do we need due to remapping? */
max_pages += xen_count_remap_pages(max_pfn);
max_pages += xen_foreach_remap_area(max_pfn, xen_count_remap_pages);
if (max_pages > max_pfn)
extra_pages += max_pages - max_pfn;
@ -922,7 +907,9 @@ char * __init xen_memory_setup(void)
* Set identity map on non-RAM pages and prepare remapping the
* underlying RAM.
*/
xen_set_identity_and_remap(max_pfn);
xen_foreach_remap_area(max_pfn, xen_set_identity_and_remap_chunk);
pr_info("Released %ld page(s)\n", xen_released_pages);
return "Xen";
}