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x86/xen: add extra memory for remapped frames during setup

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If the non-RAM regions in the e820 memory map are larger than the size
of the initial balloon, a BUG was triggered as the frames are remaped
beyond the limit of the linear p2m.  The frames are remapped into the
initial balloon area (xen_extra_mem) but not enough of this is
available.

Ensure enough extra memory regions are added for these remapped
frames.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
David Vrabel 2015-01-07 11:21:50 +00:00
parent bc7142cf79
commit a97dae1a2e
1 changed files with 9 additions and 4 deletions
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13
arch/x86/xen/setup.c
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@ -366,7 +366,7 @@ static void __init xen_do_set_identity_and_remap_chunk(
static unsigned long __init xen_set_identity_and_remap_chunk(
const struct e820entry *list, size_t map_size, unsigned long start_pfn,
unsigned long end_pfn, unsigned long nr_pages, unsigned long remap_pfn,
unsigned long *released)
unsigned long *released, unsigned long *remapped)
{
unsigned long pfn;
unsigned long i = 0;
@ -404,6 +404,7 @@ static unsigned long __init xen_set_identity_and_remap_chunk(
/* Update variables to reflect new mappings. */
i += size;
remap_pfn += size;
*remapped += size;
}
/*
@ -420,12 +421,13 @@ static unsigned long __init xen_set_identity_and_remap_chunk(
static void __init xen_set_identity_and_remap(
const struct e820entry *list, size_t map_size, unsigned long nr_pages,
unsigned long *released)
unsigned long *released, unsigned long *remapped)
{
phys_addr_t start = 0;
unsigned long last_pfn = nr_pages;
const struct e820entry *entry;
unsigned long num_released = 0;
unsigned long num_remapped = 0;
int i;
/*
@ -452,12 +454,13 @@ static void __init xen_set_identity_and_remap(
last_pfn = xen_set_identity_and_remap_chunk(
list, map_size, start_pfn,
end_pfn, nr_pages, last_pfn,
&num_released);
&num_released, &num_remapped);
start = end;
}
}
*released = num_released;
*remapped = num_remapped;
pr_info("Released %ld page(s)\n", num_released);
}
@ -577,6 +580,7 @@ char * __init xen_memory_setup(void)
struct xen_memory_map memmap;
unsigned long max_pages;
unsigned long extra_pages = 0;
unsigned long remapped_pages;
int i;
int op;
@ -626,9 +630,10 @@ char * __init xen_memory_setup(void)
* underlying RAM.
*/
xen_set_identity_and_remap(map, memmap.nr_entries, max_pfn,
&xen_released_pages);
&xen_released_pages, &remapped_pages);
extra_pages += xen_released_pages;
extra_pages += remapped_pages;
/*
* Clamp the amount of extra memory to a EXTRA_MEM_RATIO