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| author | Alex Thorlton <athorlton@sgi.com> | 2016-12-05 11:49:14 -0600 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2016-12-09 10:59:08 +0100 |
| commit | 738662c35c491fc360bb6adcb8a0db88d87b5d88 (patch) | |
| tree | beaf3030fc230acaab2c695609d45485d507853d /arch/x86/xen/setup.c | |
| parent | 9d2f86c6cad5a8a3f0b38a80136ba68364ca7278 (diff) | |
| download | linux-stable-738662c35c491fc360bb6adcb8a0db88d87b5d88.tar.gz linux-stable-738662c35c491fc360bb6adcb8a0db88d87b5d88.tar.bz2 linux-stable-738662c35c491fc360bb6adcb8a0db88d87b5d88.zip | |
xen/x86: Increase xen_e820_map to E820_X_MAX possible entries
On systems with sufficiently large e820 tables, and several IOAPICs, it
is possible for the XENMEM_machine_memory_map callback (and its
counterpart, XENMEM_memory_map) to attempt to return an e820 table with
more than 128 entries. This callback adds entries to the BIOS-provided
e820 table to account for IOAPIC registers, which, on sufficiently large
systems, can result in an e820 table that is too large to copy back into
xen_e820_map.
This change simply increases the size of xen_e820_map to E820_X_MAX to
ensure that there is enough room to store the entire e820 map returned
from this callback.
Signed-off-by: Alex Thorlton <athorlton@sgi.com>
Suggested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'arch/x86/xen/setup.c')
| -rw-r--r-- | arch/x86/xen/setup.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index f8960fca0827..8c394e30e5fe 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -41,7 +41,7 @@ struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata; unsigned long xen_released_pages; /* E820 map used during setting up memory. */ -static struct e820entry xen_e820_map[E820MAX] __initdata; +static struct e820entry xen_e820_map[E820_X_MAX] __initdata; static u32 xen_e820_map_entries __initdata; /* @@ -750,7 +750,7 @@ char * __init xen_memory_setup(void) max_pfn = min(max_pfn, xen_start_info->nr_pages); mem_end = PFN_PHYS(max_pfn); - memmap.nr_entries = E820MAX; + memmap.nr_entries = ARRAY_SIZE(xen_e820_map); set_xen_guest_handle(memmap.buffer, xen_e820_map); op = xen_initial_domain() ? @@ -923,7 +923,7 @@ char * __init xen_auto_xlated_memory_setup(void) int i; int rc; - memmap.nr_entries = E820MAX; + memmap.nr_entries = ARRAY_SIZE(xen_e820_map); set_xen_guest_handle(memmap.buffer, xen_e820_map); rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap); |