diff options
| author | Jan Beulich <JBeulich@novell.com> | 2011-08-16 15:07:41 +0100 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-08-17 10:26:48 -0400 |
| commit | ccbcdf7cf1b5f6c6db30d84095b9c6c53043af55 (patch) | |
| tree | d1c37475f699fcf1ef48f829f379f7cecda357e1 /arch/x86/xen/mmu.c | |
| parent | 30eefc95841ce51c3281876f0b954dd1d3c0bd5f (diff) | |
xen/x86: replace order-based range checking of M2P table by linear one
The order-based approach is not only less efficient (requiring a shift
and a compare, typical generated code looking like this
mov eax, [machine_to_phys_order]
mov ecx, eax
shr ebx, cl
test ebx, ebx
jnz ...
whereas a direct check requires just a compare, like in
cmp ebx, [machine_to_phys_nr]
jae ...
), but also slightly dangerous in the 32-on-64 case - the element
address calculation can wrap if the next power of two boundary is
sufficiently far away from the actual upper limit of the table, and
hence can result in user space addresses being accessed (with it being
unknown what may actually be mapped there).
Additionally, the elimination of the mistaken use of fls() here (should
have been __fls()) fixes a latent issue on x86-64 that would trigger
if the code was run on a system with memory extending beyond the 44-bit
boundary.
CC: stable@kernel.org
Signed-off-by: Jan Beulich <jbeulich@novell.com>
[v1: Based on Jeremy's feedback]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/xen/mmu.c')
| -rw-r--r-- | arch/x86/xen/mmu.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index f987bde77c49..24abc1f50dc5 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -1713,15 +1713,19 @@ static void __init xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn) void __init xen_setup_machphys_mapping(void) { struct xen_machphys_mapping mapping; - unsigned long machine_to_phys_nr_ents; if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, &mapping) == 0) { machine_to_phys_mapping = (unsigned long *)mapping.v_start; - machine_to_phys_nr_ents = mapping.max_mfn + 1; + machine_to_phys_nr = mapping.max_mfn + 1; } else { - machine_to_phys_nr_ents = MACH2PHYS_NR_ENTRIES; + machine_to_phys_nr = MACH2PHYS_NR_ENTRIES; } - machine_to_phys_order = fls(machine_to_phys_nr_ents - 1); +#ifdef CONFIG_X86_32 + if ((machine_to_phys_mapping + machine_to_phys_nr) + < machine_to_phys_mapping) + machine_to_phys_nr = (unsigned long *)NULL + - machine_to_phys_mapping; +#endif } #ifdef CONFIG_X86_64 |