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KVM: MTRR: introduce fixed_mtrr_addr_* functions 

Two functions are introduced:
- fixed_mtrr_addr_to_seg() translates the address to the fixed
  MTRR segment

- fixed_mtrr_addr_seg_to_range_index() translates the address to
  the index of kvm_mtrr.fixed_ranges[]

They will be used in the later patch

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
[Adjust for range_size->range_shift change. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiao Guangrong 2015-06-15 16:55:32 +08:00 committed by Paolo Bonzini
parent 19efffa244
commit f7bfb57b3e
1 changed files with 25 additions and 0 deletions
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25
arch/x86/kvm/mtrr.c
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@ -241,6 +241,31 @@ static int fixed_msr_to_range_index(u32 msr)
return fixed_mtrr_seg_unit_range_index(seg, unit);
}
static int fixed_mtrr_addr_to_seg(u64 addr)
{
struct fixed_mtrr_segment *mtrr_seg;
int seg, seg_num = ARRAY_SIZE(fixed_seg_table);
for (seg = 0; seg < seg_num; seg++) {
mtrr_seg = &fixed_seg_table[seg];
if (mtrr_seg->start >= addr && addr < mtrr_seg->end)
return seg;
}
return -1;
}
static int fixed_mtrr_addr_seg_to_range_index(u64 addr, int seg)
{
struct fixed_mtrr_segment *mtrr_seg;
int index;
mtrr_seg = &fixed_seg_table[seg];
index = mtrr_seg->range_start;
index += (addr - mtrr_seg->start) >> mtrr_seg->range_shift;
return index;
}
static void var_mtrr_range(struct kvm_mtrr_range *range, u64 *start, u64 *end)
{
u64 mask;