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Commit f7bfb57b authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Paolo Bonzini
Browse files

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: default avatarXiao Guangrong <guangrong.xiao@linux.intel.com>
[Adjust for range_size->range_shift change. - Paolo]
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 19efffa2

arch/x86/kvm/mtrr.c

+25 −0
Original line number Diff line number Diff line
@@ -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;