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Subject[PATCH 11/15] KVM: MTRR: introduce fixed_mtrr_addr_* functions
Date
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>
---
arch/x86/kvm/mtrr.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c
index 8e3b81a..e59d138 100644
--- a/arch/x86/kvm/mtrr.c
+++ b/arch/x86/kvm/mtrr.c
@@ -217,6 +217,31 @@ static int fixed_msr_to_range_index(u32 msr)
return 0;
}

+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_size;
+ return index;
+}
+
static void var_mtrr_range(struct kvm_mtrr_range *range, u64 *start, u64 *end)
{
u64 mask;
--
2.1.0


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