linux-kernel - [PATCH 11/15] KVM: MTRR: introduce fixed_mtrr_addr

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Message-Id: <1432983566-15773-12-git-send-email-guangrong.xiao@linux.intel.com>
Date:	Sat, 30 May 2015 18:59:22 +0800
From:	Xiao Guangrong <guangrong.xiao@...ux.intel.com>
To:	pbonzini@...hat.com
Cc:	gleb@...nel.org, mtosatti@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Subject: [PATCH 11/15] 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@...ux.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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