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Subject[PATCH 09/15] KVM: MTRR: introduce var_mtrr_range
Date
It gets the range for the specified variable MTRR

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
---
arch/x86/kvm/mtrr.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c
index 888441e..aeb9767 100644
--- a/arch/x86/kvm/mtrr.c
+++ b/arch/x86/kvm/mtrr.c
@@ -217,10 +217,21 @@ static int fixed_msr_to_range_index(u32 msr)
return 0;
}

+static void var_mtrr_range(struct kvm_mtrr_range *range, u64 *start, u64 *end)
+{
+ u64 mask;
+
+ *start = range->base & PAGE_MASK;
+
+ mask = range->mask & PAGE_MASK;
+ mask |= ~0ULL << boot_cpu_data.x86_phys_bits;
+ *end = ((*start & mask) | ~mask) + 1;
+}
+
static void update_mtrr(struct kvm_vcpu *vcpu, u32 msr)
{
struct kvm_mtrr *mtrr_state = &vcpu->arch.mtrr_state;
- gfn_t start, end, mask;
+ gfn_t start, end;
int index;

if (msr == MSR_IA32_CR_PAT || !tdp_enabled ||
@@ -244,11 +255,7 @@ static void update_mtrr(struct kvm_vcpu *vcpu, u32 msr)
default:
/* variable range MTRRs. */
index = (msr - 0x200) / 2;
- start = mtrr_state->var_ranges[index].base & PAGE_MASK;
- mask = mtrr_state->var_ranges[index].mask & PAGE_MASK;
- mask |= ~0ULL << cpuid_maxphyaddr(vcpu);
-
- end = ((start & mask) | ~mask) + 1;
+ var_mtrr_range(&mtrr_state->var_ranges[index], &start, &end);
}

do_zap:
--
2.1.0


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