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    Subject[PATCH v2 10/15] 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 df73149..cb9702d 100644
    --- a/arch/x86/kvm/mtrr.c
    +++ b/arch/x86/kvm/mtrr.c
    @@ -241,10 +241,21 @@ static int fixed_msr_to_range_index(u32 msr)
    return fixed_mtrr_seg_unit_range_index(seg, unit);
    }

    +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 ||
    @@ -264,11 +275,7 @@ static void update_mtrr(struct kvm_vcpu *vcpu, u32 msr)
    } else {
    /* 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);
    }

    kvm_zap_gfn_range(vcpu->kvm, gpa_to_gfn(start), gpa_to_gfn(end));
    --
    2.1.0


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