KVM: Add local get_mtrr_type() to support MTRR
For EPT memory type support. Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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@ -1393,6 +1393,110 @@ struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva)
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return page;
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}
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/*
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* The function is based on mtrr_type_lookup() in
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* arch/x86/kernel/cpu/mtrr/generic.c
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*/
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static int get_mtrr_type(struct mtrr_state_type *mtrr_state,
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u64 start, u64 end)
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{
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int i;
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u64 base, mask;
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u8 prev_match, curr_match;
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int num_var_ranges = KVM_NR_VAR_MTRR;
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if (!mtrr_state->enabled)
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return 0xFF;
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/* Make end inclusive end, instead of exclusive */
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end--;
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/* Look in fixed ranges. Just return the type as per start */
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if (mtrr_state->have_fixed && (start < 0x100000)) {
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int idx;
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if (start < 0x80000) {
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idx = 0;
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idx += (start >> 16);
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return mtrr_state->fixed_ranges[idx];
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} else if (start < 0xC0000) {
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idx = 1 * 8;
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idx += ((start - 0x80000) >> 14);
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return mtrr_state->fixed_ranges[idx];
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} else if (start < 0x1000000) {
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idx = 3 * 8;
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idx += ((start - 0xC0000) >> 12);
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return mtrr_state->fixed_ranges[idx];
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}
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}
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/*
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* Look in variable ranges
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* Look of multiple ranges matching this address and pick type
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* as per MTRR precedence
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*/
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if (!(mtrr_state->enabled & 2))
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return mtrr_state->def_type;
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prev_match = 0xFF;
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for (i = 0; i < num_var_ranges; ++i) {
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unsigned short start_state, end_state;
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if (!(mtrr_state->var_ranges[i].mask_lo & (1 << 11)))
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continue;
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base = (((u64)mtrr_state->var_ranges[i].base_hi) << 32) +
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(mtrr_state->var_ranges[i].base_lo & PAGE_MASK);
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mask = (((u64)mtrr_state->var_ranges[i].mask_hi) << 32) +
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(mtrr_state->var_ranges[i].mask_lo & PAGE_MASK);
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start_state = ((start & mask) == (base & mask));
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end_state = ((end & mask) == (base & mask));
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if (start_state != end_state)
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return 0xFE;
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if ((start & mask) != (base & mask))
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continue;
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curr_match = mtrr_state->var_ranges[i].base_lo & 0xff;
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if (prev_match == 0xFF) {
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prev_match = curr_match;
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continue;
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}
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if (prev_match == MTRR_TYPE_UNCACHABLE ||
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curr_match == MTRR_TYPE_UNCACHABLE)
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return MTRR_TYPE_UNCACHABLE;
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if ((prev_match == MTRR_TYPE_WRBACK &&
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curr_match == MTRR_TYPE_WRTHROUGH) ||
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(prev_match == MTRR_TYPE_WRTHROUGH &&
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curr_match == MTRR_TYPE_WRBACK)) {
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prev_match = MTRR_TYPE_WRTHROUGH;
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curr_match = MTRR_TYPE_WRTHROUGH;
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}
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if (prev_match != curr_match)
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return MTRR_TYPE_UNCACHABLE;
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}
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if (prev_match != 0xFF)
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return prev_match;
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return mtrr_state->def_type;
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}
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static u8 get_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn)
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{
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u8 mtrr;
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mtrr = get_mtrr_type(&vcpu->arch.mtrr_state, gfn << PAGE_SHIFT,
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(gfn << PAGE_SHIFT) + PAGE_SIZE);
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if (mtrr == 0xfe || mtrr == 0xff)
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mtrr = MTRR_TYPE_WRBACK;
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return mtrr;
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}
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static int kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
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{
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unsigned index;
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