mirror of https://gitee.com/openkylin/linux.git
KVM: MTRR: sort variable MTRRs
Sort all valid variable MTRRs based on its base address, it will help us to check a range to see if it's fully contained in variable MTRRs Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> [Fix list insertion sort, simplify var_mtrr_range_is_valid to just test the V bit. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -345,12 +345,15 @@ enum {
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struct kvm_mtrr_range {
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u64 base;
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u64 mask;
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struct list_head node;
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};
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struct kvm_mtrr {
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struct kvm_mtrr_range var_ranges[KVM_NR_VAR_MTRR];
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mtrr_type fixed_ranges[KVM_NR_FIXED_MTRR_REGION];
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u64 deftype;
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struct list_head head;
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};
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struct kvm_vcpu_arch {
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@ -285,6 +285,39 @@ static void update_mtrr(struct kvm_vcpu *vcpu, u32 msr)
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kvm_zap_gfn_range(vcpu->kvm, gpa_to_gfn(start), gpa_to_gfn(end));
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}
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static bool var_mtrr_range_is_valid(struct kvm_mtrr_range *range)
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{
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return (range->mask & (1 << 11)) != 0;
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}
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static void set_var_mtrr_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
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{
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struct kvm_mtrr *mtrr_state = &vcpu->arch.mtrr_state;
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struct kvm_mtrr_range *tmp, *cur;
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int index, is_mtrr_mask;
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index = (msr - 0x200) / 2;
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is_mtrr_mask = msr - 0x200 - 2 * index;
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cur = &mtrr_state->var_ranges[index];
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/* remove the entry if it's in the list. */
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if (var_mtrr_range_is_valid(cur))
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list_del(&mtrr_state->var_ranges[index].node);
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if (!is_mtrr_mask)
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cur->base = data;
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else
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cur->mask = data;
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/* add it to the list if it's enabled. */
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if (var_mtrr_range_is_valid(cur)) {
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list_for_each_entry(tmp, &mtrr_state->head, node)
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if (cur->base >= tmp->base)
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break;
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list_add_tail(&cur->node, &tmp->node);
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}
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}
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int kvm_mtrr_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
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{
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int index;
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@ -299,16 +332,8 @@ int kvm_mtrr_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
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vcpu->arch.mtrr_state.deftype = data;
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else if (msr == MSR_IA32_CR_PAT)
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vcpu->arch.pat = data;
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else { /* Variable MTRRs */
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int is_mtrr_mask;
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index = (msr - 0x200) / 2;
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is_mtrr_mask = msr - 0x200 - 2 * index;
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if (!is_mtrr_mask)
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vcpu->arch.mtrr_state.var_ranges[index].base = data;
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else
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vcpu->arch.mtrr_state.var_ranges[index].mask = data;
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}
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else
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set_var_mtrr_msr(vcpu, msr, data);
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update_mtrr(vcpu, msr);
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return 0;
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@ -354,6 +379,11 @@ int kvm_mtrr_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
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return 0;
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}
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void kvm_vcpu_mtrr_init(struct kvm_vcpu *vcpu)
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{
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INIT_LIST_HEAD(&vcpu->arch.mtrr_state.head);
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}
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u8 kvm_mtrr_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn)
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{
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struct kvm_mtrr *mtrr_state = &vcpu->arch.mtrr_state;
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@ -7379,13 +7379,13 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
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{
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int r;
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kvm_vcpu_mtrr_init(vcpu);
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r = vcpu_load(vcpu);
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if (r)
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return r;
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kvm_vcpu_reset(vcpu, false);
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kvm_mmu_setup(vcpu);
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vcpu_put(vcpu);
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return r;
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}
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@ -162,6 +162,7 @@ int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt,
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gva_t addr, void *val, unsigned int bytes,
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struct x86_exception *exception);
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void kvm_vcpu_mtrr_init(struct kvm_vcpu *vcpu);
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u8 kvm_mtrr_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn);
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bool kvm_mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data);
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int kvm_mtrr_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data);
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