-static int tlbe_is_host_safe(const struct kvm_vcpu *vcpu,
- const struct tlbe *tlbe)
-{
- gpa_t gpa;
-
- if (!get_tlb_v(tlbe))
- return 0;
-
- /* Does it match current guest AS? */
- /* XXX what about IS != DS? */
- if (get_tlb_ts(tlbe) != !!(vcpu->arch.msr & MSR_IS))
- return 0;
-
- gpa = get_tlb_raddr(tlbe);
- if (!gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT))
- /* Mapping is not for RAM. */
- return 0;
-
- return 1;
-}
-
-static int kvmppc_emul_tlbwe(struct kvm_vcpu *vcpu, u32 inst)
-{
- u64 eaddr;
- u64 raddr;
- u64 asid;
- u32 flags;
- struct tlbe *tlbe;
- unsigned int ra;
- unsigned int rs;
- unsigned int ws;
- unsigned int index;
-
- ra = get_ra(inst);
- rs = get_rs(inst);
- ws = get_ws(inst);
-
- index = vcpu->arch.gpr[ra];
- if (index > PPC44x_TLB_SIZE) {
- printk("%s: index %d\n", __func__, index);
- kvmppc_dump_vcpu(vcpu);
- return EMULATE_FAIL;
- }
-
- tlbe = &vcpu->arch.guest_tlb[index];
-
- /* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */
- if (tlbe->word0 & PPC44x_TLB_VALID) {
- eaddr = get_tlb_eaddr(tlbe);
- asid = (tlbe->word0 & PPC44x_TLB_TS) | tlbe->tid;
- kvmppc_mmu_invalidate(vcpu, eaddr, get_tlb_end(tlbe), asid);
- }
-
- switch (ws) {
- case PPC44x_TLB_PAGEID:
- tlbe->tid = vcpu->arch.mmucr & 0xff;
- tlbe->word0 = vcpu->arch.gpr[rs];
- break;
-
- case PPC44x_TLB_XLAT:
- tlbe->word1 = vcpu->arch.gpr[rs];
- break;
-
- case PPC44x_TLB_ATTRIB:
- tlbe->word2 = vcpu->arch.gpr[rs];
- break;
-
- default:
- return EMULATE_FAIL;
- }
-
- if (tlbe_is_host_safe(vcpu, tlbe)) {
- eaddr = get_tlb_eaddr(tlbe);
- raddr = get_tlb_raddr(tlbe);
- asid = (tlbe->word0 & PPC44x_TLB_TS) | tlbe->tid;
- flags = tlbe->word2 & 0xffff;
-
- /* Create a 4KB mapping on the host. If the guest wanted a
- * large page, only the first 4KB is mapped here and the rest
- * are mapped on the fly. */
- kvmppc_mmu_map(vcpu, eaddr, raddr >> PAGE_SHIFT, asid, flags);
- }
-
- KVMTRACE_5D(GTLB_WRITE, vcpu, index,
- tlbe->tid, tlbe->word0, tlbe->word1, tlbe->word2,
- handler);
-
- return EMULATE_DONE;
-}
-