1330 lines
36 KiB
C
1330 lines
36 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* KVM/MIPS: Deliver/Emulate exceptions to the guest kernel
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*
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* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
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* Authors: Sanjay Lal <sanjayl@kymasys.com>
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*/
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/kvm_host.h>
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#include <linux/log2.h>
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#include <linux/uaccess.h>
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#include <linux/vmalloc.h>
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#include <asm/mmu_context.h>
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#include <asm/pgalloc.h>
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#include "interrupt.h"
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static gpa_t kvm_trap_emul_gva_to_gpa_cb(gva_t gva)
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{
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gpa_t gpa;
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gva_t kseg = KSEGX(gva);
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gva_t gkseg = KVM_GUEST_KSEGX(gva);
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if ((kseg == CKSEG0) || (kseg == CKSEG1))
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gpa = CPHYSADDR(gva);
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else if (gkseg == KVM_GUEST_KSEG0)
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gpa = KVM_GUEST_CPHYSADDR(gva);
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else {
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kvm_err("%s: cannot find GPA for GVA: %#lx\n", __func__, gva);
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kvm_mips_dump_host_tlbs();
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gpa = KVM_INVALID_ADDR;
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}
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kvm_debug("%s: gva %#lx, gpa: %#llx\n", __func__, gva, gpa);
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return gpa;
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}
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static int kvm_trap_emul_no_handler(struct kvm_vcpu *vcpu)
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{
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u32 __user *opc = (u32 __user *) vcpu->arch.pc;
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u32 cause = vcpu->arch.host_cp0_cause;
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u32 exccode = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE;
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unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
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u32 inst = 0;
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/*
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* Fetch the instruction.
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*/
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if (cause & CAUSEF_BD)
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opc += 1;
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kvm_get_badinstr(opc, vcpu, &inst);
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kvm_err("Exception Code: %d not handled @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#x\n",
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exccode, opc, inst, badvaddr,
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kvm_read_c0_guest_status(vcpu->arch.cop0));
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kvm_arch_vcpu_dump_regs(vcpu);
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vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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return RESUME_HOST;
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}
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static int kvm_trap_emul_handle_cop_unusable(struct kvm_vcpu *vcpu)
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{
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struct mips_coproc *cop0 = vcpu->arch.cop0;
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struct kvm_run *run = vcpu->run;
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u32 __user *opc = (u32 __user *) vcpu->arch.pc;
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u32 cause = vcpu->arch.host_cp0_cause;
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enum emulation_result er = EMULATE_DONE;
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int ret = RESUME_GUEST;
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if (((cause & CAUSEF_CE) >> CAUSEB_CE) == 1) {
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/* FPU Unusable */
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if (!kvm_mips_guest_has_fpu(&vcpu->arch) ||
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(kvm_read_c0_guest_status(cop0) & ST0_CU1) == 0) {
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/*
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* Unusable/no FPU in guest:
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* deliver guest COP1 Unusable Exception
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*/
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er = kvm_mips_emulate_fpu_exc(cause, opc, run, vcpu);
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} else {
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/* Restore FPU state */
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kvm_own_fpu(vcpu);
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er = EMULATE_DONE;
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}
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} else {
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er = kvm_mips_emulate_inst(cause, opc, run, vcpu);
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}
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switch (er) {
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case EMULATE_DONE:
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ret = RESUME_GUEST;
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break;
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case EMULATE_FAIL:
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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ret = RESUME_HOST;
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break;
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case EMULATE_WAIT:
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run->exit_reason = KVM_EXIT_INTR;
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ret = RESUME_HOST;
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break;
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case EMULATE_HYPERCALL:
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ret = kvm_mips_handle_hypcall(vcpu);
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break;
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default:
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BUG();
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}
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return ret;
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}
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static int kvm_mips_bad_load(u32 cause, u32 *opc, struct kvm_run *run,
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struct kvm_vcpu *vcpu)
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{
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enum emulation_result er;
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union mips_instruction inst;
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int err;
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/* A code fetch fault doesn't count as an MMIO */
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if (kvm_is_ifetch_fault(&vcpu->arch)) {
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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return RESUME_HOST;
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}
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/* Fetch the instruction. */
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if (cause & CAUSEF_BD)
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opc += 1;
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err = kvm_get_badinstr(opc, vcpu, &inst.word);
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if (err) {
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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return RESUME_HOST;
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}
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/* Emulate the load */
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er = kvm_mips_emulate_load(inst, cause, run, vcpu);
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if (er == EMULATE_FAIL) {
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kvm_err("Emulate load from MMIO space failed\n");
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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} else {
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run->exit_reason = KVM_EXIT_MMIO;
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}
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return RESUME_HOST;
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}
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static int kvm_mips_bad_store(u32 cause, u32 *opc, struct kvm_run *run,
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struct kvm_vcpu *vcpu)
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{
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enum emulation_result er;
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union mips_instruction inst;
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int err;
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/* Fetch the instruction. */
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if (cause & CAUSEF_BD)
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opc += 1;
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err = kvm_get_badinstr(opc, vcpu, &inst.word);
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if (err) {
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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return RESUME_HOST;
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}
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/* Emulate the store */
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er = kvm_mips_emulate_store(inst, cause, run, vcpu);
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if (er == EMULATE_FAIL) {
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kvm_err("Emulate store to MMIO space failed\n");
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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} else {
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run->exit_reason = KVM_EXIT_MMIO;
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}
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return RESUME_HOST;
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}
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static int kvm_mips_bad_access(u32 cause, u32 *opc, struct kvm_run *run,
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struct kvm_vcpu *vcpu, bool store)
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{
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if (store)
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return kvm_mips_bad_store(cause, opc, run, vcpu);
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else
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return kvm_mips_bad_load(cause, opc, run, vcpu);
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}
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static int kvm_trap_emul_handle_tlb_mod(struct kvm_vcpu *vcpu)
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{
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struct mips_coproc *cop0 = vcpu->arch.cop0;
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struct kvm_run *run = vcpu->run;
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u32 __user *opc = (u32 __user *) vcpu->arch.pc;
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unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
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u32 cause = vcpu->arch.host_cp0_cause;
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struct kvm_mips_tlb *tlb;
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unsigned long entryhi;
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int index;
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if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0
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|| KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) {
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/*
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* First find the mapping in the guest TLB. If the failure to
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* write was due to the guest TLB, it should be up to the guest
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* to handle it.
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*/
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entryhi = (badvaddr & VPN2_MASK) |
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(kvm_read_c0_guest_entryhi(cop0) & KVM_ENTRYHI_ASID);
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index = kvm_mips_guest_tlb_lookup(vcpu, entryhi);
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/*
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* These should never happen.
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* They would indicate stale host TLB entries.
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*/
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if (unlikely(index < 0)) {
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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return RESUME_HOST;
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}
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tlb = vcpu->arch.guest_tlb + index;
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if (unlikely(!TLB_IS_VALID(*tlb, badvaddr))) {
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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return RESUME_HOST;
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}
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/*
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* Guest entry not dirty? That would explain the TLB modified
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* exception. Relay that on to the guest so it can handle it.
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*/
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if (!TLB_IS_DIRTY(*tlb, badvaddr)) {
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kvm_mips_emulate_tlbmod(cause, opc, run, vcpu);
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return RESUME_GUEST;
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}
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if (kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, badvaddr,
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true))
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/* Not writable, needs handling as MMIO */
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return kvm_mips_bad_store(cause, opc, run, vcpu);
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return RESUME_GUEST;
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} else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) {
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if (kvm_mips_handle_kseg0_tlb_fault(badvaddr, vcpu, true) < 0)
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/* Not writable, needs handling as MMIO */
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return kvm_mips_bad_store(cause, opc, run, vcpu);
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return RESUME_GUEST;
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} else {
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/* host kernel addresses are all handled as MMIO */
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return kvm_mips_bad_store(cause, opc, run, vcpu);
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}
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}
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static int kvm_trap_emul_handle_tlb_miss(struct kvm_vcpu *vcpu, bool store)
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{
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struct kvm_run *run = vcpu->run;
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u32 __user *opc = (u32 __user *) vcpu->arch.pc;
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unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
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u32 cause = vcpu->arch.host_cp0_cause;
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enum emulation_result er = EMULATE_DONE;
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int ret = RESUME_GUEST;
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if (((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR)
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&& KVM_GUEST_KERNEL_MODE(vcpu)) {
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if (kvm_mips_handle_commpage_tlb_fault(badvaddr, vcpu) < 0) {
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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ret = RESUME_HOST;
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}
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} else if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0
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|| KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) {
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kvm_debug("USER ADDR TLB %s fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
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store ? "ST" : "LD", cause, opc, badvaddr);
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/*
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* User Address (UA) fault, this could happen if
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* (1) TLB entry not present/valid in both Guest and shadow host
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* TLBs, in this case we pass on the fault to the guest
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* kernel and let it handle it.
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* (2) TLB entry is present in the Guest TLB but not in the
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* shadow, in this case we inject the TLB from the Guest TLB
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* into the shadow host TLB
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*/
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er = kvm_mips_handle_tlbmiss(cause, opc, run, vcpu, store);
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if (er == EMULATE_DONE)
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ret = RESUME_GUEST;
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else {
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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ret = RESUME_HOST;
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}
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} else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) {
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/*
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* All KSEG0 faults are handled by KVM, as the guest kernel does
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* not expect to ever get them
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*/
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if (kvm_mips_handle_kseg0_tlb_fault(badvaddr, vcpu, store) < 0)
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ret = kvm_mips_bad_access(cause, opc, run, vcpu, store);
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} else if (KVM_GUEST_KERNEL_MODE(vcpu)
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&& (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1)) {
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/*
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* With EVA we may get a TLB exception instead of an address
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* error when the guest performs MMIO to KSeg1 addresses.
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*/
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ret = kvm_mips_bad_access(cause, opc, run, vcpu, store);
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} else {
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kvm_err("Illegal TLB %s fault address , cause %#x, PC: %p, BadVaddr: %#lx\n",
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store ? "ST" : "LD", cause, opc, badvaddr);
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kvm_mips_dump_host_tlbs();
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kvm_arch_vcpu_dump_regs(vcpu);
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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ret = RESUME_HOST;
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}
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return ret;
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}
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static int kvm_trap_emul_handle_tlb_st_miss(struct kvm_vcpu *vcpu)
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{
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return kvm_trap_emul_handle_tlb_miss(vcpu, true);
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}
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static int kvm_trap_emul_handle_tlb_ld_miss(struct kvm_vcpu *vcpu)
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{
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return kvm_trap_emul_handle_tlb_miss(vcpu, false);
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}
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static int kvm_trap_emul_handle_addr_err_st(struct kvm_vcpu *vcpu)
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{
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struct kvm_run *run = vcpu->run;
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u32 __user *opc = (u32 __user *) vcpu->arch.pc;
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unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
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u32 cause = vcpu->arch.host_cp0_cause;
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int ret = RESUME_GUEST;
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if (KVM_GUEST_KERNEL_MODE(vcpu)
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&& (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1)) {
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ret = kvm_mips_bad_store(cause, opc, run, vcpu);
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} else {
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kvm_err("Address Error (STORE): cause %#x, PC: %p, BadVaddr: %#lx\n",
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cause, opc, badvaddr);
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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ret = RESUME_HOST;
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}
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return ret;
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}
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static int kvm_trap_emul_handle_addr_err_ld(struct kvm_vcpu *vcpu)
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{
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struct kvm_run *run = vcpu->run;
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u32 __user *opc = (u32 __user *) vcpu->arch.pc;
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unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
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u32 cause = vcpu->arch.host_cp0_cause;
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int ret = RESUME_GUEST;
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if (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1) {
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ret = kvm_mips_bad_load(cause, opc, run, vcpu);
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} else {
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kvm_err("Address Error (LOAD): cause %#x, PC: %p, BadVaddr: %#lx\n",
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cause, opc, badvaddr);
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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ret = RESUME_HOST;
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}
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return ret;
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}
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static int kvm_trap_emul_handle_syscall(struct kvm_vcpu *vcpu)
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{
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struct kvm_run *run = vcpu->run;
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u32 __user *opc = (u32 __user *) vcpu->arch.pc;
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u32 cause = vcpu->arch.host_cp0_cause;
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enum emulation_result er = EMULATE_DONE;
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int ret = RESUME_GUEST;
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er = kvm_mips_emulate_syscall(cause, opc, run, vcpu);
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if (er == EMULATE_DONE)
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ret = RESUME_GUEST;
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else {
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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ret = RESUME_HOST;
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}
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return ret;
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}
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static int kvm_trap_emul_handle_res_inst(struct kvm_vcpu *vcpu)
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{
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struct kvm_run *run = vcpu->run;
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u32 __user *opc = (u32 __user *) vcpu->arch.pc;
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u32 cause = vcpu->arch.host_cp0_cause;
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enum emulation_result er = EMULATE_DONE;
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int ret = RESUME_GUEST;
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er = kvm_mips_handle_ri(cause, opc, run, vcpu);
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if (er == EMULATE_DONE)
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ret = RESUME_GUEST;
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else {
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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ret = RESUME_HOST;
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}
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return ret;
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}
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static int kvm_trap_emul_handle_break(struct kvm_vcpu *vcpu)
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{
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struct kvm_run *run = vcpu->run;
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u32 __user *opc = (u32 __user *) vcpu->arch.pc;
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u32 cause = vcpu->arch.host_cp0_cause;
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enum emulation_result er = EMULATE_DONE;
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int ret = RESUME_GUEST;
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er = kvm_mips_emulate_bp_exc(cause, opc, run, vcpu);
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if (er == EMULATE_DONE)
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ret = RESUME_GUEST;
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else {
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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ret = RESUME_HOST;
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}
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return ret;
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}
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static int kvm_trap_emul_handle_trap(struct kvm_vcpu *vcpu)
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{
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struct kvm_run *run = vcpu->run;
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u32 __user *opc = (u32 __user *)vcpu->arch.pc;
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u32 cause = vcpu->arch.host_cp0_cause;
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enum emulation_result er = EMULATE_DONE;
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int ret = RESUME_GUEST;
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er = kvm_mips_emulate_trap_exc(cause, opc, run, vcpu);
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if (er == EMULATE_DONE) {
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ret = RESUME_GUEST;
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} else {
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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ret = RESUME_HOST;
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}
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return ret;
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}
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static int kvm_trap_emul_handle_msa_fpe(struct kvm_vcpu *vcpu)
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{
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struct kvm_run *run = vcpu->run;
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u32 __user *opc = (u32 __user *)vcpu->arch.pc;
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u32 cause = vcpu->arch.host_cp0_cause;
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enum emulation_result er = EMULATE_DONE;
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int ret = RESUME_GUEST;
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er = kvm_mips_emulate_msafpe_exc(cause, opc, run, vcpu);
|
|
if (er == EMULATE_DONE) {
|
|
ret = RESUME_GUEST;
|
|
} else {
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
ret = RESUME_HOST;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int kvm_trap_emul_handle_fpe(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_run *run = vcpu->run;
|
|
u32 __user *opc = (u32 __user *)vcpu->arch.pc;
|
|
u32 cause = vcpu->arch.host_cp0_cause;
|
|
enum emulation_result er = EMULATE_DONE;
|
|
int ret = RESUME_GUEST;
|
|
|
|
er = kvm_mips_emulate_fpe_exc(cause, opc, run, vcpu);
|
|
if (er == EMULATE_DONE) {
|
|
ret = RESUME_GUEST;
|
|
} else {
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
ret = RESUME_HOST;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* kvm_trap_emul_handle_msa_disabled() - Guest used MSA while disabled in root.
|
|
* @vcpu: Virtual CPU context.
|
|
*
|
|
* Handle when the guest attempts to use MSA when it is disabled.
|
|
*/
|
|
static int kvm_trap_emul_handle_msa_disabled(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
struct kvm_run *run = vcpu->run;
|
|
u32 __user *opc = (u32 __user *) vcpu->arch.pc;
|
|
u32 cause = vcpu->arch.host_cp0_cause;
|
|
enum emulation_result er = EMULATE_DONE;
|
|
int ret = RESUME_GUEST;
|
|
|
|
if (!kvm_mips_guest_has_msa(&vcpu->arch) ||
|
|
(kvm_read_c0_guest_status(cop0) & (ST0_CU1 | ST0_FR)) == ST0_CU1) {
|
|
/*
|
|
* No MSA in guest, or FPU enabled and not in FR=1 mode,
|
|
* guest reserved instruction exception
|
|
*/
|
|
er = kvm_mips_emulate_ri_exc(cause, opc, run, vcpu);
|
|
} else if (!(kvm_read_c0_guest_config5(cop0) & MIPS_CONF5_MSAEN)) {
|
|
/* MSA disabled by guest, guest MSA disabled exception */
|
|
er = kvm_mips_emulate_msadis_exc(cause, opc, run, vcpu);
|
|
} else {
|
|
/* Restore MSA/FPU state */
|
|
kvm_own_msa(vcpu);
|
|
er = EMULATE_DONE;
|
|
}
|
|
|
|
switch (er) {
|
|
case EMULATE_DONE:
|
|
ret = RESUME_GUEST;
|
|
break;
|
|
|
|
case EMULATE_FAIL:
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
ret = RESUME_HOST;
|
|
break;
|
|
|
|
default:
|
|
BUG();
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int kvm_trap_emul_hardware_enable(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void kvm_trap_emul_hardware_disable(void)
|
|
{
|
|
}
|
|
|
|
static int kvm_trap_emul_check_extension(struct kvm *kvm, long ext)
|
|
{
|
|
int r;
|
|
|
|
switch (ext) {
|
|
case KVM_CAP_MIPS_TE:
|
|
r = 1;
|
|
break;
|
|
default:
|
|
r = 0;
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int kvm_trap_emul_vcpu_init(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
|
|
struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
|
|
|
|
/*
|
|
* Allocate GVA -> HPA page tables.
|
|
* MIPS doesn't use the mm_struct pointer argument.
|
|
*/
|
|
kern_mm->pgd = pgd_alloc(kern_mm);
|
|
if (!kern_mm->pgd)
|
|
return -ENOMEM;
|
|
|
|
user_mm->pgd = pgd_alloc(user_mm);
|
|
if (!user_mm->pgd) {
|
|
pgd_free(kern_mm, kern_mm->pgd);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void kvm_mips_emul_free_gva_pt(pgd_t *pgd)
|
|
{
|
|
/* Don't free host kernel page tables copied from init_mm.pgd */
|
|
const unsigned long end = 0x80000000;
|
|
unsigned long pgd_va, pud_va, pmd_va;
|
|
pud_t *pud;
|
|
pmd_t *pmd;
|
|
pte_t *pte;
|
|
int i, j, k;
|
|
|
|
for (i = 0; i < USER_PTRS_PER_PGD; i++) {
|
|
if (pgd_none(pgd[i]))
|
|
continue;
|
|
|
|
pgd_va = (unsigned long)i << PGDIR_SHIFT;
|
|
if (pgd_va >= end)
|
|
break;
|
|
pud = pud_offset(pgd + i, 0);
|
|
for (j = 0; j < PTRS_PER_PUD; j++) {
|
|
if (pud_none(pud[j]))
|
|
continue;
|
|
|
|
pud_va = pgd_va | ((unsigned long)j << PUD_SHIFT);
|
|
if (pud_va >= end)
|
|
break;
|
|
pmd = pmd_offset(pud + j, 0);
|
|
for (k = 0; k < PTRS_PER_PMD; k++) {
|
|
if (pmd_none(pmd[k]))
|
|
continue;
|
|
|
|
pmd_va = pud_va | (k << PMD_SHIFT);
|
|
if (pmd_va >= end)
|
|
break;
|
|
pte = pte_offset(pmd + k, 0);
|
|
pte_free_kernel(NULL, pte);
|
|
}
|
|
pmd_free(NULL, pmd);
|
|
}
|
|
pud_free(NULL, pud);
|
|
}
|
|
pgd_free(NULL, pgd);
|
|
}
|
|
|
|
static void kvm_trap_emul_vcpu_uninit(struct kvm_vcpu *vcpu)
|
|
{
|
|
kvm_mips_emul_free_gva_pt(vcpu->arch.guest_kernel_mm.pgd);
|
|
kvm_mips_emul_free_gva_pt(vcpu->arch.guest_user_mm.pgd);
|
|
}
|
|
|
|
static int kvm_trap_emul_vcpu_setup(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
u32 config, config1;
|
|
int vcpu_id = vcpu->vcpu_id;
|
|
|
|
/* Start off the timer at 100 MHz */
|
|
kvm_mips_init_count(vcpu, 100*1000*1000);
|
|
|
|
/*
|
|
* Arch specific stuff, set up config registers properly so that the
|
|
* guest will come up as expected
|
|
*/
|
|
#ifndef CONFIG_CPU_MIPSR6
|
|
/* r2-r5, simulate a MIPS 24kc */
|
|
kvm_write_c0_guest_prid(cop0, 0x00019300);
|
|
#else
|
|
/* r6+, simulate a generic QEMU machine */
|
|
kvm_write_c0_guest_prid(cop0, 0x00010000);
|
|
#endif
|
|
/*
|
|
* Have config1, Cacheable, noncoherent, write-back, write allocate.
|
|
* Endianness, arch revision & virtually tagged icache should match
|
|
* host.
|
|
*/
|
|
config = read_c0_config() & MIPS_CONF_AR;
|
|
config |= MIPS_CONF_M | CONF_CM_CACHABLE_NONCOHERENT | MIPS_CONF_MT_TLB;
|
|
#ifdef CONFIG_CPU_BIG_ENDIAN
|
|
config |= CONF_BE;
|
|
#endif
|
|
if (cpu_has_vtag_icache)
|
|
config |= MIPS_CONF_VI;
|
|
kvm_write_c0_guest_config(cop0, config);
|
|
|
|
/* Read the cache characteristics from the host Config1 Register */
|
|
config1 = (read_c0_config1() & ~0x7f);
|
|
|
|
/* DCache line size not correctly reported in Config1 on Octeon CPUs */
|
|
if (cpu_dcache_line_size()) {
|
|
config1 &= ~MIPS_CONF1_DL;
|
|
config1 |= ((ilog2(cpu_dcache_line_size()) - 1) <<
|
|
MIPS_CONF1_DL_SHF) & MIPS_CONF1_DL;
|
|
}
|
|
|
|
/* Set up MMU size */
|
|
config1 &= ~(0x3f << 25);
|
|
config1 |= ((KVM_MIPS_GUEST_TLB_SIZE - 1) << 25);
|
|
|
|
/* We unset some bits that we aren't emulating */
|
|
config1 &= ~(MIPS_CONF1_C2 | MIPS_CONF1_MD | MIPS_CONF1_PC |
|
|
MIPS_CONF1_WR | MIPS_CONF1_CA);
|
|
kvm_write_c0_guest_config1(cop0, config1);
|
|
|
|
/* Have config3, no tertiary/secondary caches implemented */
|
|
kvm_write_c0_guest_config2(cop0, MIPS_CONF_M);
|
|
/* MIPS_CONF_M | (read_c0_config2() & 0xfff) */
|
|
|
|
/* Have config4, UserLocal */
|
|
kvm_write_c0_guest_config3(cop0, MIPS_CONF_M | MIPS_CONF3_ULRI);
|
|
|
|
/* Have config5 */
|
|
kvm_write_c0_guest_config4(cop0, MIPS_CONF_M);
|
|
|
|
/* No config6 */
|
|
kvm_write_c0_guest_config5(cop0, 0);
|
|
|
|
/* Set Wait IE/IXMT Ignore in Config7, IAR, AR */
|
|
kvm_write_c0_guest_config7(cop0, (MIPS_CONF7_WII) | (1 << 10));
|
|
|
|
/* Status */
|
|
kvm_write_c0_guest_status(cop0, ST0_BEV | ST0_ERL);
|
|
|
|
/*
|
|
* Setup IntCtl defaults, compatibility mode for timer interrupts (HW5)
|
|
*/
|
|
kvm_write_c0_guest_intctl(cop0, 0xFC000000);
|
|
|
|
/* Put in vcpu id as CPUNum into Ebase Reg to handle SMP Guests */
|
|
kvm_write_c0_guest_ebase(cop0, KVM_GUEST_KSEG0 |
|
|
(vcpu_id & MIPS_EBASE_CPUNUM));
|
|
|
|
/* Put PC at guest reset vector */
|
|
vcpu->arch.pc = KVM_GUEST_CKSEG1ADDR(0x1fc00000);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void kvm_trap_emul_flush_shadow_all(struct kvm *kvm)
|
|
{
|
|
/* Flush GVA page tables and invalidate GVA ASIDs on all VCPUs */
|
|
kvm_flush_remote_tlbs(kvm);
|
|
}
|
|
|
|
static void kvm_trap_emul_flush_shadow_memslot(struct kvm *kvm,
|
|
const struct kvm_memory_slot *slot)
|
|
{
|
|
kvm_trap_emul_flush_shadow_all(kvm);
|
|
}
|
|
|
|
static u64 kvm_trap_emul_get_one_regs[] = {
|
|
KVM_REG_MIPS_CP0_INDEX,
|
|
KVM_REG_MIPS_CP0_ENTRYLO0,
|
|
KVM_REG_MIPS_CP0_ENTRYLO1,
|
|
KVM_REG_MIPS_CP0_CONTEXT,
|
|
KVM_REG_MIPS_CP0_USERLOCAL,
|
|
KVM_REG_MIPS_CP0_PAGEMASK,
|
|
KVM_REG_MIPS_CP0_WIRED,
|
|
KVM_REG_MIPS_CP0_HWRENA,
|
|
KVM_REG_MIPS_CP0_BADVADDR,
|
|
KVM_REG_MIPS_CP0_COUNT,
|
|
KVM_REG_MIPS_CP0_ENTRYHI,
|
|
KVM_REG_MIPS_CP0_COMPARE,
|
|
KVM_REG_MIPS_CP0_STATUS,
|
|
KVM_REG_MIPS_CP0_INTCTL,
|
|
KVM_REG_MIPS_CP0_CAUSE,
|
|
KVM_REG_MIPS_CP0_EPC,
|
|
KVM_REG_MIPS_CP0_PRID,
|
|
KVM_REG_MIPS_CP0_EBASE,
|
|
KVM_REG_MIPS_CP0_CONFIG,
|
|
KVM_REG_MIPS_CP0_CONFIG1,
|
|
KVM_REG_MIPS_CP0_CONFIG2,
|
|
KVM_REG_MIPS_CP0_CONFIG3,
|
|
KVM_REG_MIPS_CP0_CONFIG4,
|
|
KVM_REG_MIPS_CP0_CONFIG5,
|
|
KVM_REG_MIPS_CP0_CONFIG7,
|
|
KVM_REG_MIPS_CP0_ERROREPC,
|
|
KVM_REG_MIPS_CP0_KSCRATCH1,
|
|
KVM_REG_MIPS_CP0_KSCRATCH2,
|
|
KVM_REG_MIPS_CP0_KSCRATCH3,
|
|
KVM_REG_MIPS_CP0_KSCRATCH4,
|
|
KVM_REG_MIPS_CP0_KSCRATCH5,
|
|
KVM_REG_MIPS_CP0_KSCRATCH6,
|
|
|
|
KVM_REG_MIPS_COUNT_CTL,
|
|
KVM_REG_MIPS_COUNT_RESUME,
|
|
KVM_REG_MIPS_COUNT_HZ,
|
|
};
|
|
|
|
static unsigned long kvm_trap_emul_num_regs(struct kvm_vcpu *vcpu)
|
|
{
|
|
return ARRAY_SIZE(kvm_trap_emul_get_one_regs);
|
|
}
|
|
|
|
static int kvm_trap_emul_copy_reg_indices(struct kvm_vcpu *vcpu,
|
|
u64 __user *indices)
|
|
{
|
|
if (copy_to_user(indices, kvm_trap_emul_get_one_regs,
|
|
sizeof(kvm_trap_emul_get_one_regs)))
|
|
return -EFAULT;
|
|
indices += ARRAY_SIZE(kvm_trap_emul_get_one_regs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_trap_emul_get_one_reg(struct kvm_vcpu *vcpu,
|
|
const struct kvm_one_reg *reg,
|
|
s64 *v)
|
|
{
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
|
|
switch (reg->id) {
|
|
case KVM_REG_MIPS_CP0_INDEX:
|
|
*v = (long)kvm_read_c0_guest_index(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_ENTRYLO0:
|
|
*v = kvm_read_c0_guest_entrylo0(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_ENTRYLO1:
|
|
*v = kvm_read_c0_guest_entrylo1(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONTEXT:
|
|
*v = (long)kvm_read_c0_guest_context(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_USERLOCAL:
|
|
*v = (long)kvm_read_c0_guest_userlocal(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PAGEMASK:
|
|
*v = (long)kvm_read_c0_guest_pagemask(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_WIRED:
|
|
*v = (long)kvm_read_c0_guest_wired(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_HWRENA:
|
|
*v = (long)kvm_read_c0_guest_hwrena(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_BADVADDR:
|
|
*v = (long)kvm_read_c0_guest_badvaddr(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_ENTRYHI:
|
|
*v = (long)kvm_read_c0_guest_entryhi(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_COMPARE:
|
|
*v = (long)kvm_read_c0_guest_compare(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_STATUS:
|
|
*v = (long)kvm_read_c0_guest_status(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_INTCTL:
|
|
*v = (long)kvm_read_c0_guest_intctl(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CAUSE:
|
|
*v = (long)kvm_read_c0_guest_cause(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_EPC:
|
|
*v = (long)kvm_read_c0_guest_epc(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PRID:
|
|
*v = (long)kvm_read_c0_guest_prid(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_EBASE:
|
|
*v = (long)kvm_read_c0_guest_ebase(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG:
|
|
*v = (long)kvm_read_c0_guest_config(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG1:
|
|
*v = (long)kvm_read_c0_guest_config1(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG2:
|
|
*v = (long)kvm_read_c0_guest_config2(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG3:
|
|
*v = (long)kvm_read_c0_guest_config3(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG4:
|
|
*v = (long)kvm_read_c0_guest_config4(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG5:
|
|
*v = (long)kvm_read_c0_guest_config5(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG7:
|
|
*v = (long)kvm_read_c0_guest_config7(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_COUNT:
|
|
*v = kvm_mips_read_count(vcpu);
|
|
break;
|
|
case KVM_REG_MIPS_COUNT_CTL:
|
|
*v = vcpu->arch.count_ctl;
|
|
break;
|
|
case KVM_REG_MIPS_COUNT_RESUME:
|
|
*v = ktime_to_ns(vcpu->arch.count_resume);
|
|
break;
|
|
case KVM_REG_MIPS_COUNT_HZ:
|
|
*v = vcpu->arch.count_hz;
|
|
break;
|
|
case KVM_REG_MIPS_CP0_ERROREPC:
|
|
*v = (long)kvm_read_c0_guest_errorepc(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_KSCRATCH1:
|
|
*v = (long)kvm_read_c0_guest_kscratch1(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_KSCRATCH2:
|
|
*v = (long)kvm_read_c0_guest_kscratch2(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_KSCRATCH3:
|
|
*v = (long)kvm_read_c0_guest_kscratch3(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_KSCRATCH4:
|
|
*v = (long)kvm_read_c0_guest_kscratch4(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_KSCRATCH5:
|
|
*v = (long)kvm_read_c0_guest_kscratch5(cop0);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_KSCRATCH6:
|
|
*v = (long)kvm_read_c0_guest_kscratch6(cop0);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_trap_emul_set_one_reg(struct kvm_vcpu *vcpu,
|
|
const struct kvm_one_reg *reg,
|
|
s64 v)
|
|
{
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
int ret = 0;
|
|
unsigned int cur, change;
|
|
|
|
switch (reg->id) {
|
|
case KVM_REG_MIPS_CP0_INDEX:
|
|
kvm_write_c0_guest_index(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_ENTRYLO0:
|
|
kvm_write_c0_guest_entrylo0(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_ENTRYLO1:
|
|
kvm_write_c0_guest_entrylo1(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONTEXT:
|
|
kvm_write_c0_guest_context(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_USERLOCAL:
|
|
kvm_write_c0_guest_userlocal(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PAGEMASK:
|
|
kvm_write_c0_guest_pagemask(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_WIRED:
|
|
kvm_write_c0_guest_wired(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_HWRENA:
|
|
kvm_write_c0_guest_hwrena(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_BADVADDR:
|
|
kvm_write_c0_guest_badvaddr(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_ENTRYHI:
|
|
kvm_write_c0_guest_entryhi(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_STATUS:
|
|
kvm_write_c0_guest_status(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_INTCTL:
|
|
/* No VInt, so no VS, read-only for now */
|
|
break;
|
|
case KVM_REG_MIPS_CP0_EPC:
|
|
kvm_write_c0_guest_epc(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PRID:
|
|
kvm_write_c0_guest_prid(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_EBASE:
|
|
/*
|
|
* Allow core number to be written, but the exception base must
|
|
* remain in guest KSeg0.
|
|
*/
|
|
kvm_change_c0_guest_ebase(cop0, 0x1ffff000 | MIPS_EBASE_CPUNUM,
|
|
v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_COUNT:
|
|
kvm_mips_write_count(vcpu, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_COMPARE:
|
|
kvm_mips_write_compare(vcpu, v, false);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CAUSE:
|
|
/*
|
|
* If the timer is stopped or started (DC bit) it must look
|
|
* atomic with changes to the interrupt pending bits (TI, IRQ5).
|
|
* A timer interrupt should not happen in between.
|
|
*/
|
|
if ((kvm_read_c0_guest_cause(cop0) ^ v) & CAUSEF_DC) {
|
|
if (v & CAUSEF_DC) {
|
|
/* disable timer first */
|
|
kvm_mips_count_disable_cause(vcpu);
|
|
kvm_change_c0_guest_cause(cop0, (u32)~CAUSEF_DC,
|
|
v);
|
|
} else {
|
|
/* enable timer last */
|
|
kvm_change_c0_guest_cause(cop0, (u32)~CAUSEF_DC,
|
|
v);
|
|
kvm_mips_count_enable_cause(vcpu);
|
|
}
|
|
} else {
|
|
kvm_write_c0_guest_cause(cop0, v);
|
|
}
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG:
|
|
/* read-only for now */
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG1:
|
|
cur = kvm_read_c0_guest_config1(cop0);
|
|
change = (cur ^ v) & kvm_mips_config1_wrmask(vcpu);
|
|
if (change) {
|
|
v = cur ^ change;
|
|
kvm_write_c0_guest_config1(cop0, v);
|
|
}
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG2:
|
|
/* read-only for now */
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG3:
|
|
cur = kvm_read_c0_guest_config3(cop0);
|
|
change = (cur ^ v) & kvm_mips_config3_wrmask(vcpu);
|
|
if (change) {
|
|
v = cur ^ change;
|
|
kvm_write_c0_guest_config3(cop0, v);
|
|
}
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG4:
|
|
cur = kvm_read_c0_guest_config4(cop0);
|
|
change = (cur ^ v) & kvm_mips_config4_wrmask(vcpu);
|
|
if (change) {
|
|
v = cur ^ change;
|
|
kvm_write_c0_guest_config4(cop0, v);
|
|
}
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG5:
|
|
cur = kvm_read_c0_guest_config5(cop0);
|
|
change = (cur ^ v) & kvm_mips_config5_wrmask(vcpu);
|
|
if (change) {
|
|
v = cur ^ change;
|
|
kvm_write_c0_guest_config5(cop0, v);
|
|
}
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG7:
|
|
/* writes ignored */
|
|
break;
|
|
case KVM_REG_MIPS_COUNT_CTL:
|
|
ret = kvm_mips_set_count_ctl(vcpu, v);
|
|
break;
|
|
case KVM_REG_MIPS_COUNT_RESUME:
|
|
ret = kvm_mips_set_count_resume(vcpu, v);
|
|
break;
|
|
case KVM_REG_MIPS_COUNT_HZ:
|
|
ret = kvm_mips_set_count_hz(vcpu, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_ERROREPC:
|
|
kvm_write_c0_guest_errorepc(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_KSCRATCH1:
|
|
kvm_write_c0_guest_kscratch1(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_KSCRATCH2:
|
|
kvm_write_c0_guest_kscratch2(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_KSCRATCH3:
|
|
kvm_write_c0_guest_kscratch3(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_KSCRATCH4:
|
|
kvm_write_c0_guest_kscratch4(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_KSCRATCH5:
|
|
kvm_write_c0_guest_kscratch5(cop0, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_KSCRATCH6:
|
|
kvm_write_c0_guest_kscratch6(cop0, v);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int kvm_trap_emul_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
|
|
{
|
|
struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
|
|
struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
|
|
struct mm_struct *mm;
|
|
|
|
/*
|
|
* Were we in guest context? If so, restore the appropriate ASID based
|
|
* on the mode of the Guest (Kernel/User).
|
|
*/
|
|
if (current->flags & PF_VCPU) {
|
|
mm = KVM_GUEST_KERNEL_MODE(vcpu) ? kern_mm : user_mm;
|
|
if ((cpu_context(cpu, mm) ^ asid_cache(cpu)) &
|
|
asid_version_mask(cpu))
|
|
get_new_mmu_context(mm, cpu);
|
|
write_c0_entryhi(cpu_asid(cpu, mm));
|
|
TLBMISS_HANDLER_SETUP_PGD(mm->pgd);
|
|
kvm_mips_suspend_mm(cpu);
|
|
ehb();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_trap_emul_vcpu_put(struct kvm_vcpu *vcpu, int cpu)
|
|
{
|
|
kvm_lose_fpu(vcpu);
|
|
|
|
if (current->flags & PF_VCPU) {
|
|
/* Restore normal Linux process memory map */
|
|
if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) &
|
|
asid_version_mask(cpu)))
|
|
get_new_mmu_context(current->mm, cpu);
|
|
write_c0_entryhi(cpu_asid(cpu, current->mm));
|
|
TLBMISS_HANDLER_SETUP_PGD(current->mm->pgd);
|
|
kvm_mips_resume_mm(cpu);
|
|
ehb();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void kvm_trap_emul_check_requests(struct kvm_vcpu *vcpu, int cpu,
|
|
bool reload_asid)
|
|
{
|
|
struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
|
|
struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
|
|
struct mm_struct *mm;
|
|
int i;
|
|
|
|
if (likely(!kvm_request_pending(vcpu)))
|
|
return;
|
|
|
|
if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
|
|
/*
|
|
* Both kernel & user GVA mappings must be invalidated. The
|
|
* caller is just about to check whether the ASID is stale
|
|
* anyway so no need to reload it here.
|
|
*/
|
|
kvm_mips_flush_gva_pt(kern_mm->pgd, KMF_GPA | KMF_KERN);
|
|
kvm_mips_flush_gva_pt(user_mm->pgd, KMF_GPA | KMF_USER);
|
|
for_each_possible_cpu(i) {
|
|
cpu_context(i, kern_mm) = 0;
|
|
cpu_context(i, user_mm) = 0;
|
|
}
|
|
|
|
/* Generate new ASID for current mode */
|
|
if (reload_asid) {
|
|
mm = KVM_GUEST_KERNEL_MODE(vcpu) ? kern_mm : user_mm;
|
|
get_new_mmu_context(mm, cpu);
|
|
htw_stop();
|
|
write_c0_entryhi(cpu_asid(cpu, mm));
|
|
TLBMISS_HANDLER_SETUP_PGD(mm->pgd);
|
|
htw_start();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* kvm_trap_emul_gva_lockless_begin() - Begin lockless access to GVA space.
|
|
* @vcpu: VCPU pointer.
|
|
*
|
|
* Call before a GVA space access outside of guest mode, to ensure that
|
|
* asynchronous TLB flush requests are handled or delayed until completion of
|
|
* the GVA access (as indicated by a matching kvm_trap_emul_gva_lockless_end()).
|
|
*
|
|
* Should be called with IRQs already enabled.
|
|
*/
|
|
void kvm_trap_emul_gva_lockless_begin(struct kvm_vcpu *vcpu)
|
|
{
|
|
/* We re-enable IRQs in kvm_trap_emul_gva_lockless_end() */
|
|
WARN_ON_ONCE(irqs_disabled());
|
|
|
|
/*
|
|
* The caller is about to access the GVA space, so we set the mode to
|
|
* force TLB flush requests to send an IPI, and also disable IRQs to
|
|
* delay IPI handling until kvm_trap_emul_gva_lockless_end().
|
|
*/
|
|
local_irq_disable();
|
|
|
|
/*
|
|
* Make sure the read of VCPU requests is not reordered ahead of the
|
|
* write to vcpu->mode, or we could miss a TLB flush request while
|
|
* the requester sees the VCPU as outside of guest mode and not needing
|
|
* an IPI.
|
|
*/
|
|
smp_store_mb(vcpu->mode, READING_SHADOW_PAGE_TABLES);
|
|
|
|
/*
|
|
* If a TLB flush has been requested (potentially while
|
|
* OUTSIDE_GUEST_MODE and assumed immediately effective), perform it
|
|
* before accessing the GVA space, and be sure to reload the ASID if
|
|
* necessary as it'll be immediately used.
|
|
*
|
|
* TLB flush requests after this check will trigger an IPI due to the
|
|
* mode change above, which will be delayed due to IRQs disabled.
|
|
*/
|
|
kvm_trap_emul_check_requests(vcpu, smp_processor_id(), true);
|
|
}
|
|
|
|
/**
|
|
* kvm_trap_emul_gva_lockless_end() - End lockless access to GVA space.
|
|
* @vcpu: VCPU pointer.
|
|
*
|
|
* Called after a GVA space access outside of guest mode. Should have a matching
|
|
* call to kvm_trap_emul_gva_lockless_begin().
|
|
*/
|
|
void kvm_trap_emul_gva_lockless_end(struct kvm_vcpu *vcpu)
|
|
{
|
|
/*
|
|
* Make sure the write to vcpu->mode is not reordered in front of GVA
|
|
* accesses, or a TLB flush requester may not think it necessary to send
|
|
* an IPI.
|
|
*/
|
|
smp_store_release(&vcpu->mode, OUTSIDE_GUEST_MODE);
|
|
|
|
/*
|
|
* Now that the access to GVA space is complete, its safe for pending
|
|
* TLB flush request IPIs to be handled (which indicates completion).
|
|
*/
|
|
local_irq_enable();
|
|
}
|
|
|
|
static void kvm_trap_emul_vcpu_reenter(struct kvm_run *run,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
|
|
struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
|
|
struct mm_struct *mm;
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
int i, cpu = smp_processor_id();
|
|
unsigned int gasid;
|
|
|
|
/*
|
|
* No need to reload ASID, IRQs are disabled already so there's no rush,
|
|
* and we'll check if we need to regenerate below anyway before
|
|
* re-entering the guest.
|
|
*/
|
|
kvm_trap_emul_check_requests(vcpu, cpu, false);
|
|
|
|
if (KVM_GUEST_KERNEL_MODE(vcpu)) {
|
|
mm = kern_mm;
|
|
} else {
|
|
mm = user_mm;
|
|
|
|
/*
|
|
* Lazy host ASID regeneration / PT flush for guest user mode.
|
|
* If the guest ASID has changed since the last guest usermode
|
|
* execution, invalidate the stale TLB entries and flush GVA PT
|
|
* entries too.
|
|
*/
|
|
gasid = kvm_read_c0_guest_entryhi(cop0) & KVM_ENTRYHI_ASID;
|
|
if (gasid != vcpu->arch.last_user_gasid) {
|
|
kvm_mips_flush_gva_pt(user_mm->pgd, KMF_USER);
|
|
for_each_possible_cpu(i)
|
|
cpu_context(i, user_mm) = 0;
|
|
vcpu->arch.last_user_gasid = gasid;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check if ASID is stale. This may happen due to a TLB flush request or
|
|
* a lazy user MM invalidation.
|
|
*/
|
|
if ((cpu_context(cpu, mm) ^ asid_cache(cpu)) &
|
|
asid_version_mask(cpu))
|
|
get_new_mmu_context(mm, cpu);
|
|
}
|
|
|
|
static int kvm_trap_emul_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
int r;
|
|
|
|
/* Check if we have any exceptions/interrupts pending */
|
|
kvm_mips_deliver_interrupts(vcpu,
|
|
kvm_read_c0_guest_cause(vcpu->arch.cop0));
|
|
|
|
kvm_trap_emul_vcpu_reenter(run, vcpu);
|
|
|
|
/*
|
|
* We use user accessors to access guest memory, but we don't want to
|
|
* invoke Linux page faulting.
|
|
*/
|
|
pagefault_disable();
|
|
|
|
/* Disable hardware page table walking while in guest */
|
|
htw_stop();
|
|
|
|
/*
|
|
* While in guest context we're in the guest's address space, not the
|
|
* host process address space, so we need to be careful not to confuse
|
|
* e.g. cache management IPIs.
|
|
*/
|
|
kvm_mips_suspend_mm(cpu);
|
|
|
|
r = vcpu->arch.vcpu_run(run, vcpu);
|
|
|
|
/* We may have migrated while handling guest exits */
|
|
cpu = smp_processor_id();
|
|
|
|
/* Restore normal Linux process memory map */
|
|
if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) &
|
|
asid_version_mask(cpu)))
|
|
get_new_mmu_context(current->mm, cpu);
|
|
write_c0_entryhi(cpu_asid(cpu, current->mm));
|
|
TLBMISS_HANDLER_SETUP_PGD(current->mm->pgd);
|
|
kvm_mips_resume_mm(cpu);
|
|
|
|
htw_start();
|
|
|
|
pagefault_enable();
|
|
|
|
return r;
|
|
}
|
|
|
|
static struct kvm_mips_callbacks kvm_trap_emul_callbacks = {
|
|
/* exit handlers */
|
|
.handle_cop_unusable = kvm_trap_emul_handle_cop_unusable,
|
|
.handle_tlb_mod = kvm_trap_emul_handle_tlb_mod,
|
|
.handle_tlb_st_miss = kvm_trap_emul_handle_tlb_st_miss,
|
|
.handle_tlb_ld_miss = kvm_trap_emul_handle_tlb_ld_miss,
|
|
.handle_addr_err_st = kvm_trap_emul_handle_addr_err_st,
|
|
.handle_addr_err_ld = kvm_trap_emul_handle_addr_err_ld,
|
|
.handle_syscall = kvm_trap_emul_handle_syscall,
|
|
.handle_res_inst = kvm_trap_emul_handle_res_inst,
|
|
.handle_break = kvm_trap_emul_handle_break,
|
|
.handle_trap = kvm_trap_emul_handle_trap,
|
|
.handle_msa_fpe = kvm_trap_emul_handle_msa_fpe,
|
|
.handle_fpe = kvm_trap_emul_handle_fpe,
|
|
.handle_msa_disabled = kvm_trap_emul_handle_msa_disabled,
|
|
.handle_guest_exit = kvm_trap_emul_no_handler,
|
|
|
|
.hardware_enable = kvm_trap_emul_hardware_enable,
|
|
.hardware_disable = kvm_trap_emul_hardware_disable,
|
|
.check_extension = kvm_trap_emul_check_extension,
|
|
.vcpu_init = kvm_trap_emul_vcpu_init,
|
|
.vcpu_uninit = kvm_trap_emul_vcpu_uninit,
|
|
.vcpu_setup = kvm_trap_emul_vcpu_setup,
|
|
.flush_shadow_all = kvm_trap_emul_flush_shadow_all,
|
|
.flush_shadow_memslot = kvm_trap_emul_flush_shadow_memslot,
|
|
.gva_to_gpa = kvm_trap_emul_gva_to_gpa_cb,
|
|
.queue_timer_int = kvm_mips_queue_timer_int_cb,
|
|
.dequeue_timer_int = kvm_mips_dequeue_timer_int_cb,
|
|
.queue_io_int = kvm_mips_queue_io_int_cb,
|
|
.dequeue_io_int = kvm_mips_dequeue_io_int_cb,
|
|
.irq_deliver = kvm_mips_irq_deliver_cb,
|
|
.irq_clear = kvm_mips_irq_clear_cb,
|
|
.num_regs = kvm_trap_emul_num_regs,
|
|
.copy_reg_indices = kvm_trap_emul_copy_reg_indices,
|
|
.get_one_reg = kvm_trap_emul_get_one_reg,
|
|
.set_one_reg = kvm_trap_emul_set_one_reg,
|
|
.vcpu_load = kvm_trap_emul_vcpu_load,
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.vcpu_put = kvm_trap_emul_vcpu_put,
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.vcpu_run = kvm_trap_emul_vcpu_run,
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.vcpu_reenter = kvm_trap_emul_vcpu_reenter,
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|
};
|
|
|
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int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks)
|
|
{
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*install_callbacks = &kvm_trap_emul_callbacks;
|
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return 0;
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}
|