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    Subject[PATCH v3 23/29] LoongArch: KVM: Implement handle gspr exception
    Date
    Implement kvm handle gspr exception interface, including emulate the
    reading and writing of cpucfg, csr, iocsr resource.

    Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
    ---
    arch/loongarch/kvm/exit.c | 115 ++++++++++++++++++++++++++++++++++++++
    1 file changed, 115 insertions(+)

    diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
    index f0de0b638f31..97b90b04d641 100644
    --- a/arch/loongarch/kvm/exit.c
    +++ b/arch/loongarch/kvm/exit.c
    @@ -203,3 +203,118 @@ int _kvm_emu_idle(struct kvm_vcpu *vcpu)

    return EMULATE_DONE;
    }
    +
    +static int _kvm_trap_handle_gspr(struct kvm_vcpu *vcpu)
    +{
    + enum emulation_result er = EMULATE_DONE;
    + struct kvm_run *run = vcpu->run;
    + larch_inst inst;
    + unsigned long curr_pc;
    + int rd, rj;
    + unsigned int index;
    +
    + /*
    + * Fetch the instruction.
    + */
    + inst.word = vcpu->arch.badi;
    + curr_pc = vcpu->arch.pc;
    + update_pc(&vcpu->arch);
    +
    + trace_kvm_exit_gspr(vcpu, inst.word);
    + er = EMULATE_FAIL;
    + switch (((inst.word >> 24) & 0xff)) {
    + case 0x0:
    + /* cpucfg GSPR */
    + if (inst.reg2_format.opcode == 0x1B) {
    + rd = inst.reg2_format.rd;
    + rj = inst.reg2_format.rj;
    + ++vcpu->stat.cpucfg_exits;
    + index = vcpu->arch.gprs[rj];
    +
    + vcpu->arch.gprs[rd] = read_cpucfg(index);
    + /* Nested KVM is not supported */
    + if (index == 2)
    + vcpu->arch.gprs[rd] &= ~CPUCFG2_LVZP;
    + if (index == 6)
    + vcpu->arch.gprs[rd] &= ~CPUCFG6_PMP;
    + er = EMULATE_DONE;
    + }
    + break;
    + case 0x4:
    + /* csr GSPR */
    + er = _kvm_handle_csr(vcpu, inst);
    + break;
    + case 0x6:
    + /* iocsr,cache,idle GSPR */
    + switch (((inst.word >> 22) & 0x3ff)) {
    + case 0x18:
    + /* cache GSPR */
    + er = EMULATE_DONE;
    + trace_kvm_exit_cache(vcpu, KVM_TRACE_EXIT_CACHE);
    + break;
    + case 0x19:
    + /* iocsr/idle GSPR */
    + switch (((inst.word >> 15) & 0x1ffff)) {
    + case 0xc90:
    + /* iocsr GSPR */
    + er = _kvm_emu_iocsr(inst, run, vcpu);
    + break;
    + case 0xc91:
    + /* idle GSPR */
    + er = _kvm_emu_idle(vcpu);
    + break;
    + default:
    + er = EMULATE_FAIL;
    + break;
    + }
    + break;
    + default:
    + er = EMULATE_FAIL;
    + break;
    + }
    + break;
    + default:
    + er = EMULATE_FAIL;
    + break;
    + }
    +
    + /* Rollback PC only if emulation was unsuccessful */
    + if (er == EMULATE_FAIL) {
    + kvm_err("[%#lx]%s: unsupported gspr instruction 0x%08x\n",
    + curr_pc, __func__, inst.word);
    +
    + kvm_arch_vcpu_dump_regs(vcpu);
    + vcpu->arch.pc = curr_pc;
    + }
    + return er;
    +}
    +
    +/*
    + * Execute cpucfg instruction will tirggerGSPR,
    + * Also the access to unimplemented csrs 0x15
    + * 0x16, 0x50~0x53, 0x80, 0x81, 0x90~0x95, 0x98
    + * 0xc0~0xff, 0x100~0x109, 0x500~0x502,
    + * cache_op, idle_op iocsr ops the same
    + */
    +static int _kvm_handle_gspr(struct kvm_vcpu *vcpu)
    +{
    + enum emulation_result er = EMULATE_DONE;
    + int ret = RESUME_GUEST;
    +
    + er = _kvm_trap_handle_gspr(vcpu);
    +
    + if (er == EMULATE_DONE) {
    + ret = RESUME_GUEST;
    + } else if (er == EMULATE_DO_MMIO) {
    + vcpu->run->exit_reason = KVM_EXIT_MMIO;
    + ret = RESUME_HOST;
    + } else if (er == EMULATE_DO_IOCSR) {
    + vcpu->run->exit_reason = KVM_EXIT_LOONGARCH_IOCSR;
    + ret = RESUME_HOST;
    + } else {
    + kvm_err("%s internal error\n", __func__);
    + vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
    + ret = RESUME_HOST;
    + }
    + return ret;
    +}
    --
    2.31.1
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