KVM: PPC: Book3s: Remove kvmppc_read_inst() function
In the context of replacing kvmppc_ld() function calls with a version of kvmppc_get_last_inst() which allow to fail, Alex Graf suggested this: "If we get EMULATE_AGAIN, we just have to make sure we go back into the guest. No need to inject an ISI into the guest - it'll do that all by itself. With an error returning kvmppc_get_last_inst we can just use completely get rid of kvmppc_read_inst() and only use kvmppc_get_last_inst() instead." As a intermediate step get rid of kvmppc_read_inst() and only use kvmppc_ld() instead. Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de>
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@ -710,42 +710,6 @@ static void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac)
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#endif
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}
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static int kvmppc_read_inst(struct kvm_vcpu *vcpu)
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{
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ulong srr0 = kvmppc_get_pc(vcpu);
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u32 last_inst = kvmppc_get_last_inst(vcpu);
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int ret;
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ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false);
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if (ret == -ENOENT) {
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ulong msr = kvmppc_get_msr(vcpu);
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msr = kvmppc_set_field(msr, 33, 33, 1);
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msr = kvmppc_set_field(msr, 34, 36, 0);
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msr = kvmppc_set_field(msr, 42, 47, 0);
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kvmppc_set_msr_fast(vcpu, msr);
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kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
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return EMULATE_AGAIN;
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}
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return EMULATE_DONE;
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}
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static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr)
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{
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/* Need to do paired single emulation? */
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if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE))
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return EMULATE_DONE;
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/* Read out the instruction */
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if (kvmppc_read_inst(vcpu) == EMULATE_DONE)
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/* Need to emulate */
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return EMULATE_FAIL;
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return EMULATE_AGAIN;
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}
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/* Handle external providers (FPU, Altivec, VSX) */
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static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
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ulong msr)
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@ -1149,31 +1113,49 @@ int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
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case BOOK3S_INTERRUPT_VSX:
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{
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int ext_msr = 0;
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int emul;
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ulong pc;
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u32 last_inst;
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if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE) {
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/* Do paired single instruction emulation */
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pc = kvmppc_get_pc(vcpu);
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last_inst = kvmppc_get_last_inst(vcpu);
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emul = kvmppc_ld(vcpu, &pc, sizeof(u32), &last_inst,
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false);
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if (emul == EMULATE_DONE)
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goto program_interrupt;
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else
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r = RESUME_GUEST;
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break;
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}
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/* Enable external provider */
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switch (exit_nr) {
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case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP; break;
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case BOOK3S_INTERRUPT_ALTIVEC: ext_msr = MSR_VEC; break;
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case BOOK3S_INTERRUPT_VSX: ext_msr = MSR_VSX; break;
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case BOOK3S_INTERRUPT_FP_UNAVAIL:
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ext_msr = MSR_FP;
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break;
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case BOOK3S_INTERRUPT_ALTIVEC:
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ext_msr = MSR_VEC;
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break;
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case BOOK3S_INTERRUPT_VSX:
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ext_msr = MSR_VSX;
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break;
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}
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switch (kvmppc_check_ext(vcpu, exit_nr)) {
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case EMULATE_DONE:
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/* everything ok - let's enable the ext */
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r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
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break;
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case EMULATE_FAIL:
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/* we need to emulate this instruction */
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goto program_interrupt;
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break;
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default:
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/* nothing to worry about - go again */
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break;
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}
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r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
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break;
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}
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case BOOK3S_INTERRUPT_ALIGNMENT:
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if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
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u32 last_inst = kvmppc_get_last_inst(vcpu);
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{
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ulong pc = kvmppc_get_pc(vcpu);
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u32 last_inst = kvmppc_get_last_inst(vcpu);
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int emul = kvmppc_ld(vcpu, &pc, sizeof(u32), &last_inst, false);
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if (emul == EMULATE_DONE) {
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u32 dsisr;
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u64 dar;
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@ -1187,6 +1169,7 @@ int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
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}
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r = RESUME_GUEST;
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break;
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}
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#ifdef CONFIG_PPC_BOOK3S_64
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case BOOK3S_INTERRUPT_FAC_UNAVAIL:
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kvmppc_handle_fac(vcpu, vcpu->arch.shadow_fscr >> 56);
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