Implement vcpu run interface, handling mmio, iocsr reading fault and deliver interrupt, lose fpu before vcpu enter guest. Reviewed-by: Bibo Mao <maobibo@xxxxxxxxxxx> Signed-off-by: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx> --- arch/loongarch/kvm/vcpu.c | 83 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index 24b5b00266a1..eba5c07b8be3 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -17,6 +17,41 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) return 0; } +/* Returns 1 if the guest TLB may be clobbered */ +static int _kvm_check_requests(struct kvm_vcpu *vcpu) +{ + int ret = 0; + + if (!kvm_request_pending(vcpu)) + return 0; + + if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { + /* Drop vpid for this vCPU */ + vcpu->arch.vpid = 0; + /* This will clobber guest TLB contents too */ + ret = 1; + } + + return ret; +} + +static void kvm_pre_enter_guest(struct kvm_vcpu *vcpu) +{ + /* + * handle vcpu timer, interrupts, check requests and + * check vmid before vcpu enter guest + */ + kvm_acquire_timer(vcpu); + _kvm_deliver_intr(vcpu); + /* make sure the vcpu mode has been written */ + smp_store_mb(vcpu->mode, IN_GUEST_MODE); + _kvm_check_requests(vcpu); + _kvm_check_vmid(vcpu); + vcpu->arch.host_eentry = csr_read64(LOONGARCH_CSR_EENTRY); + /* clear KVM_LARCH_CSR as csr will change when enter guest */ + vcpu->arch.aux_inuse &= ~KVM_LARCH_CSR; +} + int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) { unsigned long timer_hz; @@ -86,3 +121,51 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) context->last_vcpu = NULL; } } + +int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) +{ + int r = -EINTR; + struct kvm_run *run = vcpu->run; + + vcpu_load(vcpu); + + kvm_sigset_activate(vcpu); + + if (vcpu->mmio_needed) { + if (!vcpu->mmio_is_write) + _kvm_complete_mmio_read(vcpu, run); + vcpu->mmio_needed = 0; + } + + if (run->exit_reason == KVM_EXIT_LOONGARCH_IOCSR) { + if (!run->iocsr_io.is_write) + _kvm_complete_iocsr_read(vcpu, run); + } + + /* clear exit_reason */ + run->exit_reason = KVM_EXIT_UNKNOWN; + if (run->immediate_exit) + goto out; + + lose_fpu(1); + + local_irq_disable(); + guest_timing_enter_irqoff(); + + kvm_pre_enter_guest(vcpu); + trace_kvm_enter(vcpu); + + guest_state_enter_irqoff(); + r = kvm_loongarch_ops->enter_guest(run, vcpu); + + /* guest_state_exit_irqoff() already done. */ + trace_kvm_out(vcpu); + guest_timing_exit_irqoff(); + local_irq_enable(); + +out: + kvm_sigset_deactivate(vcpu); + + vcpu_put(vcpu); + return r; +} -- 2.39.1