| Message ID | 20230609090832.2131037-8-zhaotianrui@loongson.cn (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add KVM LoongArch support | expand |
Reviewed-by: Bibo Mao <maobibo@loongson.cn> Regards Bibo, Mao 在 2023/6/9 17:08, Tianrui Zhao 写道: > Implement vcpu run interface, handling mmio, iocsr reading fault > and deliver interrupt, lose fpu before vcpu enter guest. > > Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn> > --- > 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; > +}
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; +}
Implement vcpu run interface, handling mmio, iocsr reading fault and deliver interrupt, lose fpu before vcpu enter guest. Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn> --- arch/loongarch/kvm/vcpu.c | 83 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+)