From: "liguang.zhang" <liguang.zh...@hexintek.com> Fix the guest reboot error when using KVM There are two issues when rebooting a guest using KVM 1. When the guest initiates a reboot the host is unable to stop the vcpu 2. When running a SMP guest the qemu monitor system_reset causes a vcpu crash
This can be fixed by clearing the CSR values at reset and syncing the MPSTATE with the host. v4 update: rebase on riscv-to-apply Signed-off-by: liguang.zhang <liguang.zh...@hexintek.com> --- target/riscv/kvm.c | 42 ++++++++++++++++++++++++++++++++++++++++ target/riscv/kvm_riscv.h | 1 + 2 files changed, 43 insertions(+) diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c index c01cfb03f4..8ee410b9b1 100644 --- a/target/riscv/kvm.c +++ b/target/riscv/kvm.c @@ -51,6 +51,8 @@ void riscv_kvm_aplic_request(void *opaque, int irq, int level) kvm_set_irq(kvm_state, irq, !!level); } +static bool cap_has_mp_state; + static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type, uint64_t idx) { @@ -797,6 +799,24 @@ int kvm_arch_get_registers(CPUState *cs) return ret; } +int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state) +{ + if (cap_has_mp_state) { + struct kvm_mp_state mp_state = { + .mp_state = state + }; + + int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state); + if (ret) { + fprintf(stderr, "%s: failed to sync MP_STATE %d/%s\n", + __func__, ret, strerror(-ret)); + return -1; + } + } + + return 0; +} + int kvm_arch_put_registers(CPUState *cs, int level) { int ret = 0; @@ -816,6 +836,18 @@ int kvm_arch_put_registers(CPUState *cs, int level) return ret; } + if (KVM_PUT_RESET_STATE == level) { + RISCVCPU *cpu = RISCV_CPU(cs); + if (cs->cpu_index == 0) { + ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_RUNNABLE); + } else { + ret = kvm_riscv_sync_mpstate_to_kvm(cpu, KVM_MP_STATE_STOPPED); + } + if (ret) { + return ret; + } + } + return ret; } @@ -928,6 +960,7 @@ int kvm_arch_get_default_type(MachineState *ms) int kvm_arch_init(MachineState *ms, KVMState *s) { + cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE); return 0; } @@ -1014,10 +1047,19 @@ void kvm_riscv_reset_vcpu(RISCVCPU *cpu) if (!kvm_enabled()) { return; } + for (int i=0; i<32; i++) + env->gpr[i] = 0; env->pc = cpu->env.kernel_addr; env->gpr[10] = kvm_arch_vcpu_id(CPU(cpu)); /* a0 */ env->gpr[11] = cpu->env.fdt_addr; /* a1 */ env->satp = 0; + env->mie = 0; + env->stvec = 0; + env->sscratch = 0; + env->sepc = 0; + env->scause = 0; + env->stval = 0; + env->mip = 0; } void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level) diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h index de8c209ebc..8f8c1f969a 100644 --- a/target/riscv/kvm_riscv.h +++ b/target/riscv/kvm_riscv.h @@ -27,5 +27,6 @@ void kvm_riscv_aia_create(MachineState *machine, uint64_t group_shift, uint64_t aplic_base, uint64_t imsic_base, uint64_t guest_num); void riscv_kvm_aplic_request(void *opaque, int irq, int level); +int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state); #endif -- 2.41.0