diff options
| -rw-r--r-- | hw/ppc/spapr_caps.c | 22 | ||||
| -rw-r--r-- | target/ppc/kvm.c | 42 | ||||
| -rw-r--r-- | target/ppc/kvm_ppc.h | 12 |
3 files changed, 73 insertions, 3 deletions
diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c index 6d6dca30db..942ac8ebbe 100644 --- a/hw/ppc/spapr_caps.c +++ b/hw/ppc/spapr_caps.c @@ -394,6 +394,7 @@ static void cap_large_decr_apply(sPAPRMachineState *spapr, uint8_t val, Error **errp) { PowerPCCPU *cpu = POWERPC_CPU(first_cpu); + PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); if (!val) { return; /* Disabled by default */ @@ -406,9 +407,17 @@ static void cap_large_decr_apply(sPAPRMachineState *spapr, "Large decrementer only supported on POWER9, try -cpu POWER9"); return; } - } else { - error_setg(errp, - "No large decrementer support, try cap-large-decr=off"); + } else if (kvm_enabled()) { + int kvm_nr_bits = kvmppc_get_cap_large_decr(); + + if (!kvm_nr_bits) { + error_setg(errp, + "No large decrementer support, try cap-large-decr=off"); + } else if (pcc->lrg_decr_bits != kvm_nr_bits) { + error_setg(errp, +"KVM large decrementer size (%d) differs to model (%d), try -cap-large-decr=off", + kvm_nr_bits, pcc->lrg_decr_bits); + } } } @@ -419,6 +428,13 @@ static void cap_large_decr_cpu_apply(sPAPRMachineState *spapr, CPUPPCState *env = &cpu->env; target_ulong lpcr = env->spr[SPR_LPCR]; + if (kvm_enabled()) { + if (kvmppc_enable_cap_large_decr(cpu, val)) { + error_setg(errp, + "No large decrementer support, try cap-large-decr=off"); + } + } + if (val) { lpcr |= LPCR_LD; } else { diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c index d01852fe31..f0f5bf9391 100644 --- a/target/ppc/kvm.c +++ b/target/ppc/kvm.c @@ -91,6 +91,7 @@ static int cap_ppc_safe_cache; static int cap_ppc_safe_bounds_check; static int cap_ppc_safe_indirect_branch; static int cap_ppc_nested_kvm_hv; +static int cap_large_decr; static uint32_t debug_inst_opcode; @@ -124,6 +125,7 @@ static bool kvmppc_is_pr(KVMState *ks) static int kvm_ppc_register_host_cpu_type(MachineState *ms); static void kvmppc_get_cpu_characteristics(KVMState *s); +static int kvmppc_get_dec_bits(void); int kvm_arch_init(MachineState *ms, KVMState *s) { @@ -151,6 +153,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s) cap_resize_hpt = kvm_vm_check_extension(s, KVM_CAP_SPAPR_RESIZE_HPT); kvmppc_get_cpu_characteristics(s); cap_ppc_nested_kvm_hv = kvm_vm_check_extension(s, KVM_CAP_PPC_NESTED_HV); + cap_large_decr = kvmppc_get_dec_bits(); /* * Note: setting it to false because there is not such capability * in KVM at this moment. @@ -1927,6 +1930,16 @@ uint64_t kvmppc_get_clockfreq(void) return kvmppc_read_int_cpu_dt("clock-frequency"); } +static int kvmppc_get_dec_bits(void) +{ + int nr_bits = kvmppc_read_int_cpu_dt("ibm,dec-bits"); + + if (nr_bits > 0) { + return nr_bits; + } + return 0; +} + static int kvmppc_get_pvinfo(CPUPPCState *env, struct kvm_ppc_pvinfo *pvinfo) { PowerPCCPU *cpu = ppc_env_get_cpu(env); @@ -2442,6 +2455,35 @@ bool kvmppc_has_cap_spapr_vfio(void) return cap_spapr_vfio; } +int kvmppc_get_cap_large_decr(void) +{ + return cap_large_decr; +} + +int kvmppc_enable_cap_large_decr(PowerPCCPU *cpu, int enable) +{ + CPUState *cs = CPU(cpu); + uint64_t lpcr; + + kvm_get_one_reg(cs, KVM_REG_PPC_LPCR_64, &lpcr); + /* Do we need to modify the LPCR? */ + if (!!(lpcr & LPCR_LD) != !!enable) { + if (enable) { + lpcr |= LPCR_LD; + } else { + lpcr &= ~LPCR_LD; + } + kvm_set_one_reg(cs, KVM_REG_PPC_LPCR_64, &lpcr); + kvm_get_one_reg(cs, KVM_REG_PPC_LPCR_64, &lpcr); + + if (!!(lpcr & LPCR_LD) != !!enable) { + return -1; + } + } + + return 0; +} + PowerPCCPUClass *kvm_ppc_get_host_cpu_class(void) { uint32_t host_pvr = mfpvr(); diff --git a/target/ppc/kvm_ppc.h b/target/ppc/kvm_ppc.h index bdfaa4e70a..a79835bd14 100644 --- a/target/ppc/kvm_ppc.h +++ b/target/ppc/kvm_ppc.h @@ -64,6 +64,8 @@ int kvmppc_get_cap_safe_bounds_check(void); int kvmppc_get_cap_safe_indirect_branch(void); bool kvmppc_has_cap_nested_kvm_hv(void); int kvmppc_set_cap_nested_kvm_hv(int enable); +int kvmppc_get_cap_large_decr(void); +int kvmppc_enable_cap_large_decr(PowerPCCPU *cpu, int enable); int kvmppc_enable_hwrng(void); int kvmppc_put_books_sregs(PowerPCCPU *cpu); PowerPCCPUClass *kvm_ppc_get_host_cpu_class(void); @@ -332,6 +334,16 @@ static inline int kvmppc_set_cap_nested_kvm_hv(int enable) return -1; } +static inline int kvmppc_get_cap_large_decr(void) +{ + return 0; +} + +static inline int kvmppc_enable_cap_large_decr(PowerPCCPU *cpu, int enable) +{ + return -1; +} + static inline int kvmppc_enable_hwrng(void) { return -1; |