diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv.c')
-rw-r--r-- | arch/powerpc/kvm/book3s_hv.c | 61 |
1 files changed, 60 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 04bd717..f61dd9e 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -123,6 +123,32 @@ static bool no_mixing_hpt_and_radix; static void kvmppc_end_cede(struct kvm_vcpu *vcpu); static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu); +/* + * RWMR values for POWER8. These control the rate at which PURR + * and SPURR count and should be set according to the number of + * online threads in the vcore being run. + */ +#define RWMR_RPA_P8_1THREAD 0x164520C62609AECA +#define RWMR_RPA_P8_2THREAD 0x7FFF2908450D8DA9 +#define RWMR_RPA_P8_3THREAD 0x164520C62609AECA +#define RWMR_RPA_P8_4THREAD 0x199A421245058DA9 +#define RWMR_RPA_P8_5THREAD 0x164520C62609AECA +#define RWMR_RPA_P8_6THREAD 0x164520C62609AECA +#define RWMR_RPA_P8_7THREAD 0x164520C62609AECA +#define RWMR_RPA_P8_8THREAD 0x164520C62609AECA + +static unsigned long p8_rwmr_values[MAX_SMT_THREADS + 1] = { + RWMR_RPA_P8_1THREAD, + RWMR_RPA_P8_1THREAD, + RWMR_RPA_P8_2THREAD, + RWMR_RPA_P8_3THREAD, + RWMR_RPA_P8_4THREAD, + RWMR_RPA_P8_5THREAD, + RWMR_RPA_P8_6THREAD, + RWMR_RPA_P8_7THREAD, + RWMR_RPA_P8_8THREAD, +}; + static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc, int *ip) { @@ -1761,7 +1787,12 @@ static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, vcpu->arch.vcore->tb_offset; break; case KVM_REG_PPC_ONLINE: - vcpu->arch.online = set_reg_val(id, *val); + i = set_reg_val(id, *val); + if (i && !vcpu->arch.online) + atomic_inc(&vcpu->arch.vcore->online_count); + else if (!i && vcpu->arch.online) + atomic_dec(&vcpu->arch.vcore->online_count); + vcpu->arch.online = i; break; default: r = -EINVAL; @@ -2856,6 +2887,25 @@ static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) } } + /* + * On POWER8, set RWMR register. + * Since it only affects PURR and SPURR, it doesn't affect + * the host, so we don't save/restore the host value. + */ + if (is_power8) { + unsigned long rwmr_val = RWMR_RPA_P8_8THREAD; + int n_online = atomic_read(&vc->online_count); + + /* + * Use the 8-thread value if we're doing split-core + * or if the vcore's online count looks bogus. + */ + if (split == 1 && threads_per_subcore == MAX_SMT_THREADS && + n_online >= 1 && n_online <= MAX_SMT_THREADS) + rwmr_val = p8_rwmr_values[n_online]; + mtspr(SPRN_RWMR, rwmr_val); + } + /* Start all the threads */ active = 0; for (sub = 0; sub < core_info.n_subcores; ++sub) { @@ -3358,6 +3408,15 @@ static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu) } #endif + /* + * Force online to 1 for the sake of old userspace which doesn't + * set it. + */ + if (!vcpu->arch.online) { + atomic_inc(&vcpu->arch.vcore->online_count); + vcpu->arch.online = 1; + } + kvmppc_core_prepare_to_enter(vcpu); /* No need to go into the guest when all we'll do is come back out */ |