diff options
Diffstat (limited to 'target/ppc/excp_helper.c')
| -rw-r--r-- | target/ppc/excp_helper.c | 217 |
1 files changed, 164 insertions, 53 deletions
diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c index 85de7e6c90..f4f15279eb 100644 --- a/target/ppc/excp_helper.c +++ b/target/ppc/excp_helper.c @@ -136,25 +136,157 @@ static int powerpc_reset_wakeup(CPUState *cs, CPUPPCState *env, int excp, return POWERPC_EXCP_RESET; } -static uint64_t ppc_excp_vector_offset(CPUState *cs, int ail) +/* + * AIL - Alternate Interrupt Location, a mode that allows interrupts to be + * taken with the MMU on, and which uses an alternate location (e.g., so the + * kernel/hv can map the vectors there with an effective address). + * + * An interrupt is considered to be taken "with AIL" or "AIL applies" if they + * are delivered in this way. AIL requires the LPCR to be set to enable this + * mode, and then a number of conditions have to be true for AIL to apply. + * + * First of all, SRESET, MCE, and HMI are always delivered without AIL, because + * they specifically want to be in real mode (e.g., the MCE might be signaling + * a SLB multi-hit which requires SLB flush before the MMU can be enabled). + * + * After that, behaviour depends on the current MSR[IR], MSR[DR], MSR[HV], + * whether or not the interrupt changes MSR[HV] from 0 to 1, and the current + * radix mode (LPCR[HR]). + * + * POWER8, POWER9 with LPCR[HR]=0 + * | LPCR[AIL] | MSR[IR||DR] | MSR[HV] | new MSR[HV] | AIL | + * +-----------+-------------+---------+-------------+-----+ + * | a | 00/01/10 | x | x | 0 | + * | a | 11 | 0 | 1 | 0 | + * | a | 11 | 1 | 1 | a | + * | a | 11 | 0 | 0 | a | + * +-------------------------------------------------------+ + * + * POWER9 with LPCR[HR]=1 + * | LPCR[AIL] | MSR[IR||DR] | MSR[HV] | new MSR[HV] | AIL | + * +-----------+-------------+---------+-------------+-----+ + * | a | 00/01/10 | x | x | 0 | + * | a | 11 | x | x | a | + * +-------------------------------------------------------+ + * + * The difference with POWER9 being that MSR[HV] 0->1 interrupts can be sent to + * the hypervisor in AIL mode if the guest is radix. This is good for + * performance but allows the guest to influence the AIL of hypervisor + * interrupts using its MSR, and also the hypervisor must disallow guest + * interrupts (MSR[HV] 0->0) from using AIL if the hypervisor does not want to + * use AIL for its MSR[HV] 0->1 interrupts. + * + * POWER10 addresses those issues with a new LPCR[HAIL] bit that is applied to + * interrupts that begin execution with MSR[HV]=1 (so both MSR[HV] 0->1 and + * MSR[HV] 1->1). + * + * HAIL=1 is equivalent to AIL=3, for interrupts delivered with MSR[HV]=1. + * + * POWER10 behaviour is + * | LPCR[AIL] | LPCR[HAIL] | MSR[IR||DR] | MSR[HV] | new MSR[HV] | AIL | + * +-----------+------------+-------------+---------+-------------+-----+ + * | a | h | 00/01/10 | 0 | 0 | 0 | + * | a | h | 11 | 0 | 0 | a | + * | a | h | x | 0 | 1 | h | + * | a | h | 00/01/10 | 1 | 1 | 0 | + * | a | h | 11 | 1 | 1 | h | + * +--------------------------------------------------------------------+ + */ +static inline void ppc_excp_apply_ail(PowerPCCPU *cpu, int excp_model, int excp, + target_ulong msr, + target_ulong *new_msr, + target_ulong *vector) { - uint64_t offset = 0; +#if defined(TARGET_PPC64) + CPUPPCState *env = &cpu->env; + bool mmu_all_on = ((msr >> MSR_IR) & 1) && ((msr >> MSR_DR) & 1); + bool hv_escalation = !(msr & MSR_HVB) && (*new_msr & MSR_HVB); + int ail = 0; + + if (excp == POWERPC_EXCP_MCHECK || + excp == POWERPC_EXCP_RESET || + excp == POWERPC_EXCP_HV_MAINT) { + /* SRESET, MCE, HMI never apply AIL */ + return; + } - switch (ail) { - case AIL_NONE: - break; - case AIL_0001_8000: - offset = 0x18000; - break; - case AIL_C000_0000_0000_4000: - offset = 0xc000000000004000ull; - break; - default: - cpu_abort(cs, "Invalid AIL combination %d\n", ail); - break; + if (excp_model == POWERPC_EXCP_POWER8 || + excp_model == POWERPC_EXCP_POWER9) { + if (!mmu_all_on) { + /* AIL only works if MSR[IR] and MSR[DR] are both enabled. */ + return; + } + if (hv_escalation && !(env->spr[SPR_LPCR] & LPCR_HR)) { + /* + * AIL does not work if there is a MSR[HV] 0->1 transition and the + * partition is in HPT mode. For radix guests, such interrupts are + * allowed to be delivered to the hypervisor in ail mode. + */ + return; + } + + ail = (env->spr[SPR_LPCR] & LPCR_AIL) >> LPCR_AIL_SHIFT; + if (ail == 0) { + return; + } + if (ail == 1) { + /* AIL=1 is reserved, treat it like AIL=0 */ + return; + } + + } else if (excp_model == POWERPC_EXCP_POWER10) { + if (!mmu_all_on && !hv_escalation) { + /* + * AIL works for HV interrupts even with guest MSR[IR/DR] disabled. + * Guest->guest and HV->HV interrupts do require MMU on. + */ + return; + } + + if (*new_msr & MSR_HVB) { + if (!(env->spr[SPR_LPCR] & LPCR_HAIL)) { + /* HV interrupts depend on LPCR[HAIL] */ + return; + } + ail = 3; /* HAIL=1 gives AIL=3 behaviour for HV interrupts */ + } else { + ail = (env->spr[SPR_LPCR] & LPCR_AIL) >> LPCR_AIL_SHIFT; + } + if (ail == 0) { + return; + } + if (ail == 1 || ail == 2) { + /* AIL=1 and AIL=2 are reserved, treat them like AIL=0 */ + return; + } + } else { + /* Other processors do not support AIL */ + return; } - return offset; + /* + * AIL applies, so the new MSR gets IR and DR set, and an offset applied + * to the new IP. + */ + *new_msr |= (1 << MSR_IR) | (1 << MSR_DR); + + if (excp != POWERPC_EXCP_SYSCALL_VECTORED) { + if (ail == 2) { + *vector |= 0x0000000000018000ull; + } else if (ail == 3) { + *vector |= 0xc000000000004000ull; + } + } else { + /* + * scv AIL is a little different. AIL=2 does not change the address, + * only the MSR. AIL=3 replaces the 0x17000 base with 0xc...3000. + */ + if (ail == 3) { + *vector &= ~0x0000000000017000ull; /* Un-apply the base offset */ + *vector |= 0xc000000000003000ull; /* Apply scv's AIL=3 offset */ + } + } +#endif } static inline void powerpc_set_excp_state(PowerPCCPU *cpu, @@ -197,7 +329,7 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp) CPUState *cs = CPU(cpu); CPUPPCState *env = &cpu->env; target_ulong msr, new_msr, vector; - int srr0, srr1, asrr0, asrr1, lev = -1, ail; + int srr0, srr1, asrr0, asrr1, lev = -1; bool lpes0; qemu_log_mask(CPU_LOG_INT, "Raise exception at " TARGET_FMT_lx @@ -238,25 +370,17 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp) * * On anything else, we behave as if LPES0 is 1 * (externals don't alter MSR:HV) - * - * AIL is initialized here but can be cleared by - * selected exceptions */ #if defined(TARGET_PPC64) if (excp_model == POWERPC_EXCP_POWER7 || excp_model == POWERPC_EXCP_POWER8 || - excp_model == POWERPC_EXCP_POWER9) { + excp_model == POWERPC_EXCP_POWER9 || + excp_model == POWERPC_EXCP_POWER10) { lpes0 = !!(env->spr[SPR_LPCR] & LPCR_LPES0); - if (excp_model != POWERPC_EXCP_POWER7) { - ail = (env->spr[SPR_LPCR] & LPCR_AIL) >> LPCR_AIL_SHIFT; - } else { - ail = 0; - } } else #endif /* defined(TARGET_PPC64) */ { lpes0 = true; - ail = 0; } /* @@ -315,7 +439,6 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp) */ new_msr |= (target_ulong)MSR_HVB; } - ail = 0; /* machine check exceptions don't have ME set */ new_msr &= ~((target_ulong)1 << MSR_ME); @@ -519,7 +642,6 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp) "exception %d with no HV support\n", excp); } } - ail = 0; break; case POWERPC_EXCP_DSEG: /* Data segment exception */ case POWERPC_EXCP_ISEG: /* Instruction segment exception */ @@ -773,7 +895,8 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp) } else if (env->spr[SPR_LPCR] & LPCR_ILE) { new_msr |= (target_ulong)1 << MSR_LE; } - } else if (excp_model == POWERPC_EXCP_POWER9) { + } else if (excp_model == POWERPC_EXCP_POWER9 || + excp_model == POWERPC_EXCP_POWER10) { if (new_msr & MSR_HVB) { if (env->spr[SPR_HID0] & HID0_POWER9_HILE) { new_msr |= (target_ulong)1 << MSR_LE; @@ -790,15 +913,6 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp) } #endif - /* - * AIL only works if there is no HV transition and we are running - * with translations enabled - */ - if (!((msr >> MSR_IR) & 1) || !((msr >> MSR_DR) & 1) || - ((new_msr & MSR_HVB) && !(msr & MSR_HVB))) { - ail = 0; - } - vector = env->excp_vectors[excp]; if (vector == (target_ulong)-1ULL) { cpu_abort(cs, "Raised an exception without defined vector %d\n", @@ -839,23 +953,8 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp) /* Save MSR */ env->spr[srr1] = msr; - /* Handle AIL */ - if (ail) { - new_msr |= (1 << MSR_IR) | (1 << MSR_DR); - vector |= ppc_excp_vector_offset(cs, ail); - } - #if defined(TARGET_PPC64) } else { - /* scv AIL is a little different */ - if (ail) { - new_msr |= (1 << MSR_IR) | (1 << MSR_DR); - } - if (ail == AIL_C000_0000_0000_4000) { - vector |= 0xc000000000003000ull; - } else { - vector |= 0x0000000000017000ull; - } vector += lev * 0x20; env->lr = env->nip; @@ -863,6 +962,9 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp) #endif } + /* This can update new_msr and vector if AIL applies */ + ppc_excp_apply_ail(cpu, excp_model, excp, msr, &new_msr, &vector); + powerpc_set_excp_state(cpu, vector, new_msr); } @@ -1130,6 +1232,15 @@ void helper_store_msr(CPUPPCState *env, target_ulong val) } #if defined(TARGET_PPC64) +void helper_scv(CPUPPCState *env, uint32_t lev) +{ + if (env->spr[SPR_FSCR] & (1ull << FSCR_SCV)) { + raise_exception_err(env, POWERPC_EXCP_SYSCALL_VECTORED, lev); + } else { + raise_exception_err(env, POWERPC_EXCP_FU, FSCR_IC_SCV); + } +} + void helper_pminsn(CPUPPCState *env, powerpc_pm_insn_t insn) { CPUState *cs; |