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target/ppc: Machine check on invalid real address access on POWER9/10

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ppc currently silently accepts invalid real address access. Catch
these and turn them into machine checks on POWER9/10 machines.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-ID: <20230703120301.45313-1-npiggin@gmail.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Nicholas Piggin 2023-07-03 22:03:01 +10:00 committed by Daniel Henrique Barboza
parent e1a821d471
commit 55a7fa34f8
3 changed files with 55 additions and 0 deletions
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1
target/ppc/cpu_init.c
View File

@ -7335,6 +7335,7 @@ static const struct TCGCPUOps ppc_tcg_ops = {
.cpu_exec_enter = ppc_cpu_exec_enter,
.cpu_exec_exit = ppc_cpu_exec_exit,
.do_unaligned_access = ppc_cpu_do_unaligned_access,
.do_transaction_failed = ppc_cpu_do_transaction_failed,
#endif /* !CONFIG_USER_ONLY */
};
#endif /* CONFIG_TCG */

49
target/ppc/excp_helper.c
View File

@ -1428,7 +1428,9 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int excp)
/* machine check exceptions don't have ME set */
new_msr &= ~((target_ulong)1 << MSR_ME);
msr |= env->error_code;
break;
case POWERPC_EXCP_DSI: /* Data storage exception */
trace_ppc_excp_dsi(env->spr[SPR_DSISR], env->spr[SPR_DAR]);
break;
@ -3188,5 +3190,52 @@ void ppc_cpu_do_unaligned_access(CPUState *cs, vaddr vaddr,
env->error_code = insn & 0x03FF0000;
cpu_loop_exit(cs);
}
void ppc_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
vaddr vaddr, unsigned size,
MMUAccessType access_type,
int mmu_idx, MemTxAttrs attrs,
MemTxResult response, uintptr_t retaddr)
{
CPUPPCState *env = cs->env_ptr;
switch (env->excp_model) {
#if defined(TARGET_PPC64)
case POWERPC_EXCP_POWER9:
case POWERPC_EXCP_POWER10:
/*
* Machine check codes can be found in processor User Manual or
* Linux or skiboot source.
*/
if (access_type == MMU_DATA_LOAD) {
env->spr[SPR_DAR] = vaddr;
env->spr[SPR_DSISR] = PPC_BIT(57);
env->error_code = PPC_BIT(42);
} else if (access_type == MMU_DATA_STORE) {
/*
* MCE for stores in POWER is asynchronous so hardware does
* not set DAR, but QEMU can do better.
*/
env->spr[SPR_DAR] = vaddr;
env->error_code = PPC_BIT(36) | PPC_BIT(43) | PPC_BIT(45);
env->error_code |= PPC_BIT(42);
} else { /* Fetch */
env->error_code = PPC_BIT(36) | PPC_BIT(44) | PPC_BIT(45);
}
break;
#endif
default:
/*
* TODO: Check behaviour for other CPUs, for now do nothing.
* Could add a basic MCE even if real hardware ignores.
*/
return;
}
cs->exception_index = POWERPC_EXCP_MCHECK;
cpu_loop_exit_restore(cs, retaddr);
}
#endif /* CONFIG_TCG */
#endif /* !CONFIG_USER_ONLY */

5
target/ppc/internal.h
View File

@ -296,6 +296,11 @@ bool ppc_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
G_NORETURN void ppc_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
MMUAccessType access_type, int mmu_idx,
uintptr_t retaddr);
void ppc_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
vaddr addr, unsigned size,
MMUAccessType access_type,
int mmu_idx, MemTxAttrs attrs,
MemTxResult response, uintptr_t retaddr);
#endif
FIELD(GER_MSK, XMSK, 0, 4)