diff options
| -rw-r--r-- | hw/ppc/spapr.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index d2d1e310a3..4345764bce 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -353,6 +353,32 @@ static void spapr_dt_pa_features(SpaprMachineState *spapr, _FDT((fdt_setprop(fdt, offset, "ibm,pa-features", pa_features, pa_size))); } +static void spapr_dt_pi_features(SpaprMachineState *spapr, + PowerPCCPU *cpu, + void *fdt, int offset) +{ + uint8_t pi_features[] = { 1, 0, + 0x00 }; + + if (kvm_enabled() && ppc_check_compat(cpu, CPU_POWERPC_LOGICAL_3_00, + 0, cpu->compat_pvr)) { + /* + * POWER9 and later CPUs with KVM run in LPAR-per-thread mode where + * all threads are essentially independent CPUs, and msgsndp does not + * work (because it is physically-addressed) and therefore is + * emulated by KVM, so disable it here to ensure XIVE will be used. + * This is both KVM and CPU implementation-specific behaviour so a KVM + * cap would be cleanest, but for now this works. If KVM ever permits + * native msgsndp execution by guests, a cap could be added at that + * time. + */ + pi_features[2] |= 0x08; /* 4: No msgsndp */ + } + + _FDT((fdt_setprop(fdt, offset, "ibm,pi-features", pi_features, + sizeof(pi_features)))); +} + static hwaddr spapr_node0_size(MachineState *machine) { if (machine->numa_state->num_nodes) { @@ -815,6 +841,8 @@ static void spapr_dt_cpu(CPUState *cs, void *fdt, int offset, spapr_dt_pa_features(spapr, cpu, fdt, offset); + spapr_dt_pi_features(spapr, cpu, fdt, offset); + _FDT((fdt_setprop_cell(fdt, offset, "ibm,chip-id", cs->cpu_index / vcpus_per_socket))); |