diff options
Diffstat (limited to 'hw/ppc/spapr.c')
| -rw-r--r-- | hw/ppc/spapr.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index d967ec3..a355512 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -228,7 +228,8 @@ static int spapr_fixup_cpu_numa_dt(void *fdt, int offset, CPUState *cs) } /* Populate the "ibm,pa-features" property */ -static void spapr_populate_pa_features(CPUPPCState *env, void *fdt, int offset) +static void spapr_populate_pa_features(CPUPPCState *env, void *fdt, int offset, + bool legacy_guest) { uint8_t pa_features_206[] = { 6, 0, 0xf6, 0x1f, 0xc7, 0x00, 0x80, 0xc0 }; @@ -295,6 +296,12 @@ static void spapr_populate_pa_features(CPUPPCState *env, void *fdt, int offset) if (kvmppc_has_cap_htm() && pa_size > 24) { pa_features[24] |= 0x80; /* Transactional memory support */ } + if (legacy_guest && pa_size > 40) { + /* Workaround for broken kernels that attempt (guest) radix + * mode when they can't handle it, if they see the radix bit set + * in pa-features. So hide it from them. */ + pa_features[40 + 2] &= ~0x80; /* Radix MMU */ + } _FDT((fdt_setprop(fdt, offset, "ibm,pa-features", pa_features, pa_size))); } @@ -309,6 +316,7 @@ static int spapr_fixup_cpu_dt(void *fdt, sPAPRMachineState *spapr) CPU_FOREACH(cs) { PowerPCCPU *cpu = POWERPC_CPU(cs); + CPUPPCState *env = &cpu->env; DeviceClass *dc = DEVICE_GET_CLASS(cs); int index = ppc_get_vcpu_dt_id(cpu); int compat_smt = MIN(smp_threads, ppc_compat_max_threads(cpu)); @@ -350,6 +358,9 @@ static int spapr_fixup_cpu_dt(void *fdt, sPAPRMachineState *spapr) if (ret < 0) { return ret; } + + spapr_populate_pa_features(env, fdt, offset, + spapr->cas_legacy_guest_workaround); } return ret; } @@ -547,7 +558,7 @@ static void spapr_populate_cpu_dt(CPUState *cs, void *fdt, int offset, page_sizes_prop, page_sizes_prop_size))); } - spapr_populate_pa_features(env, fdt, offset); + spapr_populate_pa_features(env, fdt, offset, false); _FDT((fdt_setprop_cell(fdt, offset, "ibm,chip-id", cs->cpu_index / vcpus_per_socket))); |