On 6/19/20 12:22 AM, Collin Walling wrote: > DIAGNOSE 0x318 (diag318) is an s390 instruction that allows the storage > of diagnostic information that is collected by the firmware in the case > of hardware/firmware service events. > > QEMU handles the instruction by storing the info in the CPU state. A > subsequent register sync will communicate the data to the hypervisor. > > QEMU handles the migration via a VM State Description. > > This feature depends on the Extended-Length SCCB (els) feature. If > els is not present, then a warning will be printed and the SCLP bit > that allows the Linux kernel to execute the instruction will not be > set. > > Availability of this instruction is determined by byte 134 (aka fac134) > bit 0 of the SCLP Read Info block. This coincidentally expands into the > space used for CPU entries, which means VMs running with the diag318 > capability may not be able to read information regarding all CPUs > unless the guest kernel supports an extended-length SCCB. > > This feature is not supported in protected virtualization mode. > > Signed-off-by: Collin Walling <wall...@linux.ibm.com>
Acked-by: Janosch Frank <fran...@linux.ibm.com> > --- > hw/s390x/sclp.c | 5 +++++ > include/hw/s390x/sclp.h | 3 +++ > target/s390x/cpu.h | 3 ++- > target/s390x/cpu_features.h | 1 + > target/s390x/cpu_features_def.inc.h | 3 +++ > target/s390x/cpu_models.c | 1 + > target/s390x/gen-features.c | 1 + > target/s390x/kvm.c | 31 +++++++++++++++++++++++++++++ > target/s390x/machine.c | 17 ++++++++++++++++ > 9 files changed, 64 insertions(+), 1 deletion(-) > > diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c > index f7c49e339e..78dbfbe427 100644 > --- a/hw/s390x/sclp.c > +++ b/hw/s390x/sclp.c > @@ -152,6 +152,11 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb) > s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT, > read_info->conf_char_ext); > > + if (s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB)) { > + s390_get_feat_block(S390_FEAT_TYPE_SCLP_FAC134, > + &read_info->fac134); > + } > + > read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO | > SCLP_HAS_IOA_RECONFIG); > > diff --git a/include/hw/s390x/sclp.h b/include/hw/s390x/sclp.h > index ef2d63eae9..ccb9f0a676 100644 > --- a/include/hw/s390x/sclp.h > +++ b/include/hw/s390x/sclp.h > @@ -133,6 +133,9 @@ typedef struct ReadInfo { > uint16_t highest_cpu; > uint8_t _reserved5[124 - 122]; /* 122-123 */ > uint32_t hmfai; > + uint8_t _reserved7[134 - 128]; /* 128-133 */ > + uint8_t fac134; > + uint8_t _reserved8[144 - 135]; /* 135-143 */ > struct CPUEntry entries[]; > } QEMU_PACKED ReadInfo; > > diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h > index 035427521c..52765961cf 100644 > --- a/target/s390x/cpu.h > +++ b/target/s390x/cpu.h > @@ -112,6 +112,8 @@ struct CPUS390XState { > uint16_t external_call_addr; > DECLARE_BITMAP(emergency_signals, S390_MAX_CPUS); > > + uint64_t diag318_info; > + > /* Fields up to this point are cleared by a CPU reset */ > struct {} end_reset_fields; > > @@ -136,7 +138,6 @@ struct CPUS390XState { > > /* currently processed sigp order */ > uint8_t sigp_order; > - Whitespace damage > }; > > static inline uint64_t *get_freg(CPUS390XState *cs, int nr) > diff --git a/target/s390x/cpu_features.h b/target/s390x/cpu_features.h > index da695a8346..f74f7fc3a1 100644 > --- a/target/s390x/cpu_features.h > +++ b/target/s390x/cpu_features.h > @@ -23,6 +23,7 @@ typedef enum { > S390_FEAT_TYPE_STFL, > S390_FEAT_TYPE_SCLP_CONF_CHAR, > S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT, > + S390_FEAT_TYPE_SCLP_FAC134, > S390_FEAT_TYPE_SCLP_CPU, > S390_FEAT_TYPE_MISC, > S390_FEAT_TYPE_PLO, > diff --git a/target/s390x/cpu_features_def.inc.h > b/target/s390x/cpu_features_def.inc.h > index 1c04cc18f4..f82b4b5ec1 100644 > --- a/target/s390x/cpu_features_def.inc.h > +++ b/target/s390x/cpu_features_def.inc.h > @@ -122,6 +122,9 @@ DEF_FEAT(SIE_CMMA, "cmma", SCLP_CONF_CHAR_EXT, 1, "SIE: > Collaborative-memory-man > DEF_FEAT(SIE_PFMFI, "pfmfi", SCLP_CONF_CHAR_EXT, 9, "SIE: PFMF > interpretation facility") > DEF_FEAT(SIE_IBS, "ibs", SCLP_CONF_CHAR_EXT, 10, "SIE: > Interlock-and-broadcast-suppression facility") > > +/* Features exposed via SCLP SCCB Facilities byte 134 (bit numbers relative > to byte-134) */ > +DEF_FEAT(DIAG_318, "diag318", SCLP_FAC134, 0, "Control program name and > version codes") > + > /* Features exposed via SCLP CPU info. */ > DEF_FEAT(SIE_F2, "sief2", SCLP_CPU, 4, "SIE: interception format 2 (Virtual > SIE)") > DEF_FEAT(SIE_SKEY, "skey", SCLP_CPU, 5, "SIE: Storage-key facility") > diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c > index 2fa609bffe..034673be54 100644 > --- a/target/s390x/cpu_models.c > +++ b/target/s390x/cpu_models.c > @@ -827,6 +827,7 @@ static void check_consistency(const S390CPUModel *model) > { S390_FEAT_PTFF_STOE, S390_FEAT_MULTIPLE_EPOCH }, > { S390_FEAT_PTFF_STOUE, S390_FEAT_MULTIPLE_EPOCH }, > { S390_FEAT_AP_QUEUE_INTERRUPT_CONTROL, S390_FEAT_AP }, > + { S390_FEAT_DIAG_318, S390_FEAT_EXTENDED_LENGTH_SCCB }, > }; > int i; > > diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c > index 6857f657fb..a1f0a6f3c6 100644 > --- a/target/s390x/gen-features.c > +++ b/target/s390x/gen-features.c > @@ -523,6 +523,7 @@ static uint16_t full_GEN12_GA1[] = { > S390_FEAT_AP_FACILITIES_TEST, > S390_FEAT_AP, > S390_FEAT_EXTENDED_LENGTH_SCCB, > + S390_FEAT_DIAG_318, > }; > > static uint16_t full_GEN12_GA2[] = { > diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c > index a2d5ad78f6..b79feeba9f 100644 > --- a/target/s390x/kvm.c > +++ b/target/s390x/kvm.c > @@ -105,6 +105,7 @@ > > #define DIAG_TIMEREVENT 0x288 > #define DIAG_IPL 0x308 > +#define DIAG_SET_CONTROL_PROGRAM_CODES 0x318 > #define DIAG_KVM_HYPERCALL 0x500 > #define DIAG_KVM_BREAKPOINT 0x501 > > @@ -602,6 +603,11 @@ int kvm_arch_put_registers(CPUState *cs, int level) > cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ETOKEN; > } > > + if (can_sync_regs(cs, KVM_SYNC_DIAG318)) { > + cs->kvm_run->s.regs.diag318 = env->diag318_info; > + cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_DIAG318; > + } > + > /* Finally the prefix */ > if (can_sync_regs(cs, KVM_SYNC_PREFIX)) { > cs->kvm_run->s.regs.prefix = env->psa; > @@ -741,6 +747,10 @@ int kvm_arch_get_registers(CPUState *cs) > } > } > > + if (can_sync_regs(cs, KVM_SYNC_DIAG318)) { > + env->diag318_info = cs->kvm_run->s.regs.diag318; > + } > + > return 0; > } > > @@ -1601,6 +1611,19 @@ static int handle_sw_breakpoint(S390CPU *cpu, struct > kvm_run *run) > return -ENOENT; > } > > +static void handle_diag_318(S390CPU *cpu, struct kvm_run *run) > +{ > + uint64_t reg = (run->s390_sieic.ipa & 0x00f0) >> 4; > + uint64_t diag318_info = run->s.regs.gprs[reg]; > + > + cpu->env.diag318_info = diag318_info; > + > + if (can_sync_regs(CPU(cpu), KVM_SYNC_DIAG318)) { > + run->s.regs.diag318 = diag318_info; > + run->kvm_dirty_regs |= KVM_SYNC_DIAG318; > + } > +} > + > #define DIAG_KVM_CODE_MASK 0x000000000000ffff > > static int handle_diag(S390CPU *cpu, struct kvm_run *run, uint32_t ipb) > @@ -1620,6 +1643,9 @@ static int handle_diag(S390CPU *cpu, struct kvm_run > *run, uint32_t ipb) > case DIAG_IPL: > kvm_handle_diag_308(cpu, run); > break; > + case DIAG_SET_CONTROL_PROGRAM_CODES: > + handle_diag_318(cpu, run); > + break; > case DIAG_KVM_HYPERCALL: > r = handle_hypercall(cpu, run); > break; > @@ -2464,6 +2490,11 @@ void kvm_s390_get_host_cpu_model(S390CPUModel *model, > Error **errp) > */ > set_bit(S390_FEAT_EXTENDED_LENGTH_SCCB, model->features); > > + /* DIAGNOSE 0x318 is not supported under protected virtualization */ > + if (!s390_is_pv() && kvm_check_extension(kvm_state, > KVM_CAP_S390_DIAG318)) { > + set_bit(S390_FEAT_DIAG_318, model->features); > + } > + > /* strip of features that are not part of the maximum model */ > bitmap_and(model->features, model->features, model->def->full_feat, > S390_FEAT_MAX); > diff --git a/target/s390x/machine.c b/target/s390x/machine.c > index 549bb6c280..5b4e82f1ab 100644 > --- a/target/s390x/machine.c > +++ b/target/s390x/machine.c > @@ -234,6 +234,22 @@ const VMStateDescription vmstate_etoken = { > } > }; > > +static bool diag318_needed(void *opaque) > +{ > + return s390_has_feat(S390_FEAT_DIAG_318); > +} > + > +const VMStateDescription vmstate_diag318 = { > + .name = "cpu/diag318", > + .version_id = 1, > + .minimum_version_id = 1, > + .needed = diag318_needed, > + .fields = (VMStateField[]) { > + VMSTATE_UINT64(env.diag318_info, S390CPU), > + VMSTATE_END_OF_LIST() > + } > +}; > + > const VMStateDescription vmstate_s390_cpu = { > .name = "cpu", > .post_load = cpu_post_load, > @@ -270,6 +286,7 @@ const VMStateDescription vmstate_s390_cpu = { > &vmstate_gscb, > &vmstate_bpbc, > &vmstate_etoken, > + &vmstate_diag318, > NULL > }, > }; >
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