| Message ID | 20230105145313.168489-7-pmorel@linux.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | s390x: CPU Topology | expand |
On Thu, 2023-01-05 at 15:53 +0100, Pierre Morel wrote: > When the host supports the CPU topology facility, the PTF > instruction with function code 2 is interpreted by the SIE, > provided that the userland hypervizor activates the interpretation > by using the KVM_CAP_S390_CPU_TOPOLOGY KVM extension. > > The PTF instructions with function code 0 and 1 are intercepted > and must be emulated by the userland hypervizor. > > During RESET all CPU of the configuration are placed in > horizontal polarity. > > Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> > --- > include/hw/s390x/cpu-topology.h | 3 + > include/hw/s390x/s390-virtio-ccw.h | 6 ++ > target/s390x/cpu.h | 1 + > hw/s390x/cpu-topology.c | 92 ++++++++++++++++++++++++++++++ > target/s390x/cpu-sysemu.c | 16 ++++++ > target/s390x/kvm/kvm.c | 11 ++++ > 6 files changed, 129 insertions(+) > > diff --git a/include/hw/s390x/cpu-topology.h b/include/hw/s390x/cpu-topology.h > index 9571aa70e5..33e23d78b9 100644 > --- a/include/hw/s390x/cpu-topology.h > +++ b/include/hw/s390x/cpu-topology.h > @@ -55,11 +55,13 @@ typedef struct S390Topology { > QTAILQ_HEAD(, S390TopologyEntry) list; > uint8_t *sockets; > CpuTopology *smp; > + int polarity; > } S390Topology; > > #ifdef CONFIG_KVM > bool s390_has_topology(void); > void s390_topology_set_cpu(MachineState *ms, S390CPU *cpu, Error **errp); > +void s390_topology_set_polarity(int polarity); > #else > static inline bool s390_has_topology(void) > { > @@ -68,6 +70,7 @@ static inline bool s390_has_topology(void) > static inline void s390_topology_set_cpu(MachineState *ms, > S390CPU *cpu, > Error **errp) {} > +static inline void s390_topology_set_polarity(int polarity) {} > #endif > extern S390Topology s390_topology; > > diff --git a/include/hw/s390x/s390-virtio-ccw.h b/include/hw/s390x/s390-virtio-ccw.h > index 9bba21a916..c1d46e78af 100644 > --- a/include/hw/s390x/s390-virtio-ccw.h > +++ b/include/hw/s390x/s390-virtio-ccw.h > @@ -30,6 +30,12 @@ struct S390CcwMachineState { > uint8_t loadparm[8]; > }; > > +#define S390_PTF_REASON_NONE (0x00 << 8) > +#define S390_PTF_REASON_DONE (0x01 << 8) > +#define S390_PTF_REASON_BUSY (0x02 << 8) > +#define S390_TOPO_FC_MASK 0xffUL > +void s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra); > + > struct S390CcwMachineClass { > /*< private >*/ > MachineClass parent_class; > diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h > index 01ade07009..5da4041576 100644 > --- a/target/s390x/cpu.h > +++ b/target/s390x/cpu.h > @@ -864,6 +864,7 @@ void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg); > int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id, > int vq, bool assign); > void s390_cpu_topology_reset(void); > +void s390_cpu_topology_set(void); I don't like this name much, it's nondescript. s390_cpu_topology_set_modified ? > #ifndef CONFIG_USER_ONLY > unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu); > #else > diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c > index 438055c612..e6b4692581 100644 > --- a/hw/s390x/cpu-topology.c > +++ b/hw/s390x/cpu-topology.c > @@ -97,6 +97,98 @@ static s390_topology_id s390_topology_from_cpu(S390CPU *cpu) > } > > /** > + * s390_topology_set_polarity > + * @polarity: horizontal or vertical > + * > + * Changes the polarity of all the CPU in the configuration. > + * > + * If the dedicated CPU modifier attribute is set a vertical > + * polarization is always high (Architecture). > + * Otherwise we decide to set it as medium. > + * > + * Once done, advertise a topology change. > + */ > +void s390_topology_set_polarity(int polarity) I don't like that this function ignores what kind of vertical polarization is passed, it's confusing. That seems like a further reason to split horizontal/vertical from the entitlement. > +{ > + S390TopologyEntry *entry; I also expected this function to set s390_topology.polarization, but it doesn't. > + > + QTAILQ_FOREACH(entry, &s390_topology.list, next) { > + if (polarity == S390_TOPOLOGY_POLARITY_HORIZONTAL) { > + entry->id.p = polarity; > + } else { > + if (entry->id.d) { > + entry->id.p = S390_TOPOLOGY_POLARITY_VERTICAL_HIGH; > + } else { > + entry->id.p = S390_TOPOLOGY_POLARITY_VERTICAL_MEDIUM; > + } > + } > + } > + s390_cpu_topology_set(); > +} > + > +/* > + * s390_handle_ptf: > + * > + * @register 1: contains the function code > + * > + * Function codes 0 and 1 handle the CPU polarization. > + * We assume an horizontal topology, the only one supported currently > + * by Linux, consequently we answer to function code 0, requesting > + * horizontal polarization that it is already the current polarization > + * and reject vertical polarization request without further explanation. This comment is outdated, right? Same for those in the function body. > + * > + * Function code 2 is handling topology changes and is interpreted > + * by the SIE. > + */ > +void s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra) > +{ > + CPUS390XState *env = &cpu->env; > + uint64_t reg = env->regs[r1]; > + uint8_t fc = reg & S390_TOPO_FC_MASK; > + > + if (!s390_has_feat(S390_FEAT_CONFIGURATION_TOPOLOGY)) { > + s390_program_interrupt(env, PGM_OPERATION, ra); > + return; > + } > + > + if (env->psw.mask & PSW_MASK_PSTATE) { > + s390_program_interrupt(env, PGM_PRIVILEGED, ra); > + return; > + } > + > + if (reg & ~S390_TOPO_FC_MASK) { > + s390_program_interrupt(env, PGM_SPECIFICATION, ra); > + return; > + } > + > + switch (fc) { > + case 0: /* Horizontal polarization is already set */ > + if (s390_topology.polarity == S390_TOPOLOGY_POLARITY_HORIZONTAL) { > + env->regs[r1] |= S390_PTF_REASON_DONE; > + setcc(cpu, 2); > + } else { > + s390_topology_set_polarity(S390_TOPOLOGY_POLARITY_HORIZONTAL); > + s390_topology.polarity = S390_TOPOLOGY_POLARITY_HORIZONTAL; > + setcc(cpu, 0); > + } > + break; > + case 1: /* Vertical polarization is not supported */ > + if (s390_topology.polarity != S390_TOPOLOGY_POLARITY_HORIZONTAL) { > + env->regs[r1] |= S390_PTF_REASON_DONE; > + setcc(cpu, 2); > + } else { > + s390_topology_set_polarity(S390_TOPOLOGY_POLARITY_VERTICAL_LOW); This is why I said it's confusing, nothing gets set to LOW. > + s390_topology.polarity = S390_TOPOLOGY_POLARITY_VERTICAL_LOW; Why LOW here? > + setcc(cpu, 0); > + } > + break; > + default: > + /* Note that fc == 2 is interpreted by the SIE */ > + s390_program_interrupt(env, PGM_SPECIFICATION, ra); > + } You can simplify this by doing: int new_polarity; switch (fc) { case 0: new_polarity = S390_TOPOLOGY_POLARITY_HORIZONTAL; break; case 1: new_polarity = S390_TOPOLOGY_POLARITY_VERTICAL_?; break; default: /* Note that fc == 2 is interpreted by the SIE */ s390_program_interrupt(env, PGM_SPECIFICATION, ra); return; } if same polarity: rc done, rejected else set polarity, initiated Might be a good idea to turn the polarity values into an enum. > +} [...]
On 1/16/23 19:24, Nina Schoetterl-Glausch wrote: > On Thu, 2023-01-05 at 15:53 +0100, Pierre Morel wrote: >> When the host supports the CPU topology facility, the PTF >> instruction with function code 2 is interpreted by the SIE, >> provided that the userland hypervizor activates the interpretation >> by using the KVM_CAP_S390_CPU_TOPOLOGY KVM extension. >> >> The PTF instructions with function code 0 and 1 are intercepted >> and must be emulated by the userland hypervizor. >> >> During RESET all CPU of the configuration are placed in >> horizontal polarity. >> >> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> >> --- >> include/hw/s390x/cpu-topology.h | 3 + >> include/hw/s390x/s390-virtio-ccw.h | 6 ++ >> target/s390x/cpu.h | 1 + >> hw/s390x/cpu-topology.c | 92 ++++++++++++++++++++++++++++++ >> target/s390x/cpu-sysemu.c | 16 ++++++ >> target/s390x/kvm/kvm.c | 11 ++++ >> 6 files changed, 129 insertions(+) >> >> diff --git a/include/hw/s390x/cpu-topology.h b/include/hw/s390x/cpu-topology.h >> index 9571aa70e5..33e23d78b9 100644 >> --- a/include/hw/s390x/cpu-topology.h >> +++ b/include/hw/s390x/cpu-topology.h >> @@ -55,11 +55,13 @@ typedef struct S390Topology { >> QTAILQ_HEAD(, S390TopologyEntry) list; >> uint8_t *sockets; >> CpuTopology *smp; >> + int polarity; >> } S390Topology; >> >> #ifdef CONFIG_KVM >> bool s390_has_topology(void); >> void s390_topology_set_cpu(MachineState *ms, S390CPU *cpu, Error **errp); >> +void s390_topology_set_polarity(int polarity); >> #else >> static inline bool s390_has_topology(void) >> { >> @@ -68,6 +70,7 @@ static inline bool s390_has_topology(void) >> static inline void s390_topology_set_cpu(MachineState *ms, >> S390CPU *cpu, >> Error **errp) {} >> +static inline void s390_topology_set_polarity(int polarity) {} >> #endif >> extern S390Topology s390_topology; >> >> diff --git a/include/hw/s390x/s390-virtio-ccw.h b/include/hw/s390x/s390-virtio-ccw.h >> index 9bba21a916..c1d46e78af 100644 >> --- a/include/hw/s390x/s390-virtio-ccw.h >> +++ b/include/hw/s390x/s390-virtio-ccw.h >> @@ -30,6 +30,12 @@ struct S390CcwMachineState { >> uint8_t loadparm[8]; >> }; >> >> +#define S390_PTF_REASON_NONE (0x00 << 8) >> +#define S390_PTF_REASON_DONE (0x01 << 8) >> +#define S390_PTF_REASON_BUSY (0x02 << 8) >> +#define S390_TOPO_FC_MASK 0xffUL >> +void s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra); >> + >> struct S390CcwMachineClass { >> /*< private >*/ >> MachineClass parent_class; >> diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h >> index 01ade07009..5da4041576 100644 >> --- a/target/s390x/cpu.h >> +++ b/target/s390x/cpu.h >> @@ -864,6 +864,7 @@ void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg); >> int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id, >> int vq, bool assign); >> void s390_cpu_topology_reset(void); >> +void s390_cpu_topology_set(void); > > I don't like this name much, it's nondescript. > s390_cpu_topology_set_modified ? yes, better. > >> #ifndef CONFIG_USER_ONLY >> unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu); >> #else >> diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c >> index 438055c612..e6b4692581 100644 >> --- a/hw/s390x/cpu-topology.c >> +++ b/hw/s390x/cpu-topology.c >> @@ -97,6 +97,98 @@ static s390_topology_id s390_topology_from_cpu(S390CPU *cpu) >> } >> >> /** >> + * s390_topology_set_polarity >> + * @polarity: horizontal or vertical >> + * >> + * Changes the polarity of all the CPU in the configuration. >> + * >> + * If the dedicated CPU modifier attribute is set a vertical >> + * polarization is always high (Architecture). >> + * Otherwise we decide to set it as medium. >> + * >> + * Once done, advertise a topology change. >> + */ >> +void s390_topology_set_polarity(int polarity) > > I don't like that this function ignores what kind of vertical polarization is passed, > it's confusing. > That seems like a further reason to split horizontal/vertical from the entitlement. OK, you are right. I remove this function and put the s390_cpu_topology_set() inside the handle_ptf() > >> +{ >> + S390TopologyEntry *entry; > > I also expected this function to set s390_topology.polarization, but it doesn't. >> + >> + QTAILQ_FOREACH(entry, &s390_topology.list, next) { >> + if (polarity == S390_TOPOLOGY_POLARITY_HORIZONTAL) { >> + entry->id.p = polarity; >> + } else { >> + if (entry->id.d) { >> + entry->id.p = S390_TOPOLOGY_POLARITY_VERTICAL_HIGH; >> + } else { >> + entry->id.p = S390_TOPOLOGY_POLARITY_VERTICAL_MEDIUM; >> + } >> + } >> + } >> + s390_cpu_topology_set(); >> +} >> + >> +/* >> + * s390_handle_ptf: >> + * >> + * @register 1: contains the function code >> + * >> + * Function codes 0 and 1 handle the CPU polarization. >> + * We assume an horizontal topology, the only one supported currently >> + * by Linux, consequently we answer to function code 0, requesting >> + * horizontal polarization that it is already the current polarization >> + * and reject vertical polarization request without further explanation. > > This comment is outdated, right? Same for those in the function body. > >> + * >> + * Function code 2 is handling topology changes and is interpreted >> + * by the SIE. >> + */ >> +void s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra) >> +{ >> + CPUS390XState *env = &cpu->env; >> + uint64_t reg = env->regs[r1]; >> + uint8_t fc = reg & S390_TOPO_FC_MASK; >> + >> + if (!s390_has_feat(S390_FEAT_CONFIGURATION_TOPOLOGY)) { >> + s390_program_interrupt(env, PGM_OPERATION, ra); >> + return; >> + } >> + >> + if (env->psw.mask & PSW_MASK_PSTATE) { >> + s390_program_interrupt(env, PGM_PRIVILEGED, ra); >> + return; >> + } >> + >> + if (reg & ~S390_TOPO_FC_MASK) { >> + s390_program_interrupt(env, PGM_SPECIFICATION, ra); >> + return; >> + } >> + >> + switch (fc) { >> + case 0: /* Horizontal polarization is already set */ >> + if (s390_topology.polarity == S390_TOPOLOGY_POLARITY_HORIZONTAL) { >> + env->regs[r1] |= S390_PTF_REASON_DONE; >> + setcc(cpu, 2); >> + } else { >> + s390_topology_set_polarity(S390_TOPOLOGY_POLARITY_HORIZONTAL); >> + s390_topology.polarity = S390_TOPOLOGY_POLARITY_HORIZONTAL; >> + setcc(cpu, 0); >> + } >> + break; >> + case 1: /* Vertical polarization is not supported */ >> + if (s390_topology.polarity != S390_TOPOLOGY_POLARITY_HORIZONTAL) { >> + env->regs[r1] |= S390_PTF_REASON_DONE; >> + setcc(cpu, 2); >> + } else { >> + s390_topology_set_polarity(S390_TOPOLOGY_POLARITY_VERTICAL_LOW); > > This is why I said it's confusing, nothing gets set to LOW. > >> + s390_topology.polarity = S390_TOPOLOGY_POLARITY_VERTICAL_LOW; > > Why LOW here? I wanted something not being S390_TOPOLOGY_POLARITY_HORIZONTAL and did not want to define a S390_TOPOLOGY_POLARITY_VERTICAL. OK I define S390_TOPOLOGY_POLARITY_HORIZONTAL=0 and ..._VERTICAL=1 > >> + setcc(cpu, 0); >> + } >> + break; >> + default: >> + /* Note that fc == 2 is interpreted by the SIE */ >> + s390_program_interrupt(env, PGM_SPECIFICATION, ra); >> + } > > You can simplify this by doing: > > int new_polarity; > switch (fc) { > case 0: > new_polarity = S390_TOPOLOGY_POLARITY_HORIZONTAL; > break; > case 1: > new_polarity = S390_TOPOLOGY_POLARITY_VERTICAL_?; > break; > default: > /* Note that fc == 2 is interpreted by the SIE */ > s390_program_interrupt(env, PGM_SPECIFICATION, ra); > return; > } > > if same polarity: > rc done, rejected > else > set polarity, initiated > > Might be a good idea to turn the polarity values into an enum. > >> +} > [...] > Even I never really understood the added value of an enum I can do this. Thanks, regards, Pierre
On 1/16/23 19:24, Nina Schoetterl-Glausch wrote: > On Thu, 2023-01-05 at 15:53 +0100, Pierre Morel wrote: >> When the host supports the CPU topology facility, the PTF >> instruction with function code 2 is interpreted by the SIE, >> provided that the userland hypervizor activates the interpretation >> by using the KVM_CAP_S390_CPU_TOPOLOGY KVM extension. >> >> The PTF instructions with function code 0 and 1 are intercepted >> and must be emulated by the userland hypervizor. >> >> During RESET all CPU of the configuration are placed in >> horizontal polarity. >> >> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> >> --- >> include/hw/s390x/cpu-topology.h | 3 + >> include/hw/s390x/s390-virtio-ccw.h | 6 ++ >> target/s390x/cpu.h | 1 + >> hw/s390x/cpu-topology.c | 92 ++++++++++++++++++++++++++++++ >> target/s390x/cpu-sysemu.c | 16 ++++++ >> target/s390x/kvm/kvm.c | 11 ++++ >> 6 files changed, 129 insertions(+) >> >> diff --git a/include/hw/s390x/cpu-topology.h b/include/hw/s390x/cpu-topology.h >> index 9571aa70e5..33e23d78b9 100644 >> --- a/include/hw/s390x/cpu-topology.h >> +++ b/include/hw/s390x/cpu-topology.h >> @@ -55,11 +55,13 @@ typedef struct S390Topology { >> QTAILQ_HEAD(, S390TopologyEntry) list; >> uint8_t *sockets; >> CpuTopology *smp; >> + int polarity; >> } S390Topology; >> >> #ifdef CONFIG_KVM >> bool s390_has_topology(void); >> void s390_topology_set_cpu(MachineState *ms, S390CPU *cpu, Error **errp); >> +void s390_topology_set_polarity(int polarity); >> #else >> static inline bool s390_has_topology(void) >> { >> @@ -68,6 +70,7 @@ static inline bool s390_has_topology(void) >> static inline void s390_topology_set_cpu(MachineState *ms, >> S390CPU *cpu, >> Error **errp) {} >> +static inline void s390_topology_set_polarity(int polarity) {} >> #endif >> extern S390Topology s390_topology; >> >> diff --git a/include/hw/s390x/s390-virtio-ccw.h b/include/hw/s390x/s390-virtio-ccw.h >> index 9bba21a916..c1d46e78af 100644 >> --- a/include/hw/s390x/s390-virtio-ccw.h >> +++ b/include/hw/s390x/s390-virtio-ccw.h >> @@ -30,6 +30,12 @@ struct S390CcwMachineState { >> uint8_t loadparm[8]; >> }; >> >> +#define S390_PTF_REASON_NONE (0x00 << 8) >> +#define S390_PTF_REASON_DONE (0x01 << 8) >> +#define S390_PTF_REASON_BUSY (0x02 << 8) >> +#define S390_TOPO_FC_MASK 0xffUL >> +void s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra); >> + >> struct S390CcwMachineClass { >> /*< private >*/ >> MachineClass parent_class; >> diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h >> index 01ade07009..5da4041576 100644 >> --- a/target/s390x/cpu.h >> +++ b/target/s390x/cpu.h >> @@ -864,6 +864,7 @@ void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg); >> int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id, >> int vq, bool assign); >> void s390_cpu_topology_reset(void); >> +void s390_cpu_topology_set(void); > > I don't like this name much, it's nondescript. > s390_cpu_topology_set_modified ? > >> #ifndef CONFIG_USER_ONLY >> unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu); >> #else >> diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c >> index 438055c612..e6b4692581 100644 >> --- a/hw/s390x/cpu-topology.c >> +++ b/hw/s390x/cpu-topology.c >> @@ -97,6 +97,98 @@ static s390_topology_id s390_topology_from_cpu(S390CPU *cpu) >> } >> >> /** >> + * s390_topology_set_polarity >> + * @polarity: horizontal or vertical >> + * >> + * Changes the polarity of all the CPU in the configuration. >> + * >> + * If the dedicated CPU modifier attribute is set a vertical >> + * polarization is always high (Architecture). >> + * Otherwise we decide to set it as medium. >> + * >> + * Once done, advertise a topology change. >> + */ >> +void s390_topology_set_polarity(int polarity) > > I don't like that this function ignores what kind of vertical polarization is passed, > it's confusing. > That seems like a further reason to split horizontal/vertical from the entitlement. > Yes. I will also make the ordering of the TLE at the last moment instead of doing it during hotplug or QAPI command. This is something Cedric proposed some time ago and I think it is right, it will be easier to do it once in STSI than on every change of topology, hotplug, QAPI and polarization change with PTF. Regards, Pierre
diff --git a/include/hw/s390x/cpu-topology.h b/include/hw/s390x/cpu-topology.h index 9571aa70e5..33e23d78b9 100644 --- a/include/hw/s390x/cpu-topology.h +++ b/include/hw/s390x/cpu-topology.h @@ -55,11 +55,13 @@ typedef struct S390Topology { QTAILQ_HEAD(, S390TopologyEntry) list; uint8_t *sockets; CpuTopology *smp; + int polarity; } S390Topology; #ifdef CONFIG_KVM bool s390_has_topology(void); void s390_topology_set_cpu(MachineState *ms, S390CPU *cpu, Error **errp); +void s390_topology_set_polarity(int polarity); #else static inline bool s390_has_topology(void) { @@ -68,6 +70,7 @@ static inline bool s390_has_topology(void) static inline void s390_topology_set_cpu(MachineState *ms, S390CPU *cpu, Error **errp) {} +static inline void s390_topology_set_polarity(int polarity) {} #endif extern S390Topology s390_topology; diff --git a/include/hw/s390x/s390-virtio-ccw.h b/include/hw/s390x/s390-virtio-ccw.h index 9bba21a916..c1d46e78af 100644 --- a/include/hw/s390x/s390-virtio-ccw.h +++ b/include/hw/s390x/s390-virtio-ccw.h @@ -30,6 +30,12 @@ struct S390CcwMachineState { uint8_t loadparm[8]; }; +#define S390_PTF_REASON_NONE (0x00 << 8) +#define S390_PTF_REASON_DONE (0x01 << 8) +#define S390_PTF_REASON_BUSY (0x02 << 8) +#define S390_TOPO_FC_MASK 0xffUL +void s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra); + struct S390CcwMachineClass { /*< private >*/ MachineClass parent_class; diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h index 01ade07009..5da4041576 100644 --- a/target/s390x/cpu.h +++ b/target/s390x/cpu.h @@ -864,6 +864,7 @@ void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg); int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id, int vq, bool assign); void s390_cpu_topology_reset(void); +void s390_cpu_topology_set(void); #ifndef CONFIG_USER_ONLY unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu); #else diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c index 438055c612..e6b4692581 100644 --- a/hw/s390x/cpu-topology.c +++ b/hw/s390x/cpu-topology.c @@ -97,6 +97,98 @@ static s390_topology_id s390_topology_from_cpu(S390CPU *cpu) } /** + * s390_topology_set_polarity + * @polarity: horizontal or vertical + * + * Changes the polarity of all the CPU in the configuration. + * + * If the dedicated CPU modifier attribute is set a vertical + * polarization is always high (Architecture). + * Otherwise we decide to set it as medium. + * + * Once done, advertise a topology change. + */ +void s390_topology_set_polarity(int polarity) +{ + S390TopologyEntry *entry; + + QTAILQ_FOREACH(entry, &s390_topology.list, next) { + if (polarity == S390_TOPOLOGY_POLARITY_HORIZONTAL) { + entry->id.p = polarity; + } else { + if (entry->id.d) { + entry->id.p = S390_TOPOLOGY_POLARITY_VERTICAL_HIGH; + } else { + entry->id.p = S390_TOPOLOGY_POLARITY_VERTICAL_MEDIUM; + } + } + } + s390_cpu_topology_set(); +} + +/* + * s390_handle_ptf: + * + * @register 1: contains the function code + * + * Function codes 0 and 1 handle the CPU polarization. + * We assume an horizontal topology, the only one supported currently + * by Linux, consequently we answer to function code 0, requesting + * horizontal polarization that it is already the current polarization + * and reject vertical polarization request without further explanation. + * + * Function code 2 is handling topology changes and is interpreted + * by the SIE. + */ +void s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra) +{ + CPUS390XState *env = &cpu->env; + uint64_t reg = env->regs[r1]; + uint8_t fc = reg & S390_TOPO_FC_MASK; + + if (!s390_has_feat(S390_FEAT_CONFIGURATION_TOPOLOGY)) { + s390_program_interrupt(env, PGM_OPERATION, ra); + return; + } + + if (env->psw.mask & PSW_MASK_PSTATE) { + s390_program_interrupt(env, PGM_PRIVILEGED, ra); + return; + } + + if (reg & ~S390_TOPO_FC_MASK) { + s390_program_interrupt(env, PGM_SPECIFICATION, ra); + return; + } + + switch (fc) { + case 0: /* Horizontal polarization is already set */ + if (s390_topology.polarity == S390_TOPOLOGY_POLARITY_HORIZONTAL) { + env->regs[r1] |= S390_PTF_REASON_DONE; + setcc(cpu, 2); + } else { + s390_topology_set_polarity(S390_TOPOLOGY_POLARITY_HORIZONTAL); + s390_topology.polarity = S390_TOPOLOGY_POLARITY_HORIZONTAL; + setcc(cpu, 0); + } + break; + case 1: /* Vertical polarization is not supported */ + if (s390_topology.polarity != S390_TOPOLOGY_POLARITY_HORIZONTAL) { + env->regs[r1] |= S390_PTF_REASON_DONE; + setcc(cpu, 2); + } else { + s390_topology_set_polarity(S390_TOPOLOGY_POLARITY_VERTICAL_LOW); + s390_topology.polarity = S390_TOPOLOGY_POLARITY_VERTICAL_LOW; + setcc(cpu, 0); + } + break; + default: + /* Note that fc == 2 is interpreted by the SIE */ + s390_program_interrupt(env, PGM_SPECIFICATION, ra); + } +} + + /** * s390_topology_set_entry: * @entry: Topology entry to setup * @id: topology id to use for the setup diff --git a/target/s390x/cpu-sysemu.c b/target/s390x/cpu-sysemu.c index e27864c5f5..8643320947 100644 --- a/target/s390x/cpu-sysemu.c +++ b/target/s390x/cpu-sysemu.c @@ -37,6 +37,7 @@ #include "sysemu/sysemu.h" #include "sysemu/tcg.h" #include "hw/core/sysemu-cpu-ops.h" +#include "hw/s390x/cpu-topology.h" /* S390CPUClass::load_normal() */ static void s390_cpu_load_normal(CPUState *s) @@ -311,6 +312,8 @@ void s390_cpu_topology_reset(void) { int ret; + s390_topology_set_polarity(S390_TOPOLOGY_POLARITY_HORIZONTAL); + if (kvm_enabled()) { ret = kvm_s390_topology_set_mtcr(0); if (ret) { @@ -319,3 +322,16 @@ void s390_cpu_topology_reset(void) } } } + +void s390_cpu_topology_set(void) +{ + int ret; + + if (kvm_enabled()) { + ret = kvm_s390_topology_set_mtcr(1); + if (ret) { + error_report("Failed to set Modified Topology Change Report: %s", + strerror(-ret)); + } + } +} diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c index bc953151ce..fb63be41b7 100644 --- a/target/s390x/kvm/kvm.c +++ b/target/s390x/kvm/kvm.c @@ -96,6 +96,7 @@ #define PRIV_B9_EQBS 0x9c #define PRIV_B9_CLP 0xa0 +#define PRIV_B9_PTF 0xa2 #define PRIV_B9_PCISTG 0xd0 #define PRIV_B9_PCILG 0xd2 #define PRIV_B9_RPCIT 0xd3 @@ -1464,6 +1465,13 @@ static int kvm_mpcifc_service_call(S390CPU *cpu, struct kvm_run *run) } } +static void kvm_handle_ptf(S390CPU *cpu, struct kvm_run *run) +{ + uint8_t r1 = (run->s390_sieic.ipb >> 20) & 0x0f; + + s390_handle_ptf(cpu, r1, RA_IGNORED); +} + static int handle_b9(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1) { int r = 0; @@ -1481,6 +1489,9 @@ static int handle_b9(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1) case PRIV_B9_RPCIT: r = kvm_rpcit_service_call(cpu, run); break; + case PRIV_B9_PTF: + kvm_handle_ptf(cpu, run); + break; case PRIV_B9_EQBS: /* just inject exception */ r = -1;
When the host supports the CPU topology facility, the PTF instruction with function code 2 is interpreted by the SIE, provided that the userland hypervizor activates the interpretation by using the KVM_CAP_S390_CPU_TOPOLOGY KVM extension. The PTF instructions with function code 0 and 1 are intercepted and must be emulated by the userland hypervizor. During RESET all CPU of the configuration are placed in horizontal polarity. Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> --- include/hw/s390x/cpu-topology.h | 3 + include/hw/s390x/s390-virtio-ccw.h | 6 ++ target/s390x/cpu.h | 1 + hw/s390x/cpu-topology.c | 92 ++++++++++++++++++++++++++++++ target/s390x/cpu-sysemu.c | 16 ++++++ target/s390x/kvm/kvm.c | 11 ++++ 6 files changed, 129 insertions(+)