| Message ID | 20200309112206.20261-9-frankja@linux.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | s390x: Protected Virtualization support | expand |
On 09.03.20 12:21, Janosch Frank wrote: > SCLP for a protected guest is done over the SIDAD, so we need to use > the s390_cpu_pv_mem_* functions to access the SIDAD instead of guest > memory when reading/writing SCBs. > > To not confuse the sclp emulation, we set 0x4000 as the SCCB address, > since the function that injects the sclp external interrupt would > reject a zero sccb address. > > Signed-off-by: Janosch Frank <frankja@linux.ibm.com> > --- > hw/s390x/sclp.c | 28 ++++++++++++++++++++++++++++ > include/hw/s390x/sclp.h | 2 ++ > target/s390x/kvm.c | 21 ++++++++++++++++----- > 3 files changed, 46 insertions(+), 5 deletions(-) > > diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c > index af0bfbc2ec..b4bc2dd659 100644 > --- a/hw/s390x/sclp.c > +++ b/hw/s390x/sclp.c > @@ -193,6 +193,34 @@ static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code) > } > } > > +/* > +* We only need the address to have something valid for the > +* service_interrupt call. > +*/ > +#define SCLP_PV_DUMMY_ADDR 0x4000 > +int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb, > + uint32_t code) > +{ > + SCLPDevice *sclp = get_sclp_device(); > + SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); > + SCCB work_sccb; > + hwaddr sccb_len = sizeof(SCCB); > + > + /* > + * Only a very limited amount of calls is permitted by the > + * Ultravisor and we support all of them, so we don't check for > + * them. All other specification exceptions are also interpreted > + * by the Ultravisor and hence never cause an exit we need to > + * handle. > + */ > + s390_cpu_pv_mem_read(env_archcpu(env), 0, &work_sccb, sccb_len); > + sclp_c->execute(sclp, &work_sccb, code); > + s390_cpu_pv_mem_write(env_archcpu(env), 0, &work_sccb, > + be16_to_cpu(work_sccb.h.length)); > + sclp_c->service_interrupt(sclp, SCLP_PV_DUMMY_ADDR); > + return 0; > +} > + > int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code) > { > SCLPDevice *sclp = get_sclp_device(); > diff --git a/include/hw/s390x/sclp.h b/include/hw/s390x/sclp.h > index c54413b78c..c0a3faa37d 100644 > --- a/include/hw/s390x/sclp.h > +++ b/include/hw/s390x/sclp.h > @@ -217,5 +217,7 @@ void s390_sclp_init(void); > void sclp_service_interrupt(uint32_t sccb); > void raise_irq_cpu_hotplug(void); > int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code); > +int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb, > + uint32_t code); > > #endif > diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c > index 295ed12a38..5c7757ac28 100644 > --- a/target/s390x/kvm.c > +++ b/target/s390x/kvm.c > @@ -1226,12 +1226,23 @@ static void kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run, > sccb = env->regs[ipbh0 & 0xf]; > code = env->regs[(ipbh0 & 0xf0) >> 4]; > > - r = sclp_service_call(env, sccb, code); > - if (r < 0) { > - kvm_s390_program_interrupt(cpu, -r); > - return; > + switch (run->s390_sieic.icptcode) { > + case ICPT_PV_INSTR_NOTIFICATION: > + /* The notification intercepts are currently handled by KVM */ > + fprintf(stderr, "unexpected SCLP PV notification\n"); Maybe g_assert(env->pv); error_report() ? > + exit(1); > + break; > + case ICPT_PV_INSTR: > + sclp_service_call_protected(env, sccb, code); > + break; > + case ICPT_INSTRUCTION: Maybe g_assert(!env->pv); > + r = sclp_service_call(env, sccb, code); > + if (r < 0) { > + kvm_s390_program_interrupt(cpu, -r); > + return; > + } > + setcc(cpu, r); > } > - setcc(cpu, r); What about the cc in case of ICPT_PV_INSTR? > } > > static int handle_b2(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1) >
On 3/9/20 4:27 PM, David Hildenbrand wrote: > On 09.03.20 12:21, Janosch Frank wrote: >> SCLP for a protected guest is done over the SIDAD, so we need to use >> the s390_cpu_pv_mem_* functions to access the SIDAD instead of guest >> memory when reading/writing SCBs. >> >> To not confuse the sclp emulation, we set 0x4000 as the SCCB address, >> since the function that injects the sclp external interrupt would >> reject a zero sccb address. >> >> Signed-off-by: Janosch Frank <frankja@linux.ibm.com> >> --- >> hw/s390x/sclp.c | 28 ++++++++++++++++++++++++++++ >> include/hw/s390x/sclp.h | 2 ++ >> target/s390x/kvm.c | 21 ++++++++++++++++----- >> 3 files changed, 46 insertions(+), 5 deletions(-) >> >> diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c >> index af0bfbc2ec..b4bc2dd659 100644 >> --- a/hw/s390x/sclp.c >> +++ b/hw/s390x/sclp.c >> @@ -193,6 +193,34 @@ static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code) >> } >> } >> >> +/* >> +* We only need the address to have something valid for the >> +* service_interrupt call. >> +*/ >> +#define SCLP_PV_DUMMY_ADDR 0x4000 >> +int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb, >> + uint32_t code) >> +{ >> + SCLPDevice *sclp = get_sclp_device(); >> + SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); >> + SCCB work_sccb; >> + hwaddr sccb_len = sizeof(SCCB); >> + >> + /* >> + * Only a very limited amount of calls is permitted by the >> + * Ultravisor and we support all of them, so we don't check for >> + * them. All other specification exceptions are also interpreted >> + * by the Ultravisor and hence never cause an exit we need to >> + * handle. >> + */ >> + s390_cpu_pv_mem_read(env_archcpu(env), 0, &work_sccb, sccb_len); >> + sclp_c->execute(sclp, &work_sccb, code); >> + s390_cpu_pv_mem_write(env_archcpu(env), 0, &work_sccb, >> + be16_to_cpu(work_sccb.h.length)); >> + sclp_c->service_interrupt(sclp, SCLP_PV_DUMMY_ADDR); >> + return 0; >> +} >> + >> int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code) >> { >> SCLPDevice *sclp = get_sclp_device(); >> diff --git a/include/hw/s390x/sclp.h b/include/hw/s390x/sclp.h >> index c54413b78c..c0a3faa37d 100644 >> --- a/include/hw/s390x/sclp.h >> +++ b/include/hw/s390x/sclp.h >> @@ -217,5 +217,7 @@ void s390_sclp_init(void); >> void sclp_service_interrupt(uint32_t sccb); >> void raise_irq_cpu_hotplug(void); >> int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code); >> +int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb, >> + uint32_t code); >> >> #endif >> diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c >> index 295ed12a38..5c7757ac28 100644 >> --- a/target/s390x/kvm.c >> +++ b/target/s390x/kvm.c >> @@ -1226,12 +1226,23 @@ static void kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run, >> sccb = env->regs[ipbh0 & 0xf]; >> code = env->regs[(ipbh0 & 0xf0) >> 4]; >> >> - r = sclp_service_call(env, sccb, code); >> - if (r < 0) { >> - kvm_s390_program_interrupt(cpu, -r); >> - return; >> + switch (run->s390_sieic.icptcode) { >> + case ICPT_PV_INSTR_NOTIFICATION: >> + /* The notification intercepts are currently handled by KVM */ >> + fprintf(stderr, "unexpected SCLP PV notification\n"); > > Maybe g_assert(env->pv); > > error_report() ? Sure, I just followed suit with the other aborts in this file. > >> + exit(1); >> + break; >> + case ICPT_PV_INSTR: >> + sclp_service_call_protected(env, sccb, code); >> + break; >> + case ICPT_INSTRUCTION: > > Maybe g_assert(!env->pv); > >> + r = sclp_service_call(env, sccb, code); >> + if (r < 0) { >> + kvm_s390_program_interrupt(cpu, -r); >> + return; >> + } >> + setcc(cpu, r); >> } >> - setcc(cpu, r); > > What about the cc in case of ICPT_PV_INSTR? Set to 0 by the Ultravisor/SIE > >> } >> >> static int handle_b2(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1) >> > >
diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c index af0bfbc2ec..b4bc2dd659 100644 --- a/hw/s390x/sclp.c +++ b/hw/s390x/sclp.c @@ -193,6 +193,34 @@ static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code) } } +/* +* We only need the address to have something valid for the +* service_interrupt call. +*/ +#define SCLP_PV_DUMMY_ADDR 0x4000 +int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb, + uint32_t code) +{ + SCLPDevice *sclp = get_sclp_device(); + SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); + SCCB work_sccb; + hwaddr sccb_len = sizeof(SCCB); + + /* + * Only a very limited amount of calls is permitted by the + * Ultravisor and we support all of them, so we don't check for + * them. All other specification exceptions are also interpreted + * by the Ultravisor and hence never cause an exit we need to + * handle. + */ + s390_cpu_pv_mem_read(env_archcpu(env), 0, &work_sccb, sccb_len); + sclp_c->execute(sclp, &work_sccb, code); + s390_cpu_pv_mem_write(env_archcpu(env), 0, &work_sccb, + be16_to_cpu(work_sccb.h.length)); + sclp_c->service_interrupt(sclp, SCLP_PV_DUMMY_ADDR); + return 0; +} + int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code) { SCLPDevice *sclp = get_sclp_device(); diff --git a/include/hw/s390x/sclp.h b/include/hw/s390x/sclp.h index c54413b78c..c0a3faa37d 100644 --- a/include/hw/s390x/sclp.h +++ b/include/hw/s390x/sclp.h @@ -217,5 +217,7 @@ void s390_sclp_init(void); void sclp_service_interrupt(uint32_t sccb); void raise_irq_cpu_hotplug(void); int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code); +int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb, + uint32_t code); #endif diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c index 295ed12a38..5c7757ac28 100644 --- a/target/s390x/kvm.c +++ b/target/s390x/kvm.c @@ -1226,12 +1226,23 @@ static void kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run, sccb = env->regs[ipbh0 & 0xf]; code = env->regs[(ipbh0 & 0xf0) >> 4]; - r = sclp_service_call(env, sccb, code); - if (r < 0) { - kvm_s390_program_interrupt(cpu, -r); - return; + switch (run->s390_sieic.icptcode) { + case ICPT_PV_INSTR_NOTIFICATION: + /* The notification intercepts are currently handled by KVM */ + fprintf(stderr, "unexpected SCLP PV notification\n"); + exit(1); + break; + case ICPT_PV_INSTR: + sclp_service_call_protected(env, sccb, code); + break; + case ICPT_INSTRUCTION: + r = sclp_service_call(env, sccb, code); + if (r < 0) { + kvm_s390_program_interrupt(cpu, -r); + return; + } + setcc(cpu, r); } - setcc(cpu, r); } static int handle_b2(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
SCLP for a protected guest is done over the SIDAD, so we need to use the s390_cpu_pv_mem_* functions to access the SIDAD instead of guest memory when reading/writing SCBs. To not confuse the sclp emulation, we set 0x4000 as the SCCB address, since the function that injects the sclp external interrupt would reject a zero sccb address. Signed-off-by: Janosch Frank <frankja@linux.ibm.com> --- hw/s390x/sclp.c | 28 ++++++++++++++++++++++++++++ include/hw/s390x/sclp.h | 2 ++ target/s390x/kvm.c | 21 ++++++++++++++++----- 3 files changed, 46 insertions(+), 5 deletions(-)