| Message ID | 20191122140002.42972-5-frankja@linux.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | s390x: Reset cleanup | expand |
On 22.11.19 15:00, Janosch Frank wrote: > Let's also move the clear reset function into the reset handler. > > Signed-off-by: Janosch Frank <frankja@linux.ibm.com> > --- > target/s390x/cpu-qom.h | 1 + > target/s390x/cpu.c | 50 ++++++++---------------------------------- > 2 files changed, 10 insertions(+), 41 deletions(-) > > diff --git a/target/s390x/cpu-qom.h b/target/s390x/cpu-qom.h > index 6f0a12042e..dbe5346ec9 100644 > --- a/target/s390x/cpu-qom.h > +++ b/target/s390x/cpu-qom.h > @@ -37,6 +37,7 @@ typedef struct S390CPUDef S390CPUDef; > typedef enum cpu_reset_type { > S390_CPU_RESET_NORMAL, > S390_CPU_RESET_INITIAL, > + S390_CPU_RESET_CLEAR, > } cpu_reset_type; > > /** > diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c > index 1f423fb676..017181fe4a 100644 > --- a/target/s390x/cpu.c > +++ b/target/s390x/cpu.c > @@ -94,6 +94,9 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type) > s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); > > switch (type) { > + case S390_CPU_RESET_CLEAR: > + memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields)); I think the preferred term in QEMU is "fall through". > + /* Fallthrough */ > case S390_CPU_RESET_INITIAL: > /* initial reset does not clear everything! */ > memset(&env->start_initial_reset_fields, 0, > @@ -121,46 +124,6 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type) > } > } > > -/* CPUClass:reset() */ > -static void s390_cpu_full_reset(CPUState *s) > -{ > - S390CPU *cpu = S390_CPU(s); > - S390CPUClass *scc = S390_CPU_GET_CLASS(cpu); > - CPUS390XState *env = &cpu->env; > - > - scc->parent_reset(s); > - cpu->env.sigp_order = 0; > - s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); > - > - memset(env, 0, offsetof(CPUS390XState, end_reset_fields)); > - > - /* architectured initial values for CR 0 and 14 */ > - env->cregs[0] = CR0_RESET; > - env->cregs[14] = CR14_RESET; > - > -#if defined(CONFIG_USER_ONLY) > - /* user mode should always be allowed to use the full FPU */ > - env->cregs[0] |= CR0_AFP; > - if (s390_has_feat(S390_FEAT_VECTOR)) { > - env->cregs[0] |= CR0_VECTOR; > - } > -#endif Huh, what happened to that change? Note that we now also do "env->bpbc = false" - is that ok?
On 11/22/19 3:30 PM, David Hildenbrand wrote: > On 22.11.19 15:00, Janosch Frank wrote: >> Let's also move the clear reset function into the reset handler. >> >> Signed-off-by: Janosch Frank <frankja@linux.ibm.com> >> --- >> target/s390x/cpu-qom.h | 1 + >> target/s390x/cpu.c | 50 ++++++++---------------------------------- >> 2 files changed, 10 insertions(+), 41 deletions(-) >> >> diff --git a/target/s390x/cpu-qom.h b/target/s390x/cpu-qom.h >> index 6f0a12042e..dbe5346ec9 100644 >> --- a/target/s390x/cpu-qom.h >> +++ b/target/s390x/cpu-qom.h >> @@ -37,6 +37,7 @@ typedef struct S390CPUDef S390CPUDef; >> typedef enum cpu_reset_type { >> S390_CPU_RESET_NORMAL, >> S390_CPU_RESET_INITIAL, >> + S390_CPU_RESET_CLEAR, >> } cpu_reset_type; >> >> /** >> diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c >> index 1f423fb676..017181fe4a 100644 >> --- a/target/s390x/cpu.c >> +++ b/target/s390x/cpu.c >> @@ -94,6 +94,9 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type) >> s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); >> >> switch (type) { >> + case S390_CPU_RESET_CLEAR: >> + memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields)); > > I think the preferred term in QEMU is "fall through". > >> + /* Fallthrough */ >> case S390_CPU_RESET_INITIAL: >> /* initial reset does not clear everything! */ >> memset(&env->start_initial_reset_fields, 0, >> @@ -121,46 +124,6 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type) >> } >> } >> >> -/* CPUClass:reset() */ >> -static void s390_cpu_full_reset(CPUState *s) >> -{ >> - S390CPU *cpu = S390_CPU(s); >> - S390CPUClass *scc = S390_CPU_GET_CLASS(cpu); >> - CPUS390XState *env = &cpu->env; >> - >> - scc->parent_reset(s); >> - cpu->env.sigp_order = 0; >> - s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); >> - >> - memset(env, 0, offsetof(CPUS390XState, end_reset_fields)); >> - >> - /* architectured initial values for CR 0 and 14 */ >> - env->cregs[0] = CR0_RESET; >> - env->cregs[14] = CR14_RESET; >> - >> -#if defined(CONFIG_USER_ONLY) >> - /* user mode should always be allowed to use the full FPU */ >> - env->cregs[0] |= CR0_AFP; >> - if (s390_has_feat(S390_FEAT_VECTOR)) { >> - env->cregs[0] |= CR0_VECTOR; >> - } >> -#endif > > Huh, what happened to that change? Seems like I missed it > > Note that we now also do "env->bpbc = false" - is that ok? That's ok, clear and initial reset do a memset to bpbc, but as reset normal doesn't we need to set it explicitly.
On 11/22/19 3:30 PM, David Hildenbrand wrote: > On 22.11.19 15:00, Janosch Frank wrote: >> Let's also move the clear reset function into the reset handler. >> >> Signed-off-by: Janosch Frank <frankja@linux.ibm.com> >> --- >> target/s390x/cpu-qom.h | 1 + >> target/s390x/cpu.c | 50 ++++++++---------------------------------- >> 2 files changed, 10 insertions(+), 41 deletions(-) >> >> diff --git a/target/s390x/cpu-qom.h b/target/s390x/cpu-qom.h >> index 6f0a12042e..dbe5346ec9 100644 >> --- a/target/s390x/cpu-qom.h >> +++ b/target/s390x/cpu-qom.h >> @@ -37,6 +37,7 @@ typedef struct S390CPUDef S390CPUDef; >> typedef enum cpu_reset_type { >> S390_CPU_RESET_NORMAL, >> S390_CPU_RESET_INITIAL, >> + S390_CPU_RESET_CLEAR, >> } cpu_reset_type; >> >> /** >> diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c >> index 1f423fb676..017181fe4a 100644 >> --- a/target/s390x/cpu.c >> +++ b/target/s390x/cpu.c >> @@ -94,6 +94,9 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type) >> s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); >> >> switch (type) { >> + case S390_CPU_RESET_CLEAR: >> + memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields)); > > I think the preferred term in QEMU is "fall through". > >> + /* Fallthrough */ >> case S390_CPU_RESET_INITIAL: >> /* initial reset does not clear everything! */ >> memset(&env->start_initial_reset_fields, 0, >> @@ -121,46 +124,6 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type) >> } >> } >> >> -/* CPUClass:reset() */ >> -static void s390_cpu_full_reset(CPUState *s) >> -{ >> - S390CPU *cpu = S390_CPU(s); >> - S390CPUClass *scc = S390_CPU_GET_CLASS(cpu); >> - CPUS390XState *env = &cpu->env; >> - >> - scc->parent_reset(s); >> - cpu->env.sigp_order = 0; >> - s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); >> - >> - memset(env, 0, offsetof(CPUS390XState, end_reset_fields)); >> - >> - /* architectured initial values for CR 0 and 14 */ >> - env->cregs[0] = CR0_RESET; >> - env->cregs[14] = CR14_RESET; >> - >> -#if defined(CONFIG_USER_ONLY) >> - /* user mode should always be allowed to use the full FPU */ >> - env->cregs[0] |= CR0_AFP; >> - if (s390_has_feat(S390_FEAT_VECTOR)) { >> - env->cregs[0] |= CR0_VECTOR; >> - } >> -#endif > > Huh, what happened to that change? Btw., wouldn't we need that for both initial and clear reset? > > Note that we now also do "env->bpbc = false" - is that ok? >
On 22.11.19 18:15, Janosch Frank wrote: > On 11/22/19 3:30 PM, David Hildenbrand wrote: >> On 22.11.19 15:00, Janosch Frank wrote: >>> Let's also move the clear reset function into the reset handler. >>> >>> Signed-off-by: Janosch Frank <frankja@linux.ibm.com> >>> --- >>> target/s390x/cpu-qom.h | 1 + >>> target/s390x/cpu.c | 50 ++++++++---------------------------------- >>> 2 files changed, 10 insertions(+), 41 deletions(-) >>> >>> diff --git a/target/s390x/cpu-qom.h b/target/s390x/cpu-qom.h >>> index 6f0a12042e..dbe5346ec9 100644 >>> --- a/target/s390x/cpu-qom.h >>> +++ b/target/s390x/cpu-qom.h >>> @@ -37,6 +37,7 @@ typedef struct S390CPUDef S390CPUDef; >>> typedef enum cpu_reset_type { >>> S390_CPU_RESET_NORMAL, >>> S390_CPU_RESET_INITIAL, >>> + S390_CPU_RESET_CLEAR, >>> } cpu_reset_type; >>> >>> /** >>> diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c >>> index 1f423fb676..017181fe4a 100644 >>> --- a/target/s390x/cpu.c >>> +++ b/target/s390x/cpu.c >>> @@ -94,6 +94,9 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type) >>> s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); >>> >>> switch (type) { >>> + case S390_CPU_RESET_CLEAR: >>> + memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields)); >> >> I think the preferred term in QEMU is "fall through". >> >>> + /* Fallthrough */ >>> case S390_CPU_RESET_INITIAL: >>> /* initial reset does not clear everything! */ >>> memset(&env->start_initial_reset_fields, 0, >>> @@ -121,46 +124,6 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type) >>> } >>> } >>> >>> -/* CPUClass:reset() */ >>> -static void s390_cpu_full_reset(CPUState *s) >>> -{ >>> - S390CPU *cpu = S390_CPU(s); >>> - S390CPUClass *scc = S390_CPU_GET_CLASS(cpu); >>> - CPUS390XState *env = &cpu->env; >>> - >>> - scc->parent_reset(s); >>> - cpu->env.sigp_order = 0; >>> - s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); >>> - >>> - memset(env, 0, offsetof(CPUS390XState, end_reset_fields)); >>> - >>> - /* architectured initial values for CR 0 and 14 */ >>> - env->cregs[0] = CR0_RESET; >>> - env->cregs[14] = CR14_RESET; >>> - >>> -#if defined(CONFIG_USER_ONLY) >>> - /* user mode should always be allowed to use the full FPU */ >>> - env->cregs[0] |= CR0_AFP; >>> - if (s390_has_feat(S390_FEAT_VECTOR)) { >>> - env->cregs[0] |= CR0_VECTOR; >>> - } >>> -#endif >> >> Huh, what happened to that change? > > Btw., wouldn't we need that for both initial and clear reset? user-only only does a cpu reset when starting up to initialize the cpu. no other resets will be triggered.
diff --git a/target/s390x/cpu-qom.h b/target/s390x/cpu-qom.h index 6f0a12042e..dbe5346ec9 100644 --- a/target/s390x/cpu-qom.h +++ b/target/s390x/cpu-qom.h @@ -37,6 +37,7 @@ typedef struct S390CPUDef S390CPUDef; typedef enum cpu_reset_type { S390_CPU_RESET_NORMAL, S390_CPU_RESET_INITIAL, + S390_CPU_RESET_CLEAR, } cpu_reset_type; /** diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c index 1f423fb676..017181fe4a 100644 --- a/target/s390x/cpu.c +++ b/target/s390x/cpu.c @@ -94,6 +94,9 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type) s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); switch (type) { + case S390_CPU_RESET_CLEAR: + memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields)); + /* Fallthrough */ case S390_CPU_RESET_INITIAL: /* initial reset does not clear everything! */ memset(&env->start_initial_reset_fields, 0, @@ -121,46 +124,6 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type) } } -/* CPUClass:reset() */ -static void s390_cpu_full_reset(CPUState *s) -{ - S390CPU *cpu = S390_CPU(s); - S390CPUClass *scc = S390_CPU_GET_CLASS(cpu); - CPUS390XState *env = &cpu->env; - - scc->parent_reset(s); - cpu->env.sigp_order = 0; - s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); - - memset(env, 0, offsetof(CPUS390XState, end_reset_fields)); - - /* architectured initial values for CR 0 and 14 */ - env->cregs[0] = CR0_RESET; - env->cregs[14] = CR14_RESET; - -#if defined(CONFIG_USER_ONLY) - /* user mode should always be allowed to use the full FPU */ - env->cregs[0] |= CR0_AFP; - if (s390_has_feat(S390_FEAT_VECTOR)) { - env->cregs[0] |= CR0_VECTOR; - } -#endif - - /* architectured initial value for Breaking-Event-Address register */ - env->gbea = 1; - - env->pfault_token = -1UL; - - /* tininess for underflow is detected before rounding */ - set_float_detect_tininess(float_tininess_before_rounding, - &env->fpu_status); - - /* Reset state inside the kernel that we cannot access yet from QEMU. */ - if (kvm_enabled()) { - kvm_s390_reset_vcpu(cpu); - } -} - #if !defined(CONFIG_USER_ONLY) static void s390_cpu_machine_reset_cb(void *opaque) { @@ -452,6 +415,11 @@ static Property s390x_cpu_properties[] = { DEFINE_PROP_END_OF_LIST() }; +static void s390_cpu_reset_clear(CPUState *s) +{ + return s390_cpu_reset(s, S390_CPU_RESET_CLEAR); +} + static void s390_cpu_class_init(ObjectClass *oc, void *data) { S390CPUClass *scc = S390_CPU_CLASS(oc); @@ -468,7 +436,7 @@ static void s390_cpu_class_init(ObjectClass *oc, void *data) scc->load_normal = s390_cpu_load_normal; #endif scc->reset = s390_cpu_reset; - cc->reset = s390_cpu_full_reset; + cc->reset = s390_cpu_reset_clear; cc->class_by_name = s390_cpu_class_by_name, cc->has_work = s390_cpu_has_work; #ifdef CONFIG_TCG
Let's also move the clear reset function into the reset handler. Signed-off-by: Janosch Frank <frankja@linux.ibm.com> --- target/s390x/cpu-qom.h | 1 + target/s390x/cpu.c | 50 ++++++++---------------------------------- 2 files changed, 10 insertions(+), 41 deletions(-)