On Fri, 7 Jul 2023 21:31:47 +0530 Shivaprasad G Bhat <sb...@linux.ibm.com> wrote:
> On 7/7/23 17:52, Daniel Henrique Barboza wrote: > > > > > > On 7/7/23 08:59, Greg Kurz wrote: > >> Hi Daniel and Shiva ! > >> > >> On Fri, 7 Jul 2023 08:09:47 -0300 > >> Daniel Henrique Barboza <danielhb...@gmail.com> wrote: > >> > >>> This one was a buzzer shot. > >>> > >> > >> Indeed ! :-) I would have appreciated some more time to re-assess > >> my R-b tag on this 2 year old bug though ;-) > > > > My bad! I never thought it was that old. Never occured to me to check > > when > > the previous version was sent. > > > > Folks, please bear in mind that a Reviewed-by is given on the context > > when the > > patch was sent. A handful of months? Keep the R-bs. 6 months, from one > > release > > to the other? Things starts to get a little murky. 2 years? hahaha c'mon > > > Apologies, since v5 didn't need any rework I retained the Reviewed-bys. > > I agree, I should have been explicit in changelog about how old it is. > > > > At the very least you need to point out that the acks are old. > > > > > >> > >> My concerns were that the DAWR1 spapr cap was still not enabled by > >> default but I guess it is because POWER9 is still the default cpu > >> type. Related, the apply function should probably spit a warning > >> with TCG instead of failing, like already done for some other > >> TCG limitations (e.g. cap_safe_bounds_check_apply()). This will > >> be needed for `make test` to succeed when DAWR1 is eventually > >> enabled by default. Not needed right now. > >> > Thanks Greg, I will convert the errors to warnings for DAWR1 caps checks > > in the next version. However, I dont see any new "make test" failures > with the patch. > > Here are the logs "make test", > > With patch - > https://gist.github.com/shivaprasadbhat/859f7f4a0c105ac1232b7ab5d8e161e8#file-gistfile1-txt > > Without patch - > https://gist.github.com/shivaprasadbhat/25e5db9254cbe3292017f16adf41ecc1#file-gistfile1-txt > "make test" failures will happen only when DAWR1 is enabled by default. Retry your test with this change in spapr_machine_class_init() : + smc->default_caps.caps[SPAPR_CAP_DAWR1] = SPAPR_CAP_OFF; - smc->default_caps.caps[SPAPR_CAP_DAWR1] = SPAPR_CAP_ON; > > >> My R-b still stands then ! :-) > > > > This patch got lucky then. If you/Cedric remove your acks I would > > simply drop the > > patch and re-send the PR with the greatest of ease, no remorse > > whatsoever. > > > > > > Thanks, > > > > Daniel > > > >> > >> Cheers, > >> > >> -- > >> Greg > >> > >>> > >>> Queued in gitlab.com/danielhb/qemu/tree/ppc-next. Thanks, > >>> > >>> > >>> Daniel > >>> > >>> > >>> On 7/7/23 05:47, Shivaprasad G Bhat wrote: > >>>> From: Ravi Bangoria <ravi.bango...@linux.ibm.com> > >>>> > >>>> As per the PAPR, bit 0 of byte 64 in pa-features property > >>>> indicates availability of 2nd DAWR registers. i.e. If this bit is > >>>> set, 2nd > >>>> DAWR is present, otherwise not. Use KVM_CAP_PPC_DAWR1 capability to > >>>> find > >>>> whether kvm supports 2nd DAWR or not. If it's supported, allow user > >>>> to set > >>>> the pa-feature bit in guest DT using cap-dawr1 machine capability. > >>>> Though, > >>>> watchpoint on powerpc TCG guest is not supported and thus 2nd DAWR > >>>> is not > >>>> enabled for TCG mode. > >>>> > >>>> Signed-off-by: Ravi Bangoria <ravi.bango...@linux.ibm.com> > >>>> Reviewed-by: Greg Kurz <gr...@kaod.org> > >>>> Reviewed-by: Cédric Le Goater <c...@kaod.org> > >>>> Signed-off-by: Shivaprasad G Bhat <sb...@linux.ibm.com> > >>>> --- > >>>> Changelog: > >>>> v5: > >>>> https://lore.kernel.org/all/20210412114433.129702-1-ravi.bango...@linux.ibm.com/ > >>>> v5->v6: > >>>> - The other patches in the original series already merged. > >>>> - Rebased to the top of the tree. So, the > >>>> gen_spr_book3s_310_dbg() is renamed > >>>> to register_book3s_310_dbg_sprs() and moved to cpu_init.c > >>>> accordingly. > >>>> - No functional changes. > >>>> > >>>> v4: > >>>> https://lore.kernel.org/r/20210406053833.282907-1-ravi.bango...@linux.ibm.com > >>>> v3->v4: > >>>> - Make error message more proper. > >>>> > >>>> v3: > >>>> https://lore.kernel.org/r/20210330095350.36309-1-ravi.bango...@linux.ibm.com > >>>> v3->v4: > >>>> - spapr_dt_pa_features(): POWER10 processor is compatible with 3.0 > >>>> (PCR_COMPAT_3_00). No need to ppc_check_compat(3_10) for now as > >>>> ppc_check_compati(3_00) will also be true. > >>>> ppc_check_compat(3_10) > >>>> can be added while introducing pa_features_310 in future. > >>>> - Use error_append_hint() for hints. Also add ERRP_GUARD(). > >>>> - Add kvmppc_set_cap_dawr1() stub function for CONFIG_KVM=n. > >>>> > >>>> v2: > >>>> https://lore.kernel.org/r/20210329041906.213991-1-ravi.bango...@linux.ibm.com > >>>> v2->v3: > >>>> - Don't introduce pa_features_310[], instead, reuse > >>>> pa_features_300[] > >>>> for 3.1 guests, as there is no difference between initial > >>>> values of > >>>> them atm. > >>>> - Call gen_spr_book3s_310_dbg() from init_proc_POWER10() > >>>> instead of > >>>> init_proc_POWER8(). Also, Don't call gen_spr_book3s_207_dbg() > >>>> from > >>>> gen_spr_book3s_310_dbg() as init_proc_POWER10() already calls > >>>> it. > >>>> > >>>> v1: > >>>> https://lore.kernel.org/r/20200723104220.314671-1-ravi.bango...@linux.ibm.com > >>>> v1->v2: > >>>> - Introduce machine capability cap-dawr1 to enable/disable > >>>> the feature. By default, 2nd DAWR is OFF for guests even > >>>> when host kvm supports it. User has to manually enable it > >>>> with -machine cap-dawr1=on if he wishes to use it. > >>>> - Split the header file changes into separate patch. (Sync > >>>> headers from v5.12-rc3) > >>>> > >>>> [1] https://git.kernel.org/torvalds/c/bd1de1a0e6eff > >>>> > >>>> hw/ppc/spapr.c | 7 ++++++- > >>>> hw/ppc/spapr_caps.c | 32 ++++++++++++++++++++++++++++++++ > >>>> include/hw/ppc/spapr.h | 6 +++++- > >>>> target/ppc/cpu.h | 2 ++ > >>>> target/ppc/cpu_init.c | 15 +++++++++++++++ > >>>> target/ppc/kvm.c | 12 ++++++++++++ > >>>> target/ppc/kvm_ppc.h | 12 ++++++++++++ > >>>> 7 files changed, 84 insertions(+), 2 deletions(-) > >>>> > >>>> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c > >>>> index 54dbfd7fe9..1e54e0c719 100644 > >>>> --- a/hw/ppc/spapr.c > >>>> +++ b/hw/ppc/spapr.c > >>>> @@ -241,7 +241,7 @@ static void > >>>> spapr_dt_pa_features(SpaprMachineState *spapr, > >>>> 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, /* 48 - 53 */ > >>>> /* 54: DecFP, 56: DecI, 58: SHA */ > >>>> 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, /* 54 - 59 */ > >>>> - /* 60: NM atomic, 62: RNG */ > >>>> + /* 60: NM atomic, 62: RNG, 64: DAWR1 (ISA 3.1) */ > >>>> 0x80, 0x00, 0x80, 0x00, 0x00, 0x00, /* 60 - 65 */ > >>>> }; > >>>> uint8_t *pa_features = NULL; > >>>> @@ -282,6 +282,9 @@ static void > >>>> spapr_dt_pa_features(SpaprMachineState *spapr, > >>>> * in pa-features. So hide it from them. */ > >>>> pa_features[40 + 2] &= ~0x80; /* Radix MMU */ > >>>> } > >>>> + if (spapr_get_cap(spapr, SPAPR_CAP_DAWR1)) { > >>>> + pa_features[66] |= 0x80; > >>>> + } > >>>> > >>>> _FDT((fdt_setprop(fdt, offset, "ibm,pa-features", > >>>> pa_features, pa_size))); > >>>> } > >>>> @@ -2084,6 +2087,7 @@ static const VMStateDescription vmstate_spapr > >>>> = { > >>>> &vmstate_spapr_cap_fwnmi, > >>>> &vmstate_spapr_fwnmi, > >>>> &vmstate_spapr_cap_rpt_invalidate, > >>>> + &vmstate_spapr_cap_dawr1, > >>>> NULL > >>>> } > >>>> }; > >>>> @@ -4683,6 +4687,7 @@ static void > >>>> spapr_machine_class_init(ObjectClass *oc, void *data) > >>>> smc->default_caps.caps[SPAPR_CAP_CCF_ASSIST] = SPAPR_CAP_ON; > >>>> smc->default_caps.caps[SPAPR_CAP_FWNMI] = SPAPR_CAP_ON; > >>>> smc->default_caps.caps[SPAPR_CAP_RPT_INVALIDATE] = > >>>> SPAPR_CAP_OFF; > >>>> + smc->default_caps.caps[SPAPR_CAP_DAWR1] = SPAPR_CAP_OFF; > >>>> > >>>> /* > >>>> * This cap specifies whether the AIL 3 mode for > >>>> diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c > >>>> index 5a0755d34f..2f2cf4a250 100644 > >>>> --- a/hw/ppc/spapr_caps.c > >>>> +++ b/hw/ppc/spapr_caps.c > >>>> @@ -655,6 +655,28 @@ static void > >>>> cap_ail_mode_3_apply(SpaprMachineState *spapr, > >>>> } > >>>> } > >>>> > >>>> +static void cap_dawr1_apply(SpaprMachineState *spapr, uint8_t val, > >>>> + Error **errp) > >>>> +{ > >>>> + ERRP_GUARD(); > >>>> + if (!val) { > >>>> + return; /* Disable by default */ > >>>> + } > >>>> + > >>>> + if (tcg_enabled()) { > >>>> + error_setg(errp, "DAWR1 not supported in TCG."); > >>>> + error_append_hint(errp, "Try appending -machine > >>>> cap-dawr1=off\n"); > >>>> + } else if (kvm_enabled()) { > >>>> + if (!kvmppc_has_cap_dawr1()) { > >>>> + error_setg(errp, "DAWR1 not supported by KVM."); > >>>> + error_append_hint(errp, "Try appending -machine > >>>> cap-dawr1=off\n"); > >>>> + } else if (kvmppc_set_cap_dawr1(val) < 0) { > >>>> + error_setg(errp, "Error enabling cap-dawr1 with KVM."); > >>>> + error_append_hint(errp, "Try appending -machine > >>>> cap-dawr1=off\n"); > >>>> + } > >>>> + } > >>>> +} > >>>> + > >>>> SpaprCapabilityInfo capability_table[SPAPR_CAP_NUM] = { > >>>> [SPAPR_CAP_HTM] = { > >>>> .name = "htm", > >>>> @@ -781,6 +803,15 @@ SpaprCapabilityInfo > >>>> capability_table[SPAPR_CAP_NUM] = { > >>>> .type = "bool", > >>>> .apply = cap_ail_mode_3_apply, > >>>> }, > >>>> + [SPAPR_CAP_DAWR1] = { > >>>> + .name = "dawr1", > >>>> + .description = "Allow 2nd Data Address Watchpoint Register > >>>> (DAWR1)", > >>>> + .index = SPAPR_CAP_DAWR1, > >>>> + .get = spapr_cap_get_bool, > >>>> + .set = spapr_cap_set_bool, > >>>> + .type = "bool", > >>>> + .apply = cap_dawr1_apply, > >>>> + }, > >>>> }; > >>>> > >>>> static SpaprCapabilities default_caps_with_cpu(SpaprMachineState > >>>> *spapr, > >>>> @@ -923,6 +954,7 @@ SPAPR_CAP_MIG_STATE(large_decr, > >>>> SPAPR_CAP_LARGE_DECREMENTER); > >>>> SPAPR_CAP_MIG_STATE(ccf_assist, SPAPR_CAP_CCF_ASSIST); > >>>> SPAPR_CAP_MIG_STATE(fwnmi, SPAPR_CAP_FWNMI); > >>>> SPAPR_CAP_MIG_STATE(rpt_invalidate, SPAPR_CAP_RPT_INVALIDATE); > >>>> +SPAPR_CAP_MIG_STATE(dawr1, SPAPR_CAP_DAWR1); > >>>> > >>>> void spapr_caps_init(SpaprMachineState *spapr) > >>>> { > >>>> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h > >>>> index 538b2dfb89..47fffb921a 100644 > >>>> --- a/include/hw/ppc/spapr.h > >>>> +++ b/include/hw/ppc/spapr.h > >>>> @@ -80,8 +80,10 @@ typedef enum { > >>>> #define SPAPR_CAP_RPT_INVALIDATE 0x0B > >>>> /* Support for AIL modes */ > >>>> #define SPAPR_CAP_AIL_MODE_3 0x0C > >>>> +/* DAWR1 */ > >>>> +#define SPAPR_CAP_DAWR1 0x0D > >>>> /* Num Caps */ > >>>> -#define SPAPR_CAP_NUM (SPAPR_CAP_AIL_MODE_3 + 1) > >>>> +#define SPAPR_CAP_NUM (SPAPR_CAP_DAWR1 + 1) > >>>> > >>>> /* > >>>> * Capability Values > >>>> @@ -407,6 +409,7 @@ struct SpaprMachineState { > >>>> #define H_SET_MODE_RESOURCE_SET_DAWR0 2 > >>>> #define H_SET_MODE_RESOURCE_ADDR_TRANS_MODE 3 > >>>> #define H_SET_MODE_RESOURCE_LE 4 > >>>> +#define H_SET_MODE_RESOURCE_SET_DAWR1 5 > >>>> > >>>> /* Flags for H_SET_MODE_RESOURCE_LE */ > >>>> #define H_SET_MODE_ENDIAN_BIG 0 > >>>> @@ -990,6 +993,7 @@ extern const VMStateDescription > >>>> vmstate_spapr_cap_ccf_assist; > >>>> extern const VMStateDescription vmstate_spapr_cap_fwnmi; > >>>> extern const VMStateDescription vmstate_spapr_cap_rpt_invalidate; > >>>> extern const VMStateDescription vmstate_spapr_wdt; > >>>> +extern const VMStateDescription vmstate_spapr_cap_dawr1; > >>>> > >>>> static inline uint8_t spapr_get_cap(SpaprMachineState *spapr, > >>>> int cap) > >>>> { > >>>> diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h > >>>> index af12c93ebc..64855935f7 100644 > >>>> --- a/target/ppc/cpu.h > >>>> +++ b/target/ppc/cpu.h > >>>> @@ -1588,9 +1588,11 @@ void ppc_compat_add_property(Object *obj, > >>>> const char *name, > >>>> #define SPR_PSPB (0x09F) > >>>> #define SPR_DPDES (0x0B0) > >>>> #define SPR_DAWR0 (0x0B4) > >>>> +#define SPR_DAWR1 (0x0B5) > >>>> #define SPR_RPR (0x0BA) > >>>> #define SPR_CIABR (0x0BB) > >>>> #define SPR_DAWRX0 (0x0BC) > >>>> +#define SPR_DAWRX1 (0x0BD) > >>>> #define SPR_HFSCR (0x0BE) > >>>> #define SPR_VRSAVE (0x100) > >>>> #define SPR_USPRG0 (0x100) > >>>> diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c > >>>> index aeff71d063..c688e52928 100644 > >>>> --- a/target/ppc/cpu_init.c > >>>> +++ b/target/ppc/cpu_init.c > >>>> @@ -5131,6 +5131,20 @@ static void > >>>> register_book3s_207_dbg_sprs(CPUPPCState *env) > >>>> KVM_REG_PPC_CIABR, 0x00000000); > >>>> } > >>>> > >>>> +static void register_book3s_310_dbg_sprs(CPUPPCState *env) > >>>> +{ > >>>> + spr_register_kvm_hv(env, SPR_DAWR1, "DAWR1", > >>>> + SPR_NOACCESS, SPR_NOACCESS, > >>>> + SPR_NOACCESS, SPR_NOACCESS, > >>>> + &spr_read_generic, &spr_write_generic, > >>>> + KVM_REG_PPC_DAWR1, 0x00000000); > >>>> + spr_register_kvm_hv(env, SPR_DAWRX1, "DAWRX1", > >>>> + SPR_NOACCESS, SPR_NOACCESS, > >>>> + SPR_NOACCESS, SPR_NOACCESS, > >>>> + &spr_read_generic, &spr_write_generic32, > >>>> + KVM_REG_PPC_DAWRX1, 0x00000000); > >>>> +} > >>>> + > >>>> static void register_970_dbg_sprs(CPUPPCState *env) > >>>> { > >>>> /* Breakpoints */ > >>>> @@ -6435,6 +6449,7 @@ static void init_proc_POWER10(CPUPPCState *env) > >>>> /* Common Registers */ > >>>> init_proc_book3s_common(env); > >>>> register_book3s_207_dbg_sprs(env); > >>>> + register_book3s_310_dbg_sprs(env); > >>>> > >>>> /* Common TCG PMU */ > >>>> init_tcg_pmu_power8(env); > >>>> diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c > >>>> index a8a935e267..05f68d2d91 100644 > >>>> --- a/target/ppc/kvm.c > >>>> +++ b/target/ppc/kvm.c > >>>> @@ -89,6 +89,7 @@ static int cap_large_decr; > >>>> static int cap_fwnmi; > >>>> static int cap_rpt_invalidate; > >>>> static int cap_ail_mode_3; > >>>> +static int cap_dawr1; > >>>> > >>>> static uint32_t debug_inst_opcode; > >>>> > >>>> @@ -138,6 +139,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s) > >>>> cap_ppc_nested_kvm_hv = kvm_vm_check_extension(s, > >>>> KVM_CAP_PPC_NESTED_HV); > >>>> cap_large_decr = kvmppc_get_dec_bits(); > >>>> cap_fwnmi = kvm_vm_check_extension(s, KVM_CAP_PPC_FWNMI); > >>>> + cap_dawr1 = kvm_vm_check_extension(s, KVM_CAP_PPC_DAWR1); > >>>> /* > >>>> * Note: setting it to false because there is not such > >>>> capability > >>>> * in KVM at this moment. > >>>> @@ -2109,6 +2111,16 @@ int kvmppc_set_fwnmi(PowerPCCPU *cpu) > >>>> return kvm_vcpu_enable_cap(cs, KVM_CAP_PPC_FWNMI, 0); > >>>> } > >>>> > >>>> +bool kvmppc_has_cap_dawr1(void) > >>>> +{ > >>>> + return !!cap_dawr1; > >>>> +} > >>>> + > >>>> +int kvmppc_set_cap_dawr1(int enable) > >>>> +{ > >>>> + return kvm_vm_enable_cap(kvm_state, KVM_CAP_PPC_DAWR1, 0, > >>>> enable); > >>>> +} > >>>> + > >>>> int kvmppc_smt_threads(void) > >>>> { > >>>> return cap_ppc_smt ? cap_ppc_smt : 1; > >>>> diff --git a/target/ppc/kvm_ppc.h b/target/ppc/kvm_ppc.h > >>>> index 611debc3ce..584916a6d1 100644 > >>>> --- a/target/ppc/kvm_ppc.h > >>>> +++ b/target/ppc/kvm_ppc.h > >>>> @@ -67,6 +67,8 @@ bool kvmppc_has_cap_htm(void); > >>>> bool kvmppc_has_cap_mmu_radix(void); > >>>> bool kvmppc_has_cap_mmu_hash_v3(void); > >>>> bool kvmppc_has_cap_xive(void); > >>>> +bool kvmppc_has_cap_dawr1(void); > >>>> +int kvmppc_set_cap_dawr1(int enable); > >>>> int kvmppc_get_cap_safe_cache(void); > >>>> int kvmppc_get_cap_safe_bounds_check(void); > >>>> int kvmppc_get_cap_safe_indirect_branch(void); > >>>> @@ -352,6 +354,16 @@ static inline bool kvmppc_has_cap_xive(void) > >>>> return false; > >>>> } > >>>> > >>>> +static inline bool kvmppc_has_cap_dawr1(void) > >>>> +{ > >>>> + return false; > >>>> +} > >>>> + > >>>> +static inline int kvmppc_set_cap_dawr1(int enable) > >>>> +{ > >>>> + abort(); > >>>> +} > >>>> + > >>>> static inline int kvmppc_get_cap_safe_cache(void) > >>>> { > >>>> return 0; > >>>> > >>>> > >> > >> > >> -- Greg
