| Message ID | 1462291414-8343-8-git-send-email-clg@kaod.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, May 03, 2016 at 06:03:29PM +0200, Cédric Le Goater wrote: > From: Benjamin Herrenschmidt <benh@kernel.crashing.org> > > We use an env. flag which is set to the initial value of MSR_HVB in > the msr_mask. We also adjust the POWER8 mask to set SHV. > > Also use this to adjust ctx.hv so that it is *set* when the processor > doesn't have an HV mode (970 with Apple mode for example), thus enabling > hypervisor instructions/SPRs. > > Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> > Reviewed-by: David Gibson <david@gibson.dropbear.id.au> > --- > target-ppc/cpu.h | 4 ++++ > target-ppc/translate.c | 4 +++- > target-ppc/translate_init.c | 21 ++++++++++++++++----- > 3 files changed, 23 insertions(+), 6 deletions(-) > > diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h > index 2a96efcbf813..02f2e72e6d14 100644 > --- a/target-ppc/cpu.h > +++ b/target-ppc/cpu.h > @@ -1161,6 +1161,10 @@ struct CPUPPCState { > hwaddr mpic_iack; > /* true when the external proxy facility mode is enabled */ > bool mpic_proxy; > + /* set when the processor has an HV mode, thus HV priv > + * instructions and SPRs are diallowed if MSR:HV is 0 > + */ > + bool has_hv_mode; > #endif > > /* Those resources are used only during code translation */ > diff --git a/target-ppc/translate.c b/target-ppc/translate.c > index 7a672cba796d..6f55bcd34a74 100644 > --- a/target-ppc/translate.c > +++ b/target-ppc/translate.c > @@ -11495,8 +11495,10 @@ void gen_intermediate_code(CPUPPCState *env, struct TranslationBlock *tb) > ctx.exception = POWERPC_EXCP_NONE; > ctx.spr_cb = env->spr_cb; > ctx.pr = msr_pr; > - ctx.hv = !msr_pr && msr_hv; The test for msr_pr has been removed in the new version. Maybe that's safe, but I think it needs some justification. > ctx.mem_idx = env->dmmu_idx; > +#if !defined(CONFIG_USER_ONLY) > + ctx.hv = msr_hv || !env->has_hv_mode; > +#endif > ctx.insns_flags = env->insns_flags; > ctx.insns_flags2 = env->insns_flags2; > ctx.access_type = -1; > diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c > index 10a92fdbbdd7..df656e6021b4 100644 > --- a/target-ppc/translate_init.c > +++ b/target-ppc/translate_init.c > @@ -8579,7 +8579,8 @@ POWERPC_FAMILY(POWER8)(ObjectClass *oc, void *data) > PPC2_ISA205 | PPC2_ISA207S | PPC2_FP_CVT_S64 | > PPC2_TM; > pcc->msr_mask = (1ull << MSR_SF) | > - (1ull << MSR_TM) | > + (1ull << MSR_SHV) | > + (1ull << MSR_TM) | > (1ull << MSR_VR) | > (1ull << MSR_VSX) | > (1ull << MSR_EE) | > @@ -9975,10 +9976,7 @@ static void ppc_cpu_reset(CPUState *s) > pcc->parent_reset(s); > > msr = (target_ulong)0; > - if (0) { > - /* XXX: find a suitable condition to enable the hypervisor mode */ > - msr |= (target_ulong)MSR_HVB; > - } > + msr |= (target_ulong)MSR_HVB; > msr |= (target_ulong)0 << MSR_AP; /* TO BE CHECKED */ > msr |= (target_ulong)0 << MSR_SA; /* TO BE CHECKED */ > msr |= (target_ulong)1 << MSR_EP; > @@ -10079,6 +10077,19 @@ static void ppc_cpu_initfn(Object *obj) > env->bfd_mach = pcc->bfd_mach; > env->check_pow = pcc->check_pow; > > + /* Mark HV mode as supported if the CPU has an MSR_HV bit > + * in the msr_mask. The mask can later be cleared by PAPR > + * mode but the hv mode support will remain, thus enforcing > + * that we cannot use priv. instructions in guest in PAPR > + * mode. For 970 we currently simply don't set HV in msr_mask > + * thus simulating an "Apple mode" 970. If we ever want to > + * support 970 HV mode, we'll have to add a processor attribute > + * of some sort. > + */ > +#if !defined(CONFIG_USER_ONLY) > + env->has_hv_mode = !!(env->msr_mask & MSR_HVB); > +#endif > + > #if defined(TARGET_PPC64) > if (pcc->sps) { > env->sps = *pcc->sps;
On 27.05.2016 05:38, David Gibson wrote: > On Tue, May 03, 2016 at 06:03:29PM +0200, Cédric Le Goater wrote: >> From: Benjamin Herrenschmidt <benh@kernel.crashing.org> >> >> We use an env. flag which is set to the initial value of MSR_HVB in >> the msr_mask. We also adjust the POWER8 mask to set SHV. >> >> Also use this to adjust ctx.hv so that it is *set* when the processor >> doesn't have an HV mode (970 with Apple mode for example), thus enabling >> hypervisor instructions/SPRs. >> >> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> >> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> >> --- >> target-ppc/cpu.h | 4 ++++ >> target-ppc/translate.c | 4 +++- >> target-ppc/translate_init.c | 21 ++++++++++++++++----- >> 3 files changed, 23 insertions(+), 6 deletions(-) ... >> diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c >> index 10a92fdbbdd7..df656e6021b4 100644 >> --- a/target-ppc/translate_init.c >> +++ b/target-ppc/translate_init.c >> @@ -8579,7 +8579,8 @@ POWERPC_FAMILY(POWER8)(ObjectClass *oc, void *data) >> PPC2_ISA205 | PPC2_ISA207S | PPC2_FP_CVT_S64 | >> PPC2_TM; >> pcc->msr_mask = (1ull << MSR_SF) | >> - (1ull << MSR_TM) | >> + (1ull << MSR_SHV) | >> + (1ull << MSR_TM) | >> (1ull << MSR_VR) | >> (1ull << MSR_VSX) | >> (1ull << MSR_EE) | This indentation looks somewhat suspicious ... and indeed, checkpatch compains here: ERROR: code indent should never use tabs #153: FILE: target-ppc/translate_init.c:8583: +^I^I (1ull << MSR_TM) |$ total: 1 errors, 0 warnings, 60 lines checked Please fix it to use spaces instead. Thomas
On 05/27/2016 05:38 AM, David Gibson wrote: > On Tue, May 03, 2016 at 06:03:29PM +0200, Cédric Le Goater wrote: >> From: Benjamin Herrenschmidt <benh@kernel.crashing.org> >> >> We use an env. flag which is set to the initial value of MSR_HVB in >> the msr_mask. We also adjust the POWER8 mask to set SHV. >> >> Also use this to adjust ctx.hv so that it is *set* when the processor >> doesn't have an HV mode (970 with Apple mode for example), thus enabling >> hypervisor instructions/SPRs. >> >> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> >> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> >> --- >> target-ppc/cpu.h | 4 ++++ >> target-ppc/translate.c | 4 +++- >> target-ppc/translate_init.c | 21 ++++++++++++++++----- >> 3 files changed, 23 insertions(+), 6 deletions(-) >> >> diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h >> index 2a96efcbf813..02f2e72e6d14 100644 >> --- a/target-ppc/cpu.h >> +++ b/target-ppc/cpu.h >> @@ -1161,6 +1161,10 @@ struct CPUPPCState { >> hwaddr mpic_iack; >> /* true when the external proxy facility mode is enabled */ >> bool mpic_proxy; >> + /* set when the processor has an HV mode, thus HV priv >> + * instructions and SPRs are diallowed if MSR:HV is 0 >> + */ >> + bool has_hv_mode; >> #endif >> >> /* Those resources are used only during code translation */ >> diff --git a/target-ppc/translate.c b/target-ppc/translate.c >> index 7a672cba796d..6f55bcd34a74 100644 >> --- a/target-ppc/translate.c >> +++ b/target-ppc/translate.c >> @@ -11495,8 +11495,10 @@ void gen_intermediate_code(CPUPPCState *env, struct TranslationBlock *tb) >> ctx.exception = POWERPC_EXCP_NONE; >> ctx.spr_cb = env->spr_cb; >> ctx.pr = msr_pr; >> - ctx.hv = !msr_pr && msr_hv; > > The test for msr_pr has been removed in the new version. Maybe that's > safe, but I think it needs some justification. I don't know if it is safe to run with (MSR_HV|MSR_PR) = 11 There is a note in the Power ISA book describing such a case but I am not sure qemu-ppc supports that. So I will keep the msr_pr check in the next version : ctx.hv = !msr_pr && (msr_hv || !env->has_hv_mode); Thanks, C. >> ctx.mem_idx = env->dmmu_idx; >> +#if !defined(CONFIG_USER_ONLY) >> + ctx.hv = msr_hv || !env->has_hv_mode; >> +#endif >> ctx.insns_flags = env->insns_flags; >> ctx.insns_flags2 = env->insns_flags2; >> ctx.access_type = -1; >> diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c >> index 10a92fdbbdd7..df656e6021b4 100644 >> --- a/target-ppc/translate_init.c >> +++ b/target-ppc/translate_init.c >> @@ -8579,7 +8579,8 @@ POWERPC_FAMILY(POWER8)(ObjectClass *oc, void *data) >> PPC2_ISA205 | PPC2_ISA207S | PPC2_FP_CVT_S64 | >> PPC2_TM; >> pcc->msr_mask = (1ull << MSR_SF) | >> - (1ull << MSR_TM) | >> + (1ull << MSR_SHV) | >> + (1ull << MSR_TM) | >> (1ull << MSR_VR) | >> (1ull << MSR_VSX) | >> (1ull << MSR_EE) | >> @@ -9975,10 +9976,7 @@ static void ppc_cpu_reset(CPUState *s) >> pcc->parent_reset(s); >> >> msr = (target_ulong)0; >> - if (0) { >> - /* XXX: find a suitable condition to enable the hypervisor mode */ >> - msr |= (target_ulong)MSR_HVB; >> - } >> + msr |= (target_ulong)MSR_HVB; >> msr |= (target_ulong)0 << MSR_AP; /* TO BE CHECKED */ >> msr |= (target_ulong)0 << MSR_SA; /* TO BE CHECKED */ >> msr |= (target_ulong)1 << MSR_EP; >> @@ -10079,6 +10077,19 @@ static void ppc_cpu_initfn(Object *obj) >> env->bfd_mach = pcc->bfd_mach; >> env->check_pow = pcc->check_pow; >> >> + /* Mark HV mode as supported if the CPU has an MSR_HV bit >> + * in the msr_mask. The mask can later be cleared by PAPR >> + * mode but the hv mode support will remain, thus enforcing >> + * that we cannot use priv. instructions in guest in PAPR >> + * mode. For 970 we currently simply don't set HV in msr_mask >> + * thus simulating an "Apple mode" 970. If we ever want to >> + * support 970 HV mode, we'll have to add a processor attribute >> + * of some sort. >> + */ >> +#if !defined(CONFIG_USER_ONLY) >> + env->has_hv_mode = !!(env->msr_mask & MSR_HVB); >> +#endif >> + >> #if defined(TARGET_PPC64) >> if (pcc->sps) { >> env->sps = *pcc->sps; >
On 05/27/2016 06:41 AM, Thomas Huth wrote: > On 27.05.2016 05:38, David Gibson wrote: >> On Tue, May 03, 2016 at 06:03:29PM +0200, Cédric Le Goater wrote: >>> From: Benjamin Herrenschmidt <benh@kernel.crashing.org> >>> >>> We use an env. flag which is set to the initial value of MSR_HVB in >>> the msr_mask. We also adjust the POWER8 mask to set SHV. >>> >>> Also use this to adjust ctx.hv so that it is *set* when the processor >>> doesn't have an HV mode (970 with Apple mode for example), thus enabling >>> hypervisor instructions/SPRs. >>> >>> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> >>> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> >>> --- >>> target-ppc/cpu.h | 4 ++++ >>> target-ppc/translate.c | 4 +++- >>> target-ppc/translate_init.c | 21 ++++++++++++++++----- >>> 3 files changed, 23 insertions(+), 6 deletions(-) > ... >>> diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c >>> index 10a92fdbbdd7..df656e6021b4 100644 >>> --- a/target-ppc/translate_init.c >>> +++ b/target-ppc/translate_init.c >>> @@ -8579,7 +8579,8 @@ POWERPC_FAMILY(POWER8)(ObjectClass *oc, void *data) >>> PPC2_ISA205 | PPC2_ISA207S | PPC2_FP_CVT_S64 | >>> PPC2_TM; >>> pcc->msr_mask = (1ull << MSR_SF) | >>> - (1ull << MSR_TM) | >>> + (1ull << MSR_SHV) | >>> + (1ull << MSR_TM) | >>> (1ull << MSR_VR) | >>> (1ull << MSR_VSX) | >>> (1ull << MSR_EE) | > > This indentation looks somewhat suspicious ... and indeed, checkpatch > compains here: > > ERROR: code indent should never use tabs > #153: FILE: target-ppc/translate_init.c:8583: > +^I^I (1ull << MSR_TM) |$ > > total: 1 errors, 0 warnings, 60 lines checked > > Please fix it to use spaces instead. Sure. I will. Thanks for checking. A couple of other patches for PowerNV are in the same state. Sometimes I wish I had a reasonable 'indent' command line. C.
On Fri, May 27, 2016 at 09:56:32AM +0200, Cédric Le Goater wrote: > On 05/27/2016 05:38 AM, David Gibson wrote: > > On Tue, May 03, 2016 at 06:03:29PM +0200, Cédric Le Goater wrote: > >> From: Benjamin Herrenschmidt <benh@kernel.crashing.org> > >> > >> We use an env. flag which is set to the initial value of MSR_HVB in > >> the msr_mask. We also adjust the POWER8 mask to set SHV. > >> > >> Also use this to adjust ctx.hv so that it is *set* when the processor > >> doesn't have an HV mode (970 with Apple mode for example), thus enabling > >> hypervisor instructions/SPRs. > >> > >> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> > >> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> > >> --- > >> target-ppc/cpu.h | 4 ++++ > >> target-ppc/translate.c | 4 +++- > >> target-ppc/translate_init.c | 21 ++++++++++++++++----- > >> 3 files changed, 23 insertions(+), 6 deletions(-) > >> > >> diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h > >> index 2a96efcbf813..02f2e72e6d14 100644 > >> --- a/target-ppc/cpu.h > >> +++ b/target-ppc/cpu.h > >> @@ -1161,6 +1161,10 @@ struct CPUPPCState { > >> hwaddr mpic_iack; > >> /* true when the external proxy facility mode is enabled */ > >> bool mpic_proxy; > >> + /* set when the processor has an HV mode, thus HV priv > >> + * instructions and SPRs are diallowed if MSR:HV is 0 > >> + */ > >> + bool has_hv_mode; > >> #endif > >> > >> /* Those resources are used only during code translation */ > >> diff --git a/target-ppc/translate.c b/target-ppc/translate.c > >> index 7a672cba796d..6f55bcd34a74 100644 > >> --- a/target-ppc/translate.c > >> +++ b/target-ppc/translate.c > >> @@ -11495,8 +11495,10 @@ void gen_intermediate_code(CPUPPCState *env, struct TranslationBlock *tb) > >> ctx.exception = POWERPC_EXCP_NONE; > >> ctx.spr_cb = env->spr_cb; > >> ctx.pr = msr_pr; > >> - ctx.hv = !msr_pr && msr_hv; > > > > The test for msr_pr has been removed in the new version. Maybe that's > > safe, but I think it needs some justification. > > I don't know if it is safe to run with (MSR_HV|MSR_PR) = 11 Um.. I believe host userland runs routinely in that state. > There is a note in the Power ISA book describing such a case but I am not > sure qemu-ppc supports that. So I will keep the msr_pr check in the next > version : > > ctx.hv = !msr_pr && (msr_hv || !env->has_hv_mode); Ok.
On 05/28/2016 11:52 AM, David Gibson wrote: > On Fri, May 27, 2016 at 09:56:32AM +0200, Cédric Le Goater wrote: >> On 05/27/2016 05:38 AM, David Gibson wrote: >>> On Tue, May 03, 2016 at 06:03:29PM +0200, Cédric Le Goater wrote: >>>> From: Benjamin Herrenschmidt <benh@kernel.crashing.org> >>>> >>>> We use an env. flag which is set to the initial value of MSR_HVB in >>>> the msr_mask. We also adjust the POWER8 mask to set SHV. >>>> >>>> Also use this to adjust ctx.hv so that it is *set* when the processor >>>> doesn't have an HV mode (970 with Apple mode for example), thus enabling >>>> hypervisor instructions/SPRs. >>>> >>>> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> >>>> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> >>>> --- >>>> target-ppc/cpu.h | 4 ++++ >>>> target-ppc/translate.c | 4 +++- >>>> target-ppc/translate_init.c | 21 ++++++++++++++++----- >>>> 3 files changed, 23 insertions(+), 6 deletions(-) >>>> >>>> diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h >>>> index 2a96efcbf813..02f2e72e6d14 100644 >>>> --- a/target-ppc/cpu.h >>>> +++ b/target-ppc/cpu.h >>>> @@ -1161,6 +1161,10 @@ struct CPUPPCState { >>>> hwaddr mpic_iack; >>>> /* true when the external proxy facility mode is enabled */ >>>> bool mpic_proxy; >>>> + /* set when the processor has an HV mode, thus HV priv >>>> + * instructions and SPRs are diallowed if MSR:HV is 0 >>>> + */ >>>> + bool has_hv_mode; >>>> #endif >>>> >>>> /* Those resources are used only during code translation */ >>>> diff --git a/target-ppc/translate.c b/target-ppc/translate.c >>>> index 7a672cba796d..6f55bcd34a74 100644 >>>> --- a/target-ppc/translate.c >>>> +++ b/target-ppc/translate.c >>>> @@ -11495,8 +11495,10 @@ void gen_intermediate_code(CPUPPCState *env, struct TranslationBlock *tb) >>>> ctx.exception = POWERPC_EXCP_NONE; >>>> ctx.spr_cb = env->spr_cb; >>>> ctx.pr = msr_pr; >>>> - ctx.hv = !msr_pr && msr_hv; >>> >>> The test for msr_pr has been removed in the new version. Maybe that's >>> safe, but I think it needs some justification. >> >> I don't know if it is safe to run with (MSR_HV|MSR_PR) = 11 > > Um.. I believe host userland runs routinely in that state. oui oui oui ... of course. hmm, I need to dig more the consequences of the *HV* patches. Thanks, C. >> There is a note in the Power ISA book describing such a case but I am not >> sure qemu-ppc supports that. So I will keep the msr_pr check in the next >> version : >> >> ctx.hv = !msr_pr && (msr_hv || !env->has_hv_mode); > > Ok. >
diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h index 2a96efcbf813..02f2e72e6d14 100644 --- a/target-ppc/cpu.h +++ b/target-ppc/cpu.h @@ -1161,6 +1161,10 @@ struct CPUPPCState { hwaddr mpic_iack; /* true when the external proxy facility mode is enabled */ bool mpic_proxy; + /* set when the processor has an HV mode, thus HV priv + * instructions and SPRs are diallowed if MSR:HV is 0 + */ + bool has_hv_mode; #endif /* Those resources are used only during code translation */ diff --git a/target-ppc/translate.c b/target-ppc/translate.c index 7a672cba796d..6f55bcd34a74 100644 --- a/target-ppc/translate.c +++ b/target-ppc/translate.c @@ -11495,8 +11495,10 @@ void gen_intermediate_code(CPUPPCState *env, struct TranslationBlock *tb) ctx.exception = POWERPC_EXCP_NONE; ctx.spr_cb = env->spr_cb; ctx.pr = msr_pr; - ctx.hv = !msr_pr && msr_hv; ctx.mem_idx = env->dmmu_idx; +#if !defined(CONFIG_USER_ONLY) + ctx.hv = msr_hv || !env->has_hv_mode; +#endif ctx.insns_flags = env->insns_flags; ctx.insns_flags2 = env->insns_flags2; ctx.access_type = -1; diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c index 10a92fdbbdd7..df656e6021b4 100644 --- a/target-ppc/translate_init.c +++ b/target-ppc/translate_init.c @@ -8579,7 +8579,8 @@ POWERPC_FAMILY(POWER8)(ObjectClass *oc, void *data) PPC2_ISA205 | PPC2_ISA207S | PPC2_FP_CVT_S64 | PPC2_TM; pcc->msr_mask = (1ull << MSR_SF) | - (1ull << MSR_TM) | + (1ull << MSR_SHV) | + (1ull << MSR_TM) | (1ull << MSR_VR) | (1ull << MSR_VSX) | (1ull << MSR_EE) | @@ -9975,10 +9976,7 @@ static void ppc_cpu_reset(CPUState *s) pcc->parent_reset(s); msr = (target_ulong)0; - if (0) { - /* XXX: find a suitable condition to enable the hypervisor mode */ - msr |= (target_ulong)MSR_HVB; - } + msr |= (target_ulong)MSR_HVB; msr |= (target_ulong)0 << MSR_AP; /* TO BE CHECKED */ msr |= (target_ulong)0 << MSR_SA; /* TO BE CHECKED */ msr |= (target_ulong)1 << MSR_EP; @@ -10079,6 +10077,19 @@ static void ppc_cpu_initfn(Object *obj) env->bfd_mach = pcc->bfd_mach; env->check_pow = pcc->check_pow; + /* Mark HV mode as supported if the CPU has an MSR_HV bit + * in the msr_mask. The mask can later be cleared by PAPR + * mode but the hv mode support will remain, thus enforcing + * that we cannot use priv. instructions in guest in PAPR + * mode. For 970 we currently simply don't set HV in msr_mask + * thus simulating an "Apple mode" 970. If we ever want to + * support 970 HV mode, we'll have to add a processor attribute + * of some sort. + */ +#if !defined(CONFIG_USER_ONLY) + env->has_hv_mode = !!(env->msr_mask & MSR_HVB); +#endif + #if defined(TARGET_PPC64) if (pcc->sps) { env->sps = *pcc->sps;