| Message ID | 20240311185200.2185753-5-npiggin@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | misc ppc patches | expand |
Hi Nick, On 3/12/24 00:21, Nicholas Piggin wrote: > TCG does not support copy/paste instructions. Remove it from > ibm,pa-features. This has never been implemented under TCG or s/or/nor ? > practically usable under KVM, so it won't be missed. > > Signed-off-by: Nicholas Piggin <npiggin@gmail.com> > --- > hw/ppc/spapr.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c > index 5099f12cc6..7d7da30f60 100644 > --- a/hw/ppc/spapr.c > +++ b/hw/ppc/spapr.c > @@ -254,8 +254,8 @@ static void spapr_dt_pa_features(SpaprMachineState *spapr, > 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, /* 24 - 29 */ > /* 30: MMR, 32: LE atomic, 34: EBB + ext EBB */ > 0x80, 0x00, 0x80, 0x00, 0xC0, 0x00, /* 30 - 35 */ > - /* 36: SPR SO, 38: Copy/Paste, 40: Radix MMU */ > - 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, /* 36 - 41 */ > + /* 36: SPR SO, 40: Radix MMU */ > + 0x80, 0x00, 0x00, 0x00, 0x80, 0x00, /* 36 - 41 */ > /* 42: PM, 44: PC RA, 46: SC vec'd */ > 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, /* 42 - 47 */ > /* 48: SIMD, 50: QP BFP, 52: String */ > @@ -288,6 +288,10 @@ static void spapr_dt_pa_features(SpaprMachineState *spapr, > * SSO (SAO) ordering is supported on KVM and thread=single hosts, > * but not MTTCG, so disable it. To advertise it, a cap would have > * to be added, or support implemented for MTTCG. > + * > + * Copy/paste is not supported by TCG, so it is not advertised. KVM > + * can execute them but it has no accelerator drivers which are usable, > + * so there isn't much need for it anyway. > */ If doing a re-spin, you may consider comments on prev patch applicable above as well. Either ways, with prev typo fixed: Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com> > > if (ppc_hash64_has(cpu, PPC_HASH64_CI_LARGEPAGE)) {
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 5099f12cc6..7d7da30f60 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -254,8 +254,8 @@ static void spapr_dt_pa_features(SpaprMachineState *spapr, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, /* 24 - 29 */ /* 30: MMR, 32: LE atomic, 34: EBB + ext EBB */ 0x80, 0x00, 0x80, 0x00, 0xC0, 0x00, /* 30 - 35 */ - /* 36: SPR SO, 38: Copy/Paste, 40: Radix MMU */ - 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, /* 36 - 41 */ + /* 36: SPR SO, 40: Radix MMU */ + 0x80, 0x00, 0x00, 0x00, 0x80, 0x00, /* 36 - 41 */ /* 42: PM, 44: PC RA, 46: SC vec'd */ 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, /* 42 - 47 */ /* 48: SIMD, 50: QP BFP, 52: String */ @@ -288,6 +288,10 @@ static void spapr_dt_pa_features(SpaprMachineState *spapr, * SSO (SAO) ordering is supported on KVM and thread=single hosts, * but not MTTCG, so disable it. To advertise it, a cap would have * to be added, or support implemented for MTTCG. + * + * Copy/paste is not supported by TCG, so it is not advertised. KVM + * can execute them but it has no accelerator drivers which are usable, + * so there isn't much need for it anyway. */ if (ppc_hash64_has(cpu, PPC_HASH64_CI_LARGEPAGE)) {
TCG does not support copy/paste instructions. Remove it from ibm,pa-features. This has never been implemented under TCG or practically usable under KVM, so it won't be missed. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> --- hw/ppc/spapr.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)