On Fri, 29 Mar 2024 00:13:43 +0000, Mark Brown <[email protected]> wrote: > > The 2023 architecture extensions have allocated some new ID registers, add > them to the KVM system register descriptions so that they are visible to > guests. > > We make the newly introduced dpISA features writeable, as well as > allowing writes to ID_AA64ISAR3_EL1.CPA for FEAT_CPA which only > introduces straigforward new instructions with no additional > architectural state or traps.
FPMR actively gets trapped by HCRX_EL2. > > Signed-off-by: Mark Brown <[email protected]> > --- > arch/arm64/kvm/sys_regs.c | 11 ++++++++--- > 1 file changed, 8 insertions(+), 3 deletions(-) > > diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c > index c9f4f387155f..a3c20d1a36aa 100644 > --- a/arch/arm64/kvm/sys_regs.c > +++ b/arch/arm64/kvm/sys_regs.c > @@ -2293,12 +2293,15 @@ static const struct sys_reg_desc sys_reg_descs[] = { > ID_AA64PFR0_EL1_AdvSIMD | > ID_AA64PFR0_EL1_FP), }, > ID_SANITISED(ID_AA64PFR1_EL1), > - ID_UNALLOCATED(4,2), > + ID_WRITABLE(ID_AA64PFR2_EL1, ~(ID_AA64PFR2_EL1_RES0 | > + ID_AA64PFR2_EL1_MTEFAR | > + ID_AA64PFR2_EL1_MTESTOREONLY | > + ID_AA64PFR2_EL1_MTEPERM)), > ID_UNALLOCATED(4,3), > ID_WRITABLE(ID_AA64ZFR0_EL1, ~ID_AA64ZFR0_EL1_RES0), > ID_HIDDEN(ID_AA64SMFR0_EL1), > ID_UNALLOCATED(4,6), > - ID_UNALLOCATED(4,7), > + ID_WRITABLE(ID_AA64FPFR0_EL1, ~ID_AA64FPFR0_EL1_RES0), > > /* CRm=5 */ > { SYS_DESC(SYS_ID_AA64DFR0_EL1), > @@ -2325,7 +2328,9 @@ static const struct sys_reg_desc sys_reg_descs[] = { > ID_WRITABLE(ID_AA64ISAR2_EL1, ~(ID_AA64ISAR2_EL1_RES0 | > ID_AA64ISAR2_EL1_APA3 | > ID_AA64ISAR2_EL1_GPA3)), > - ID_UNALLOCATED(6,3), > + ID_WRITABLE(ID_AA64ISAR3_EL1, ~(ID_AA64ISAR2_EL1_RES0 | > + ID_AA64ISAR3_EL1_PACM | > + ID_AA64ISAR3_EL1_TLBIW)), > ID_UNALLOCATED(6,4), > ID_UNALLOCATED(6,5), > ID_UNALLOCATED(6,6), > Where is the code that enforces the lack of support for MTEFAR, MTESTOREONLY, and MTEPERM for SCTLR_ELx, EnPACM and EnFPM in HCRX_EL2? And I haven't checked whether TLBI VMALLWS2 can be trapped. M. -- Without deviation from the norm, progress is not possible.
