MPAMHCR_EL2 MPAM Hypervisor Control Register (EL2) when (FEAT_MPAMv1p0 is implemented or FEAT_MPAMv0p1 is implemented) and MPAMIDR_EL1.HAS_HCR == '1' Controls the PARTID virtualization features of MPAM. MPAM This register has no effect if EL2 is not enabled in the current Security state. MPAMHCR_EL2 is a 64-bit register. When FEAT_MPAMv0p1 is implemented or FEAT_MPAMv1p0 is implemented 63 32 63:32 Reserved, RES0. TRAP_MPAMIDR_EL1 31 31 31 Trap accesses from EL1 to MPAMIDR_EL1 to EL2. 0b0 This control does not cause any instructions to be trapped. 0b1 Direct accesses to MPAMIDR_EL1 from EL1 are trapped to EL2. '1' AU 30 9 30:9 Reserved, RES0. GSTAPP_PLK 8 8 8 Make the PARTIDs at EL0 the same as the PARTIDs at EL1. When executing at EL0, EL2 is enabled, HCR_EL2.TGE == 0 and GSTAPP_PLK = 1, MPAM1_EL1 is used instead of MPAM0_EL1 to generate MPAM labels for memory requests. 0b0 MPAM0_EL1 is used to generate MPAM labels when executing at EL0. 0b1 MPAM1_EL1 is used to generate MPAM labels when executing at EL0 with EL2 enabled and HCR_EL2.TGE == 0. Otherwise MPAM0_EL1 is used. AU 7 2 7:2 Reserved, RES0. EL1_VPMEN 1 1 1 Enable virtualized identifiers in MPAM1_EL1 when executing at EL1. This bit also enables virtualized identifiers when MPAM1_EL1 is used to generate MPAM identifiers for memory requests at EL0 due to GSTAPP_PLK == 1. 0b0 MPAM1_EL1.PARTID_I and MPAM1_EL1.PARTID_D are physical PARTIDs used to label memory system requests. 0b1 MPAM1_EL1.PARTID_I and MPAM1_EL1.PARTID_D are virtual PARTIDs used to index the MPAMVPMn_EL2.PhyPARTID fields to map the virtual PARTID into a physical PARTID to label memory system requests. AU EL0_VPMEN 0 0 0 Enable virtualized identifiers in MPAM0_EL1 unless the Effective value of HCR_EL2.{E2H, TGE} is {1, 1}. When the Effective value of HCR_EL2.{E2H, TGE} is {1, 1}, EL0_VPMEN is ignored and MPAM0_EL1 identifiers are not virtualized. When MPAMHCR_EL2.GSTAPP_PLK == 1 and HCR_EL2.TGE == 0, MPAM1_EL1 is used as the source of identifiers and the virtualization of identifiers in MPAM1_EL1 is controlled by MPAMHCR_EL2.EL1_VPMEN. 0b0 MPAM0_EL1.PARTID_I and MPAM0_EL1.PARTID_D are physical PARTIDs used to label memory system requests. 0b1 MPAM0_EL1.PARTID_I and MPAM0_EL1.PARTID_D are virtual PARTIDs used to index the MPAMVPMn_EL2.PhyPARTID fields to map the virtual PARTID into a physical PARTID to label memory system requests. AU When FEAT_MPAMv0p1 is implemented or FEAT_MPAMv1p0 is implemented MRS <Xt>, MPAMHCR_EL2 if !((IsFeatureImplemented(FEAT_MPAMv1p0) || IsFeatureImplemented(FEAT_MPAMv0p1)) && MPAMIDR_EL1().HAS_HCR == '1') then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() IN {'1x1'} then X{64}(t) = NVMem(0x930); elsif EffectiveHCR_EL2_NVx() IN {'xx1'} then if HaveEL(EL3) && (IsFeatureImplemented(FEAT_MPAMv0p1) || IsFeatureImplemented(FEAT_MPAMv1p0)) && MPAM3_EL3().TRAPLOWER == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else AArch64_SystemAccessTrap(EL2, 0x18); end; else Undefined(); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && (IsFeatureImplemented(FEAT_MPAMv0p1) || IsFeatureImplemented(FEAT_MPAMv1p0)) && MPAM3_EL3().TRAPLOWER == '1' then Undefined(); elsif HaveEL(EL3) && (IsFeatureImplemented(FEAT_MPAMv0p1) || IsFeatureImplemented(FEAT_MPAMv1p0)) && MPAM3_EL3().TRAPLOWER == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = MPAMHCR_EL2(); end; elsif PSTATE.EL == EL3 then X{64}(t) = MPAMHCR_EL2(); end; MSR MPAMHCR_EL2, <Xt> if !((IsFeatureImplemented(FEAT_MPAMv1p0) || IsFeatureImplemented(FEAT_MPAMv0p1)) && MPAMIDR_EL1().HAS_HCR == '1') then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() IN {'1x1'} then NVMem(0x930) = X{64}(t); elsif EffectiveHCR_EL2_NVx() IN {'xx1'} then if HaveEL(EL3) && (IsFeatureImplemented(FEAT_MPAMv0p1) || IsFeatureImplemented(FEAT_MPAMv1p0)) && MPAM3_EL3().TRAPLOWER == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else AArch64_SystemAccessTrap(EL2, 0x18); end; else Undefined(); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && (IsFeatureImplemented(FEAT_MPAMv0p1) || IsFeatureImplemented(FEAT_MPAMv1p0)) && MPAM3_EL3().TRAPLOWER == '1' then Undefined(); elsif HaveEL(EL3) && (IsFeatureImplemented(FEAT_MPAMv0p1) || IsFeatureImplemented(FEAT_MPAMv1p0)) && MPAM3_EL3().TRAPLOWER == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else MPAMHCR_EL2() = X{64}(t); end; elsif PSTATE.EL == EL3 then MPAMHCR_EL2() = X{64}(t); end; 2026-03-26 20:27:25 2026-03_rel