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MPAMHCR_EL2, MPAM Hypervisor Control Register (EL2)

The MPAMHCR_EL2 characteristics are:

Purpose

MPAMHCR_EL2 controls the PARTID virtualization features of MPAM. It controls the mapping of virtual PARTIDs into physical PARTIDs in MPAM0_EL1 when EL0_VPMEN == 1 and in MPAM1_EL1 when EL1_VPMEN == 1.

Configuration

This register is present only when MPAM is implemented and MPAMIDR_EL1.HAS_HCR == 1. Otherwise, direct accesses to MPAMHCR_EL2 are UNDEFINED.

This register has no effect if EL2 is not enabled in the current Security state.

Some or all RW fields of this register have defined reset values. These apply only if the PE resets into an Exception level that is using AArch64. Otherwise, RW fields in this register reset to architecturally UNKNOWN values.

Attributes

MPAMHCR_EL2 is a 64-bit register.

Field descriptions

The MPAMHCR_EL2 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
RES0
TRAP_MPAMIDR_EL1RES0GSTAPP_PLKRES0EL1_VPMENEL0_VPMEN
313029282726252423222120191817161514131211109876543210

Bits [63:32]

Reserved, RES0.

TRAP_MPAMIDR_EL1, bit [31]

Trap accesses from EL1 to MPAMIDR_EL1 to EL2.

TRAP_MPAMIDR_EL1Meaning
0b0

EL1 accesses to MPAMIDR_EL1 return its value and do not trap to EL2.

0b1

EL1 accesses to MPAMIDR_EL1 trap to EL2.

When EL3 is not implemented, this field is reset to 1. When EL3 is implemented, this field resets to UNKNOWN.

Bits [30:9]

Reserved, RES0.

GSTAPP_PLK, bit [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.

GSTAPP_PLKMeaning
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.

This field resets to an architecturally UNKNOWN value.

Bits [7:2]

Reserved, RES0.

EL1_VPMEN, bit [1]

Enable the virtual PARTID mapping of the PARTID fields in MPAM1_EL1 when executing at EL1. This bit also enables virtual PARTID mapping when MPAM1_EL1 is used to generate MPAM labels for memory requests at EL0 due to GSTAPP_PLK == 1.

EL1_VPMENMeaning
0b0

MPAM1_EL1.PARTID_I and MPAM1_EL1.PARTID_D are physical PARTIDs that are used to label memory system requests.

0b1

MPAM1_EL1.PARTID_I and MPAM1_EL1.PARTID_D are virtual PARTIDs that are used to index the PhyPARTID fields of MPAMVPM0_EL2 to MPAMVPM7_EL2 registers to map the virtual PARTID into a physical PARTID to label memory system requests.

This field resets to an architecturally UNKNOWN value.

EL0_VPMEN, bit [0]

Enable the virtual PARTID mapping of the PARTID fields of MPAM0_EL1 unless HCR_EL2.E2H == '1' and HCR_EL2.TGE == '1'.

When HCR_EL2.E2H == '1' and HCR_EL2.TGE == '1', EL0_VPMEN is ignored and MPAM0_EL1 PARTID fields are not mapped.

When MPAMHCR_EL2.GSTAPP_PLK == '1' and HCR_EL2.TGE == '0', MPAM1_EL1 is used as the source of PARTIDs and the virtual PARTID mapping of MPAM1_EL1 PARTIDs is controlled by MPAMHCR_EL2.EL1_VPMEN.

EL0_VPMENMeaning
0b0

MPAM0_EL1.PARTID_I and MPAM0_EL1.PARTID_D are physical PARTIDs that are used to label memory system requests.

0b1

MPAM0_EL1.PARTID_I and MPAM0_EL1.PARTID_D are virtual PARTIDs that are used to index the PhyPARTID fields of MPAMVPM0_EL2 to MPAMVPM7_EL2 registers to map the virtual PARTID into a physical PARTID to label memory system requests.

This field resets to an architecturally UNKNOWN value.

Accessing the MPAMHCR_EL2

Accesses to this register use the following encodings:

MRS <Xt>, MPAMHCR_EL2

op0op1CRnCRmop2
0b110b1000b10100b01000b000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && HCR_EL2.<NV2,NV> == '11' then
        return NVMem[0x930];
    elsif EL2Enabled() && HCR_EL2.NV == '1' then
        if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then
            AArch64.SystemAccessTrap(EL3, 0x18);
        else
            AArch64.SystemAccessTrap(EL2, 0x18);
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return MPAMHCR_EL2;
elsif PSTATE.EL == EL3 then
    return MPAMHCR_EL2;
              

MSR MPAMHCR_EL2, <Xt>

op0op1CRnCRmop2
0b110b1000b10100b01000b000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && HCR_EL2.<NV2,NV> == '11' then
        NVMem[0x930] = X[t];
    elsif EL2Enabled() && HCR_EL2.NV == '1' then
        if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then
            AArch64.SystemAccessTrap(EL3, 0x18);
        else
            AArch64.SystemAccessTrap(EL2, 0x18);
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        MPAMHCR_EL2 = X[t];
elsif PSTATE.EL == EL3 then
    MPAMHCR_EL2 = X[t];
              


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