MPAMHCR

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 FEAT_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.

Attributes

Field descriptions

Bits [63:32]

TRAP_MPAMIDR_EL1, bit [31]

Trap accesses from EL1 to MPAMIDR_EL1 to EL2.

TRAP_MPAMIDR_EL1	Meaning
0b0	This control does not cause any instructions to be trapped.
0b1	Direct accesses to MPAMIDR_EL1 from EL1 are trapped to EL2.

The reset behavior of this field is:

On a Warm reset:
- When EL3 is not implemented, this field resets to 1.
- When EL3 is implemented, this field resets to an architecturally UNKNOWN value.

Bits [30:9]

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_PLK	Meaning
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.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Bits [7:2]

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_VPMEN	Meaning
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.

The reset behavior of this field is:

On a Warm reset, 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 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 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_VPMEN	Meaning
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.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Accessing MPAMHCR_EL2

Accesses to this register use the following encodings in the System register encoding space:

MRS <Xt>, MPAMHCR_EL2

op0	op1	CRn	CRm	op2
0b11	0b100	0b1010	0b0100	0b000

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() IN {'1x1'} then X[t, 64] = NVMem[0x930]; elsif EffectiveHCR_EL2_NVx() IN {'xx1'} then if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else AArch64.SystemAccessTrap(EL2, 0x18); else UNDEFINED; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = MPAMHCR_EL2; elsif PSTATE.EL == EL3 then X[t, 64] = MPAMHCR_EL2;

MSR MPAMHCR_EL2, <Xt>

op0	op1	CRn	CRm	op2
0b11	0b100	0b1010	0b0100	0b000

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() IN {'1x1'} then NVMem[0x930] = X[t, 64]; elsif EffectiveHCR_EL2_NVx() IN {'xx1'} then if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else AArch64.SystemAccessTrap(EL2, 0x18); else UNDEFINED; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else MPAMHCR_EL2 = X[t, 64]; elsif PSTATE.EL == EL3 then MPAMHCR_EL2 = X[t, 64];

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
RES0
TRAP_MPAMIDR_EL1	RES0																						GSTAPP_PLK	RES0						EL1_VPMEN	EL0_VPMEN

MPAMHCR_EL2, MPAM Hypervisor Control Register (EL2)

Purpose

Configuration

Attributes

Field descriptions

Bits [63:32]

TRAP_MPAMIDR_EL1, bit [31]

Bits [30:9]

GSTAPP_PLK, bit [8]

Bits [7:2]

EL1_VPMEN, bit [1]

EL0_VPMEN, bit [0]

Accessing MPAMHCR_EL2

MRS <Xt>, MPAMHCR_EL2

MSR MPAMHCR_EL2, <Xt>