RISC-V hstateen3 CSR Register

Address 0x60FPrivilege HypervisorAccess HRW / HSXLENHypervisor and virtualization CSRs

hstateen3 is a hypervisor state-enable CSR.

Related Search Terms

hstateen3 CSR hstateen3 0x60F hstateen state enable state enable bits Smstateen

Bit Overview

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bit 3 = only bit 3; bits 12..11 = bits 12 down to 11

MSBLSB

STATE_ENABLE63:0RW

Field Map

Understand hstateen3 By Bit Fields

1 key fields

HSXLEN-1:0

STATE_ENABLE

hstateen3 contains state-enable bits allocated by Smstateen or later extensions; unallocated bits must not be treated as ordinary writable value.

STATE_ENABLE (bits HSXLEN-1:0) — hstateen3 contains state-enable bits allocated by Smstateen or later extensions; unallocated bits must not be treated as ordinary writable value.

What This Field Controls

- hstateen3 contains state-enable bits allocated by Smstateen or later extensions; unallocated bits must not be treated as ordinary writable value.

Common Values

This field is better understood together with surrounding context than as a fixed memorized enumeration.

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Official Basis & Search Notes

hstateen3 is a hypervisor state-enable CSR. It is HS/M-side hypervisor state, not a VS supervisor CSR copy; guest access is governed by the H extension and relevant state-enable, AIA, Sstc, or Smcsrind rules.

hstateen3 address, access class, and width are checked against the official CSR tables: 0x60F, HRW, HSXLEN.

State-enable CSRs control lower-privilege or VM access to extension state; they do not affect M-mode access.

hstateen1-3 bits are allocated by official extensions; unallocated bits must not be treated as ordinary VALUE.

When writing, modify only officially defined fields; handle WARL, WLRL, WPRI, and reserved fields according to the official specification and implementation behavior.

RISC-V Privileged Architecture Manual - CSR table RISC-V Privileged Architecture Manual - Hypervisor extension RISC-V Smstateen/Ssstateen extension RISC-V Advanced Interrupt Architecture CSR chapter RISC-V Smcsrind/Sscsrind indirect CSR extension

What To Check First When Reading This CSR

- hstateen3 is a Hypervisor-level CSR; its separate address is in the official HRW access class.
- Guest/VS software does not reach this H-level CSR through a supervisor CSR alias; access is controlled by the H extension and relevant optional-extension rules.

Risk Checks Before Writing

- When writing hstateen3, modify only officially defined target fields and preserve WPRI, reserved, and unchanged fields.

Put It Back Into A Real Flow

Confirm the current software is in an M/HS context that may access Hypervisor CSRs.

Confirm that the H, AIA, Sstc, Smstateen, Smcsrind, or other defining extension is implemented.

Read or write only official fields; whether guest-related access succeeds or traps is controlled by the corresponding extension rules and state-enable state.

FAQ

Can hstateen3 be accessed through a supervisor CSR alias?

Do not treat hstateen3 as a VS CSR copy. It is an H-level CSR; whether guest/VS access to related functionality traps is defined by the H extension and the relevant optional extension.

What do the AIA/IMSIC/CSRIND bits in hstateen0 control?

They control VM access to AIA, guest IMSIC, and indirect CSR alias state, respectively.