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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2021 Google LLC
* Author: Fuad Tabba <tabba@google.com>
*/
#ifndef __ARM64_KVM_FIXED_CONFIG_H__
#define __ARM64_KVM_FIXED_CONFIG_H__
#include <asm/sysreg.h>
/*
* This file contains definitions for features to be allowed or restricted for
* guest virtual machines, depending on the mode KVM is running in and on the
* type of guest that is running.
*
* The ALLOW masks represent a bitmask of feature fields that are allowed
* without any restrictions as long as they are supported by the system.
*
* The RESTRICT_UNSIGNED masks, if present, represent unsigned fields for
* features that are restricted to support at most the specified feature.
*
* If a feature field is not present in either, than it is not supported.
*
* The approach taken for protected VMs is to allow features that are:
* - Needed by common Linux distributions (e.g., floating point)
* - Trivial to support, e.g., supporting the feature does not introduce or
* require tracking of additional state in KVM
* - Cannot be trapped or prevent the guest from using anyway
*/
/*
* Allow for protected VMs:
* - Floating-point and Advanced SIMD
* - Data Independent Timing
*/
#define PVM_ID_AA64PFR0_ALLOW (\
ARM64_FEATURE_MASK(ID_AA64PFR0_FP) | \
ARM64_FEATURE_MASK(ID_AA64PFR0_ASIMD) | \
ARM64_FEATURE_MASK(ID_AA64PFR0_DIT) \
)
/*
* Restrict to the following *unsigned* features for protected VMs:
* - AArch64 guests only (no support for AArch32 guests):
* AArch32 adds complexity in trap handling, emulation, condition codes,
* etc...
* - RAS (v1)
* Supported by KVM
*/
#define PVM_ID_AA64PFR0_RESTRICT_UNSIGNED (\
FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL0), ID_AA64PFR0_ELx_64BIT_ONLY) | \
FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1), ID_AA64PFR0_ELx_64BIT_ONLY) | \
FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL2), ID_AA64PFR0_ELx_64BIT_ONLY) | \
FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL3), ID_AA64PFR0_ELx_64BIT_ONLY) | \
FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_RAS), ID_AA64PFR0_RAS_V1) \
)
/*
* Allow for protected VMs:
* - Branch Target Identification
* - Speculative Store Bypassing
*/
#define PVM_ID_AA64PFR1_ALLOW (\
ARM64_FEATURE_MASK(ID_AA64PFR1_BT) | \
ARM64_FEATURE_MASK(ID_AA64PFR1_SSBS) \
)
/*
* Allow for protected VMs:
* - Mixed-endian
* - Distinction between Secure and Non-secure Memory
* - Mixed-endian at EL0 only
* - Non-context synchronizing exception entry and exit
*/
#define PVM_ID_AA64MMFR0_ALLOW (\
ARM64_FEATURE_MASK(ID_AA64MMFR0_BIGENDEL) | \
ARM64_FEATURE_MASK(ID_AA64MMFR0_SNSMEM) | \
ARM64_FEATURE_MASK(ID_AA64MMFR0_BIGENDEL0) | \
ARM64_FEATURE_MASK(ID_AA64MMFR0_EXS) \
)
/*
* Restrict to the following *unsigned* features for protected VMs:
* - 40-bit IPA
* - 16-bit ASID
*/
#define PVM_ID_AA64MMFR0_RESTRICT_UNSIGNED (\
FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64MMFR0_PARANGE), ID_AA64MMFR0_PARANGE_40) | \
FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64MMFR0_ASID), ID_AA64MMFR0_ASID_16) \
)
/*
* Allow for protected VMs:
* - Hardware translation table updates to Access flag and Dirty state
* - Number of VMID bits from CPU
* - Hierarchical Permission Disables
* - Privileged Access Never
* - SError interrupt exceptions from speculative reads
* - Enhanced Translation Synchronization
*/
#define PVM_ID_AA64MMFR1_ALLOW (\
ARM64_FEATURE_MASK(ID_AA64MMFR1_HADBS) | \
ARM64_FEATURE_MASK(ID_AA64MMFR1_VMIDBITS) | \
ARM64_FEATURE_MASK(ID_AA64MMFR1_HPD) | \
ARM64_FEATURE_MASK(ID_AA64MMFR1_PAN) | \
ARM64_FEATURE_MASK(ID_AA64MMFR1_SPECSEI) | \
ARM64_FEATURE_MASK(ID_AA64MMFR1_ETS) \
)
/*
* Allow for protected VMs:
* - Common not Private translations
* - User Access Override
* - IESB bit in the SCTLR_ELx registers
* - Unaligned single-copy atomicity and atomic functions
* - ESR_ELx.EC value on an exception by read access to feature ID space
* - TTL field in address operations.
* - Break-before-make sequences when changing translation block size
* - E0PDx mechanism
*/
#define PVM_ID_AA64MMFR2_ALLOW (\
ARM64_FEATURE_MASK(ID_AA64MMFR2_CNP) | \
ARM64_FEATURE_MASK(ID_AA64MMFR2_UAO) | \
ARM64_FEATURE_MASK(ID_AA64MMFR2_IESB) | \
ARM64_FEATURE_MASK(ID_AA64MMFR2_AT) | \
ARM64_FEATURE_MASK(ID_AA64MMFR2_IDS) | \
ARM64_FEATURE_MASK(ID_AA64MMFR2_TTL) | \
ARM64_FEATURE_MASK(ID_AA64MMFR2_BBM) | \
ARM64_FEATURE_MASK(ID_AA64MMFR2_E0PD) \
)
/*
* No support for Scalable Vectors for protected VMs:
* Requires additional support from KVM, e.g., context-switching and
* trapping at EL2
*/
#define PVM_ID_AA64ZFR0_ALLOW (0ULL)
/*
* No support for debug, including breakpoints, and watchpoints for protected
* VMs:
* The Arm architecture mandates support for at least the Armv8 debug
* architecture, which would include at least 2 hardware breakpoints and
* watchpoints. Providing that support to protected guests adds
* considerable state and complexity. Therefore, the reserved value of 0 is
* used for debug-related fields.
*/
#define PVM_ID_AA64DFR0_ALLOW (0ULL)
#define PVM_ID_AA64DFR1_ALLOW (0ULL)
/*
* No support for implementation defined features.
*/
#define PVM_ID_AA64AFR0_ALLOW (0ULL)
#define PVM_ID_AA64AFR1_ALLOW (0ULL)
/*
* No restrictions on instructions implemented in AArch64.
*/
#define PVM_ID_AA64ISAR0_ALLOW (\
ARM64_FEATURE_MASK(ID_AA64ISAR0_AES) | \
ARM64_FEATURE_MASK(ID_AA64ISAR0_SHA1) | \
ARM64_FEATURE_MASK(ID_AA64ISAR0_SHA2) | \
ARM64_FEATURE_MASK(ID_AA64ISAR0_CRC32) | \
ARM64_FEATURE_MASK(ID_AA64ISAR0_ATOMICS) | \
ARM64_FEATURE_MASK(ID_AA64ISAR0_RDM) | \
ARM64_FEATURE_MASK(ID_AA64ISAR0_SHA3) | \
ARM64_FEATURE_MASK(ID_AA64ISAR0_SM3) | \
ARM64_FEATURE_MASK(ID_AA64ISAR0_SM4) | \
ARM64_FEATURE_MASK(ID_AA64ISAR0_DP) | \
ARM64_FEATURE_MASK(ID_AA64ISAR0_FHM) | \
ARM64_FEATURE_MASK(ID_AA64ISAR0_TS) | \
ARM64_FEATURE_MASK(ID_AA64ISAR0_TLB) | \
ARM64_FEATURE_MASK(ID_AA64ISAR0_RNDR) \
)
#define PVM_ID_AA64ISAR1_ALLOW (\
ARM64_FEATURE_MASK(ID_AA64ISAR1_DPB) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_APA) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_API) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_JSCVT) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_FCMA) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_LRCPC) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_GPA) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_GPI) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_FRINTTS) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_SB) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_SPECRES) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_BF16) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_DGH) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_I8MM) \
)
u64 pvm_read_id_reg(const struct kvm_vcpu *vcpu, u32 id);
bool kvm_handle_pvm_sysreg(struct kvm_vcpu *vcpu, u64 *exit_code);
bool kvm_handle_pvm_restricted(struct kvm_vcpu *vcpu, u64 *exit_code);
int kvm_check_pvm_sysreg_table(void);
#endif /* __ARM64_KVM_FIXED_CONFIG_H__ */
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