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| author | Clément Léger <cleger@rivosinc.com> | 2025-05-23 12:19:31 +0200 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2025-09-08 09:52:57 +0530 |
| commit | bb053f816a8bcb0a9135fc4cc611b1cab3d82201 (patch) | |
| tree | 69b8908b46c3533ded2b2794fd4a1e929c75074c | |
| parent | 6b72fd170592ad3fb14cadfa973908e5d63d27c8 (diff) | |
| download | linux-stable-bb053f816a8bcb0a9135fc4cc611b1cab3d82201.tar.gz linux-stable-bb053f816a8bcb0a9135fc4cc611b1cab3d82201.zip | |
RISC-V: KVM: add support for SBI_FWFT_MISALIGNED_DELEG
SBI_FWFT_MISALIGNED_DELEG needs hedeleg to be modified to delegate
misaligned load/store exceptions. Save and restore it during CPU
load/put.
Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Deepak Gupta <debug@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20250523101932.1594077-15-cleger@rivosinc.com
Signed-off-by: Anup Patel <anup@brainfault.org>
| -rw-r--r-- | arch/riscv/kvm/vcpu_sbi_fwft.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/riscv/kvm/vcpu_sbi_fwft.c b/arch/riscv/kvm/vcpu_sbi_fwft.c index b0f66c7bf010..6770c043bbcb 100644 --- a/arch/riscv/kvm/vcpu_sbi_fwft.c +++ b/arch/riscv/kvm/vcpu_sbi_fwft.c @@ -14,6 +14,8 @@ #include <asm/kvm_vcpu_sbi.h> #include <asm/kvm_vcpu_sbi_fwft.h> +#define MIS_DELEG (BIT_ULL(EXC_LOAD_MISALIGNED) | BIT_ULL(EXC_STORE_MISALIGNED)) + struct kvm_sbi_fwft_feature { /** * @id: Feature ID @@ -68,7 +70,46 @@ static bool kvm_fwft_is_defined_feature(enum sbi_fwft_feature_t feature) return false; } +static bool kvm_sbi_fwft_misaligned_delegation_supported(struct kvm_vcpu *vcpu) +{ + return misaligned_traps_can_delegate(); +} + +static long kvm_sbi_fwft_set_misaligned_delegation(struct kvm_vcpu *vcpu, + struct kvm_sbi_fwft_config *conf, + unsigned long value) +{ + struct kvm_vcpu_config *cfg = &vcpu->arch.cfg; + + if (value == 1) { + cfg->hedeleg |= MIS_DELEG; + csr_set(CSR_HEDELEG, MIS_DELEG); + } else if (value == 0) { + cfg->hedeleg &= ~MIS_DELEG; + csr_clear(CSR_HEDELEG, MIS_DELEG); + } else { + return SBI_ERR_INVALID_PARAM; + } + + return SBI_SUCCESS; +} + +static long kvm_sbi_fwft_get_misaligned_delegation(struct kvm_vcpu *vcpu, + struct kvm_sbi_fwft_config *conf, + unsigned long *value) +{ + *value = (csr_read(CSR_HEDELEG) & MIS_DELEG) == MIS_DELEG; + + return SBI_SUCCESS; +} + static const struct kvm_sbi_fwft_feature features[] = { + { + .id = SBI_FWFT_MISALIGNED_EXC_DELEG, + .supported = kvm_sbi_fwft_misaligned_delegation_supported, + .set = kvm_sbi_fwft_set_misaligned_delegation, + .get = kvm_sbi_fwft_get_misaligned_delegation, + }, }; static struct kvm_sbi_fwft_config * |