diff options
| author | Anup Patel <apatel@ventanamicro.com> | 2025-08-23 21:29:43 +0530 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2025-09-16 10:54:12 +0530 |
| commit | a6250b18b5df7880b3c26e5d16ca24c31c1be259 (patch) | |
| tree | 91ff57f988fbf17391b880865df76a9362dc7e67 | |
| parent | 83df1d64d663f4bf450a924cf337ff0cb7d63261 (diff) | |
RISC-V: KVM: Introduce feature specific reset for SBI FWFT
The SBI FWFT feature values must be reset upon VCPU reset so
introduce feature specific reset callback for this purpose.
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Nutty Liu <nutty.liu@hotmail.com>
Link: https://lore.kernel.org/r/20250823155947.1354229-3-apatel@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
| -rw-r--r-- | arch/riscv/kvm/vcpu_sbi_fwft.c | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/arch/riscv/kvm/vcpu_sbi_fwft.c b/arch/riscv/kvm/vcpu_sbi_fwft.c index 93bcc8fb45d6..252899f07482 100644 --- a/arch/riscv/kvm/vcpu_sbi_fwft.c +++ b/arch/riscv/kvm/vcpu_sbi_fwft.c @@ -31,6 +31,13 @@ struct kvm_sbi_fwft_feature { bool (*supported)(struct kvm_vcpu *vcpu); /** + * @reset: Reset the feature value irrespective whether feature is supported or not + * + * This callback is mandatory + */ + void (*reset)(struct kvm_vcpu *vcpu); + + /** * @set: Set the feature value * * Return SBI_SUCCESS on success or an SBI error (SBI_ERR_*) @@ -75,6 +82,13 @@ static bool kvm_sbi_fwft_misaligned_delegation_supported(struct kvm_vcpu *vcpu) return misaligned_traps_can_delegate(); } +static void kvm_sbi_fwft_reset_misaligned_delegation(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_config *cfg = &vcpu->arch.cfg; + + cfg->hedeleg &= ~MIS_DELEG; +} + static long kvm_sbi_fwft_set_misaligned_delegation(struct kvm_vcpu *vcpu, struct kvm_sbi_fwft_config *conf, unsigned long value) @@ -124,6 +138,11 @@ static bool kvm_sbi_fwft_pointer_masking_pmlen_supported(struct kvm_vcpu *vcpu) return fwft->have_vs_pmlen_7 || fwft->have_vs_pmlen_16; } +static void kvm_sbi_fwft_reset_pointer_masking_pmlen(struct kvm_vcpu *vcpu) +{ + vcpu->arch.cfg.henvcfg &= ~ENVCFG_PMM; +} + static long kvm_sbi_fwft_set_pointer_masking_pmlen(struct kvm_vcpu *vcpu, struct kvm_sbi_fwft_config *conf, unsigned long value) @@ -189,6 +208,7 @@ static const struct kvm_sbi_fwft_feature features[] = { { .id = SBI_FWFT_MISALIGNED_EXC_DELEG, .supported = kvm_sbi_fwft_misaligned_delegation_supported, + .reset = kvm_sbi_fwft_reset_misaligned_delegation, .set = kvm_sbi_fwft_set_misaligned_delegation, .get = kvm_sbi_fwft_get_misaligned_delegation, }, @@ -196,6 +216,7 @@ static const struct kvm_sbi_fwft_feature features[] = { { .id = SBI_FWFT_POINTER_MASKING_PMLEN, .supported = kvm_sbi_fwft_pointer_masking_pmlen_supported, + .reset = kvm_sbi_fwft_reset_pointer_masking_pmlen, .set = kvm_sbi_fwft_set_pointer_masking_pmlen, .get = kvm_sbi_fwft_get_pointer_masking_pmlen, }, @@ -330,11 +351,16 @@ static void kvm_sbi_ext_fwft_deinit(struct kvm_vcpu *vcpu) static void kvm_sbi_ext_fwft_reset(struct kvm_vcpu *vcpu) { - int i; struct kvm_sbi_fwft *fwft = vcpu_to_fwft(vcpu); + const struct kvm_sbi_fwft_feature *feature; + int i; - for (i = 0; i < ARRAY_SIZE(features); i++) + for (i = 0; i < ARRAY_SIZE(features); i++) { fwft->configs[i].flags = 0; + feature = &features[i]; + if (feature->reset) + feature->reset(vcpu); + } } const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_fwft = { |