On Fri, May 23, 2025 at 3:52 PM Clément Léger cleger@rivosinc.com wrote:
Currently, only the STA extension needed a reset function but that's going to be the case for FWFT as well. Add a reset callback that can be implemented by SBI extensions.
Signed-off-by: Clément Léger cleger@rivosinc.com Reviewed-by: Andrew Jones ajones@ventanamicro.com Reviewed-by: Atish Patra atishp@rivosinc.com
Queued this patch for Linux-6.17
Thanks, Anup
arch/riscv/include/asm/kvm_host.h | 1 - arch/riscv/include/asm/kvm_vcpu_sbi.h | 2 ++ arch/riscv/kvm/vcpu.c | 2 +- arch/riscv/kvm/vcpu_sbi.c | 24 ++++++++++++++++++++++++ arch/riscv/kvm/vcpu_sbi_sta.c | 3 ++- 5 files changed, 29 insertions(+), 3 deletions(-)
diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h index 0e9c2fab6378..4fa02e082142 100644 --- a/arch/riscv/include/asm/kvm_host.h +++ b/arch/riscv/include/asm/kvm_host.h @@ -407,7 +407,6 @@ void __kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu); void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu); bool kvm_riscv_vcpu_stopped(struct kvm_vcpu *vcpu);
-void kvm_riscv_vcpu_sbi_sta_reset(struct kvm_vcpu *vcpu); void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu);
#endif /* __RISCV_KVM_HOST_H__ */ diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm/kvm_vcpu_sbi.h index bcb90757b149..cb68b3a57c8f 100644 --- a/arch/riscv/include/asm/kvm_vcpu_sbi.h +++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h @@ -57,6 +57,7 @@ struct kvm_vcpu_sbi_extension { */ int (*init)(struct kvm_vcpu *vcpu); void (*deinit)(struct kvm_vcpu *vcpu);
void (*reset)(struct kvm_vcpu *vcpu);};
void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run); @@ -78,6 +79,7 @@ bool riscv_vcpu_supports_sbi_ext(struct kvm_vcpu *vcpu, int idx); int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run); void kvm_riscv_vcpu_sbi_init(struct kvm_vcpu *vcpu); void kvm_riscv_vcpu_sbi_deinit(struct kvm_vcpu *vcpu); +void kvm_riscv_vcpu_sbi_reset(struct kvm_vcpu *vcpu);
int kvm_riscv_vcpu_get_reg_sbi_sta(struct kvm_vcpu *vcpu, unsigned long reg_num, unsigned long *reg_val); diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index 2259717e3b89..ec9f44545cea 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -96,7 +96,7 @@ static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu) vcpu->arch.hfence_tail = 0; memset(vcpu->arch.hfence_queue, 0, sizeof(vcpu->arch.hfence_queue));
kvm_riscv_vcpu_sbi_sta_reset(vcpu);
kvm_riscv_vcpu_sbi_reset(vcpu); /* Reset the guest CSRs for hotplug usecase */ if (loaded)diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c index 3139f171c20f..50be079b5528 100644 --- a/arch/riscv/kvm/vcpu_sbi.c +++ b/arch/riscv/kvm/vcpu_sbi.c @@ -536,3 +536,27 @@ void kvm_riscv_vcpu_sbi_deinit(struct kvm_vcpu *vcpu) ext->deinit(vcpu); } }
+void kvm_riscv_vcpu_sbi_reset(struct kvm_vcpu *vcpu) +{
struct kvm_vcpu_sbi_context *scontext = &vcpu->arch.sbi_context;const struct kvm_riscv_sbi_extension_entry *entry;const struct kvm_vcpu_sbi_extension *ext;int idx, i;for (i = 0; i < ARRAY_SIZE(sbi_ext); i++) {entry = &sbi_ext[i];ext = entry->ext_ptr;idx = entry->ext_idx;if (idx < 0 || idx >= ARRAY_SIZE(scontext->ext_status))continue;if (scontext->ext_status[idx] != KVM_RISCV_SBI_EXT_STATUS_ENABLED ||!ext->reset)continue;ext->reset(vcpu);}+}
diff --git a/arch/riscv/kvm/vcpu_sbi_sta.c b/arch/riscv/kvm/vcpu_sbi_sta.c index 5f35427114c1..cc6cb7c8f0e4 100644 --- a/arch/riscv/kvm/vcpu_sbi_sta.c +++ b/arch/riscv/kvm/vcpu_sbi_sta.c @@ -16,7 +16,7 @@ #include <asm/sbi.h> #include <asm/uaccess.h>
-void kvm_riscv_vcpu_sbi_sta_reset(struct kvm_vcpu *vcpu) +static void kvm_riscv_vcpu_sbi_sta_reset(struct kvm_vcpu *vcpu) { vcpu->arch.sta.shmem = INVALID_GPA; vcpu->arch.sta.last_steal = 0; @@ -156,6 +156,7 @@ const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_sta = { .extid_end = SBI_EXT_STA, .handler = kvm_sbi_ext_sta_handler, .probe = kvm_sbi_ext_sta_probe,
.reset = kvm_riscv_vcpu_sbi_sta_reset,};
int kvm_riscv_vcpu_get_reg_sbi_sta(struct kvm_vcpu *vcpu,
2.49.0