arch/riscv/kvm/vcpu_sbi_v01.c

Source file repositories/reference/linux-study-clean/arch/riscv/kvm/vcpu_sbi_v01.c

File Facts

System
Linux kernel
Corpus path
arch/riscv/kvm/vcpu_sbi_v01.c
Extension
.c
Size
3107 bytes
Lines
113
Domain
Architecture Layer
Bucket
arch/riscv
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

for_each_set_bit(i, &hmask, BITS_PER_LONG) {
			rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
			if (!rvcpu)
				continue;
			ret = kvm_riscv_vcpu_set_interrupt(rvcpu, IRQ_VS_SOFT);
			if (ret < 0)
				break;
		}
		break;
	case SBI_EXT_0_1_SHUTDOWN:
		kvm_riscv_vcpu_sbi_system_reset(vcpu, run,
						KVM_SYSTEM_EVENT_SHUTDOWN, 0);
		retdata->uexit = true;
		break;
	case SBI_EXT_0_1_REMOTE_FENCE_I:
	case SBI_EXT_0_1_REMOTE_SFENCE_VMA:
	case SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID:
		if (cp->a0)
			hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0, utrap);
		else
			hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
		if (utrap->scause)
			break;

		if (cp->a7 == SBI_EXT_0_1_REMOTE_FENCE_I)
			kvm_riscv_fence_i(vcpu->kvm, 0, hmask);
		else if (cp->a7 == SBI_EXT_0_1_REMOTE_SFENCE_VMA) {
			vmid = READ_ONCE(vcpu->kvm->arch.vmid.vmid);
			if (cp->a1 == 0 && cp->a2 == 0)
				kvm_riscv_hfence_vvma_all(vcpu->kvm, 0, hmask, vmid);
			else
				kvm_riscv_hfence_vvma_gva(vcpu->kvm, 0, hmask, cp->a1,
							  cp->a2, PAGE_SHIFT, vmid);
		} else {
			vmid = READ_ONCE(vcpu->kvm->arch.vmid.vmid);
			if (cp->a1 == 0 && cp->a2 == 0)
				kvm_riscv_hfence_vvma_asid_all(vcpu->kvm, 0, hmask,
							       cp->a3, vmid);
			else
				kvm_riscv_hfence_vvma_asid_gva(vcpu->kvm, 0, hmask,
							       cp->a1, cp->a2, PAGE_SHIFT,
							       cp->a3, vmid);
		}
		break;
	default:
		retdata->err_val = SBI_ERR_NOT_SUPPORTED;
		break;
	}

	return ret;
}

const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01 = {
	.extid_start = SBI_EXT_0_1_SET_TIMER,
	.extid_end = SBI_EXT_0_1_SHUTDOWN,
	.handler = kvm_sbi_ext_v01_handler,
};

Annotation

Implementation Notes