Commit 6ebbdecf authored by Anup Patel's avatar Anup Patel Committed by Anup Patel
Browse files

RISC-V: KVM: Add ONE_REG interface for mvendorid, marchid, and mimpid 



We add ONE_REG interface for VCPU mvendorid, marchid, and mimpid
so that KVM user-space can change this details to support migration
across heterogeneous hosts.

Signed-off-by: default avatarAnup Patel <apatel@ventanamicro.com>
Reviewed-by: default avatarAtish Patra <atishp@rivosinc.com>
Reviewed-by: default avatarAndrew Jones <ajones@ventanamicro.com>
Signed-off-by: default avatarAnup Patel <anup@brainfault.org>
parent 52ec4b69

arch/riscv/include/uapi/asm/kvm.h

+3 −0
Original line number Diff line number Diff line
@@ -49,6 +49,9 @@ struct kvm_sregs { 
struct kvm_riscv_config {

	unsigned long isa;

	unsigned long zicbom_block_size;

	unsigned long mvendorid;

	unsigned long marchid;

	unsigned long mimpid;

};



/* CORE registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */

arch/riscv/kvm/vcpu.c

+27 −0
Original line number Diff line number Diff line
@@ -276,6 +276,15 @@ static int kvm_riscv_vcpu_get_reg_config(struct kvm_vcpu *vcpu, 
			return -EINVAL;

		reg_val = riscv_cbom_block_size;

		break;

	case KVM_REG_RISCV_CONFIG_REG(mvendorid):

		reg_val = vcpu->arch.mvendorid;

		break;

	case KVM_REG_RISCV_CONFIG_REG(marchid):

		reg_val = vcpu->arch.marchid;

		break;

	case KVM_REG_RISCV_CONFIG_REG(mimpid):

		reg_val = vcpu->arch.mimpid;

		break;

	default:

		return -EINVAL;

	}
@@ -338,6 +347,24 @@ static int kvm_riscv_vcpu_set_reg_config(struct kvm_vcpu *vcpu, 
		break;

	case KVM_REG_RISCV_CONFIG_REG(zicbom_block_size):

		return -EOPNOTSUPP;

	case KVM_REG_RISCV_CONFIG_REG(mvendorid):

		if (!vcpu->arch.ran_atleast_once)

			vcpu->arch.mvendorid = reg_val;

		else

			return -EBUSY;

		break;

	case KVM_REG_RISCV_CONFIG_REG(marchid):

		if (!vcpu->arch.ran_atleast_once)

			vcpu->arch.marchid = reg_val;

		else

			return -EBUSY;

		break;

	case KVM_REG_RISCV_CONFIG_REG(mimpid):

		if (!vcpu->arch.ran_atleast_once)

			vcpu->arch.mimpid = reg_val;

		else

			return -EBUSY;

		break;

	default:

		return -EINVAL;

	}