Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 42c4e0c7 authored by Anup Patel's avatar Anup Patel Committed by Christoffer Dall
Browse files

ARM/ARM64: KVM: Implement KVM_ARM_PREFERRED_TARGET ioctl 



For implementing CPU=host, we need a mechanism for querying
preferred VCPU target type on underlying Host.

This patch implements KVM_ARM_PREFERRED_TARGET vm ioctl which
returns struct kvm_vcpu_init instance containing information
about preferred VCPU target type and target specific features
available for it.

Signed-off-by: default avatarAnup Patel <anup.patel@linaro.org>
Signed-off-by: default avatarPranavkumar Sawargaonkar <pranavkumar@linaro.org>
Signed-off-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
parent 473bdc0e

arch/arm/kvm/arm.c

+13 −0
Original line number Diff line number Diff line
@@ -797,6 +797,19 @@ long kvm_arch_vm_ioctl(struct file *filp, 
			return -EFAULT;

		return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);

	}

	case KVM_ARM_PREFERRED_TARGET: {

		int err;

		struct kvm_vcpu_init init;



		err = kvm_vcpu_preferred_target(&init);

		if (err)

			return err;



		if (copy_to_user(argp, &init, sizeof(init)))

			return -EFAULT;



		return 0;

	}

	default:

		return -EINVAL;

	}

include/uapi/linux/kvm.h

+1 −0
Original line number Diff line number Diff line
@@ -1012,6 +1012,7 @@ struct kvm_s390_ucas_mapping { 
/* VM is being stopped by host */

#define KVM_KVMCLOCK_CTRL	  _IO(KVMIO,   0xad)

#define KVM_ARM_VCPU_INIT	  _IOW(KVMIO,  0xae, struct kvm_vcpu_init)

#define KVM_ARM_PREFERRED_TARGET  _IOR(KVMIO,  0xaf, struct kvm_vcpu_init)

#define KVM_GET_REG_LIST	  _IOWR(KVMIO, 0xb0, struct kvm_reg_list)



#define KVM_DEV_ASSIGN_ENABLE_IOMMU	(1 << 0)