[PATCH v4 12/25] KVM: arm64: Add infrastructure to create and track pKVM instances at EL2

[Quentin Perret]

On Monday 17 Oct 2022 at 12:51:56 (+0100), Will Deacon wrote:
> +static int find_free_vm_table_entry(struct kvm *host_kvm)
> +{
> +	int i, ret = -ENOMEM;
> +
> +	for (i = 0; i < KVM_MAX_PVMS; ++i) {
> +		struct pkvm_hyp_vm *vm = vm_table[i];
> +
> +		if (!vm) {
> +			if (ret < 0)
> +				ret = i;
> +			continue;
> +		}
> +
> +		if (unlikely(vm->host_kvm == host_kvm)) {
> +			ret = -EEXIST;
> +			break;
> +		}

That would be funny if the host passed the same struct twice, but do we
care? If the host wants to shoot itself in the foot, it's not our
problem I guess :) ? Also, we don't do the same check for vCPUs so ...