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SubjectRe: [RFC PATCH 21/21] KVM: x86: Add capability to grant VM access to privileged SGX attribute
On Fri, Jul 26, 2019 at 10:52 PM Sean Christopherson
<> wrote:
> The SGX subsystem restricts access to a subset of enclave attributes to
> provide additional security for an uncompromised kernel, e.g. to prevent
> malware from using the PROVISIONKEY to ensure its nodes are running
> inside a geniune SGX enclave and/or to obtain a stable fingerprint.
> To prevent userspace from circumventing such restrictions by running an
> enclave in a VM, KVM restricts guest access to privileged attributes by
> default. Add a capability, KVM_CAP_SGX_ATTRIBUTE, that can be used by
> userspace to grant a VM access to a priveleged attribute, with args[0]
> holding a file handle to a valid SGX attribute file corresponding to
> an attribute that is restricted by KVM (currently only PROVISIONKEY).

Looks good to me. Thanks!

> +can use KVM_CAP_SGX_ATTRIBUTE to grant a VM access to a priveleged attribute.


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