linux-kernel - Re: [PATCH v3 05/25] x86/sgx: Introduce virtual EPC for use by KVM guests

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Date:   Fri, 26 Mar 2021 08:35:34 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     seanjc@...gle.com, Kai Huang <kai.huang@...el.com>,
        kvm@...r.kernel.org, x86@...nel.org, linux-sgx@...r.kernel.org,
        linux-kernel@...r.kernel.org, jarkko@...nel.org, luto@...nel.org,
        rick.p.edgecombe@...el.com, haitao.huang@...el.com,
        pbonzini@...hat.com, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com
Subject: Re: [PATCH v3 05/25] x86/sgx: Introduce virtual EPC for use by KVM
 guests

On 3/26/21 8:29 AM, Borislav Petkov wrote:
> On Fri, Mar 26, 2021 at 08:17:38AM -0700, Dave Hansen wrote:
>> We're working on a cgroup controller just for enclave pages that will
>> apply to guest use and bare metal.  It would have been nice to have up
>> front, but we're trying to do things incrementally.  A cgroup controller
>> should solve he vast majority of these issues where users are quarreling
>> about who gets enclave memory.
> Maybe I'm missing something but why do you need a cgroup controller
> instead of controlling that resource sharing in the sgx core? Or the
> cgroup thing has additional functionality which is good to have anyway?

We could do it in the SGX core, but I think what we end up with will end
up looking a lot like a cgroup controller.  It seems like overkill, but
I think there's enough infrastructure to leverage that it's simpler to
do it with cgroups versus anything else.