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Date:   Fri, 18 Mar 2022 10:06:25 +0100
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Subject: Re: [RFC PATCH v2 09/10] x86/cpu: Call ENCLS[EUPDATESVN] procedure in
 microcode update
Content-Language: en-US
To:     Dave Hansen <dave.hansen@intel.com>,
        Cathy Zhang <cathy.zhang@intel.com>, linux-sgx@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     ashok.raj@intel.com
References: <20220315010300.10199-1-cathy.zhang@intel.com>
 <20220315010300.10199-10-cathy.zhang@intel.com>
 <53e7d3a3-a576-7ef1-fa2d-d170fa1172a1@fortanix.com>
 <e1682971-4821-8e57-3232-de7a72086991@fortanix.com>
 <e121e972-7689-b2f3-5919-746e3a90cb36@intel.com>
From:   Jethro Beekman <jethro@fortanix.com>
In-Reply-To: <e121e972-7689-b2f3-5919-746e3a90cb36@intel.com>
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On 2022-03-16 16:47, Dave Hansen wrote:
> On 3/16/22 03:24, Jethro Beekman wrote:
>>> Doing this automatically and unconditionally during a microcode
>>> update seems undesirable. This requires the userland tooling that
>>> is coordinating the microcode update to be aware of any SGX
>>> enclaves that are running and possibly coordinate sequencing with
>>> the processes containing those enclaves. This coupling does not
>>> exist today.
>> Also, a microcode update may not affect SGX security at all and doing
>> the EUPDATESVN procedure may not be required for this particular
>> update. This case is called out specifically in the EUPDATESVN
>> documentation.
> 
> I don't think Intel provides the metadata for the kernel to tell if an
> update requires an EUPDATESVN procedure or not.  If this is inconvenient
> for you, I'd suggest reporting this to the folks at Intel who can fix
> it.  It doesn't seem like something which they are motivated to fix.

Whether or not metadata is currently made available is orthogonal to creating a mechanism by which userspace can indidate that a particular microcode update shouldn't trigger the EUPDATESVN procedure.

--
Jethro Beekman | Fortanix

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