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Re: [PATCH v6 16/18] s390x: Add unpack facility feature to GA1

From: David Hildenbrand
Subject: Re: [PATCH v6 16/18] s390x: Add unpack facility feature to GA1
Date: Fri, 6 Mar 2020 11:22:42 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 06.03.20 11:14, Janosch Frank wrote:
> On 3/4/20 12:42 PM, Janosch Frank wrote:
>> From: Christian Borntraeger <address@hidden>
>> The unpack facility is an indication that diagnose 308 subcodes 8-10
>> are available to the guest. That means, that the guest can put itself
>> into protected mode.
>> Once it is in protected mode, the hardware stops any attempt of VM
>> introspection by the hypervisor.
>> Some features are currently not supported in protected mode:
>>      * Passthrough devices
>>      * Migration
>>      * Huge page backings
>> Signed-off-by: Christian Borntraeger <address@hidden>
> This one will be the first patch (after sync) and will also get the
> DEF_FEAT definition, so I can use it in the diag 308 8-10 patch

You should still enable the whole machinery only after everything has
been implemented. Moving the feature is fine.


David / dhildenb

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