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Subject: Re: [PATCH v1 01/15] nitro_enclaves: Add ioctl interface definition
To:     Randy Dunlap <rdunlap@infradead.org>,
        Andra Paraschiv <andraprs@amazon.com>,
        linux-kernel@vger.kernel.org
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        Martin Pohlack <mpohlack@amazon.de>,
        Matt Wilson <msw@amazon.com>, Balbir Singh <sblbir@amazon.com>,
        Stewart Smith <trawets@amazon.com>,
        Uwe Dannowski <uwed@amazon.de>, kvm@vger.kernel.org,
        ne-devel-upstream@amazon.com
References: <20200421184150.68011-1-andraprs@amazon.com>
 <20200421184150.68011-2-andraprs@amazon.com>
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From:   Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <716e0cfb-fa4a-5fc5-f198-6574fa8dc046@redhat.com>
Date:   Tue, 21 Apr 2020 23:45:52 +0200
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On 21/04/20 20:47, Randy Dunlap wrote:
>> +
>> +/**
>> + * The command is used to trigger enclave start after the enclave resources,
>> + * such as memory and CPU, have been set.
>> + *
>> + * The enclave start metadata is an in / out data structure. It includes
>> + * provided info by the caller - enclave cid and flags - and returns the
>> + * slot uid and the cid (if input cid is 0).
>> + */
>> +#define NE_ENCLAVE_START _IOWR('B', 0x1, struct enclave_start_metadata)
> Please document ioctl major ('B' in this case) and range used in
> Documentation/userspace-api/ioctl/ioctl-number.rst.
> 

Since it's really just a couple ioctls, I can "donate" part of the KVM
space, for example major 0xAE minor 0x20-0x3f.

Paolo