linux-kernel - Re: [PATCH v1 01/15] nitro_enclaves: Add ioctl interface definition

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Date:   Tue, 21 Apr 2020 23:45:52 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Andra Paraschiv <andraprs@...zon.com>,
        linux-kernel@...r.kernel.org
Cc:     Anthony Liguori <aliguori@...zon.com>,
        Benjamin Herrenschmidt <benh@...zon.com>,
        Colm MacCarthaigh <colmmacc@...zon.com>,
        Bjoern Doebel <doebel@...zon.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Frank van der Linden <fllinden@...zon.com>,
        Alexander Graf <graf@...zon.de>,
        Martin Pohlack <mpohlack@...zon.de>,
        Matt Wilson <msw@...zon.com>, Balbir Singh <sblbir@...zon.com>,
        Stewart Smith <trawets@...zon.com>,
        Uwe Dannowski <uwed@...zon.de>, kvm@...r.kernel.org,
        ne-devel-upstream@...zon.com
Subject: Re: [PATCH v1 01/15] nitro_enclaves: Add ioctl interface definition

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