From: Jethro Beekman <jethro@fortanix.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"x86@kernel.org" <x86@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
"sean.j.christopherson@intel.com"
<sean.j.christopherson@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-sgx@vger.kernel.org" <linux-sgx@vger.kernel.org>,
Andy Lutomirski <luto@amacapital.net>,
Josh Triplett <josh@joshtriplett.org>,
Haitao Huang <haitao.huang@linux.intel.com>,
"Dr . Greg Wettstein" <greg@enjellic.com>
Subject: Re: x86/sgx: uapi change proposal
Date: Wed, 19 Dec 2018 09:36:16 +0000 [thread overview]
Message-ID: <613c6814-4e71-38e5-444a-545f0e286df8@fortanix.com> (raw)
In-Reply-To: <20181219091148.GA5121@linux.intel.com>
[-- Attachment #1: Type: text/plain, Size: 1602 bytes --]
On 2018-12-19 14:41, Jarkko Sakkinen wrote:
> On Wed, Dec 19, 2018 at 08:41:12AM +0000, Jethro Beekman wrote:
>> One weird thing is the departure from the normal mmap behavior that the
>> memory mapping persists even if the original fd is closed. (See man mmap:
>> "closing the file descriptor does not unmap the region.")
>
> The mmapped region and enclave would be completely disjoint to start
> with. The enclave driver code would assume that an enclave VMA exists
> when it maps enclave address space to a process.
>
> I.e. VMA would no longer reference to the enclave or vice versa but
> you would still create an enclave VMA with mmap().
>
> This is IMHO very clear and well-defined semantics.
>
>>> struct sgx_enclave_add_page {
>>> __u64 enclave_fd;
>>> __u64 src;
>>> __u64 secinfo;
>>> __u16 mrmask;
>>> } __attribute__((__packed__));
>>
>> Wouldn't you just pass enclave_fd as the ioctl fd parameter?
>
> I'm still planning to keep the API in the device fd and use enclave_fd
> as handle to the enclave address space. I don't see any obvious reason
> to change that behavior.
>
> And if we ever add any "global" ioctls, then we would have to define
> APIs to both fd's, which would become a mess.
>
>> How to specify the address of the page that is being added?
>
> Yes, that is correct and my bad to remove it (just quickly drafted what
> I had in mind).
So your plan is that to call EADD, userspace has to pass the device fd
AND the enclave fd AND the enclave address? That seems a little superfluous.
--
Jethro Beekman | Fortanix
[-- Attachment #2: S/MIME Cryptographic Signature --]
[-- Type: application/pkcs7-signature, Size: 3990 bytes --]
next prev parent reply other threads:[~2018-12-19 9:36 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-14 21:57 [RFC PATCH v5 0/5] x86: Add vDSO exception fixup for SGX Sean Christopherson
2018-12-14 21:57 ` [RFC PATCH v5 1/5] x86/vdso: Add support for exception fixup in vDSO functions Sean Christopherson
2018-12-14 21:57 ` [RFC PATCH v5 2/5] x86/fault: Add helper function to sanitize error code Sean Christopherson
2018-12-14 21:57 ` [RFC PATCH v5 3/5] x86/fault: Attempt to fixup unhandled #PF on ENCLU before signaling Sean Christopherson
2018-12-14 21:57 ` [RFC PATCH v5 4/5] x86/traps: Attempt to fixup exceptions in vDSO " Sean Christopherson
2018-12-14 21:57 ` [RFC PATCH v5 5/5] x86/vdso: Add __vdso_sgx_enter_enclave() to wrap SGX enclave transitions Sean Christopherson
2018-12-19 9:21 ` Jarkko Sakkinen
2018-12-18 4:18 ` [RFC PATCH v5 0/5] x86: Add vDSO exception fixup for SGX Jarkko Sakkinen
2018-12-18 15:08 ` Sean Christopherson
2018-12-19 4:43 ` Jarkko Sakkinen
2018-12-19 5:03 ` Jarkko Sakkinen
2018-12-19 7:58 ` x86/sgx: uapi change proposal Jarkko Sakkinen
2018-12-19 8:41 ` Jethro Beekman
2018-12-19 9:11 ` Jarkko Sakkinen
2018-12-19 9:36 ` Jethro Beekman [this message]
2018-12-19 10:43 ` Jarkko Sakkinen
2018-12-19 14:45 ` Sean Christopherson
2018-12-20 2:58 ` Andy Lutomirski
2018-12-20 10:32 ` Jarkko Sakkinen
2018-12-20 13:12 ` Jarkko Sakkinen
2018-12-20 13:19 ` Jarkko Sakkinen
2018-12-22 8:16 ` Jarkko Sakkinen
[not found] ` <20181222082502.GA13275@linux.intel.com>
2018-12-23 12:52 ` Jarkko Sakkinen
2018-12-23 20:42 ` Andy Lutomirski
2018-12-24 11:52 ` Jarkko Sakkinen
2019-01-02 20:47 ` Sean Christopherson
2019-01-03 15:02 ` Jarkko Sakkinen
[not found] ` <20190103162634.GA8610@linux.intel.com>
2019-01-09 14:45 ` Jarkko Sakkinen
2018-12-21 16:28 ` Sean Christopherson
2018-12-21 17:12 ` Andy Lutomirski
2018-12-21 18:24 ` Sean Christopherson
2018-12-21 23:41 ` Jarkko Sakkinen
2018-12-23 20:41 ` Andy Lutomirski
2018-12-24 12:01 ` Jarkko Sakkinen
2018-12-21 23:37 ` Jarkko Sakkinen
2018-12-22 6:32 ` Jarkko Sakkinen
2019-01-08 19:27 ` Huang, Kai
2019-01-08 22:09 ` Sean Christopherson
2019-01-08 22:54 ` Andy Lutomirski
2019-01-09 16:31 ` Sean Christopherson
2019-01-10 21:34 ` Andy Lutomirski
2019-01-10 22:22 ` Huang, Kai
2019-01-10 23:54 ` Sean Christopherson
2019-01-11 0:30 ` Andy Lutomirski
2019-01-11 1:32 ` Sean Christopherson
2019-01-11 12:58 ` Jarkko Sakkinen
2019-01-11 13:00 ` Jarkko Sakkinen
2019-01-11 23:19 ` Sean Christopherson
2019-01-18 14:37 ` Jarkko Sakkinen
2019-01-10 17:45 ` Jarkko Sakkinen
2019-01-10 21:36 ` Andy Lutomirski
2019-01-11 16:07 ` Jarkko Sakkinen
2019-01-09 5:24 ` Huang, Kai
2019-01-09 17:16 ` Sean Christopherson
2019-01-10 0:21 ` Huang, Kai
2019-01-10 0:40 ` Sean Christopherson
2019-01-10 17:43 ` Jarkko Sakkinen
2018-12-20 10:30 ` Jarkko Sakkinen
2018-12-19 14:43 ` Dr. Greg
2018-12-20 10:34 ` Jarkko Sakkinen
2018-12-20 22:06 ` Dr. Greg
2018-12-21 13:48 ` Jarkko Sakkinen
2018-12-20 12:08 ` Arnd Bergmann
2018-12-20 12:49 ` Jarkko Sakkinen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=613c6814-4e71-38e5-444a-545f0e286df8@fortanix.com \
--to=jethro@fortanix.com \
--cc=bp@alien8.de \
--cc=dave.hansen@linux.intel.com \
--cc=greg@enjellic.com \
--cc=haitao.huang@linux.intel.com \
--cc=hpa@zytor.com \
--cc=jarkko.sakkinen@linux.intel.com \
--cc=josh@joshtriplett.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-sgx@vger.kernel.org \
--cc=luto@amacapital.net \
--cc=luto@kernel.org \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=sean.j.christopherson@intel.com \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).