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From: "Huang, Kai" <kai.huang@intel.com>
To: "Christopherson, Sean J" <sean.j.christopherson@intel.com>,
	"Andy Lutomirski" <luto@kernel.org>
Cc: Jethro Beekman <jethro@fortanix.com>,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	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>,
	"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>,
	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: Tue, 8 Jan 2019 19:27:11 +0000	[thread overview]
Message-ID: <105F7BF4D0229846AF094488D65A0989355A45B6@PGSMSX112.gar.corp.intel.com> (raw)
In-Reply-To: <20181221162825.GB26865@linux.intel.com>

> >
> > Can one of you explain why SGX_ENCLAVE_CREATE is better than just
> > opening a new instance of /dev/sgx for each encalve?
> 
> Directly associating /dev/sgx with an enclave means /dev/sgx can't be used
> to provide ioctl()'s for other SGX-related needs, e.g. to mmap() raw EPC and
> expose it a VM.  Proposed layout in the link below.  I'll also respond to
> Jarkko's question about exposing EPC through /dev/sgx instead of having
> KVM allocate it on behalf of the VM.
> 
> https://lkml.kernel.org/r/20181218185349.GC30082@linux.intel.com

Hi Sean,

Sorry for replying to old email. But IMHO it is not a must that Qemu needs to open some /dev/sgx and allocate/mmap EPC for guest's virtual EPC slot, instead, KVM could create private slot, which is not visible to Qemu, for virtual EPC, and KVM could call core-SGX EPC allocation API directly.

I am not sure what's the good of allowing userspace to alloc/mmap a raw EPC region? Userspace is not allowed to touch EPC anyway, expect enclave code.

To me KVM creates private EPC slot is cleaner than exposing /dev/sgx/epc and allowing userspace to map some raw EPC region. 

Thanks,
-Kai

  parent reply	other threads:[~2019-01-08 20:09 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
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 [this message]
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

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