From: Josh Triplett <josh@joshtriplett.org>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"H. Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org, linux-sgx@vger.kernel.org,
Andy Lutomirski <luto@amacapital.net>,
Haitao Huang <haitao.huang@linux.intel.com>,
Jethro Beekman <jethro@fortanix.com>,
"Dr . Greg Wettstein" <greg@enjellic.com>
Subject: Re: [RFC PATCH v3 0/4] x86: Add exception fixup for SGX ENCLU
Date: Mon, 10 Dec 2018 15:24:50 -0800 [thread overview]
Message-ID: <20181210232449.GA11843@localhost> (raw)
In-Reply-To: <20181210232141.5425-1-sean.j.christopherson@intel.com>
On Mon, Dec 10, 2018 at 03:21:37PM -0800, Sean Christopherson wrote:
> At that point I realized it's a hell of a lot easier to simply provide
> an IOCTL via /dev/sgx that allows userspace to register a per-process
> ENCLU exception handler. At a high level, the basic idea is the same
> as the vDSO approach: provide a hardcoded fixup handler for ENCLU and
> attempt to fixup select unhandled exceptions that occurred in user code.
So, on the one hand, this is *absolutely* much cleaner than the VDSO
approach. On the other hand, this is global process state and has some
of the same problems as a signal handler as a result.
next prev parent reply other threads:[~2018-12-10 23:26 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-10 23:21 [RFC PATCH v3 0/4] x86: Add exception fixup for SGX ENCLU Sean Christopherson
2018-12-10 23:21 ` [RFC PATCH v3 1/4] x86/sgx: Add a per-mm ENCLU exception fixup handler Sean Christopherson
2018-12-10 23:21 ` [RFC PATCH v3 2/4] x86/fault: Attempt to fixup unhandled #PF on ENCLU before signaling Sean Christopherson
2018-12-10 23:21 ` [RFC PATCH v3 3/4] x86/traps: Attempt to fixup exceptions in vDSO " Sean Christopherson
2018-12-10 23:21 ` [RFC PATCH v3 4/4] x86/sgx: Add an SGX IOCTL to register a per-mm ENCLU exception handler Sean Christopherson
2018-12-10 23:24 ` Josh Triplett [this message]
2018-12-11 14:53 ` [RFC PATCH v3 0/4] x86: Add exception fixup for SGX ENCLU Dr. Greg
2018-12-11 15:01 ` Sean Christopherson
2018-12-11 15:41 ` Andy Lutomirski
2018-12-11 16:52 ` Sean Christopherson
2018-12-11 17:58 ` Andy Lutomirski
2018-12-11 18:40 ` Sean Christopherson
2018-12-11 22:23 ` Sean Christopherson
2018-12-11 23:10 ` Andy Lutomirski
2018-12-11 23:29 ` Sean Christopherson
2018-12-12 2:42 ` Dr. Greg
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