From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Haitao Huang <haitao.huang@linux.intel.com>
Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
x86@kernel.org, linux-sgx@vger.kernel.org,
linux-kernel@vger.kernel.org,
Jethro Beekman <jethro@fortanix.com>,
Chunyang Hui <sanqian.hcy@antfin.com>,
Jordan Hand <jorhand@linux.microsoft.com>,
Nathaniel McCallum <npmccallum@redhat.com>,
Seth Moore <sethmo@google.com>,
Darren Kenny <darren.kenny@oracle.com>,
Suresh Siddha <suresh.b.siddha@intel.com>,
akpm@linux-foundation.org, andriy.shevchenko@linux.intel.com,
asapek@google.com, bp@alien8.de, cedric.xing@intel.com,
chenalexchen@google.com, conradparker@google.com,
cyhanish@google.com, dave.hansen@intel.com,
haitao.huang@intel.com, josh@joshtriplett.org,
kai.huang@intel.com, kai.svahn@intel.com, kmoy@google.com,
ludloff@google.com, luto@kernel.org, nhorman@redhat.com,
puiterwijk@redhat.com, rientjes@google.com, tglx@linutronix.de,
yaozhangx@google.com
Subject: Re: [PATCH v38 13/24] x86/sgx: Add SGX_IOC_ENCLAVE_ADD_PAGES
Date: Thu, 17 Sep 2020 19:09:40 -0700 [thread overview]
Message-ID: <20200918020940.GA14678@sjchrist-ice> (raw)
In-Reply-To: <op.0q3pw0stwjvjmi@mqcpg7oapc828.gar.corp.intel.com>
On Thu, Sep 17, 2020 at 01:35:10PM -0500, Haitao Huang wrote:
> On Thu, 17 Sep 2020 11:02:06 -0500, Jarkko Sakkinen
> <jarkko.sakkinen@linux.intel.com> wrote:
> >
> > Right, I do get the OOM case but wouldn't in that case the reasonable
> > thing to do destroy the enclave that is not even running? I mean that
> > means that we are globally out of EPC.
> >
>
> I would say it could be a policy, but not the only one. If it does not make
> much difference to kernel, IMHO we should not set it in stone now.
> Debugging is also huge benefit to me.
Agreed, an EPC cgroup is the proper way to define/enforce what happens when
there is EPC pressure. E.g. if process A is consuming 99% of the EPC, then
it doesn't make sense to unconditionally kill enclaves from process B. If
the admin wants to give process A priority, so be it, but such a decision
shouldn't be baked into the kernel.
This series obviously doesn't provide an EPC cgroup, but that doesn't mean
we can't make decisions that will play nice with a cgroup in the future.
next prev parent reply other threads:[~2020-09-18 2:46 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-15 11:04 [PATCH v38 00/24] Intel SGX foundations Jarkko Sakkinen
2020-09-15 11:04 ` [PATCH v38 01/24] x86/cpufeatures: x86/msr: Add Intel SGX hardware bits Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 02/24] x86/cpufeatures: x86/msr: Add Intel SGX Launch Control " Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 03/24] x86/mm: x86/sgx: Signal SIGSEGV with PF_SGX Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 04/24] x86/sgx: Add SGX microarchitectural data structures Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 05/24] x86/sgx: Add wrappers for ENCLS leaf functions Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 06/24] x86/cpu/intel: Detect SGX support Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 07/24] x86/cpu/intel: Add nosgx kernel parameter Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 08/24] x86/sgx: Initialize metadata for Enclave Page Cache (EPC) sections Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 09/24] x86/sgx: Add __sgx_alloc_epc_page() and sgx_free_epc_page() Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 10/24] mm: Add vm_ops->mprotect() Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 11/24] x86/sgx: Add SGX enclave driver Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 12/24] x86/sgx: Add SGX_IOC_ENCLAVE_CREATE Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 13/24] x86/sgx: Add SGX_IOC_ENCLAVE_ADD_PAGES Jarkko Sakkinen
[not found] ` <op.0q2prldowjvjmi@mqcpg7oapc828.gar.corp.intel.com>
2020-09-17 16:02 ` Jarkko Sakkinen
2020-09-17 18:35 ` Haitao Huang
2020-09-18 2:09 ` Sean Christopherson [this message]
2020-09-18 12:20 ` Jarkko Sakkinen
2020-09-18 12:39 ` Jarkko Sakkinen
[not found] ` <20200919000918.GB21189@sjchrist-ice>
2020-09-21 11:41 ` Jarkko Sakkinen
2020-09-21 16:46 ` Sean Christopherson
2020-09-21 18:49 ` Jarkko Sakkinen
2020-09-21 19:44 ` Jarkko Sakkinen
2020-09-21 19:57 ` Sean Christopherson
2020-09-21 21:24 ` Jarkko Sakkinen
2020-09-21 19:58 ` Jarkko Sakkinen
2020-09-17 16:03 ` Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 14/24] x86/sgx: Add SGX_IOC_ENCLAVE_INIT Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 15/24] x86/sgx: Enable provisioning for remote attestation Jarkko Sakkinen
2020-10-01 17:17 ` Sean Christopherson
2020-09-15 11:05 ` [PATCH v38 16/24] x86/sgx: Add a page reclaimer Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 17/24] x86/sgx: ptrace() support for the SGX driver Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 18/24] x86/vdso: Add support for exception fixup in vDSO functions Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 19/24] x86/fault: Add helper function to sanitize error code Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 20/24] x86/traps: Attempt to fixup exceptions in vDSO before signaling Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 21/24] x86/vdso: Implement a vDSO for Intel SGX enclave call Jarkko Sakkinen
2020-09-28 1:32 ` Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 22/24] selftests/x86: Add a selftest for SGX Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 23/24] docs: x86/sgx: Document SGX micro architecture and kernel internals Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 24/24] x86/sgx: Update MAINTAINERS Jarkko Sakkinen
2020-09-15 11:28 [PATCH v38 00/24] Intel SGX foundations Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 13/24] x86/sgx: Add SGX_IOC_ENCLAVE_ADD_PAGES Jarkko Sakkinen
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