From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
x86@kernel.org, platform-driver-x86@vger.kernel.org
Cc: dave.hansen@intel.com, nhorman@redhat.com, npmccallum@redhat.com,
linux-sgx@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Suresh Siddha <suresh.b.siddha@intel.com>,
Serge Ayoun <serge.ayoun@intel.com>,
"open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v13 09/13] x86/sgx: Enclave Page Cache (EPC) memory manager
Date: Tue, 11 Sep 2018 08:04:39 -0700 [thread overview]
Message-ID: <1536678279.5992.9.camel@intel.com> (raw)
In-Reply-To: <20180827185507.17087-10-jarkko.sakkinen@linux.intel.com>
On Mon, 2018-08-27 at 21:53 +0300, Jarkko Sakkinen wrote:
> Add a Enclave Page Cache (EPC) memory manager that can be used to
> allocate and free EPC pages. The swapper thread ksgxswapd reclaims pages
> on the event when the number of free EPC pages goes below
> %SGX_NR_LOW_PAGES up until it reaches %SGX_NR_HIGH_PAGES.
>
> Pages are reclaimed in LRU fashion from a global list. The consumers
> take care of calling EBLOCK (block page from new accesses), ETRACK
> (restart counting the entering hardware threads) and EWB (write page to
> the regular memory) because executing these operations usually (if not
> always) requires to do some subsystem-internal locking operations.
>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> Co-developed-by: Sean Christopherson <sean.j.christopherson@intel.com>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---
> arch/x86/include/asm/sgx.h | 56 ++++--
> arch/x86/kernel/cpu/intel_sgx.c | 322 ++++++++++++++++++++++++++++++++
> 2 files changed, 362 insertions(+), 16 deletions(-)
...
> +/**
> + * sgx_reclaim_pages - reclaim EPC pages from the consumers
> + *
> + * Takes a fixed chunk of pages from the global list of consumed EPC pages and
> + * tries to swap them. Only the pages that are either being freed by the
> + * consumer or actively used are skipped.
> + */
> +static void sgx_reclaim_pages(void)
> +{
> + struct sgx_epc_page *chunk[SGX_NR_TO_SCAN + 1];
The array size should simply be SGX_NR_TO_SCAN. The +1 is a remnant
from the previous version that bounded the for-loops with "!chunk[i]"
check instead of "i < j". No functional issue, essentially just an
unused variable.
> + struct sgx_epc_page *epc_page;
> + struct sgx_epc_bank *bank;
> + int i, j;
> +
> + spin_lock(&sgx_active_page_list_lock);
> + for (i = 0, j = 0; i < SGX_NR_TO_SCAN; i++) {
> + if (list_empty(&sgx_active_page_list))
> + break;
> +
> + epc_page = list_first_entry(&sgx_active_page_list,
> + struct sgx_epc_page, list);
> + list_del_init(&epc_page->list);
> +
> + if (epc_page->impl->ops->get(epc_page))
> + chunk[j++] = epc_page;
> + else
> + epc_page->desc &= ~SGX_EPC_PAGE_RECLAIMABLE;
> + }
> + spin_unlock(&sgx_active_page_list_lock);
> +
> + for (i = 0; i < j; i++) {
> + epc_page = chunk[i];
> + if (epc_page->impl->ops->reclaim(epc_page))
> + continue;
> +
> + spin_lock(&sgx_active_page_list_lock);
> + list_add_tail(&epc_page->list, &sgx_active_page_list);
> + spin_unlock(&sgx_active_page_list_lock);
> +
> + epc_page->impl->ops->put(epc_page);
> + chunk[i] = NULL;
> + }
> +
> + for (i = 0; i < j; i++) {
> + epc_page = chunk[i];
> + if (epc_page)
> + epc_page->impl->ops->block(epc_page);
> + }
> +
> + for (i = 0; i < j; i++) {
> + epc_page = chunk[i];
> + if (epc_page) {
> + epc_page->impl->ops->write(epc_page);
> + epc_page->impl->ops->put(epc_page);
> +
> + /*
> + * Put the page back on the free list only after we
> + * have put() our reference to the owner of the EPC
> + * page, otherwise the page could be re-allocated and
> + * we'd call put() on the wrong impl.
> + */
> + epc_page->desc &= ~SGX_EPC_PAGE_RECLAIMABLE;
> +
> + bank = sgx_epc_bank(epc_page);
> + spin_lock(&bank->lock);
> + bank->pages[bank->free_cnt++] = epc_page;
> + spin_unlock(&bank->lock);
> + }
> + }
> +}
next prev parent reply other threads:[~2018-09-11 15:04 UTC|newest]
Thread overview: 103+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-27 18:53 [PATCH v13 00/13] Intel SGX1 support Jarkko Sakkinen
2018-08-27 18:53 ` [PATCH v13 01/13] x86/sgx: Update MAINTAINERS Jarkko Sakkinen
2018-09-03 12:56 ` Andy Shevchenko
2018-09-03 19:10 ` Jarkko Sakkinen
2018-08-27 18:53 ` [PATCH v13 02/13] x86/cpufeature: Add SGX and SGX_LC CPU features Jarkko Sakkinen
2018-08-28 0:07 ` Huang, Kai
2018-08-28 7:17 ` Jarkko Sakkinen
2018-08-29 7:36 ` Huang, Kai
2018-08-31 12:19 ` Jarkko Sakkinen
2018-08-31 16:18 ` Dr. Greg
2018-08-27 18:53 ` [PATCH v13 03/13] x86/cpufeatures: Add Intel-defined SGX leaf CPUID_12_EAX Jarkko Sakkinen
2018-08-27 19:39 ` Dave Hansen
2018-08-28 7:23 ` Jarkko Sakkinen
2018-08-28 10:21 ` Borislav Petkov
2018-08-28 10:38 ` Jarkko Sakkinen
2018-08-27 18:53 ` [PATCH v13 04/13] x86/sgx: Architectural structures Jarkko Sakkinen
2018-08-27 19:41 ` Dave Hansen
2018-08-28 8:08 ` Jarkko Sakkinen
2018-09-03 13:16 ` Andy Shevchenko
2018-09-03 19:17 ` Jarkko Sakkinen
2018-09-04 16:04 ` Dave Hansen
2018-09-04 16:06 ` Andy Shevchenko
2018-09-05 17:32 ` Jarkko Sakkinen
2018-08-27 18:53 ` [PATCH v13 05/13] x86/msr: Add SGX definitions to msr-index.h Jarkko Sakkinen
2018-08-27 19:42 ` Dave Hansen
2018-08-28 8:11 ` Jarkko Sakkinen
2018-08-27 18:53 ` [PATCH v13 06/13] x86/sgx: Detect Intel SGX Jarkko Sakkinen
2018-08-27 19:53 ` Dave Hansen
2018-08-28 8:28 ` Jarkko Sakkinen
2018-09-03 14:26 ` Andy Shevchenko
2018-09-04 9:56 ` Jarkko Sakkinen
2018-08-27 18:53 ` [PATCH v13 07/13] x86/sgx: Add data structures for tracking the EPC pages Jarkko Sakkinen
2018-08-27 21:07 ` Dave Hansen
2018-08-28 10:30 ` Jarkko Sakkinen
2018-08-28 16:53 ` Dave Hansen
2018-08-28 21:34 ` Sean Christopherson
2018-08-31 11:13 ` Jarkko Sakkinen
2018-08-31 11:10 ` Jarkko Sakkinen
2018-09-03 14:41 ` Andy Shevchenko
2018-09-04 9:59 ` Jarkko Sakkinen
2018-09-04 17:49 ` Sean Christopherson
2018-09-04 18:01 ` Andy Shevchenko
2018-09-04 18:17 ` Sean Christopherson
2018-09-05 17:36 ` Jarkko Sakkinen
2018-08-27 18:53 ` [PATCH v13 08/13] x86/sgx: Add wrappers for ENCLS leaf functions Jarkko Sakkinen
2018-09-03 15:01 ` Andy Shevchenko
2018-09-04 11:09 ` Jarkko Sakkinen
2018-08-27 18:53 ` [PATCH v13 09/13] x86/sgx: Enclave Page Cache (EPC) memory manager Jarkko Sakkinen
2018-08-27 21:14 ` Dave Hansen
2018-08-28 8:36 ` Jarkko Sakkinen
2018-08-27 21:15 ` Dave Hansen
2018-08-28 8:35 ` Jarkko Sakkinen
2018-08-28 14:07 ` Dave Hansen
2018-08-28 21:22 ` Sean Christopherson
2018-08-28 21:26 ` Dave Hansen
2018-08-28 21:52 ` Sean Christopherson
2018-08-31 11:22 ` Jarkko Sakkinen
2018-09-03 19:02 ` Andy Shevchenko
2018-09-04 15:38 ` Jarkko Sakkinen
2018-09-04 15:45 ` Sean Christopherson
2018-09-11 15:04 ` Sean Christopherson [this message]
2018-09-16 11:40 ` Jarkko Sakkinen
2018-08-27 18:53 ` [PATCH v13 10/13] x86/sgx: Add sgx_einit() for initializing enclaves Jarkko Sakkinen
2018-08-27 21:41 ` Huang, Kai
2018-08-28 7:01 ` Jarkko Sakkinen
2018-08-29 7:33 ` Huang, Kai
2018-08-29 20:33 ` Sean Christopherson
2018-08-29 20:58 ` Huang, Kai
2018-08-29 21:09 ` Sean Christopherson
2018-08-30 1:45 ` Huang, Kai
2018-08-31 17:43 ` Sean Christopherson
2018-08-31 21:34 ` Dr. Greg
2018-09-03 19:27 ` Jarkko Sakkinen
2018-09-03 18:15 ` Jarkko Sakkinen
2018-08-31 12:17 ` Jarkko Sakkinen
2018-08-31 18:15 ` Sean Christopherson
2018-09-03 19:19 ` Jarkko Sakkinen
2018-09-03 23:45 ` Huang, Kai
2018-09-04 14:54 ` Sean Christopherson
2018-09-04 15:30 ` Jarkko Sakkinen
2018-09-04 16:35 ` Sean Christopherson
2018-09-04 22:13 ` Huang, Kai
2018-09-05 17:39 ` Jarkko Sakkinen
2018-09-04 15:26 ` Jarkko Sakkinen
2018-09-03 13:53 ` Jann Horn
2018-09-04 9:55 ` Jarkko Sakkinen
2018-09-04 16:05 ` Andy Shevchenko
2018-08-27 18:53 ` [PATCH v13 11/13] platform/x86: Intel SGX driver Jarkko Sakkinen
2018-09-04 17:59 ` Andy Shevchenko
2018-09-05 17:33 ` Jarkko Sakkinen
2018-09-05 17:36 ` Andy Shevchenko
2018-09-06 9:21 ` Jarkko Sakkinen
2018-09-06 17:35 ` Miguel Ojeda
2018-09-07 0:50 ` Joe Perches
2018-09-07 17:02 ` Sean Christopherson
2018-09-10 18:37 ` Jarkko Sakkinen
2018-09-10 21:22 ` Joe Perches
2018-09-10 18:33 ` Jarkko Sakkinen
2018-08-27 18:53 ` [PATCH v13 12/13] platform/x86: ptrace() support for the " Jarkko Sakkinen
2018-08-27 18:53 ` [PATCH v13 13/13] x86/sgx: Driver documentation Jarkko Sakkinen
2018-08-27 19:40 ` Randy Dunlap
2018-08-28 7:58 ` Jarkko Sakkinen
2018-08-28 8:03 ` Jarkko Sakkinen
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