From patchwork Tue Jan 30 02:09:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Haitao Huang X-Patchwork-Id: 13536698 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 79E5A37171; Tue, 30 Jan 2024 02:09:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.10 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706580585; cv=none; b=FEmKOyfU3/hR1eYGSfgWCKPLowbWfrh3XNbh4T0dm9f4wiHMlSaeqSmoFO0zanmWYHShrvBCbzGfMdJzgsu28rmBxw+1AmBNv9x80BWh1Utoi2lpqWRsC/+p5e+GJKQEQwzbFJkDigL0i/dnH12+tb78dgQuIT7cYB2azvq4how= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706580585; c=relaxed/simple; bh=riG0vI3pb2HvvMY7hIMcLvUSRS9WHe6ioFIvFSpXVKo=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=jJkqUhETbNyrdhGVn3gJtAtPu8YFeoOb9A4EK+YZ1Kzs+kDnKeuVoxJCj+4N127oOVx/DPWdgg8Rv7AZ5StEZjI/bUEB/QjOZUYE0zLXG+6v6qz6Ftp3zj2oRqAbyNE9hcbjToTI6UsKfjP+zyDx2mCbvM9EvPycKov2FYOsLLA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=E6NIUZBM; arc=none smtp.client-ip=198.175.65.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="E6NIUZBM" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1706580584; x=1738116584; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=riG0vI3pb2HvvMY7hIMcLvUSRS9WHe6ioFIvFSpXVKo=; b=E6NIUZBMX941xXlFOw6bk2EFf6NJrz7q2+u3S+IRyQfw6DjTgogyA3V2 DvL0zYzRhXiCil6Z+trmKW4eKKbXTBCFP+2T5lVk74irPdE3/GNn1XXJh 6EhUiiyTfyH+Xq4nGS+gQhfe1pY2EIkMbMhjtJTzW1F20zNmoRQatTcjl 81397iMisG+pX6BU2RmN5Z624b1JUAy59vjP9RpWe4cdKAhNYW5PG+gac foZiHVuZ075zha48gtS/cSXKXGvPw5KccE7p9nwCXdp7H7VmogorvT17D RDXSqQ8m/8Xmk7xhsIYwV6E01QNYDlQHBEWeV9ntcPC1ogwwk69/NkeyE g==; X-IronPort-AV: E=McAfee;i="6600,9927,10968"; a="16530959" X-IronPort-AV: E=Sophos;i="6.05,707,1701158400"; d="scan'208";a="16530959" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Jan 2024 18:09:40 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10968"; a="822042336" X-IronPort-AV: E=Sophos;i="6.05,707,1701158400"; d="scan'208";a="822042336" Received: from b4969161e530.jf.intel.com ([10.165.56.46]) by orsmga001.jf.intel.com with ESMTP; 29 Jan 2024 18:09:39 -0800 From: Haitao Huang To: jarkko@kernel.org, dave.hansen@linux.intel.com, tj@kernel.org, mkoutny@suse.com, linux-kernel@vger.kernel.org, linux-sgx@vger.kernel.org, x86@kernel.org, cgroups@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, sohil.mehta@intel.com Cc: zhiquan1.li@intel.com, kristen@linux.intel.com, seanjc@google.com, zhanb@microsoft.com, anakrish@microsoft.com, mikko.ylinen@linux.intel.com, yangjie@microsoft.com, chrisyan@microsoft.com Subject: [PATCH v8 06/15] x86/sgx: Abstract tracking reclaimable pages in LRU Date: Mon, 29 Jan 2024 18:09:29 -0800 Message-Id: <20240130020938.10025-7-haitao.huang@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240130020938.10025-1-haitao.huang@linux.intel.com> References: <20240130020938.10025-1-haitao.huang@linux.intel.com> Precedence: bulk X-Mailing-List: linux-sgx@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Kristen Carlson Accardi The functions, sgx_{mark,unmark}_page_reclaimable(), manage the tracking of reclaimable EPC pages: sgx_mark_page_reclaimable() adds a newly allocated page into the global LRU list while sgx_unmark_page_reclaimable() does the opposite. Abstract the hard coded global LRU references in these functions to make them reusable when pages are tracked in per-cgroup LRUs. Create a helper, sgx_lru_list(), that returns the LRU that tracks a given EPC page. It simply returns the global LRU now, and will later return the LRU of the cgroup within which the EPC page was allocated. Replace the hard coded global LRU with a call to this helper. Next patches will first get the cgroup reclamation flow ready while keeping pages tracked in the global LRU and reclaimed by ksgxd before we make the switch in the end for sgx_lru_list() to return per-cgroup LRU. Co-developed-by: Sean Christopherson Signed-off-by: Sean Christopherson Signed-off-by: Kristen Carlson Accardi Co-developed-by: Haitao Huang Signed-off-by: Haitao Huang Reviewed-by: Jarkko Sakkinen --- V7: - Split this out from the big patch, #10 in V6. (Dave, Kai) --- arch/x86/kernel/cpu/sgx/main.c | 30 ++++++++++++++++++------------ 1 file changed, 18 insertions(+), 12 deletions(-) diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index 912959c7ecc9..a131aa985c95 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -32,6 +32,11 @@ static DEFINE_XARRAY(sgx_epc_address_space); */ static struct sgx_epc_lru_list sgx_global_lru; +static inline struct sgx_epc_lru_list *sgx_lru_list(struct sgx_epc_page *epc_page) +{ + return &sgx_global_lru; +} + static atomic_long_t sgx_nr_free_pages = ATOMIC_LONG_INIT(0); /* Nodes with one or more EPC sections. */ @@ -500,25 +505,24 @@ struct sgx_epc_page *__sgx_alloc_epc_page(void) } /** - * sgx_mark_page_reclaimable() - Mark a page as reclaimable + * sgx_mark_page_reclaimable() - Mark a page as reclaimable and track it in a LRU. * @page: EPC page - * - * Mark a page as reclaimable and add it to the active page list. Pages - * are automatically removed from the active list when freed. */ void sgx_mark_page_reclaimable(struct sgx_epc_page *page) { - spin_lock(&sgx_global_lru.lock); + struct sgx_epc_lru_list *lru = sgx_lru_list(page); + + spin_lock(&lru->lock); page->flags |= SGX_EPC_PAGE_RECLAIMER_TRACKED; - list_add_tail(&page->list, &sgx_global_lru.reclaimable); - spin_unlock(&sgx_global_lru.lock); + list_add_tail(&page->list, &lru->reclaimable); + spin_unlock(&lru->lock); } /** - * sgx_unmark_page_reclaimable() - Remove a page from the reclaim list + * sgx_unmark_page_reclaimable() - Remove a page from its tracking LRU * @page: EPC page * - * Clear the reclaimable flag and remove the page from the active page list. + * Clear the reclaimable flag if set and remove the page from its LRU. * * Return: * 0 on success, @@ -526,18 +530,20 @@ void sgx_mark_page_reclaimable(struct sgx_epc_page *page) */ int sgx_unmark_page_reclaimable(struct sgx_epc_page *page) { - spin_lock(&sgx_global_lru.lock); + struct sgx_epc_lru_list *lru = sgx_lru_list(page); + + spin_lock(&lru->lock); if (page->flags & SGX_EPC_PAGE_RECLAIMER_TRACKED) { /* The page is being reclaimed. */ if (list_empty(&page->list)) { - spin_unlock(&sgx_global_lru.lock); + spin_unlock(&lru->lock); return -EBUSY; } list_del(&page->list); page->flags &= ~SGX_EPC_PAGE_RECLAIMER_TRACKED; } - spin_unlock(&sgx_global_lru.lock); + spin_unlock(&lru->lock); return 0; }