From patchwork Fri Mar 21 12:34:40 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elena Reshetova X-Patchwork-Id: 14025358 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.11]) (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 F1572227EB9; Fri, 21 Mar 2025 12:40:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.11 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742560811; cv=none; b=BUeFx+ZaJaYDXnfS1tToQW/pcJKhU4lkBRa9jILmzCnB3dNRJ7KCZ1Ji/8DZ0yFnvgRzBgHuqv5YttZ7DoVgynZyQoMbc3CQ5YvhIGiOwtCWKCWl6odOWRDnhzwjioKm/3XIl/NSaEAY+PRv1kAzhJM+6mji+hVvU8wUajcN4gY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742560811; c=relaxed/simple; bh=IOAEwjuwvTpvoDmLfJpU5w8aRyAfTgo3wIPPZaP8nzY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ExfSukyrardUy6mqKxIox/gBBNJVvaWm+L4Drg9BIpHDcdp20gYlUVolt64e3edufUVRRwjvl8XVJm2ZFvdci6jQpVtH+glA9W5aIvSSjS9ja+3GegnHxF2QhWrmSnFgn2jHfvE1M9Kt9ubzUJhKcaJwqndCcHbbMfmnBldioDs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=cRfKZUyz; arc=none smtp.client-ip=192.198.163.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="cRfKZUyz" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1742560810; x=1774096810; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=IOAEwjuwvTpvoDmLfJpU5w8aRyAfTgo3wIPPZaP8nzY=; b=cRfKZUyznORvfV64SHBAHG2EEWXsiqta0tOrlP8Bv0cjC118c2HvEq1r dDBLdTxZAWes5m9uBM8zaslDAk5HGtYuLsjTiqTr7HWnq0txV6GpBNXZ5 CsDI72dKaia4QSBdmDWigZJVc1Pylu6ylLBq7N/eSiXKz/ozYONoremIQ gqHuH7IsHIxtGC9R3Yv/1Fuen1yGlq+Zlzbd5g6yAOK07DO7xbgeAVyRV O+o7UwR8F2aTcGiMjEk0HHTIyEN+VTEaG1s8MJsurMB9gpygkdRe5KJm5 mDYRQFuqU4m2pEdPKCsp0ScJcxLKfjZ79AouyPih+bRW4qFDAtxOgQEG8 A==; X-CSE-ConnectionGUID: IXJcEfcaQES6OSfK2Qd1uw== X-CSE-MsgGUID: 1ZEAvkM5QyG4Pf3M2CxwDA== X-IronPort-AV: E=McAfee;i="6700,10204,11380"; a="54493358" X-IronPort-AV: E=Sophos;i="6.14,264,1736841600"; d="scan'208";a="54493358" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Mar 2025 05:40:09 -0700 X-CSE-ConnectionGUID: 9MORaErLQsGFzIeODt8paA== X-CSE-MsgGUID: TIhiP0ayTJOAKcJRFWKc5w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.14,264,1736841600"; d="scan'208";a="154399906" Received: from mwiniars-desk2.ger.corp.intel.com (HELO eresheto-mobl3.ger.corp.intel.com) ([10.245.246.189]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Mar 2025 05:39:59 -0700 From: Elena Reshetova To: dave.hansen@intel.com Cc: jarkko@kernel.org, linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, asit.k.mallick@intel.com, vincent.r.scarlata@intel.com, chongc@google.com, erdemaktas@google.com, vannapurve@google.com, dionnaglaze@google.com, bondarn@google.com, scott.raynor@intel.com, Elena Reshetova Subject: [PATCH 1/4] x86/sgx: Add total number of EPC pages Date: Fri, 21 Mar 2025 14:34:40 +0200 Message-ID: <20250321123938.802763-2-elena.reshetova@intel.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20250321123938.802763-1-elena.reshetova@intel.com> References: <20250321123938.802763-1-elena.reshetova@intel.com> Precedence: bulk X-Mailing-List: linux-sgx@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In order to successfully execute ENCLS[EUPDATESVN], EPC must be empty. SGX already has a variable sgx_nr_free_pages that tracks free EPC pages. Add a new variable, sgx_nr_total_pages, that will keep track of total number of EPC pages. It will be used in subsequent patch to change the sgx_nr_free_pages into sgx_nr_used_pages and allow an easy check for an empty EPC. Note: The serialization for sgx_nr_total_pages is not needed because the variable is only updated during the initialization and there's no concurrent access. Signed-off-by: Elena Reshetova --- arch/x86/kernel/cpu/sgx/main.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index 8ce352fc72ac..d5df67dab247 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -33,6 +33,7 @@ static LIST_HEAD(sgx_active_page_list); static DEFINE_SPINLOCK(sgx_reclaimer_lock); static atomic_long_t sgx_nr_free_pages = ATOMIC_LONG_INIT(0); +static unsigned long sgx_nr_total_pages; /* Nodes with one or more EPC sections. */ static nodemask_t sgx_numa_mask; @@ -648,6 +649,8 @@ static bool __init sgx_setup_epc_section(u64 phys_addr, u64 size, list_add_tail(§ion->pages[i].list, &sgx_dirty_page_list); } + sgx_nr_total_pages += nr_pages; + return true; }