From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E4871C433EF for ; Thu, 23 Jun 2022 17:15:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229483AbiFWRPS (ORCPT ); Thu, 23 Jun 2022 13:15:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45530 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232925AbiFWRMe (ORCPT ); Thu, 23 Jun 2022 13:12:34 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 36AF918351; Thu, 23 Jun 2022 09:58:03 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0138C613F9; Thu, 23 Jun 2022 16:58:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E31F8C3411B; Thu, 23 Jun 2022 16:58:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1656003482; bh=3p0YjrfUjqKoTgC5K6srQAZQ1GXKJuj4faY5xGKBedc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Qkm97KpPIOA+5PXvupWG5R8gN4vDjiSk5sij1w6Rm0TioF3gKxfcvT9g1Ch1+uHXZ Z9AAGLG7YLksm1LrGOtBLBZlfrMGCxJpFhqtAD5T7SI4V3gtZK2ghgsaXxeHYXKR7W ivx6tFayuh0O0v1xa0zu45wb67LIuW8KJIA/hd1I= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christian Borntraeger , Janis Schoetterl-Glausch , Claudio Imbrenda , Heiko Carstens Subject: [PATCH 4.9 252/264] s390/mm: use non-quiescing sske for KVM switch to keyed guest Date: Thu, 23 Jun 2022 18:44:05 +0200 Message-Id: <20220623164351.197381495@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220623164344.053938039@linuxfoundation.org> References: <20220623164344.053938039@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christian Borntraeger commit 3ae11dbcfac906a8c3a480e98660a823130dc16a upstream. The switch to a keyed guest does not require a classic sske as the other guest CPUs are not accessing the key before the switch is complete. By using the NQ SSKE things are faster especially with multiple guests. Signed-off-by: Christian Borntraeger Suggested-by: Janis Schoetterl-Glausch Reviewed-by: Claudio Imbrenda Link: https://lore.kernel.org/r/20220530092706.11637-3-borntraeger@linux.ibm.com Signed-off-by: Christian Borntraeger Signed-off-by: Heiko Carstens Signed-off-by: Greg Kroah-Hartman --- arch/s390/mm/pgtable.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -595,7 +595,7 @@ void ptep_zap_key(struct mm_struct *mm, PGSTE_GR_BIT | PGSTE_GC_BIT); ptev = pte_val(*ptep); if (!(ptev & _PAGE_INVALID) && (ptev & _PAGE_WRITE)) - page_set_storage_key(ptev & PAGE_MASK, PAGE_DEFAULT_KEY, 1); + page_set_storage_key(ptev & PAGE_MASK, PAGE_DEFAULT_KEY, 0); pgste_set_unlock(ptep, pgste); preempt_enable(); }