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 C0534C43334 for ; Thu, 23 Jun 2022 18:22:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237147AbiFWSWA (ORCPT ); Thu, 23 Jun 2022 14:22:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41912 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236897AbiFWSQ6 (ORCPT ); Thu, 23 Jun 2022 14:16:58 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E8FFB62C29; Thu, 23 Jun 2022 10:23:37 -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 6D2C761DC6; Thu, 23 Jun 2022 17:23:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 351F6C3411B; Thu, 23 Jun 2022 17:23:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1656005016; bh=GJjPzaE1Xp4leBAxjdOS0+AqdSMbVLMu+pd/8Sgp3ck=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TwcNGpidp4w4VcROdnABMofXAr7rtFBMWYXBJUBBdAykYwgTnw7maWjkEAA6jqWln +YdonRTDnx89UVct0AvEdqjXIaaoIwlzZZoZDpZpSWuhZvZMQvtbPMOxCTdZJtLV1S V9dhGnGrBwdUZodp0ztsnQsN3j0Ih2oQwIWTi35M= 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 4.19 225/234] s390/mm: use non-quiescing sske for KVM switch to keyed guest Date: Thu, 23 Jun 2022 18:44:52 +0200 Message-Id: <20220623164349.416773391@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220623164343.042598055@linuxfoundation.org> References: <20220623164343.042598055@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 @@ -716,7 +716,7 @@ void ptep_zap_key(struct mm_struct *mm, pgste_val(pgste) |= 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(); }