From patchwork Fri Sep 21 10:01:44 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Mackerras X-Patchwork-Id: 10609593 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 84B3E112B for ; Fri, 21 Sep 2018 10:02:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 753F62D876 for ; Fri, 21 Sep 2018 10:02:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 69BA32D888; Fri, 21 Sep 2018 10:02:28 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9076D2D876 for ; Fri, 21 Sep 2018 10:02:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389666AbeIUPud (ORCPT ); Fri, 21 Sep 2018 11:50:33 -0400 Received: from ozlabs.org ([203.11.71.1]:55967 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389630AbeIUPuc (ORCPT ); Fri, 21 Sep 2018 11:50:32 -0400 Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPSA id 42Gpzz3wtmz9sDP; Fri, 21 Sep 2018 20:02:23 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=ozlabs.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ozlabs.org; s=201707; t=1537524143; bh=nXSfhP0hQ7x3YyWojFL1Kk6BGDTJvOwHG8PDXAKvQWQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D+HMA3uj1FwCDEVlqcer8D6KvKLOe/EJJznFhHdijFJvCLHB/zbEpRopOfm+Y6UOc whqxLjh1g9dvgwSFzaXAZc2fY/NojsNjatFBqccz8mJ+yvbbY4Is5LW9IqEhSeh65V QvKtfR2kaVsDDjaBP31+ZYVkM9XSCjJOHJTp7+nvhzZOfDvx8hGR7lgedELcM/OCR+ 5btt9eWzSPRuBTssLHU0Rl8XPtYUlN6uG14ziwN8JBhF24FZMnsMAByzGp+EF0tJSK /pY534+5fbK20ovGVlifDr/g4E8cDkvVrEqWwVlZmIxdrzvuMI8D+Oyvo9b+rJBcsQ Nx3iwlG8LIYdQ== From: Paul Mackerras To: kvm-ppc@vger.kernel.org, kvm@vger.kernel.org Cc: David Gibson Subject: [RFC PATCH 13/32] powerpc: Turn off CPU_FTR_P9_TM_HV_ASSIST in non-hypervisor mode Date: Fri, 21 Sep 2018 20:01:44 +1000 Message-Id: <1537524123-9578-14-git-send-email-paulus@ozlabs.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1537524123-9578-1-git-send-email-paulus@ozlabs.org> References: <1537524123-9578-1-git-send-email-paulus@ozlabs.org> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When doing nested virtualization, it is only necessary to do the transactional memory hypervisor assist at level 0, that is, when we are in hypervisor mode. Nested hypervisors can just use the TM facilities as architected. Therefore we should clear the CPU_FTR_P9_TM_HV_ASSIST bit when we are not in hypervisor mode, along with the CPU_FTR_HVMODE bit. Doing this will not change anything at this stage because the only code that tests CPU_FTR_P9_TM_HV_ASSIST is in HV KVM, which currently can only be used when when CPU_FTR_HVMODE is set. Signed-off-by: Paul Mackerras Reviewed-by: David Gibson --- arch/powerpc/kernel/cpu_setup_power.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kernel/cpu_setup_power.S b/arch/powerpc/kernel/cpu_setup_power.S index 458b928..c317080 100644 --- a/arch/powerpc/kernel/cpu_setup_power.S +++ b/arch/powerpc/kernel/cpu_setup_power.S @@ -147,8 +147,8 @@ __init_hvmode_206: rldicl. r0,r3,4,63 bnelr ld r5,CPU_SPEC_FEATURES(r4) - LOAD_REG_IMMEDIATE(r6,CPU_FTR_HVMODE) - xor r5,r5,r6 + LOAD_REG_IMMEDIATE(r6,CPU_FTR_HVMODE | CPU_FTR_P9_TM_HV_ASSIST) + andc r5,r5,r6 std r5,CPU_SPEC_FEATURES(r4) blr