From patchwork Mon Mar 20 06:49:03 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Herrenschmidt X-Patchwork-Id: 740807 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3vmmlk41FCz9s2s for ; Mon, 20 Mar 2017 17:49:54 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751556AbdCTGtx (ORCPT ); Mon, 20 Mar 2017 02:49:53 -0400 Received: from gate.crashing.org ([63.228.1.57]:41649 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753036AbdCTGtv (ORCPT ); Mon, 20 Mar 2017 02:49:51 -0400 Received: from pasglop.au.ibm.com (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.13.8) with ESMTP id v2K6nQUn025488; Mon, 20 Mar 2017 01:49:27 -0500 From: Benjamin Herrenschmidt To: linuxppc-dev@ozlabs.org, kvm-ppc@vger.kernel.org Cc: Benjamin Herrenschmidt Subject: [PATCH 01/12] powerpc: Disable HFSCR:TM if TM not supported Date: Mon, 20 Mar 2017 17:49:03 +1100 Message-Id: <20170320064914.4437-1-benh@kernel.crashing.org> X-Mailer: git-send-email 2.9.3 Sender: kvm-ppc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org Otherwise KVM guests might mess with it even when told not to causing bad thing interrupts in the host Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/setup_64.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 9cfaa8b..b372b23 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -236,6 +236,16 @@ static void cpu_ready_for_interrupts(void) mtspr(SPRN_LPCR, lpcr | LPCR_AIL_3); } + /* + * Fixup HFSCR:TM based on CPU features. The bit is set by our + * early asm init because at that point we haven't updated our + * CPU features from firmware and device-tree. Here we have, + * so let's do it + */ + if (early_cpu_has_feature(CPU_FTR_HVMODE) && + !early_cpu_has_feature(CPU_FTR_TM_COMP)) + mtspr(SPRN_HFSCR, mfspr(SPRN_HFSCR) & ~HFSCR_TM); + /* Set IR and DR in PACA MSR */ get_paca()->kernel_msr = MSR_KERNEL; }