From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751773AbbD3MTZ (ORCPT ); Thu, 30 Apr 2015 08:19:25 -0400 Received: from ip4-83-240-67-251.cust.nbox.cz ([83.240.67.251]:53661 "EHLO ip4-83-240-18-248.cust.nbox.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751429AbbD3MMe (ORCPT ); Thu, 30 Apr 2015 08:12:34 -0400 From: Jiri Slaby To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Pranavkumar Sawargaonkar , Anup Patel , Christoffer Dall , Shannon Zhao , Jiri Slaby Subject: [PATCH 3.12 44/63] ARM/ARM64: KVM: Nuke Hyp-mode tlbs before enabling MMU Date: Thu, 30 Apr 2015 14:12:13 +0200 Message-Id: <186a6d9a4eb0ceaac063ee6744840701d03033af.1430387326.git.jslaby@suse.cz> X-Mailer: git-send-email 2.3.5 In-Reply-To: <45aaf85687dd6ac119c55c5ec0dbe0bef0e62235.1430387326.git.jslaby@suse.cz> References: <45aaf85687dd6ac119c55c5ec0dbe0bef0e62235.1430387326.git.jslaby@suse.cz> In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pranavkumar Sawargaonkar 3.12-stable review patch. If anyone has any objections, please let me know. =============== commit f6edbbf36da3a27b298b66c7955fc84e1dcca305 upstream. X-Gene u-boot runs in EL2 mode with MMU enabled hence we might have stale EL2 tlb enteris when we enable EL2 MMU on each host CPU. This can happen on any ARM/ARM64 board running bootloader in Hyp-mode (or EL2-mode) with MMU enabled. This patch ensures that we flush all Hyp-mode (or EL2-mode) TLBs on each host CPU before enabling Hyp-mode (or EL2-mode) MMU. Cc: Tested-by: Mark Rutland Reviewed-by: Marc Zyngier Signed-off-by: Pranavkumar Sawargaonkar Signed-off-by: Anup Patel Signed-off-by: Christoffer Dall Signed-off-by: Shannon Zhao Signed-off-by: Jiri Slaby --- arch/arm/kvm/init.S | 4 ++++ arch/arm64/kvm/hyp-init.S | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/arch/arm/kvm/init.S b/arch/arm/kvm/init.S index 1b9844d369cc..ee4f7447a1d3 100644 --- a/arch/arm/kvm/init.S +++ b/arch/arm/kvm/init.S @@ -98,6 +98,10 @@ __do_hyp_init: mrc p15, 0, r0, c10, c2, 1 mcr p15, 4, r0, c10, c2, 1 + @ Invalidate the stale TLBs from Bootloader + mcr p15, 4, r0, c8, c7, 0 @ TLBIALLH + dsb ish + @ Set the HSCTLR to: @ - ARM/THUMB exceptions: Kernel config (Thumb-2 kernel) @ - Endianness: Kernel config diff --git a/arch/arm64/kvm/hyp-init.S b/arch/arm64/kvm/hyp-init.S index ba84e6705e20..e9c87e5402c7 100644 --- a/arch/arm64/kvm/hyp-init.S +++ b/arch/arm64/kvm/hyp-init.S @@ -74,6 +74,10 @@ __do_hyp_init: msr mair_el2, x4 isb + /* Invalidate the stale TLBs from Bootloader */ + tlbi alle2 + dsb sy + mov x4, #SCTLR_EL2_FLAGS msr sctlr_el2, x4 isb -- 2.3.5