From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753963AbdGSJqL (ORCPT ); Wed, 19 Jul 2017 05:46:11 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:37474 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753365AbdGSJqH (ORCPT ); Wed, 19 Jul 2017 05:46:07 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hu Huajun , Christoffer Dall , Marc Zyngier Subject: [PATCH 4.12 33/84] KVM: ARM64: fix phy counter access failure in guest. Date: Wed, 19 Jul 2017 11:43:39 +0200 Message-Id: <20170719092323.664136405@linuxfoundation.org> X-Mailer: git-send-email 2.13.3 In-Reply-To: <20170719092322.362625377@linuxfoundation.org> References: <20170719092322.362625377@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Hu Huajun commit 02d50cdaff36c135d222015cffdca3ff11d168ea upstream. When reading the cntpct_el0 in guest with VHE (Virtual Host Extension) enabled in host, the "Unsupported guest sys_reg access" error reported. The reason is cnthctl_el2.EL1PCTEN is not enabled, which is expected to be done in kvm_timer_init_vhe(). The problem is kvm_timer_init_vhe is called by cpu_init_hyp_mode, and which is called when VHE is disabled. This patch remove the incorrect call to kvm_timer_init_vhe() from cpu_init_hyp_mode(), and calls kvm_timer_init_vhe() to enable cnthctl_el2.EL1PCTEN in cpu_hyp_reinit(). Fixes: 488f94d7212b ("KVM: arm64: Access CNTHCTL_EL2 bit fields correctly on VHE systems") Signed-off-by: Hu Huajun Reviewed-by: Christoffer Dall Acked-by: Marc Zyngier Signed-off-by: Christoffer Dall Signed-off-by: Greg Kroah-Hartman --- virt/kvm/arm/arm.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -1115,9 +1115,6 @@ static void cpu_init_hyp_mode(void *dumm __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr); __cpu_init_stage2(); - if (is_kernel_in_hyp_mode()) - kvm_timer_init_vhe(); - kvm_arm_init_debug(); } @@ -1137,6 +1134,7 @@ static void cpu_hyp_reinit(void) * event was cancelled before the CPU was reset. */ __cpu_init_stage2(); + kvm_timer_init_vhe(); } else { cpu_init_hyp_mode(NULL); }