From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoffer Dall Subject: [PATCH 1/5] ARM: arch_timers: switch to physical timers if HYP mode is available Date: Sat, 15 Sep 2012 11:39:02 -0400 Message-ID: <20120915153902.21673.37552.stgit@ubuntu> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit To: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu Return-path: Received: from mail-qc0-f174.google.com ([209.85.216.174]:39118 "EHLO mail-qc0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754458Ab2IOPjD (ORCPT ); Sat, 15 Sep 2012 11:39:03 -0400 Received: by mail-qc0-f174.google.com with SMTP id o28so3527231qcr.19 for ; Sat, 15 Sep 2012 08:39:03 -0700 (PDT) Sender: kvm-owner@vger.kernel.org List-ID: From: Marc Zyngier If we're booted in HYP mode, it is possible that we'll run some kind of virtualized environment. In this case, it is a better to switch to the physical timers, and leave the virtual timers to guests. Signed-off-by: Marc Zyngier --- arch/arm/kernel/arch_timer.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm/kernel/arch_timer.c b/arch/arm/kernel/arch_timer.c index c04c2a6..8a30186 100644 --- a/arch/arm/kernel/arch_timer.c +++ b/arch/arm/kernel/arch_timer.c @@ -25,6 +25,7 @@ #include #include #include +#include static unsigned long arch_timer_rate; @@ -490,10 +491,14 @@ int __init arch_timer_of_register(void) arch_timer_ppi[i] = irq_of_parse_and_map(np, i); /* + * If HYP mode is available, we know that the physical timer + * has been configured to be accessible from PL1. Use it, so + * that a guest can use the virtual timer instead. + * * If no interrupt provided for virtual timer, we'll have to * stick to the physical timer. It'd better be accessible... */ - if (!arch_timer_ppi[VIRT_PPI]) { + if (is_hyp_mode_available() || !arch_timer_ppi[VIRT_PPI]) { arch_timer_use_virtual = false; if (!arch_timer_ppi[PHYS_SECURE_PPI] ||