From mboxrd@z Thu Jan 1 00:00:00 1970 From: c.dall@virtualopensystems.com (Christoffer Dall) Date: Tue, 08 Jan 2013 13:43:13 -0500 Subject: [PATCH v5 1/4] ARM: arch_timers: switch to physical timers if HYP mode is available In-Reply-To: <20130108184259.46758.17939.stgit@ubuntu> References: <20130108184259.46758.17939.stgit@ubuntu> Message-ID: <20130108184313.46758.23099.stgit@ubuntu> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 c8ef207..8adcd04 100644 --- a/arch/arm/kernel/arch_timer.c +++ b/arch/arm/kernel/arch_timer.c @@ -26,6 +26,7 @@ #include #include #include +#include static unsigned long arch_timer_rate; @@ -489,10 +490,14 @@ 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] ||