From caa49adbccffb7d50cdd8d0faf0d88647901998b Mon Sep 17 00:00:00 2001 From: Christoffer Dall Date: Thu, 21 Jan 2016 14:15:07 +0000 Subject: [PATCH] hw/arm/virt: Add always-on property to the virt board timer The virt board has an arch timer, which is always on. Emit the "always-on" property to indicate to Linux that it can switch off the periodic timer and reduces the amount of interrupts injected into a guest. Signed-off-by: Christoffer Dall Reviewed-by: Andrew Jones Message-id: 1453204158-11412-1-git-send-email-christoffer.dall@linaro.org Signed-off-by: Peter Maydell --- hw/arm/virt.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/arm/virt.c b/hw/arm/virt.c index 134f452998..15658f49c4 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -293,6 +293,7 @@ static void fdt_add_timer_nodes(const VirtBoardInfo *vbi, int gictype) qemu_fdt_setprop_string(vbi->fdt, "/timer", "compatible", "arm,armv7-timer"); } + qemu_fdt_setprop(vbi->fdt, "/timer", "always-on", NULL, 0); qemu_fdt_setprop_cells(vbi->fdt, "/timer", "interrupts", GIC_FDT_IRQ_TYPE_PPI, ARCH_TIMER_S_EL1_IRQ, irqflags, GIC_FDT_IRQ_TYPE_PPI, ARCH_TIMER_NS_EL1_IRQ, irqflags,