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 <christoffer.d...@linaro.org> --- hw/arm/virt.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/arm/virt.c b/hw/arm/virt.c index 05f9087..265fe9a 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -291,6 +291,7 @@ 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, -- 2.1.2.330.g565301e.dirty