Both the 16550/8250 UART emulation in kvmtool as well as all the drivers and DTBs for real hardware use level triggered interrupts. But the device tree currently describes them as being edge triggered, which can lead to hangs in guests. Use the new IRQ type parameter to properly describe the interrupts. This goes along the lines of a similar QEMU patch: http://git.qemu.org/?p=qemu.git;a=commitdiff;h=0be969a2d974971628fc4ed95834d22ecf0fd497 Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx> --- tools/kvm/hw/serial.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/kvm/hw/serial.c b/tools/kvm/hw/serial.c index 266863b..f223802 100644 --- a/tools/kvm/hw/serial.c +++ b/tools/kvm/hw/serial.c @@ -385,7 +385,7 @@ static void serial8250_generate_fdt_node(struct ioport *ioport, void *fdt, _FDT(fdt_begin_node(fdt, dev_name)); _FDT(fdt_property_string(fdt, "compatible", "ns16550a")); _FDT(fdt_property(fdt, "reg", reg_prop, sizeof(reg_prop))); - generate_irq_prop(fdt, dev->irq, GIC_FDT_IRQ_FLAGS_EDGE_LO_HI); + generate_irq_prop(fdt, dev->irq, GIC_FDT_IRQ_FLAGS_LEVEL_HI); _FDT(fdt_property_cell(fdt, "clock-frequency", 1843200)); _FDT(fdt_end_node(fdt)); } -- 1.7.9.5 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
