Messages in this thread | | | Date | Thu, 28 Apr 2016 15:56:33 -0700 | From | Greg KH <> | Subject | Re: [PATCH] 8250: Hypervisors always export working 16550A UARTs. |
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On Thu, Apr 28, 2016 at 11:18:33PM +0100, Richard W.M. Jones wrote: > Currently autoconf spends 25ms (on my laptop) testing if the UART > exported to it by KVM is an 8250 without FIFO and/or with strange > quirks, which it obviously isn't. Assume it is exported to us by a > hypervisor, it's a normal, working 16550A. > > Signed-off-by: Richard W.M. Jones <rjones@redhat.com> > --- > drivers/tty/serial/8250/8250_port.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c > index 00ad2637..de19924 100644 > --- a/drivers/tty/serial/8250/8250_port.c > +++ b/drivers/tty/serial/8250/8250_port.c > @@ -1171,6 +1171,13 @@ static void autoconfig(struct uart_8250_port *up) > if (!port->iobase && !port->mapbase && !port->membase) > return; > > + /* Hypervisors always export working 16550A devices. */ > + if (cpu_has_hypervisor) { > + up->port.type = PORT_16550A; > + up->capabilities |= UART_CAP_FIFO; > + return; > + }
Have you audited vmware, virtualbox, and everyone else that provides a virtual uart device that it will work properly here?
qemu isn't all the world :)
thanks,
greg k-h
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