[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH v2] xen/arm: allow console=hvc0 to be omitted for guests

Hi Ard,

On 12/02/2015 19:29, Ard Biesheuvel wrote:
This patch registers hvc0 as the preferred console if no console
has been specified explicitly on the kernel command line.

The purpose is to allow platform agnostic kernels and boot images
(such as distro installers) to boot in a Xen/ARM domU without the
need to modify the command line by hand.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
  arch/arm/xen/enlighten.c | 4 ++++
  1 file changed, 4 insertions(+)

diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 0abeefa7dbf8..927be1d1bad7 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -24,6 +24,7 @@
  #include <linux/cpuidle.h>
  #include <linux/cpufreq.h>
  #include <linux/cpu.h>
+#include <linux/console.h>

  #include <linux/mm.h>

@@ -255,6 +256,9 @@ void __init xen_early_init(void)
                xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
                xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
+       if (!console_set_on_cmdline && !xen_initial_domain())
+               add_preferred_console("hvc", 0, NULL);

Unfortunately, this won't work as expected.

console_set_on_cmdline is set when Linux parses the early params. The parsing is done after setup_arch (the function which call xen_early_init).

So we will end up to add the HVC console even if a console has been passed on the command line.


  static int __init xen_guest_init(void)


Julien Grall

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.