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

Re: [Xen-devel] [PATCH v2 2/3] hvc_xen: fix xenboot for DomUs



On 02/25/2016 07:10 AM, Stefano Stabellini wrote:
The xenboot early console has been partially broken for DomU for a long
time: the output would only go to the hypervisor via hypercall
(HYPERVISOR_console_io), while it wouldn't actually go to the DomU
console. The reason is that domU_write_console would return early as no
xencons structs are configured for it.

Add an appropriate xencons struct for xenboot from the xenboot setup
callback.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

---
Changes in v2:
- add return to xenboot_setup_console
---
  drivers/tty/hvc/hvc_xen.c |   32 ++++++++++++++++++++++++++------
  1 file changed, 26 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c
index 68b8ec8..bf787aa 100644
--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -246,6 +246,18 @@ err:
        return -ENODEV;
  }
+static int xen_early_pv_console_init(struct xencons_info *info, int vtermno)

Nit: not sure whether "early" is the right word to use here: when called from xen_pv_console_init() it's not really on the early path.

Other than that:
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>

+{
+       info->evtchn = xen_start_info->console.domU.evtchn;
+       /* GFN == MFN for PV guest */
+       info->intf = gfn_to_virt(xen_start_info->console.domU.mfn);
+       info->vtermno = vtermno;
+
+       list_add_tail(&info->list, &xenconsoles);
+
+       return 0;
+}
+
  static int xen_pv_console_init(void)
  {
        struct xencons_info *info;
@@ -265,13 +277,8 @@ static int xen_pv_console_init(void)
                /* already configured */
                return 0;
        }
-       info->evtchn = xen_start_info->console.domU.evtchn;
-       /* GFN == MFN for PV guest */
-       info->intf = gfn_to_virt(xen_start_info->console.domU.mfn);
-       info->vtermno = HVC_COOKIE;
-
        spin_lock(&xencons_lock);
-       list_add_tail(&info->list, &xenconsoles);
+       xen_early_pv_console_init(info, HVC_COOKIE);
        spin_unlock(&xencons_lock);
return 0;
@@ -599,6 +606,18 @@ static int xen_cons_init(void)
  console_initcall(xen_cons_init);
#ifdef CONFIG_EARLY_PRINTK
+static int __init xenboot_setup_console(struct console *console, char *string)
+{
+       static struct xencons_info xenboot;
+
+       if (xen_initial_domain())
+               return 0;
+       if (!xen_pv_domain())
+               return -ENODEV;
+
+       return xen_early_pv_console_init(&xenboot, 0);
+}
+
  static void xenboot_write_console(struct console *console, const char *string,
                                  unsigned len)
  {
@@ -629,6 +648,7 @@ static void xenboot_write_console(struct console *console, 
const char *string,
  struct console xenboot_console = {
        .name           = "xenboot",
        .write          = xenboot_write_console,
+       .setup          = xenboot_setup_console,
        .flags          = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
        .index          = -1,
  };


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel

 


Rackspace

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