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authorStefano Stabellini <stefano.stabellini@eu.citrix.com>2016-02-25 12:10:38 +0000
committerStefano Stabellini <stefano.stabellini@eu.citrix.com>2016-02-26 16:51:08 +0000
commit5de738b3fbbd52a21850d5c1b6c1e5823db18b21 (patch)
tree863e721a59393476be1a21909db8e6ccb3e0c95c /drivers/tty/hvc
parent16e506efc08e5cab313588bd0e38803d4bbaad59 (diff)
downloadlinux-5de738b3fbbd52a21850d5c1b6c1e5823db18b21.tar.bz2
hvc_xen: fix xenboot for DomUs
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@eu.citrix.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers/tty/hvc')
-rw-r--r--drivers/tty/hvc/hvc_xen.c32
1 files changed, 26 insertions, 6 deletions
diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c
index 68b8ec886bec..f34dec1d588a 100644
--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -246,6 +246,18 @@ err:
return -ENODEV;
}
+static int xencons_info_pv_init(struct xencons_info *info, int vtermno)
+{
+ 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);
+ xencons_info_pv_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 xencons_info_pv_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,
};