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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>
This commit is contained in:
Stefano Stabellini 2016-02-25 12:10:38 +00:00
parent 16e506efc0
commit 5de738b3fb
1 changed files with 26 additions and 6 deletions
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32
drivers/tty/hvc/hvc_xen.c
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@ -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,
};