diff options
| author | Stefano Stabellini <sstabellini@kernel.org> | 2026-01-13 15:24:20 -0800 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2026-01-14 14:43:57 +0100 |
| commit | 763baca7bf8b36b8ff0e1ec6eb30dbfe99b18fd8 (patch) | |
| tree | 6e528f8967dd9e941cb13ea3b22bc601718d667f /drivers | |
| parent | dc8ea8714311e549ee93a2b0bdd5487d20bfadbf (diff) | |
xen: introduce xen_console_io option
Xen can support console_io hypercalls for any domains, not just dom0,
depending on DEBUG and XSM policies. These hypercalls can be very useful
for development and debugging.
Introduce a kernel command line option xen_console_io to enable the
usage of console_io hypercalls for any domain upon request. When
xen_console_io is not specified, the current behavior is retained.
Signed-off-by: Stefano Stabellini <stefano.stabellini@amd.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-ID: <alpine.DEB.2.22.394.2601131522540.992863@ubuntu-linux-20-04-desktop>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/hvc/hvc_xen.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c index 388a71afd6ef..95ec01b1aacf 100644 --- a/drivers/tty/hvc/hvc_xen.c +++ b/drivers/tty/hvc/hvc_xen.c @@ -51,6 +51,22 @@ static DEFINE_SPINLOCK(xencons_lock); /* ------------------------------------------------------------------ */ +static bool xen_console_io = false; +static int __initdata opt_console_io = -1; + +static int __init parse_xen_console_io(char *arg) +{ + bool val; + int ret; + + ret = kstrtobool(arg, &val); + if (ret == 0) + opt_console_io = (int)val; + + return ret; +} +early_param("xen_console_io", parse_xen_console_io); + static struct xencons_info *vtermno_to_xencons(int vtermno) { struct xencons_info *entry, *ret = NULL; @@ -331,7 +347,7 @@ static int xen_initial_domain_console_init(void) struct xencons_info *info; unsigned long flags; - if (!xen_initial_domain()) + if (!xen_console_io) return -ENODEV; info = vtermno_to_xencons(HVC_COOKIE); @@ -369,7 +385,7 @@ void xen_console_resume(void) { struct xencons_info *info = vtermno_to_xencons(HVC_COOKIE); if (info != NULL && info->irq) { - if (!xen_initial_domain()) + if (!xen_console_io) xen_console_update_evtchn(info); rebind_evtchn_irq(info->evtchn, info->irq); } @@ -601,7 +617,7 @@ static int __init xen_hvc_init(void) if (!xen_domain()) return -ENODEV; - if (xen_initial_domain()) { + if (xen_console_io) { ops = &dom0_hvc_ops; r = xen_initial_domain_console_init(); if (r < 0) @@ -647,14 +663,17 @@ static int __init xen_hvc_init(void) } device_initcall(xen_hvc_init); -static int xen_cons_init(void) +static int __init xen_cons_init(void) { const struct hv_ops *ops; + xen_console_io = opt_console_io >= 0 ? opt_console_io : + xen_initial_domain(); + if (!xen_domain()) return 0; - if (xen_initial_domain()) + if (xen_console_io) ops = &dom0_hvc_ops; else { int r; |