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See http://www.infradead.org/rpr.html X-ZohoMail-DKIM: pass (identity @infradead.org) X-ZM-MESSAGEID: 1697818573164100003 From: David Woodhouse The xencons_connect_backend() function allocates a local interdomain event channel with xenbus_alloc_evtchn(), then calls bind_interdomain_evtchn_to_irq_lateeoi() to bind to that port# on the *remote* domain. That doesn't work very well: (qemu) device_add xen-console,id=3Dcon1,chardev=3Dpty0 [ 44.323872] xenconsole console-1: 2 xenbus_dev_probe on device/console/1 [ 44.323995] xenconsole: probe of console-1 failed with error -2 Fix it to use bind_evtchn_to_irq_lateeoi(), which does the right thing by just binding that *local* event channel to an irq. The backend will do the interdomain binding. This didn't affect the primary console because the setup for that is special =E2=80=94 the toolstack allocates the guest event channel and the g= uest discovers it with HVMOP_get_param. Fixes: fe415186b4 ("xen/console: harden hvc_xen against event channel storm= s") Signed-off-by: David Woodhouse Reviewed-by: Juergen Gross Cc: stable@vger.kernel.org --- drivers/tty/hvc/hvc_xen.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c index 98764e740c07..f24e285b6441 100644 --- a/drivers/tty/hvc/hvc_xen.c +++ b/drivers/tty/hvc/hvc_xen.c @@ -433,7 +433,7 @@ static int xencons_connect_backend(struct xenbus_device= *dev, if (ret) return ret; info->evtchn =3D evtchn; - irq =3D bind_interdomain_evtchn_to_irq_lateeoi(dev, evtchn); + irq =3D bind_evtchn_to_irq_lateeoi(evtchn); if (irq < 0) return irq; info->irq =3D irq; --=20 2.40.1