David Woodhouse 1a2c7a2f35 hvc/xen: fix event channel handling for secondary consoles ... commit ef5dd8ec88 upstream. 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=con1,chardev=pty0 [ 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 — the toolstack allocates the guest event channel and the guest discovers it with HVMOP_get_param. Fixes: fe415186b4 ("xen/console: harden hvc_xen against event channel storms") Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Juergen Gross <jgross@suse.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20231020161529.355083-2-dwmw2@infradead.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-11-28 17:07:08 +00:00
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hvc_console.c
hvc_console.h
hvc_dcc.c
hvc_irq.c
hvc_iucv.c
hvc_opal.c
hvc_riscv_sbi.c
hvc_rtas.c
hvc_udbg.c
hvc_vio.c
hvc_xen.c	hvc/xen: fix event channel handling for secondary consoles	2023-11-28 17:07:08 +00:00
hvcs.c
hvsi.c
hvsi_lib.c
Kconfig
Makefile