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David Woodhouse ef5dd8ec88 hvc/xen: fix event channel handling for secondary consoles 
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>
2023-10-21 18:32:57 +02:00
arch console: fix up ARM screen_info reference 2023-10-17 16:34:02 +02:00
block block: Don't invalidate pagecache for invalid falloc modes 2023-10-11 15:53:17 -06:00
certs
crypto
Documentation dt-bindings: serial: rs485: Add rs485-rts-active-high 2023-10-21 18:29:20 +02:00
drivers hvc/xen: fix event channel handling for secondary consoles 2023-10-21 18:32:57 +02:00
fs overlayfs fixes for 6.6-rc6 2023-10-15 08:55:51 -07:00
include printk: Constify name for add_preferred_console() 2023-10-17 10:18:59 +02:00
init
io_uring io-wq: fully initialize wqe before calling cpuhp_state_add_instance_nocalls() 2023-10-05 14:11:18 -06:00
ipc
kernel printk: Constify name for add_preferred_console() 2023-10-17 10:18:59 +02:00
lib
LICENSES
mm Fourteen hotfixes, eleven of which are cc:stable. The remainder pertain 2023-10-01 13:33:25 -07:00
net Fixes for an overreaching WARN_ON, two error paths and a switch to 2023-10-13 11:27:31 -07:00
rust
samples
scripts kbuild: remove stale code for 'source' symlink in packaging scripts 2023-10-01 23:06:06 +09:00
security KEYS: trusted: Remove redundant static calls usage 2023-10-10 11:19:43 -07:00
sound TTY/Serial driver fixes for 6.6-rc6 2023-10-15 09:11:39 -07:00
tools RISC-V Fixes for 6.6-rc6 2023-10-13 09:17:48 -07:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap MAINTAINERS: update Matthieu's email address 2023-10-05 09:34:32 -07:00
.rustfmt.toml
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS Char/Misc driver fixes for 6.6-rc6 2023-10-15 09:07:27 -07:00
Makefile Linux 6.6-rc6 2023-10-15 13:34:39 -07:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.