WSL2-Linux-Kernel/drivers/lguest
Davide Libenzi 133890103b eventfd: revised interface and cleanups
Change the eventfd interface to de-couple the eventfd memory context, from
the file pointer instance.

Without such change, there is no clean way to racely free handle the
POLLHUP event sent when the last instance of the file* goes away.  Also,
now the internal eventfd APIs are using the eventfd context instead of the
file*.

This patch is required by KVM's IRQfd code, which is still under
development.

Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Cc: Gregory Haskins <ghaskins@novell.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Avi Kivity <avi@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-30 18:55:58 -07:00
..
x86 lguest: fix on Intel when KVM loaded (unhandled trap 13) 2009-05-26 12:13:11 -07:00
Kconfig lguest: use eventfds for device notification 2009-06-12 22:27:10 +09:30
Makefile lguest: Add puppies which where previously missing. 2008-03-28 11:05:52 +11:00
README lguest: documentation I: Preparation 2007-07-26 11:35:16 -07:00
core.c lguest: remove obsolete LHREQ_BREAK call 2009-06-12 22:27:11 +09:30
hypercalls.c lguest: PAE support 2009-06-12 22:27:08 +09:30
interrupts_and_traps.c lguest: allow any process to send interrupts 2009-06-12 22:27:09 +09:30
lg.h eventfd: revised interface and cleanups 2009-06-30 18:55:58 -07:00
lguest_device.c virtio: find_vqs/del_vqs virtio operations 2009-06-12 22:16:36 +09:30
lguest_user.c eventfd: revised interface and cleanups 2009-06-30 18:55:58 -07:00
page_tables.c lguest: PAE fixes 2009-06-12 22:27:08 +09:30
segments.c lguest: beyond ARRAY_SIZE of cpu->arch.gdt 2009-06-12 22:27:04 +09:30

README

Welcome, friend reader, to lguest.

Lguest is an adventure, with you, the reader, as Hero.  I can't think of many
5000-line projects which offer both such capability and glimpses of future
potential; it is an exciting time to be delving into the source!

But be warned; this is an arduous journey of several hours or more!  And as we
know, all true Heroes are driven by a Noble Goal.  Thus I offer a Beer (or
equivalent) to anyone I meet who has completed this documentation.

So get comfortable and keep your wits about you (both quick and humorous).
Along your way to the Noble Goal, you will also gain masterly insight into
lguest, and hypervisors and x86 virtualization in general.

Our Quest is in seven parts: (best read with C highlighting turned on)

I) Preparation
	- In which our potential hero is flown quickly over the landscape for a
	  taste of its scope.  Suitable for the armchair coders and other such
	  persons of faint constitution.

II) Guest
	- Where we encounter the first tantalising wisps of code, and come to
	  understand the details of the life of a Guest kernel.

III) Drivers
	- Whereby the Guest finds its voice and become useful, and our
	  understanding of the Guest is completed.

IV) Launcher
	- Where we trace back to the creation of the Guest, and thus begin our
	  understanding of the Host.

V) Host
	- Where we master the Host code, through a long and tortuous journey.
	  Indeed, it is here that our hero is tested in the Bit of Despair.

VI) Switcher
	- Where our understanding of the intertwined nature of Guests and Hosts
	  is completed.

VII) Mastery
	- Where our fully fledged hero grapples with the Great Question:
	  "What next?"

make Preparation!
Rusty Russell.