All of lore.kernel.org
 help / color / mirror / Atom feed
From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, linux-arch@vger.kernel.org,
	Will Deacon <will@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	Mark Rutland <mark.rutland@arm.com>,
	Kees Cook <keescook@chromium.org>,
	Keno Fischer <keno@juliacomputing.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	kvm@vger.kernel.org
Subject: [patch V3 00/13] entry, x86, kvm: Generic entry/exit functionality for host and guest
Date: Thu, 16 Jul 2020 20:22:08 +0200	[thread overview]
Message-ID: <20200716182208.180916541@linutronix.de> (raw)

This is the 3rd version of preparing KVM to handle TIF_NOTIFY_RESUME before
exiting to guest mode.

The first attempt is available here:

    https://lore.kernel.org/r/20190801143250.370326052@linutronix.de

The second version which tried to provide generic infrastructure for KVM
can be found here:

    https://lore.kernel.org/r/20191023122705.198339581@linutronix.de

This started the whole discussion about entry code correctness which led to
the complete overhaul of the x86 entry code, non-instrumentable sections
and the other goodies which are in 5.8.

The remaining bits are rather straight forward:

  1) Move the entry/exit handling from x86 into generic code so other
     architectures can reuse the already proven to be correct code instead
     of duplicating the whole maze and creating slightly different beasts
     again.

     This utilizes the noinstr sections. The correctness of the confinement
     of non-instrumentable code can be verified with objtool on
     architectures which support it. The code code itself is clean.

  2) Provide generic work handling functionality for KVM
  
  3) Convert x86 over to use the generic entry/exit code

  4) Convert x86/KVM to use the generic work handling functionality.

#4 finally paves the way to move POSIX CPU timer heavy lifting out of
interrupt context into task work. Several hundred patches after the initial
attempt which was small and simple :)

The patches depend on:

    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/entry

The lot is also available from git:

    git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git x86/entry

The posix timer patches will be posted seperately as they are mostly
independent (except for the KVM task work detail).

The stub functions for the architecture specific parts which need to be
provided by architectures utilizing this are completely documented in the
corresponding header file which explains the diffstat.

Thanks,

	tglx

----
 arch/Kconfig                        |    3 
 arch/x86/Kconfig                    |    1 
 arch/x86/entry/common.c             |  632 ++----------------------------------
 arch/x86/entry/entry_32.S           |    2 
 arch/x86/entry/entry_64.S           |    2 
 arch/x86/include/asm/entry-common.h |  135 +++++++
 arch/x86/include/asm/idtentry.h     |   39 --
 arch/x86/include/asm/ptrace.h       |   15 
 arch/x86/include/asm/signal.h       |    1 
 arch/x86/include/asm/thread_info.h  |    5 
 arch/x86/kernel/cpu/mce/core.c      |    4 
 arch/x86/kernel/kvm.c               |    6 
 arch/x86/kernel/signal.c            |    2 
 arch/x86/kernel/traps.c             |   24 -
 arch/x86/kvm/Kconfig                |    1 
 arch/x86/kvm/vmx/vmx.c              |   11 
 arch/x86/kvm/x86.c                  |   15 
 arch/x86/mm/fault.c                 |    6 
 include/linux/entry-common.h        |  398 ++++++++++++++++++++++
 include/linux/entry-kvm.h           |   80 ++++
 include/linux/kvm_host.h            |    8 
 kernel/Makefile                     |    1 
 kernel/entry/Makefile               |    4 
 kernel/entry/common.c               |  364 ++++++++++++++++++++
 kernel/entry/kvm.c                  |   51 ++
 virt/kvm/Kconfig                    |    3 
 26 files changed, 1150 insertions(+), 663 deletions(-)

             reply	other threads:[~2020-07-16 19:50 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-16 18:22 Thomas Gleixner [this message]
2020-07-16 18:22 ` [patch V3 01/13] entry: Provide generic syscall entry functionality Thomas Gleixner
2020-07-16 20:52   ` Kees Cook
2020-07-16 21:55     ` Thomas Gleixner
2020-07-17 17:49       ` Kees Cook
2020-07-17 19:29         ` Thomas Gleixner
2020-07-17 21:56           ` Andy Lutomirski
2020-07-18 14:16             ` Thomas Gleixner
2020-07-18 14:41               ` Andy Lutomirski
2020-07-19 10:17                 ` Thomas Gleixner
2020-07-19 10:17                   ` Thomas Gleixner
2020-07-19 10:17                   ` Thomas Gleixner
2020-07-19 15:25                   ` Andy Lutomirski
2020-07-20  6:50                     ` Thomas Gleixner
2020-07-27 22:28   ` Andy Lutomirski
2020-07-16 18:22 ` [patch V3 02/13] entry: Provide generic syscall exit function Thomas Gleixner
2020-07-16 20:55   ` Kees Cook
2020-07-16 21:28     ` Thomas Gleixner
2020-07-16 18:22 ` [patch V3 03/13] entry: Provide generic interrupt entry/exit code Thomas Gleixner
2020-07-16 18:22 ` [patch V3 04/13] entry: Provide infrastructure for work before exiting to guest mode Thomas Gleixner
2020-07-16 18:22 ` [patch V3 05/13] x86/entry: Consolidate check_user_regs() Thomas Gleixner
2020-07-16 20:56   ` Kees Cook
2020-07-16 18:22 ` [patch V3 06/13] x86/entry: Consolidate 32/64 bit syscall entry Thomas Gleixner
2020-07-16 18:22 ` [patch V3 07/13] x86/ptrace: Provide pt_regs helpers for entry/exit Thomas Gleixner
2020-07-16 20:57   ` Kees Cook
2020-07-16 18:22 ` [patch V3 08/13] x86/entry: Use generic syscall entry function Thomas Gleixner
2020-07-16 21:13   ` Kees Cook
2020-07-16 21:33     ` Thomas Gleixner
2020-07-16 18:22 ` [patch V3 09/13] x86/entry: Use generic syscall exit functionality Thomas Gleixner
2020-07-16 18:22 ` [patch V3 10/13] x86/entry: Cleanup idtentry_entry/exit_user Thomas Gleixner
2020-07-16 18:22 ` [patch V3 11/13] x86/entry: Use generic interrupt entry/exit code Thomas Gleixner
2020-07-16 18:22 ` [patch V3 12/13] x86/entry: Cleanup idtentry_enter/exit Thomas Gleixner
2020-07-16 18:22 ` [patch V3 13/13] x86/kvm: Use generic exit to guest work function Thomas Gleixner

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200716182208.180916541@linutronix.de \
    --to=tglx@linutronix.de \
    --cc=arnd@arndb.de \
    --cc=keescook@chromium.org \
    --cc=keno@juliacomputing.com \
    --cc=kvm@vger.kernel.org \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mark.rutland@arm.com \
    --cc=pbonzini@redhat.com \
    --cc=will@kernel.org \
    --cc=x86@kernel.org \
    --subject='Re: [patch V3 00/13] entry, x86, kvm: Generic entry/exit functionality for host and guest' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.