linux-kernel - [PATCH 0/3] Correct monitor-mwait emulation as nop

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Message-Id: <1403101176-23664-1-git-send-email-namit@cs.technion.ac.il>
Date:	Wed, 18 Jun 2014 17:19:33 +0300
From:	Nadav Amit <namit@...technion.ac.il>
To:	pbonzini@...hat.com
Cc:	gleb@...nel.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, joro@...tes.org,
	Nadav Amit <namit@...technion.ac.il>
Subject: [PATCH 0/3] Correct monitor-mwait emulation as nop

KVM handles monitor-mwait as nop, but does not check any of the preconditions
for the instructions.  These instructions may generate all kind of exceptions
(#UD, #PF, #GP, #SS). They can also be executed in real-mode.  This patch-set
moves the handling of monitor-mwait to the emulator, to allow their execution
in either real-mode or protected-mode.  It tries to follow the SDM in checking
the preconditions and generating the necassary exceptions.

Thanks for reviewing the patch. Please try it with OS X to make sure it works
properly without generating unnecassary exception.

Nadav Amit (3):
  KVM: x86: Emulator flag for instruction with no big real mode
  KVM: x86: Emulator support for #UD on CPL>0
  KVM: x86: correct mwait and monitor emulation

 arch/x86/kvm/emulate.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++----
 arch/x86/kvm/svm.c     | 22 ++------------------
 arch/x86/kvm/vmx.c     | 27 ++++++++++---------------
 3 files changed, 64 insertions(+), 40 deletions(-)

-- 
1.9.1

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