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Peter Feiner 995f00a619 x86: kvm: mmu: use ept a/d in vmcs02 iff used in vmcs12 EPT A/D was enabled in the vmcs02 EPTP regardless of the vmcs12's EPTP value. The problem is that enabling A/D changes the behavior of L2's x86 page table walks as seen by L1. With A/D enabled, x86 page table walks are always treated as EPT writes. Commit `ae1e2d1082` ("kvm: nVMX: support EPT accessed/dirty bits", 2017-03-30) tried to work around this problem by clearing the write bit in the exit qualification for EPT violations triggered by page walks. However, that fixup introduced the opposite bug: page-table walks that actually set x86 A/D bits were missing the write bit in the exit qualification. This patch fixes the problem by disabling EPT A/D in the shadow MMU when EPT A/D is disabled in vmcs12's EPTP. Signed-off-by: Peter Feiner <pfeiner@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2017-07-03 15:12:44 +02:00
Documentation	kvm: x86: mmu: allow A/D bits to be disabled in an mmu	2017-07-03 11:19:54 +02:00
arch	x86: kvm: mmu: use ept a/d in vmcs02 iff used in vmcs12	2017-07-03 15:12:44 +02:00
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include	Merge branch 'kvm-ppc-next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into HEAD	2017-07-03 10:41:59 +02:00
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README

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

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.