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Filename Latest commit message Latest commit date
Brijesh Singh 64531a3b70 KVM: SVM: Limit PFERR_NESTED_GUEST_PAGE error_code check to L1 guest 
Commit 147277540b ("kvm: svm: Add support for additional SVM NPF error
codes", 2016-11-23) added a new error code to aid nested page fault
handling.  The commit unprotects (kvm_mmu_unprotect_page) the page when
we get a NPF due to guest page table walk where the page was marked RO.

However, if an L0->L2 shadow nested page table can also be marked read-only
when a page is read only in L1's nested page table.  If such a page
is accessed by L2 while walking page tables it can cause a nested
page fault (page table walks are write accesses).  However, after
kvm_mmu_unprotect_page we may get another page fault, and again in an
endless stream.

To cover this use case, we qualify the new error_code check with
vcpu->arch.mmu_direct_map so that the error_code check would run on L1
guest, and not the L2 guest.  This avoids hitting the above scenario.

Fixes: 147277540b
Cc: stable@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Thomas Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-08-10 16:44:04 +02:00
arch KVM: SVM: Limit PFERR_NESTED_GUEST_PAGE error_code check to L1 guest 2017-08-10 16:44:04 +02:00
block
certs
crypto
Documentation media fixes for v4.13-rc2 2017-08-05 14:09:26 -07:00
drivers platform-drivers-x86 for v4.13-4 2017-08-06 16:11:34 -07:00
firmware
fs A large number of ext4 bug fixes and cleanups for v4.13 2017-08-06 12:31:17 -07:00
include KVM: add spinlock optimization framework 2017-08-08 10:57:43 +02:00
init
ipc ipc: add missing container_of()s for randstruct 2017-08-02 17:16:12 -07:00
kernel Fix compat_sys_sigpending breakage 2017-08-06 11:48:27 -07:00
lib Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-07-31 22:36:42 -07:00
mm mm: take memory hotplug lock within numa_zonelist_order_handler() 2017-08-02 17:16:11 -07:00
net A bunch of fixes and follow-ups for -rc1 Luminous patches: issues with 2017-08-04 10:15:11 -07:00
samples samples/bpf: fix bpf tunnel cleanup 2017-07-31 22:02:47 -07:00
scripts DeviceTree fixes for 4.13: 2017-07-28 17:21:41 -07:00
security
sound ASoC: Fixes for v4.13 2017-08-02 17:11:45 +02:00
tools Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-07-31 22:36:42 -07:00
usr
virt KVM: arm: implements the kvm_arch_vcpu_in_kernel() 2017-08-08 10:57:43 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS GPIO fixes in the first take after v4.13-rc1: 2017-08-05 06:55:13 -07:00
Makefile Linux 4.13-rc4 2017-08-06 18:44:49 -07:00
README

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.