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x86/kvm: Cache gfn to pfn translation
Boris Ostrovsky authored 
__kvm_map_gfn()'s call to gfn_to_pfn_memslot() is
* relatively expensive
* in certain cases (such as when done from atomic context) cannot be called

Stashing gfn-to-pfn mapping should help with both cases.

This is part of CVE-2019-3016.
Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: default avatarJoao Martins <joao.m.martins@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
91724814
Name Last commit Last update
Documentation Merge tag 'spi-fix-v5.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
LICENSES LICENSES: Rename other to deprecated
arch x86/kvm: Cache gfn to pfn translation
block block: fix splitting segments on boundary masks
certs certs: Add wrapper function to check blacklisted binary hash
crypto Merge tag 'tpmdd-next-20191219' of git://git.infradead.org/users/jjs/linux-tpmdd
drivers Merge tag 'tpmdd-next-20200106' of git://git.infradead.org/users/jjs/linux-tpmdd
fs ocfs2: fix the crash due to call ocfs2_get_dlm_debug once less
include x86/kvm: Cache gfn to pfn translation
init Revert "fs: remove ksys_dup()"
ipc treewide: Use sizeof_field() macro
kernel Merge tag 'trace-v5.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
lib Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
mm arm64: Revert support for execute-only user mappings
net hsr: fix slab-out-of-bounds Read in hsr_debugfs_rename()
samples samples/seccomp: Zero out members based on seccomp_notif_sizes
scripts Merge tag 'kbuild-fixes-v5.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
security Merge tag 'apparmor-pr-2020-01-04' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor
sound Merge tag 'sound-5.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
tools Merge tag 'seccomp-v5.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
usr gen_initramfs_list.sh: fix 'bad variable name' error
virt x86/kvm: Cache gfn to pfn translation
.clang-format clang-format: Update with the latest for_each macro list
.cocciconfig scripts: add Linux .cocciconfig for coccinelle
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl
.gitattributes .gitattributes: use 'dts' diff driver for dts files
.gitignore modpost: dump missing namespaces into a single modules.nsdeps file
.mailmap Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
COPYING COPYING: use the new text with points to the license files
CREDITS Merge tag 'v5.4-rc4' into docs-next
Kbuild kbuild: do not descend to ./Kbuild when cleaning
Kconfig docs: kbuild: convert docs to ReST and rename to *.rst
MAINTAINERS Merge tag 'riscv/for-v5.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
Makefile Linux 5.5-rc5
README Drop all 00-INDEX files from Documentation/
README
Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

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.