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Filename Latest commit message Latest commit date
Sean Christopherson 58e1e7514f KVM: x86: Ensure guest's FPU state is loaded when accessing for emulation 
commit a7baead7e312f5a05381d68585fb6dc68e19e90f upstream.

Lock the FPU regs and reload the current thread's FPU state, which holds
the guest's FPU state, to the CPU registers if necessary prior to
accessing guest FPU state as part of emulation.  kernel_fpu_begin() can
be called from softirq context, therefore KVM must ensure softirqs are
disabled (locking the FPU regs disables softirqs) when touching CPU FPU
state.

Note, for all intents and purposes this reverts commit 6ab0b9feb8
("x86,kvm: remove KVM emulator get_fpu / put_fpu"), but at the time it
was applied, removing get/put_fpu() was correct.  The re-introduction
of {get,put}_fpu() is necessitated by the deferring of FPU state load.

Fixes: 5f409e20b7 ("x86/fpu: Defer FPU state load until return to userspace")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-02-11 04:35:41 -08:00
arch KVM: x86: Ensure guest's FPU state is loaded when accessing for emulation 2020-02-11 04:35:41 -08:00
block
certs
crypto crypto: api - Fix race condition in crypto_spawn_alg 2020-02-11 04:35:31 -08:00
Documentation PM / devfreq: Add new name attribute for sysfs 2020-02-05 21:22:40 +00:00
drivers bcache: add readahead cache policy options via sysfs interface 2020-02-11 04:35:37 -08:00
fs aio: prevent potential eventfd recursion on poll 2020-02-11 04:35:37 -08:00
include x86/kvm: Cache gfn to pfn translation 2020-02-11 04:35:40 -08:00
init Revert "um: Enable CONFIG_CONSTRUCTORS" 2020-02-01 09:34:53 +00:00
ipc ipc/msg.c: consolidate all xxxctl_down() functions 2020-02-11 04:35:07 -08:00
kernel bpf, devmap: Pass lockdep expression to RCU lists 2020-02-11 04:35:29 -08:00
lib lib/test_kasan.c: fix memory leak in kmalloc_oob_krealloc_more() 2020-02-11 04:35:14 -08:00
LICENSES
mm mm: move_pages: report the number of non-attempted pages 2020-02-11 04:35:13 -08:00
net sunrpc: expiry_time should be seconds not timeval 2020-02-11 04:35:35 -08:00
samples samples/bpf: Xdp_redirect_cpu fix missing tracepoint attach 2020-02-11 04:35:29 -08:00
scripts scripts/find-unused-docs: Fix massive false positives 2020-02-11 04:35:23 -08:00
security tomoyo: Use atomic_t for statistics counter 2020-02-05 21:22:41 +00:00
sound ASoC: SOF: core: release resources on errors in probe_continue 2020-02-11 04:35:27 -08:00
tools tools/kvm_stat: Fix kvm_exit filter name 2020-02-11 04:35:36 -08:00
usr
virt x86/kvm: Cache gfn to pfn translation 2020-02-11 04:35:40 -08:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS MAINTAINERS: correct entries for ISDN/mISDN section 2020-02-11 04:35:06 -08:00
Makefile Linux 5.4.18 2020-02-05 21:22:53 +00:00
README

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.