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Filename Latest commit message Latest commit date
Jim Mattson 3c6e099fa1 KVM: nVMX: Always reflect #NM VM-exits to L1 
When bit 3 (corresponding to CR0.TS) of the VMCS12 cr0_guest_host_mask
field is clear, the VMCS12 guest_cr0 field does not necessarily hold
the current value of the L2 CR0.TS bit, so the code that checked for
L2's CR0.TS bit being set was incorrect. Moreover, I'm not sure that
the CR0.TS check was adequate. (What if L2's CR0.EM was set, for
instance?)

Fortunately, lazy FPU has gone away, so L0 has lost all interest in
intercepting #NM exceptions. See commit bd7e5b0899 ("KVM: x86:
remove code for lazy FPU handling"). Therefore, there is no longer any
question of which hypervisor gets first dibs. The #NM VM-exit should
always be reflected to L1. (Note that the corresponding bit must be
set in the VMCS12 exception_bitmap field for there to be an #NM
VM-exit at all.)

Fixes: ccf9844e5d ("kvm, vmx: Really fix lazy FPU on nested guest")
Reported-by: Abhiroop Dabral <adabral@paloaltonetworks.com>
Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Tested-by: Abhiroop Dabral <adabral@paloaltonetworks.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-10-17 00:29:47 +02:00
arch KVM: nVMX: Always reflect #NM VM-exits to L1 2018-10-17 00:29:47 +02:00
block blk-cgroup: increase number of supported policies 2018-09-11 10:59:53 -06:00
certs
crypto
Documentation KVM: x86: hyperv: implement PV IPI send hypercalls 2018-10-17 00:29:47 +02:00
drivers KVM: s390/vfio-ap: Fixes and enhancements for vfio-ap 2018-10-13 12:00:26 +02:00
firmware
fs This pull request contains fixes for UBIFS: 2018-09-21 15:29:44 +02:00
include KVM: x86: hyperv: implement PV IPI send hypercalls 2018-10-17 00:29:47 +02:00
init Kbuild updates for v4.19 (2nd) 2018-08-25 13:40:38 -07:00
ipc ipc/shm: properly return EIDRM in shm_lock() 2018-09-04 16:45:02 -07:00
kernel kernel/sys.c: remove duplicated include 2018-09-20 22:01:11 +02:00
lib lib/Kconfig.debug: fix three typos in help text 2018-09-04 16:45:02 -07:00
LICENSES
mm mm: slowly shrink slabs with a relatively small number of objects 2018-09-20 22:01:11 +02:00
net net/ipv6: do not copy dst flags on rt init 2018-09-17 19:42:14 -07:00
samples
scripts linux-kselftest-4.19-rc5 2018-09-17 07:24:28 +02:00
security Revert "x86/mm/legacy: Populate the user page-table with user pgd's" 2018-09-14 17:08:45 +02:00
sound ASoC: Fixes for v4.19 2018-09-17 18:59:21 +02:00
tools kvm: selftests: support high GPAs in dirty_log_test 2018-10-17 00:29:38 +02:00
usr initramfs: move gen_initramfs_list.sh from scripts/ to usr/ 2018-08-22 23:21:44 +09:00
virt KVM: x86: hyperv: optimize 'all cpus' case in kvm_hv_flush_tlb() 2018-10-17 00:29:44 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap libnvdimm-for-4.19_misc 2018-08-25 18:13:10 -07:00
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS KVM: s390: Features for 4.20 2018-10-04 17:12:45 +02:00
Makefile linux-kselftest-4.19-rc5 2018-09-17 07:24:28 +02:00
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.
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.