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Jim Mattson 2259c17f01 kvm: x86: Sink cpuid update into vendor-specific set_cr4 functions 
On emulated VM-entry and VM-exit, update the CPUID bits that reflect
CR4.OSXSAVE and CR4.PKE.

This fixes a bug where the CPUID bits could continue to reflect L2 CR4
values after emulated VM-exit to L1. It also fixes a related bug where
the CPUID bits could continue to reflect L1 CR4 values after emulated
VM-entry to L2. The latter bug is mainly relevant to SVM, wherein
CPUID is not a required intercept. However, it could also be relevant
to VMX, because the code to conditionally update these CPUID bits
assumes that the guest CPUID and the guest CR4 are always in sync.

Fixes: 8eb3f87d90 ("KVM: nVMX: fix guest CR4 loading when emulating L2 to L1 exit")
Fixes: 2acf923e38 ("KVM: VMX: Enable XSAVE/XRSTOR for guest")
Fixes: b9baba8614 ("KVM, pkeys: expose CPUID/CR4 to guest")
Reported-by: Abhiroop Dabral <adabral@paloaltonetworks.com>
Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Cc: Haozhong Zhang <haozhong.zhang@intel.com>
Cc: Dexuan Cui <dexuan.cui@intel.com>
Cc: Huaitong Han <huaitong.han@intel.com>
Message-Id: <20201029170648.483210-1-jmattson@google.com>
2020-11-15 09:49:18 -05:00
arch kvm: x86: Sink cpuid update into vendor-specific set_cr4 functions 2020-11-15 09:49:18 -05:00
block
certs
crypto
Documentation KVM: Make dirty ring exclusive to dirty bitmap log 2020-11-15 09:49:16 -05:00
drivers vfio/virqfd: Drain events from eventfd in virqfd_wakeup() 2020-11-15 09:49:10 -05:00
fs eventfd: Export eventfd_ctx_do_read() 2020-11-15 09:49:10 -05:00
include KVM: Don't allocate dirty bitmap if dirty ring is enabled 2020-11-15 09:49:16 -05:00
init
ipc
kernel sched/wait: Add add_wait_queue_priority() 2020-11-15 09:49:09 -05:00
lib drm fixes for 5.10-rc3 2020-11-06 12:54:00 -08:00
LICENSES
mm mm/truncate.c: make __invalidate_mapping_pages() static 2020-11-02 12:14:19 -08:00
net Networking fixes for 5.10-rc4, including fixes from the bpf subtree. 2020-11-12 14:02:04 -08:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2020-11-06 17:49:34 -08:00
scripts Networking fixes for 5.10-rc4, including fixes from the bpf subtree. 2020-11-12 14:02:04 -08:00
security
sound ASoC: Fixes for v5.10 2020-11-05 18:19:32 +01:00
tools selftests: kvm: keep .gitignore add to date 2020-11-15 09:49:18 -05:00
usr
virt KVM: Don't allocate dirty bitmap if dirty ring is enabled 2020-11-15 09:49:16 -05:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS Networking fixes for 5.10-rc4, including fixes from the bpf subtree. 2020-11-12 14:02:04 -08:00
Makefile Linux 5.10-rc3 2020-11-08 16:10:16 -08:00
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.