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Filename Latest commit message Latest commit date
Marc Zyngier c5fe50e18f KVM: arm64: Don't access PMCR_EL0 when no PMU is available 
commit 2a5f1b67ec577fb1544b563086e0377f095f88e2 upstream.

We reset the guest's view of PMCR_EL0 unconditionally, based on
the host's view of this register. It is however legal for an
implementation not to provide any PMU, resulting in an UNDEF.

The obvious fix is to skip the reset of this shadow register
when no PMU is available, sidestepping the issue entirely.
If no PMU is available, the guest is not able to request
a virtual PMU anyway, so not doing nothing is the right thing
to do!

It is unlikely that this bug can hit any HW implementation
though, as they all provide a PMU. It has been found using nested
virt with the host KVM not implementing the PMU itself.

Fixes: ab9468340d ("arm64: KVM: Add access handler for PMCR register")
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201210083059.1277162-1-maz@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-17 14:05:38 +01:00
arch KVM: arm64: Don't access PMCR_EL0 when no PMU is available 2021-01-17 14:05:38 +01:00
block
certs
crypto crypto: asym_tpm: correct zero out potential secrets 2021-01-12 20:16:17 +01:00
Documentation
drivers net: mvpp2: disable force link UP during port init procedure 2021-01-17 14:05:38 +01:00
fs btrfs: send: fix wrong file path when there is an inode with a pending rmdir 2021-01-12 20:16:23 +01:00
include vmlinux.lds.h: Add PGO and AutoFDO input sections 2021-01-17 14:05:34 +01:00
init exec: Transform exec_update_mutex into a rw_semaphore 2021-01-09 13:44:55 +01:00
ipc
kernel workqueue: Kick a worker based on the actual activation of delayed works 2021-01-12 20:16:09 +01:00
lib lib/genalloc: fix the overflow when size is too big 2021-01-12 20:16:10 +01:00
LICENSES
mm
net nexthop: Unlink nexthop group entry in error path 2021-01-17 14:05:32 +01:00
samples
scripts depmod: handle the case of /sbin/depmod without /sbin in PATH 2021-01-12 20:16:10 +01:00
security
sound ALSA: hda/realtek: Add two "Intel Reference board" SSID in the ALC256. 2021-01-12 20:16:23 +01:00
tools bpftool: Fix compilation failure for net.o with older glibc 2021-01-17 14:05:37 +01:00
usr
virt kvm: check tlbs_dirty directly 2021-01-12 20:16:22 +01:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
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COPYING
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Kbuild
Kconfig
MAINTAINERS
Makefile Linux 5.4.89 2021-01-12 20:16:25 +01:00
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.