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Mingwei Zhang 6d10c8c5ab KVM: x86/pmu: Fix type length error when reading pmu->fixed_ctr_ctrl 
commit 05519c86d6 upstream.

Use a u64 instead of a u8 when taking a snapshot of pmu->fixed_ctr_ctrl
when reprogramming fixed counters, as truncating the value results in KVM
thinking fixed counter 2 is already disabled (the bug also affects fixed
counters 3+, but KVM doesn't yet support those).  As a result, if the
guest disables fixed counter 2, KVM will get a false negative and fail to
reprogram/disable emulation of the counter, which can leads to incorrect
counts and spurious PMIs in the guest.

Fixes: 76d287b234 ("KVM: x86/pmu: Drop "u8 ctrl, int idx" for reprogram_fixed_counter()")
Cc: stable@vger.kernel.org
Signed-off-by: Mingwei Zhang <mizhang@google.com>
Link: https://lore.kernel.org/r/20240123221220.3911317-1-mizhang@google.com
[sean: rewrite changelog to call out the effects of the bug]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-02-23 09:51:49 +01:00
arch KVM: x86/pmu: Fix type length error when reading pmu->fixed_ctr_ctrl 2024-02-23 09:51:49 +01:00
block blk-iocost: Fix an UBSAN shift-out-of-bounds warning 2024-02-16 19:14:27 +01:00
certs This update includes the following changes: 2023-11-02 16:15:30 -10:00
crypto crypto: api - Disallow identical driver names 2024-01-31 16:20:54 -08:00
Documentation net: sysfs: Fix /sys/class/net/<iface> path for statistics 2024-02-23 09:51:27 +01:00
drivers serial: mxs-auart: fix tx 2024-02-23 09:51:49 +01:00
fs ksmbd: free aux buffer if ksmbd_iov_pin_rsp_read fails 2024-02-23 09:51:45 +01:00
include serial: core: introduce uart_port_tx_flags() 2024-02-23 09:51:49 +01:00
init update workarounds for gcc "asm goto" issue 2024-02-23 09:51:21 +01:00
io_uring io_uring/net: limit inline multishot retries 2024-02-16 19:14:31 +01:00
ipc Many singleton patches against the MM code. The patch series which are 2023-11-02 19:38:47 -10:00
kernel ftrace: Fix DIRECT_CALLS to use SAVE_REGS by default 2024-02-23 09:51:48 +01:00
lib Revert "kobject: Remove redundant checks for whether ktype is NULL" 2024-02-23 09:51:33 +01:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again 2024-02-23 09:51:29 +01:00
net net: hsr: remove WARN_ONCE() in send_hsr_supervision_frame() 2024-02-23 09:51:38 +01:00
rust rust: Ignore preserve-most functions 2024-01-25 15:45:09 -08:00
samples work around gcc bugs with 'asm goto' with outputs 2024-02-23 09:51:20 +01:00
scripts modpost: Add '.ltext' and '.ltext.*' to TEXT_SECTIONS 2024-02-23 09:51:39 +01:00
security lsm: fix the logic in security_inode_getsecctx() 2024-02-23 09:51:37 +01:00
sound ALSA: hda/realtek: fix mute/micmute LEDs for HP ZBook Power 2024-02-23 09:51:39 +01:00
tools selftests: mptcp: add mptcp_lib_kill_wait 2024-02-23 09:51:35 +01:00
usr arch: Remove Itanium (IA-64) architecture 2023-09-11 08:13:17 +00:00
virt KVM/arm64 fixes for 6.7, part #2 2023-12-22 18:03:54 -05:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: rpm-pkg: generate kernel.spec in rpmbuild/SPECS/ 2023-10-03 20:49:09 +09:00
.mailmap 12 hotfixes. 2 are cc:stable and the remainder either address post-6.7 2024-01-05 13:46:18 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS 12 hotfixes. 2 are cc:stable and the remainder either address post-6.7 2024-01-05 13:46:18 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS 12 hotfixes. 2 are cc:stable and the remainder either address post-6.7 2024-01-05 13:46:18 -08:00
Makefile Linux 6.7.5 2024-02-16 19:14:32 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.