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Marc Zyngier 6f796f0885 KVM: arm64: timer: Always evaluate the need for a soft timer 
commit b450dcce93 upstream.

When updating the interrupt state for an emulated timer, we return
early and skip the setup of a soft timer that runs in parallel
with the guest.

While this is OK if we have set the interrupt pending, it is pretty
wrong if the guest moved CVAL into the future.  In that case,
no timer is armed and the guest can wait for a very long time
(it will take a full put/load cycle for the situation to resolve).

This is specially visible with EDK2 running at EL2, but still
using the EL1 virtual timer, which in that case is fully emulated.
Any key-press takes ages to be captured, as there is no UART
interrupt and EDK2 relies on polling from a timer...

The fix is simply to drop the early return. If the timer interrupt
is pending, we will still return early, and otherwise arm the soft
timer.

Fixes: 4d74ecfa64 ("KVM: arm64: Don't arm a hrtimer for an already pending timer")
Cc: stable@vger.kernel.org
Tested-by: Dmytro Terletskyi <dmytro_terletskyi@epam.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20250204110050.150560-2-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-02-17 09:40:16 +01:00
arch KVM: arm64: timer: Always evaluate the need for a soft timer 2025-02-17 09:40:16 +01:00
block partitions: ldm: remove the initial kernel-doc notation 2025-02-08 09:51:43 +01:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto crypto: ecc - Prevent ecc_digits_from_bytes from reading too many bytes 2025-01-09 13:31:52 +01:00
Documentation dt-bindings: mfd: bd71815: Fix rsense and typos 2025-02-08 09:51:52 +01:00
drivers drm/modeset: Handle tiled displays in pan_display_atomic. 2025-02-17 09:40:15 +01:00
fs binfmt_flat: Fix integer overflow bug on 32 bit systems 2025-02-17 09:40:16 +01:00
include net: sched: Fix truncation of offloaded action statistics 2025-02-17 09:40:14 +01:00
init Compiler Attributes: disable __counted_by for clang < 19.1.3 2024-12-09 10:32:46 +01:00
io_uring io_uring/uring_cmd: use cached cmd_op in io_uring_cmd_sock() 2025-02-08 09:52:33 +01:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-09 10:32:54 +01:00
kernel printk: Fix signed integer overflow when defining LOG_BUF_LEN_MAX 2025-02-17 09:40:04 +01:00
lib lockdep: Fix upper limit for LOCKDEP_*_BITS configs 2025-02-17 09:40:03 +01:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm cachestat: fix page cache statistics permission checking 2025-02-01 18:37:54 +01:00
net rxrpc: Fix call state set to not include the SERVER_SECURING state 2025-02-17 09:40:14 +01:00
rust rust: macros: fix documentation of the paste! macro 2024-12-09 10:32:25 +01:00
samples samples/landlock: Fix possible NULL dereference in parse_path() 2025-02-08 09:51:57 +01:00
scripts kbuild: switch from lz4c to lz4 for compression 2025-02-08 09:52:35 +01:00
security tomoyo: don't emit warning in tomoyo_write_control() 2025-02-17 09:40:07 +01:00
sound ALSA: hda/realtek: Enable Mute LED on HP Laptop 14s-fq1xxx 2025-02-17 09:40:15 +01:00
tools udp: gso: do not drop small packets when PMTU reduces 2025-02-17 09:40:12 +01:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt KVM: Use dedicated mutex to protect kvm_usage_count to avoid deadlock 2024-10-04 16:29:47 +02:00
.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 Remove *.orig pattern from .gitignore 2024-10-04 16:29:44 +02:00
.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
.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 USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
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 membarrier: riscv: Add full memory barrier in switch_mm() 2024-09-12 11:11:45 +02:00
Makefile Linux 6.6.77 2025-02-11 09:37:33 +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.