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Marc Zyngier ea78f77f78 KVM: arm64: Do not allow ID_AA64MMFR0_EL1.ASIDbits to be overridden 
commit 03c7527e97 upstream.

Catalin reports that a hypervisor lying to a guest about the size
of the ASID field may result in unexpected issues:

- if the underlying HW does only supports 8 bit ASIDs, the ASID
  field in a TLBI VAE1* operation is only 8 bits, and the HW will
  ignore the other 8 bits

- if on the contrary the HW is 16 bit capable, the ASID field
  in the same TLBI operation is always 16 bits, irrespective of
  the value of TCR_ELx.AS.

This could lead to missed invalidations if the guest was lead to
assume that the HW had 8 bit ASIDs while they really are 16 bit wide.

In order to avoid any potential disaster that would be hard to debug,
prenent the migration between a host with 8 bit ASIDs to one with
wider ASIDs (the converse was obviously always forbidden). This is
also consistent with what we already do for VMIDs.

If it becomes absolutely mandatory to support such a migration path
in the future, we will have to trap and emulate all TLBIs, something
that nobody should look forward to.

Fixes: d5a32b60dc ("KVM: arm64: Allow userspace to change ID_AA64MMFR{0-2}_EL1")
Reported-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Oliver Upton <oliver.upton@linux.dev>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20241203190236.505759-1-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-12-27 14:02:06 +01:00
arch KVM: arm64: Do not allow ID_AA64MMFR0_EL1.ASIDbits to be overridden 2024-12-27 14:02:06 +01:00
block block: Fix potential deadlock while freezing queue and acquiring sysfs_lock 2024-12-19 18:13:22 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: ecdsa - Avoid signed integer overflow on signature decoding 2024-12-14 20:03:36 +01:00
Documentation Documentation: networking: Add a caveat to nexthop_compat_mode sysctl 2024-12-19 18:13:16 +01:00
drivers EDAC/amd64: Simplify ECC check on unified memory controllers 2024-12-27 14:02:06 +01:00
fs ksmbd: fix broken transfers when exceeding max simultaneous operations 2024-12-27 14:02:03 +01:00
include sched/dlserver: Fix dlserver double enqueue 2024-12-27 14:01:59 +01:00
init Compiler Attributes: disable __counted_by for clang < 19.1.3 2024-12-05 14:02:45 +01:00
io_uring io_uring/tctx: work around xa_store() allocation error issue 2024-12-14 20:04:10 +01:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-05 14:03:02 +01:00
kernel sched/dlserver: Fix dlserver time accounting 2024-12-27 14:01:59 +01:00
lib timekeeping: Remove CONFIG_DEBUG_TIMEKEEPING 2024-12-14 20:04:16 +01:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm memcg: slub: fix SUnreclaim for post charged objects 2024-12-19 18:13:01 +01:00
net psample: adjust size if rate_as_probability is set 2024-12-27 14:02:06 +01:00
rust rust: kbuild: set bindgen's Rust target version 2024-12-19 18:13:22 +01:00
samples samples/bpf: Fix a resource leak 2024-12-14 20:03:46 +01:00
scripts setlocalversion: work around "git describe" performance 2024-12-14 20:04:10 +01:00
security apparmor: test: Fix memory leak for aa_unpack_strdup() 2024-12-05 14:02:46 +01:00
sound firmware: arm_scmi: Fix i.MX build dependency 2024-12-27 14:01:57 +01:00
tools selftests: openvswitch: fix tcpdump execution 2024-12-27 14:02:05 +01:00
usr initramfs: shorten cmd_initfs in usr/Makefile 2024-07-16 01:07:52 +09:00
virt KVM: x86: switch hugepage recovery thread to vhost_task 2024-12-05 14:02:43 +01:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Kbuild updates for v6.12 2024-09-24 13:02:06 -07:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -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 MAINTAINERS: Remove self from DSA entry 2024-11-03 12:52:38 -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 MAINTAINERS: update location of media main tree 2024-12-05 14:02:42 +01:00
Makefile Linux 6.12.6 2024-12-19 18:13:24 +01:00
README README: Fix spelling 2024-03-18 03:36:32 -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 reStructuredText 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.