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Claudio Imbrenda 42db0099ec KVM: s390: vsie: fix wrong VIR 37 when MSO is used 
[ Upstream commit 80aea01c48 ]

When the host invalidates a guest page, it will also check if the page
was used to map the prefix of any guest CPUs, in which case they are
stopped and marked as needing a prefix refresh. Upon starting the
affected CPUs again, their prefix pages are explicitly faulted in and
revalidated if they had been invalidated. A bit in the PGSTEs indicates
whether or not a page might contain a prefix. The bit is allowed to
overindicate. Pages above 2G are skipped, because they cannot be
prefixes, since KVM runs all guests with MSO = 0.

The same applies for nested guests (VSIE). When the host invalidates a
guest page that maps the prefix of the nested guest, it has to stop the
affected nested guest CPUs and mark them as needing a prefix refresh.
The same PGSTE bit used for the guest prefix is also used for the
nested guest. Pages above 2G are skipped like for normal guests, which
is the source of the bug.

The nested guest runs is the guest primary address space. The guest
could be running the nested guest using MSO != 0. If the MSO + prefix
for the nested guest is above 2G, the check for nested prefix will skip
it. This will cause the invalidation notifier to not stop the CPUs of
the nested guest and not mark them as needing refresh. When the nested
guest is run again, its prefix will not be refreshed, since it has not
been marked for refresh. This will cause a fatal validity intercept
with VIR code 37.

Fix this by removing the check for 2G for nested guests. Now all
invalidations of pages with the notify bit set will always scan the
existing VSIE shadow state descriptors.

This allows to catch invalidations of nested guest prefix mappings even
when the prefix is above 2G in the guest virtual address space.

Fixes: a3508fbe9d ("KVM: s390: vsie: initial support for nested virtualization")
Tested-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-ID: <20231102153549.53984-1-imbrenda@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-01-10 17:16:56 +01:00
arch KVM: s390: vsie: fix wrong VIR 37 when MSO is used 2024-01-10 17:16:56 +01:00
block blk-cgroup: bypass blkcg_deactivate_policy after destroying 2023-12-20 17:01:55 +01:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto crypto: xts - use 'spawn' for underlying single-block cipher 2024-01-10 17:16:54 +01:00
Documentation dt-bindings: nvmem: mxs-ocotp: Document fsl,ocotp 2024-01-01 12:42:42 +00:00
drivers ACPI: thermal: Fix acpi_thermal_unregister_thermal_zone() cleanup 2024-01-10 17:16:55 +01:00
fs mm: convert DAX lock/unlock page to lock/unlock folio 2024-01-10 17:16:53 +01:00
include crypto: hisilicon/qm - fix EQ/AEQ interrupt issue 2024-01-10 17:16:55 +01:00
init proc: sysctl: prevent aliased sysctls from getting passed to init 2023-11-28 17:19:57 +00:00
io_uring io_uring/cmd: fix breakage in SOCKET_URING_OP_SIOC* implementation 2023-12-20 17:01:52 +01:00
ipc Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
kernel rcu/tasks-trace: Handle new PF_IDLE semantics 2024-01-10 17:16:56 +01:00
lib maple_tree: do not preallocate nodes for slot stores 2024-01-05 15:19:43 +01:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/memory-failure: pass the folio and the page to collect_procs() 2024-01-10 17:16:54 +01:00
net tcp: derive delack_max from rto_min 2024-01-10 17:16:54 +01:00
rust rust: docs: fix logo replacement 2023-10-19 16:40:00 +02:00
samples vfio/mtty: Overhaul mtty interrupt handling 2024-01-10 17:16:55 +01:00
scripts scripts/checkstack.pl: match all stack sizes for s390 2023-12-20 17:01:59 +01:00
security apparmor: Fix move_mount mediation by detecting if source is detached 2024-01-10 17:16:52 +01:00
sound ASoC: meson: g12a-tohdmitx: Fix event generation for S/PDIF mux 2024-01-10 17:16:51 +01:00
tools bpftool: Align output skeleton ELF code 2024-01-10 17:16:54 +01:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt ARM: 2023-09-07 13:52:20 -07:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig
.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: rename binkernel.spec to kernel.spec 2023-07-25 00:59:33 +09:00
.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 Char/Misc driver fixes for 6.6-final 2023-10-28 07:51:27 -10:00
Makefile Linux 6.6.10 2024-01-05 15:19:45 +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.