| Age | Commit message (Collapse) | Author | Files | Lines |
|---|
|
Add a new helper to retrieve the RESx values for a given system
register, and use it for the runtime sanitisation.
This results in slightly better code generation for a fairly hot
path in the hypervisor, and additionally covers all sanitised
registers in all conditions, not just the VNCR-based ones.
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-6-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
|
|
We have so far mostly tracked RES0 bits, but only made a few attempts
at being just as strict for RES1 bits (probably because they are both
rarer and harder to handle).
Start scratching the surface by introducing a data structure tracking
RES0 and RES1 bits at the same time.
Note that contrary to the usual idiom, this structure is mostly passed
around by value -- the ABI handles it nicely, and the resulting code is
much nicer.
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-5-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
|
|
Computing the FGU bits is made oddly complicated, as we use the RES0
helper instead of using a specific abstraction.
Introduce such an abstraction, which is going to make things significantly
simpler in the future.
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-4-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
|
|
We already have specific constraints for SCTLR_EL1.{EE,E0E}, and
making them depend on FEAT_AA64EL1 is just buggy.
Fixes: 6bd4a274b026e ("KVM: arm64: Convert SCTLR_EL1 to config-driven sanitisation")
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-3-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
|
|
Convert SCTLR_EL2 to the sysreg infrastructure, as per the 2025-12_rel
revision of the Registers.json file.
Note that we slightly deviate from the above, as we stick to the ARM
ARM M.a definition of SCTLR_EL2[9], which is RES0, in order to avoid
dragging the POE2 definitions...
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-2-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
|
|
kvm_types.h is mandatory in include/asm-generic/Kbuild so having it
in another Kbuild file causes a warning. Remove it from the arch/
Kbuild file to fix the warning.
../scripts/Makefile.asm-headers:39: redundant generic-y found in ../arch/s390/include/asm/Kbuild: kvm_types.h
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260203184204.1329414-1-rdunlap@infradead.org
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull misc fixes from Andrew Morton:
"Five hotfixes. Two are cc:stable, two are for MM.
All are singletons - please see the changelogs for details"
* tag 'mm-hotfixes-stable-2026-02-04-15-55' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
Documentation: document liveupdate cmdline parameter
mm, shmem: prevent infinite loop on truncate race
mailmap: update Alexander Mikhalitsyn's emails
liveupdate: luo_file: do not clear serialized_data on unfreeze
x86/kfence: fix booting on 32bit non-PAE systems
|
|
Pull KVM fixes from Paolo Bonzini:
- Fix a bug where AVIC is incorrectly inhibited when running with
x2AVIC disabled via module param (or on a system without x2AVIC)
- Fix a dangling device posted IRQs bug by explicitly checking if the
irqfd is still active (on the list) when handling an eventfd signal,
instead of zeroing the irqfd's routing information when the irqfd is
deassigned.
Zeroing the irqfd's routing info causes arm64 and x86's to not
disable posting for the IRQ (kvm_arch_irq_bypass_del_producer() looks
for an MSI), incorrectly leaving the IRQ in posted mode (and leading
to use-after-free and memory leaks on AMD in particular).
This is both the most pressing and scariest, but it's been in -next
for a while.
- Disable FORTIFY_SOURCE for KVM selftests to prevent the compiler from
generating calls to the checked versions of memset() and friends,
which leads to unexpected page faults in guest code due e.g.
__memset_chk@plt not being resolved.
- Explicitly configure the supported XSS capabilities from within
{svm,vmx}_set_cpu_caps() to fix a bug where VMX will compute the
reference VMCS configuration with SHSTK and IBT enabled, but then
compute each CPUs local config with SHSTK and IBT disabled if not all
CET xfeatures are enabled, e.g. if the kernel is built with
X86_KERNEL_IBT=n.
The mismatch in features results in differing nVMX setting, and
ultimately causes kvm-intel.ko to refuse to load with nested=1.
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: x86: Explicitly configure supported XSS from {svm,vmx}_set_cpu_caps()
KVM: selftests: Add -U_FORTIFY_SOURCE to avoid some unpredictable test failures
KVM: x86: Assert that non-MSI doesn't have bypass vCPU when deleting producer
KVM: Don't clobber irqfd routing type when deassigning irqfd
KVM: SVM: Check vCPU ID against max x2AVIC ID if and only if x2AVIC is enabled
|
|
Final KVM fixes for 6.19:
- Fix a bug where AVIC is incorrectly inhibited when running with x2AVIC
disabled via module param (or on a system without x2AVIC).
- Fix a dangling device posted IRQs bug by explicitly checking if the irqfd is
still active (on the list) when handling an eventfd signal, instead of
zeroing the irqfd's routing information when the irqfd is deassigned.
Zeroing the irqfd's routing info causes arm64 and x86's to not disable
posting for the IRQ (kvm_arch_irq_bypass_del_producer() looks for an MSI),
incorrectly leaving the IRQ in posted mode (and leading to use-after-free
and memory leaks on AMD in particular).
This is both the most pressing and scariest, but it's been in -next for
a while.
- Disable FORTIFY_SOURCE for KVM selftests to prevent the compiler from
generating calls to the checked versions of memset() and friends, which
leads to unexpected page faults in guest code due e.g. __memset_chk@plt
not being resolved.
- Explicitly configure the support XSS from within {svm,vmx}_set_cpu_caps() to
fix a bug where VMX will compute the reference VMCS configuration with SHSTK
and IBT enabled, but then compute each CPUs local config with SHSTK and IBT
disabled if not all CET xfeatures are enabled, e.g. if the kernel is built
with X86_KERNEL_IBT=n. The mismatch in features results in differing nVMX
setting, and ultimately causes kvm-intel.ko to refuse to load with nested=1.
|
|
Add a new IOCTL to allow userspace to manipulate storage keys directly.
This will make it easier to write selftests related to storage keys.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
While userspace is allowed to have pages of any size, the new gmap
would always use 4k pages to back the guest.
Enable 1M pages for gmap.
This allows 1M pages to be used to back a guest when userspace is using
1M pages for the corresponding addresses (e.g. THP or hugetlbfs).
Remove the limitation that disallowed having nested guests and
hugepages at the same time.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Remove the PGSTE config option.
Remove all code from linux/s390 mm that involves PGSTEs.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Remove the now unused include/asm/gmap.h and mm/gmap.c files.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Switch KVM/s390 to use the new gmap code.
Remove includes to <gmap.h> and include "gmap.h" instead; fix all the
existing users of the old gmap functions to use the new ones instead.
Fix guest storage key access functions to work with the new gmap.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Refactor some storage key functions to improve readability.
Introduce helper functions that will be used in the next patches.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Switch to using IS_ENABLED(CONFIG_KVM) instead of CONFIG_PGSTE, since
the latter will be removed soon.
Many CONFIG_PGSTE are left behind, because they will be removed
completely in upcoming patches. The ones replaced here are mostly the
ones that will stay.
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Implement gmap_protect_asce_top_level(), which was a stub. This
function was a stub due to cross dependencies with other patches.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Add some helper functions for handling multiple guest faults at the
same time.
This will be needed for VSIE, where a nested guest access also needs to
access all the page tables that map it.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
New gmap (guest map) code. This new gmap code will only be used by KVM.
This will replace the existing gmap.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Add page table management functions to be used for KVM guest (gmap)
page tables.
This patch adds functions to handle CMMA and the ESSA instruction.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Add page table management functions to be used for KVM guest (gmap)
page tables.
This patch adds functions to handle memslot creation and destruction,
additional per-pagetable data stored in the PGSTEs, mapping physical
addresses into the gmap, and marking address ranges as prefix.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Add page table management functions to be used for KVM guest (gmap)
page tables.
This patch adds functions related to storage key handling.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Add page table management functions to be used for KVM guest (gmap)
page tables.
This patch adds functions to walk to specific table entries, or to
perform actions on a range of entries.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Add page table management functions to be used for KVM guest (gmap)
page tables.
This patch adds functions to clear, replace or exchange DAT table
entries.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Add page table management functions to be used for KVM guest (gmap)
page tables.
This patch adds the boilerplate and functions for the allocation and
deallocation of DAT tables.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Add KVM-s390 specific bitfields and helper functions to manipulate DAT
tables.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Rename some functions in gaccess.c to add a _gva or _gpa suffix to
indicate whether the function accepts a virtual or a guest-absolute
address.
This makes it easier to understand the code.
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Enable KVM_GENERIC_MMU_NOTIFIER, for now with empty placeholder callbacks.
Also enable KVM_MMU_LOCKLESS_AGING and define KVM_HAVE_MMU_RWLOCK.
Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Pass the gmap explicitly as parameter, instead of just using
vsie_page->gmap.
This will be used in upcoming patches.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
If uv_convert_from_secure_pte() fails, the page becomes unusable by the
host. The failure can only occour in case of hardware malfunction or a
serious KVM bug.
When the unusable page is reused, the system can have issues and
hang.
Print a warning to aid debugging such unlikely scenarios.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Export __make_folio_secure() and s390_wiggle_split_folio(), as they will
be needed to be used by KVM.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Introduce import_lock to avoid future races when converting pages to
secure.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Add gmap_helper_set_unused() to mark userspace ptes as unused.
Core mm code will use that information to discard unused pages instead
of attempting to swap them.
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Tested-by: Nico Boehr <nrb@linux.ibm.com>
Acked-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Move the sske_frame() function to asm/pgtable.h, so it can be used in
other modules too.
Opportunistically convert the .insn opcode specification to the
appropriate mnemonic.
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
uv_destroy_folio() and uv_convert_from_secure_folio() should work on
all pages in the folio, not just the first one.
This was fine until now, but it will become a problem with upcoming
patches.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Add P bit in hardware definition of region 3 and segment table entries.
Move union vaddress from kvm/gaccess.c to asm/dat_bits.h
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
Move the pgste lock and unlock functions back into mm/pgtable.c and
duplicate them in mm/gmap_helpers.c to avoid function name collisions
later on.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/dinguyen/linux into soc/dt
SoCFPGA DTS updates for v6.20, version 3
- dt-bindings updates:
- Add intel,socfpga-agilex5-socdk-modular for the Agilex5 mod board
- Add intel,socfpga-agilex-emmc for the Agilex eMMC daughter board
- Move entries in intel,socfpga.yaml into altera.yaml
- Add syscon as a fallback for sys-mgr
- Add dma-cohrerent property for Agilex5 NAND and DMA
- Add support for the Agilex5 modular board
- Add IOMMUS property for ethernet nodes for Agilex5
- Use lowercase hex for dts files
- Add #address-cells and #size-cells for sram
- Fix dtbs_check warning for fpga-region
- Move dma controller node for Agilex5 under simple-bus
- Add support for the Agilex eMMC daughter board
* tag 'socfpga_dts_updates_for_v6.20_v3' of git://git.kernel.org/pub/scm/linux/kernel/git/dinguyen/linux:
dt-bindings: intel: Add Agilex eMMC support
arm64: dts: socfpga: agilex: add emmc support
arm64: dts: intel: agilex5: Add simple-bus node on top of dma controller node
ARM: dts: socfpga: fix dtbs_check warning for fpga-region
ARM: dts: socfpga: add #address-cells and #size-cells for sram node
dt-bindings: altera: document syscon as fallback for sys-mgr
arm64: dts: altera: Use lowercase hex
dt-bindings: arm: altera: combine Intel's SoCFPGA into altera.yaml
arm64: dts: socfpga: agilex5: Add IOMMUS property for ethernet nodes
arm64: dts: socfpga: agilex5: add support for modular board
dt-bindings: intel: Add Agilex5 SoCFPGA modular board
arm64: dts: socfpga: agilex5: Add dma-coherent property
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
|
|
The LOAD_DISPLAY (LDD) X'9F' is still accepted by the Virtual Tape
Server (VTS) but does not perform any action.
Remove all functions and definitions related to this command.
The tape_34xx_ioctl() function is also removed as it was mainly used to
handle additional ioctl functionality. LOAD_DISPLAY was the only left
case. All other ioctls are handled in tapechar_ioctl().
With LOAD_DISPLAY, the remaining definitions in asm/tape390.h are gone.
Delete the file.
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
|
|
Physical 3590/3592 tape models are not supported anymore for a very long
time. The Virtual Tape Server (VTS) emulates and presents only 3490E
models to the host. This is the only supported model and storage server.
Remove the entire code base for 3590/3592 models as it can be considered
dead code for quite some time already.
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
|
|
The comment in hyperv_cleanup() became out-of-date as a result of
commit c8ed0812646e ("x86/hyperv: Use direct call to hypercall-page").
Update the comment. No code or functional change.
Signed-off-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
|
|
When running with a paravisor and SEV-SNP, the GHCB page is provided
by the paravisor instead of being allocated by Linux. The provided page
is normal memory, but is outside of the physical address space seen by
Linux. As such it cannot be accessed via the kernel's direct map, and
must be explicitly mapped to a kernel virtual address.
Current code uses ioremap_cache() and iounmap() to map and unmap the page.
These functions are for use on I/O address space that may not behave as
normal memory, so they generate or expect addresses with the __iomem
attribute. For normal memory, the preferred functions are memremap() and
memunmap(), which operate similarly but without __iomem.
At the time of the original work on CoCo VMs on Hyper-V, memremap() did not
support creating a decrypted mapping, so ioremap_cache() was used instead,
since I/O address space is always mapped decrypted. memremap() has since
been enhanced to allow decrypted mappings, so replace ioremap_cache() with
memremap() when mapping the GHCB page. Similarly, replace iounmap() with
memunmap(). As a side benefit, the replacement cleans up 'sparse' warnings
about __iomem mismatches.
The replacement is done to use the correct functions as long-term goodness
and to clean up the sparse warnings. No runtime bugs are fixed.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202311111925.iPGGJik4-lkp@intel.com/
Signed-off-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
|
|
hv_root_crash_init() is not setting up the hypervisor crash collection
for baremetal cases because when it's called, hypervisor page is not
setup.
Fix is simple, just move the crash init call after the hypercall
page setup.
Signed-off-by: Mukesh Rathor <mrathor@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
|
|
Fix a compiler warning that status is defined by not used.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202512301641.FC6OAbGM-lkp@intel.com/
Signed-off-by: Mukesh R <mrathor@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
|
|
Use scoped for-each loop when iterating over device nodes to make code a
bit simpler.
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Link: https://patch.msgid.link/20260109-of-for-each-compatible-scoped-v3-5-c22fa2c0749a@oss.qualcomm.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
|
|
Use scoped for-each loop when iterating over device nodes to make code a
bit simpler.
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Link: https://patch.msgid.link/20260109-of-for-each-compatible-scoped-v3-4-c22fa2c0749a@oss.qualcomm.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
|
|
Use scoped for-each loop when iterating over device nodes to make code a
bit simpler.
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260109-of-for-each-compatible-scoped-v3-3-c22fa2c0749a@oss.qualcomm.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
|
|
Use scoped for-each loop when iterating over device nodes to make code a
bit simpler.
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>
Link: https://patch.msgid.link/20260109-of-for-each-compatible-scoped-v3-2-c22fa2c0749a@oss.qualcomm.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
|
|
When none of the allowed CPUs of a task are online, it gets migrated
to the fallback cpumask which is all the non nohz_full CPUs.
However just like nohz_full CPUs, domain isolated CPUs don't want to be
disturbed by tasks that have lost their CPU affinities.
And since nohz_full rely on domain isolation to work correctly, the
housekeeping mask of domain isolated CPUs should always be a subset of
the housekeeping mask of nohz_full CPUs (there can be CPUs that are
domain isolated but not nohz_full, OTOH there shouldn't be nohz_full
CPUs that are not domain isolated):
HK_TYPE_DOMAIN & HK_TYPE_KERNEL_NOISE == HK_TYPE_DOMAIN
Therefore use HK_TYPE_DOMAIN as the appropriate fallback target for
tasks. Note that cpuset isolated partitions are not supported on those
systems and may result in undefined behaviour.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Reviewed-by: Waiman Long <longman@redhat.com>
Acked-by: Will Deacon <will@kernel.org>
Tested-by: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marco Crivellari <marco.crivellari@suse.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Waiman Long <longman@redhat.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
|
|
Currently, if the command line passed to kexec_file_load() exceeds
the supported limit of the kernel being kexec'd, -EINVAL is returned
to userspace, which is consistent across architectures. Since
-EINVAL is not specific to this case, the kexec tool cannot provide
a specific reason for the failure. Many architectures emit an error
message in this case. Add a similar error message, including the
effective limit, since the command line length is configurable.
Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
|
