linux.git/Documentation/arm64, branch v5.12.5

arm64: kernel: disable CNP on Carmel

2021-03-25T10:00:23+00:00

On NVIDIA Carmel cores, CNP behaves differently than it does on standard
ARM cores. On Carmel, if two cores have CNP enabled and share an L2 TLB
entry created by core0 for a specific ASID, a non-shareable TLBI from
core1 may still see the shared entry. On standard ARM cores, that TLBI
will invalidate the shared entry as well.

This causes issues with patchsets that attempt to do local TLBIs based
on cpumasks instead of broadcast TLBIs. Avoid these issues by disabling
CNP support for NVIDIA Carmel cores.

Signed-off-by: Rich Wiley 
Link: https://lore.kernel.org/r/20210324002809.30271-1-rwiley@nvidia.com
[will: Fix pre-existing whitespace issue]
Signed-off-by: Will Deacon

Documentation: arm64/acpi : clarify arm64 support of IBFT

2021-03-22T12:43:20+00:00

In commit 94bccc340710 ("iscsi_ibft: make ISCSI_IBFT dependson ACPI instead
of ISCSI_IBFT_FIND") Kconfig was disentangled to make ISCSI_IBFT selection
not depend on x86.

Update arm64 acpi documentation, changing IBFT support status from
"Not Supported" to "Optional".
Opportunistically re-flow paragraph for changed lines.

Link: https://lore.kernel.org/lkml/1563475054-10680-1-git-send-email-thomas.tai@oracle.com/

Signed-off-by: Tom Saeger 
Reviewed-by: Konrad Rzeszutek Wilk 
Acked-by: Ard Biesheuvel 
Acked-by: Lorenzo Pieralisi 
Link: https://lore.kernel.org/r/9efc652df2b8d6b53d9acb170eb7c9ca3938dfef.1615920441.git.tom.saeger@oracle.com
Signed-off-by: Will Deacon

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2020-12-20T18:44:05+00:00

Pull KVM updates from Paolo Bonzini:
 "Much x86 work was pushed out to 5.12, but ARM more than made up for it.

  ARM:
   - PSCI relay at EL2 when "protected KVM" is enabled
   - New exception injection code
   - Simplification of AArch32 system register handling
   - Fix PMU accesses when no PMU is enabled
   - Expose CSV3 on non-Meltdown hosts
   - Cache hierarchy discovery fixes
   - PV steal-time cleanups
   - Allow function pointers at EL2
   - Various host EL2 entry cleanups
   - Simplification of the EL2 vector allocation

  s390:
   - memcg accouting for s390 specific parts of kvm and gmap
   - selftest for diag318
   - new kvm_stat for when async_pf falls back to sync

  x86:
   - Tracepoints for the new pagetable code from 5.10
   - Catch VFIO and KVM irqfd events before userspace
   - Reporting dirty pages to userspace with a ring buffer
   - SEV-ES host support
   - Nested VMX support for wait-for-SIPI activity state
   - New feature flag (AVX512 FP16)
   - New system ioctl to report Hyper-V-compatible paravirtualization features

  Generic:
   - Selftest improvements"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (171 commits)
  KVM: SVM: fix 32-bit compilation
  KVM: SVM: Add AP_JUMP_TABLE support in prep for AP booting
  KVM: SVM: Provide support to launch and run an SEV-ES guest
  KVM: SVM: Provide an updated VMRUN invocation for SEV-ES guests
  KVM: SVM: Provide support for SEV-ES vCPU loading
  KVM: SVM: Provide support for SEV-ES vCPU creation/loading
  KVM: SVM: Update ASID allocation to support SEV-ES guests
  KVM: SVM: Set the encryption mask for the SVM host save area
  KVM: SVM: Add NMI support for an SEV-ES guest
  KVM: SVM: Guest FPU state save/restore not needed for SEV-ES guest
  KVM: SVM: Do not report support for SMM for an SEV-ES guest
  KVM: x86: Update __get_sregs() / __set_sregs() to support SEV-ES
  KVM: SVM: Add support for CR8 write traps for an SEV-ES guest
  KVM: SVM: Add support for CR4 write traps for an SEV-ES guest
  KVM: SVM: Add support for CR0 write traps for an SEV-ES guest
  KVM: SVM: Add support for EFER write traps for an SEV-ES guest
  KVM: SVM: Support string IO operations for an SEV-ES guest
  KVM: SVM: Support MMIO for an SEV-ES guest
  KVM: SVM: Create trace events for VMGEXIT MSR protocol processing
  KVM: SVM: Create trace events for VMGEXIT processing
  ...

Merge tag 'docs-5.11' of git://git.lwn.net/linux

2020-12-15T00:55:54+00:00

Pull documentation updates from Jonathan Corbet:
 "A much quieter cycle for documentation (happily), with, one hopes, the
  bulk of the churn behind us. Significant stuff in this pull includes:

   - A set of new Chinese translations

   - Italian translation updates

   - A mechanism from Mauro to automatically format
     Documentation/features for the built docs

   - Automatic cross references without explicit :ref: markup

   - A new reset-controller document

   - An extensive new document on reporting problems from Thorsten

  That last patch also adds the CC-BY-4.0 license to LICENSES/dual;
  there was some discussion on this, but we seem to have consensus and
  an ack from Greg for that addition"

* tag 'docs-5.11' of git://git.lwn.net/linux: (50 commits)
  docs: fix broken cross reference in translations/zh_CN
  docs: Note that sphinx 1.7 will be required soon
  docs: update requirements to install six module
  docs: reporting-issues: move 'outdated, need help' note to proper place
  docs: Update documentation to reflect what TAINT_CPU_OUT_OF_SPEC means
  docs: add a reset controller chapter to the driver API docs
  docs: make reporting-bugs.rst obsolete
  docs: Add a new text describing how to report bugs
  LICENSES: Add the CC-BY-4.0 license
  Documentation: fix multiple typos found in the admin-guide subdirectory
  Documentation: fix typos found in admin-guide subdirectory
  kernel-doc: Fix example in Nested structs/unions
  docs: clean up sysctl/kernel: titles, version
  docs: trace: fix event state structure name
  docs: nios2: add missing ReST file
  scripts: get_feat.pl: reduce table width for all features output
  scripts: get_feat.pl: change the group by order
  scripts: get_feat.pl: make complete table more coincise
  scripts: kernel-doc: fix parsing function-like typedefs
  Documentation: fix typos found in process, dev-tools, and doc-guide subdirectories
  ...

Merge branches 'for-next/kvm-build-fix', 'for-next/va-refactor', 'for-next/lto', 'for-next/mem-hotplug', 'for-next/cppc-ffh', 'for-next/pad-image-header', 'for-next/zone-dma-default-32-bit', 'for-next/signal-tag-bits' and 'for-next/cmdline-extended' into for-next/core

2020-12-09T18:04:35+00:00

* for-next/kvm-build-fix:
  : Fix KVM build issues with 64K pages
  KVM: arm64: Fix build error in user_mem_abort()

* for-next/va-refactor:
  : VA layout changes
  arm64: mm: don't assume struct page is always 64 bytes
  Documentation/arm64: fix RST layout of memory.rst
  arm64: mm: tidy up top of kernel VA space
  arm64: mm: make vmemmap region a projection of the linear region
  arm64: mm: extend linear region for 52-bit VA configurations

* for-next/lto:
  : Upgrade READ_ONCE() to RCpc acquire on arm64 with LTO
  arm64: lto: Strengthen READ_ONCE() to acquire when CONFIG_LTO=y
  arm64: alternatives: Remove READ_ONCE() usage during patch operation
  arm64: cpufeatures: Add capability for LDAPR instruction
  arm64: alternatives: Split up alternative.h
  arm64: uaccess: move uao_* alternatives to asm-uaccess.h

* for-next/mem-hotplug:
  : Memory hotplug improvements
  arm64/mm/hotplug: Ensure early memory sections are all online
  arm64/mm/hotplug: Enable MEM_OFFLINE event handling
  arm64/mm/hotplug: Register boot memory hot remove notifier earlier
  arm64: mm: account for hotplug memory when randomizing the linear region

* for-next/cppc-ffh:
  : Add CPPC FFH support using arm64 AMU counters
  arm64: abort counter_read_on_cpu() when irqs_disabled()
  arm64: implement CPPC FFH support using AMUs
  arm64: split counter validation function
  arm64: wrap and generalise counter read functions

* for-next/pad-image-header:
  : Pad Image header to 64KB and unmap it
  arm64: head: tidy up the Image header definition
  arm64/head: avoid symbol names pointing into first 64 KB of kernel image
  arm64: omit [_text, _stext) from permanent kernel mapping

* for-next/zone-dma-default-32-bit:
  : Default to 32-bit wide ZONE_DMA (previously reduced to 1GB for RPi4)
  of: unittest: Fix build on architectures without CONFIG_OF_ADDRESS
  mm: Remove examples from enum zone_type comment
  arm64: mm: Set ZONE_DMA size based on early IORT scan
  arm64: mm: Set ZONE_DMA size based on devicetree's dma-ranges
  of: unittest: Add test for of_dma_get_max_cpu_address()
  of/address: Introduce of_dma_get_max_cpu_address()
  arm64: mm: Move zone_dma_bits initialization into zone_sizes_init()
  arm64: mm: Move reserve_crashkernel() into mem_init()
  arm64: Force NO_BLOCK_MAPPINGS if crashkernel reservation is required
  arm64: Ignore any DMA offsets in the max_zone_phys() calculation

* for-next/signal-tag-bits:
  : Expose the FAR_EL1 tag bits in siginfo
  arm64: expose FAR_EL1 tag bits in siginfo
  signal: define the SA_EXPOSE_TAGBITS bit in sa_flags
  signal: define the SA_UNSUPPORTED bit in sa_flags
  arch: provide better documentation for the arch-specific SA_* flags
  signal: clear non-uapi flag bits when passing/returning sa_flags
  arch: move SA_* definitions to generic headers
  parisc: start using signal-defs.h
  parisc: Drop parisc special case for __sighandler_t

* for-next/cmdline-extended:
  : Add support for CONFIG_CMDLINE_EXTENDED
  arm64: Extend the kernel command line from the bootloader
  arm64: kaslr: Refactor early init command line parsing

docs: archis: add a per-architecture features list

2020-12-03T22:10:15+00:00

Add a feature list matrix for each architecture to their
respective Kernel books.

Signed-off-by: Mauro Carvalho Chehab 
Link: https://lore.kernel.org/r/9c39d4dd93e05c0008205527d2c3450912f029ed.1606748711.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet

Documentation: Chinese translation of Documentation/arm64/elf_hwcaps.rst

2020-11-30T17:36:45+00:00

This is a Chinese translated version of
 Documentation/arm64/elf_hwcaps.rst

Signed-off-by: Bailu Lin 
Reviewed-by: Alex Shi 
Link: https://lore.kernel.org/r/20201124023846.34826-1-bailu.lin@vivo.com
Signed-off-by: Jonathan Corbet

arm64: expose FAR_EL1 tag bits in siginfo

2020-11-23T18:17:39+00:00

The kernel currently clears the tag bits (i.e. bits 56-63) in the fault
address exposed via siginfo.si_addr and sigcontext.fault_address. However,
the tag bits may be needed by tools in order to accurately diagnose
memory errors, such as HWASan [1] or future tools based on the Memory
Tagging Extension (MTE).

Expose these bits via the arch_untagged_si_addr mechanism, so that
they are only exposed to signal handlers with the SA_EXPOSE_TAGBITS
flag set.

[1] http://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html

Signed-off-by: Peter Collingbourne 
Reviewed-by: Catalin Marinas 
Link: https://linux-review.googlesource.com/id/Ia8876bad8c798e0a32df7c2ce1256c4771c81446
Link: https://lore.kernel.org/r/0010296597784267472fa13b39f8238d87a72cf8.1605904350.git.pcc@google.com
Signed-off-by: Catalin Marinas

arm64: spectre: Rename ARM64_HARDEN_EL2_VECTORS to ARM64_SPECTRE_V3A

2020-11-16T10:43:06+00:00

Since ARM64_HARDEN_EL2_VECTORS is really a mitigation for Spectre-v3a,
rename it accordingly for consistency with the v2 and v4 mitigation.

Signed-off-by: Will Deacon 
Signed-off-by: Marc Zyngier 
Cc: Marc Zyngier 
Cc: Quentin Perret 
Link: https://lore.kernel.org/r/20201113113847.21619-9-will@kernel.org

Documentation: Chinese translation of Documentation/arm64/perf.rst

2020-11-13T22:21:38+00:00

This is a Chinese translated version of
 Documentation/arm64/perf.rst

Signed-off-by: Bailu Lin 
Reviewed-by: Alex Shi 
Link: https://lore.kernel.org/r/20201030040541.8733-1-bailu.lin@vivo.com
Signed-off-by: Jonathan Corbet