linux-stable.git/Documentation/virt, branch v6.14 Linux kernel stable tree KVM: s390: fake memslot for ucontrol VMs 2025-01-31T11:03:52+00:00 Claudio Imbrenda imbrenda@linux.ibm.com 2025-01-23T14:46:15+00:00 413c98f24c63b3b8aff202fce6f01e8950730511 Create a fake memslot for ucontrol VMs. The fake memslot identity-maps userspace. Now memslots will always be present, and ucontrol is not a special case anymore. Suggested-by: Sean Christopherson <seanjc@google.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Janosch Frank <frankja@linux.ibm.com> Link: https://lore.kernel.org/r/20250123144627.312456-4-imbrenda@linux.ibm.com Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Message-ID: <20250123144627.312456-4-imbrenda@linux.ibm.com> 
Create a fake memslot for ucontrol VMs. The fake memslot identity-maps
userspace.

Now memslots will always be present, and ucontrol is not a special case
anymore.

Suggested-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20250123144627.312456-4-imbrenda@linux.ibm.com
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20250123144627.312456-4-imbrenda@linux.ibm.com>
Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux 2025-01-28T17:01:36+00:00 Linus Torvalds torvalds@linux-foundation.org 2025-01-28T17:01:36+00:00 e2ee2e9b159094527ae7ad78058b1316f62fc5b7 Pull KVM/arm64 updates from Will Deacon: "New features: - Support for non-protected guest in protected mode, achieving near feature parity with the non-protected mode - Support for the EL2 timers as part of the ongoing NV support - Allow control of hardware tracing for nVHE/hVHE Improvements, fixes and cleanups: - Massive cleanup of the debug infrastructure, making it a bit less awkward and definitely easier to maintain. This should pave the way for further optimisations - Complete rewrite of pKVM's fixed-feature infrastructure, aligning it with the rest of KVM and making the code easier to follow - Large simplification of pKVM's memory protection infrastructure - Better handling of RES0/RES1 fields for memory-backed system registers - Add a workaround for Qualcomm's Snapdragon X CPUs, which suffer from a pretty nasty timer bug - Small collection of cleanups and low-impact fixes" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (87 commits) arm64/sysreg: Get rid of TRFCR_ELx SysregFields KVM: arm64: nv: Fix doc header layout for timers KVM: arm64: nv: Apply RESx settings to sysreg reset values KVM: arm64: nv: Always evaluate HCR_EL2 using sanitising accessors KVM: arm64: Fix selftests after sysreg field name update coresight: Pass guest TRFCR value to KVM KVM: arm64: Support trace filtering for guests KVM: arm64: coresight: Give TRBE enabled state to KVM coresight: trbe: Remove redundant disable call arm64/sysreg/tools: Move TRFCR definitions to sysreg tools: arm64: Update sysreg.h header files KVM: arm64: Drop pkvm_mem_transition for host/hyp donations KVM: arm64: Drop pkvm_mem_transition for host/hyp sharing KVM: arm64: Drop pkvm_mem_transition for FF-A KVM: arm64: Explicitly handle BRBE traps as UNDEFINED KVM: arm64: vgic: Use str_enabled_disabled() in vgic_v3_probe() arm64: kvm: Introduce nvhe stack size constants KVM: arm64: Fix nVHE stacktrace VA bits mask KVM: arm64: Fix FEAT_MTE in pKVM Documentation: Update the behaviour of "kvm-arm.mode" ... 
Pull KVM/arm64 updates from Will Deacon:
 "New features:

   - Support for non-protected guest in protected mode, achieving near
     feature parity with the non-protected mode

   - Support for the EL2 timers as part of the ongoing NV support

   - Allow control of hardware tracing for nVHE/hVHE

  Improvements, fixes and cleanups:

   - Massive cleanup of the debug infrastructure, making it a bit less
     awkward and definitely easier to maintain. This should pave the way
     for further optimisations

   - Complete rewrite of pKVM's fixed-feature infrastructure, aligning
     it with the rest of KVM and making the code easier to follow

   - Large simplification of pKVM's memory protection infrastructure

   - Better handling of RES0/RES1 fields for memory-backed system
     registers

   - Add a workaround for Qualcomm's Snapdragon X CPUs, which suffer
     from a pretty nasty timer bug

   - Small collection of cleanups and low-impact fixes"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (87 commits)
  arm64/sysreg: Get rid of TRFCR_ELx SysregFields
  KVM: arm64: nv: Fix doc header layout for timers
  KVM: arm64: nv: Apply RESx settings to sysreg reset values
  KVM: arm64: nv: Always evaluate HCR_EL2 using sanitising accessors
  KVM: arm64: Fix selftests after sysreg field name update
  coresight: Pass guest TRFCR value to KVM
  KVM: arm64: Support trace filtering for guests
  KVM: arm64: coresight: Give TRBE enabled state to KVM
  coresight: trbe: Remove redundant disable call
  arm64/sysreg/tools: Move TRFCR definitions to sysreg
  tools: arm64: Update sysreg.h header files
  KVM: arm64: Drop pkvm_mem_transition for host/hyp donations
  KVM: arm64: Drop pkvm_mem_transition for host/hyp sharing
  KVM: arm64: Drop pkvm_mem_transition for FF-A
  KVM: arm64: Explicitly handle BRBE traps as UNDEFINED
  KVM: arm64: vgic: Use str_enabled_disabled() in vgic_v3_probe()
  arm64: kvm: Introduce nvhe stack size constants
  KVM: arm64: Fix nVHE stacktrace VA bits mask
  KVM: arm64: Fix FEAT_MTE in pKVM
  Documentation: Update the behaviour of "kvm-arm.mode"
  ...
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2025-01-25T17:55:09+00:00 Linus Torvalds torvalds@linux-foundation.org 2025-01-25T17:55:09+00:00 0f8e26b38d7ac72b3ad764944a25dd5808f37a6e Pull kvm updates from Paolo Bonzini: "Loongarch: - Clear LLBCTL if secondary mmu mapping changes - Add hypercall service support for usermode VMM x86: - Add a comment to kvm_mmu_do_page_fault() to explain why KVM performs a direct call to kvm_tdp_page_fault() when RETPOLINE is enabled - Ensure that all SEV code is compiled out when disabled in Kconfig, even if building with less brilliant compilers - Remove a redundant TLB flush on AMD processors when guest CR4.PGE changes - Use str_enabled_disabled() to replace open coded strings - Drop kvm_x86_ops.hwapic_irr_update() as KVM updates hardware's APICv cache prior to every VM-Enter - Overhaul KVM's CPUID feature infrastructure to track all vCPU capabilities instead of just those where KVM needs to manage state and/or explicitly enable the feature in hardware. Along the way, refactor the code to make it easier to add features, and to make it more self-documenting how KVM is handling each feature - Rework KVM's handling of VM-Exits during event vectoring; this plugs holes where KVM unintentionally puts the vCPU into infinite loops in some scenarios (e.g. if emulation is triggered by the exit), and brings parity between VMX and SVM - Add pending request and interrupt injection information to the kvm_exit and kvm_entry tracepoints respectively - Fix a relatively benign flaw where KVM would end up redoing RDPKRU when loading guest/host PKRU, due to a refactoring of the kernel helpers that didn't account for KVM's pre-checking of the need to do WRPKRU - Make the completion of hypercalls go through the complete_hypercall function pointer argument, no matter if the hypercall exits to userspace or not. Previously, the code assumed that KVM_HC_MAP_GPA_RANGE specifically went to userspace, and all the others did not; the new code need not special case KVM_HC_MAP_GPA_RANGE and in fact does not care at all whether there was an exit to userspace or not - As part of enabling TDX virtual machines, support support separation of private/shared EPT into separate roots. When TDX will be enabled, operations on private pages will need to go through the privileged TDX Module via SEAMCALLs; as a result, they are limited and relatively slow compared to reading a PTE. The patches included in 6.14 allow KVM to keep a mirror of the private EPT in host memory, and define entries in kvm_x86_ops to operate on external page tables such as the TDX private EPT - The recently introduced conversion of the NX-page reclamation kthread to vhost_task moved the task under the main process. The task is created as soon as KVM_CREATE_VM was invoked and this, of course, broke userspace that didn't expect to see any child task of the VM process until it started creating its own userspace threads. In particular crosvm refuses to fork() if procfs shows any child task, so unbreak it by creating the task lazily. This is arguably a userspace bug, as there can be other kinds of legitimate worker tasks and they wouldn't impede fork(); but it's not like userspace has a way to distinguish kernel worker tasks right now. Should they show as "Kthread: 1" in proc/.../status? x86 - Intel: - Fix a bug where KVM updates hardware's APICv cache of the highest ISR bit while L2 is active, while ultimately results in a hardware-accelerated L1 EOI effectively being lost - Honor event priority when emulating Posted Interrupt delivery during nested VM-Enter by queueing KVM_REQ_EVENT instead of immediately handling the interrupt - Rework KVM's processing of the Page-Modification Logging buffer to reap entries in the same order they were created, i.e. to mark gfns dirty in the same order that hardware marked the page/PTE dirty - Misc cleanups Generic: - Cleanup and harden kvm_set_memory_region(); add proper lockdep assertions when setting memory regions and add a dedicated API for setting KVM-internal memory regions. The API can then explicitly disallow all flags for KVM-internal memory regions - Explicitly verify the target vCPU is online in kvm_get_vcpu() to fix a bug where KVM would return a pointer to a vCPU prior to it being fully online, and give kvm_for_each_vcpu() similar treatment to fix a similar flaw - Wait for a vCPU to come online prior to executing a vCPU ioctl, to fix a bug where userspace could coerce KVM into handling the ioctl on a vCPU that isn't yet onlined - Gracefully handle xarray insertion failures; even though such failures are impossible in practice after xa_reserve(), reserving an entry is always followed by xa_store() which does not know (or differentiate) whether there was an xa_reserve() before or not RISC-V: - Zabha, Svvptc, and Ziccrse extension support for guests. None of them require anything in KVM except for detecting them and marking them as supported; Zabha adds byte and halfword atomic operations, while the others are markers for specific operation of the TLB and of LL/SC instructions respectively - Virtualize SBI system suspend extension for Guest/VM - Support firmware counters which can be used by the guests to collect statistics about traps that occur in the host Selftests: - Rework vcpu_get_reg() to return a value instead of using an out-param, and update all affected arch code accordingly - Convert the max_guest_memory_test into a more generic mmu_stress_test. The basic gist of the "conversion" is to have the test do mprotect() on guest memory while vCPUs are accessing said memory, e.g. to verify KVM and mmu_notifiers are working as intended - Play nice with treewrite builds of unsupported architectures, e.g. arm (32-bit), as KVM selftests' Makefile doesn't do anything to ensure the target architecture is actually one KVM selftests supports - Use the kernel's $(ARCH) definition instead of the target triple for arch specific directories, e.g. arm64 instead of aarch64, mainly so as not to be different from the rest of the kernel - Ensure that format strings for logging statements are checked by the compiler even when the logging statement itself is disabled - Attempt to whack the last LLC references/misses mole in the Intel PMU counters test by adding a data load and doing CLFLUSH{OPT} on the data instead of the code being executed. It seems that modern Intel CPUs have learned new code prefetching tricks that bypass the PMU counters - Fix a flaw in the Intel PMU counters test where it asserts that events are counting correctly without actually knowing what the events count given the underlying hardware; this can happen if Intel reuses a formerly microarchitecture-specific event encoding as an architectural event, as was the case for Top-Down Slots" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (151 commits) kvm: defer huge page recovery vhost task to later KVM: x86/mmu: Return RET_PF* instead of 1 in kvm_mmu_page_fault() KVM: Disallow all flags for KVM-internal memslots KVM: x86: Drop double-underscores from __kvm_set_memory_region() KVM: Add a dedicated API for setting KVM-internal memslots KVM: Assert slots_lock is held when setting memory regions KVM: Open code kvm_set_memory_region() into its sole caller (ioctl() API) LoongArch: KVM: Add hypercall service support for usermode VMM LoongArch: KVM: Clear LLBCTL if secondary mmu mapping is changed KVM: SVM: Use str_enabled_disabled() helper in svm_hardware_setup() KVM: VMX: read the PML log in the same order as it was written KVM: VMX: refactor PML terminology KVM: VMX: Fix comment of handle_vmx_instruction() KVM: VMX: Reinstate __exit attribute for vmx_exit() KVM: SVM: Use str_enabled_disabled() helper in sev_hardware_setup() KVM: x86: Avoid double RDPKRU when loading host/guest PKRU KVM: x86: Use LVT_TIMER instead of an open coded literal RISC-V: KVM: Add new exit statstics for redirected traps RISC-V: KVM: Update firmware counters for various events RISC-V: KVM: Redirect instruction access fault trap to guest ... 
Pull kvm updates from Paolo Bonzini:
 "Loongarch:

   - Clear LLBCTL if secondary mmu mapping changes

   - Add hypercall service support for usermode VMM

  x86:

   - Add a comment to kvm_mmu_do_page_fault() to explain why KVM
     performs a direct call to kvm_tdp_page_fault() when RETPOLINE is
     enabled

   - Ensure that all SEV code is compiled out when disabled in Kconfig,
     even if building with less brilliant compilers

   - Remove a redundant TLB flush on AMD processors when guest CR4.PGE
     changes

   - Use str_enabled_disabled() to replace open coded strings

   - Drop kvm_x86_ops.hwapic_irr_update() as KVM updates hardware's
     APICv cache prior to every VM-Enter

   - Overhaul KVM's CPUID feature infrastructure to track all vCPU
     capabilities instead of just those where KVM needs to manage state
     and/or explicitly enable the feature in hardware. Along the way,
     refactor the code to make it easier to add features, and to make it
     more self-documenting how KVM is handling each feature

   - Rework KVM's handling of VM-Exits during event vectoring; this
     plugs holes where KVM unintentionally puts the vCPU into infinite
     loops in some scenarios (e.g. if emulation is triggered by the
     exit), and brings parity between VMX and SVM

   - Add pending request and interrupt injection information to the
     kvm_exit and kvm_entry tracepoints respectively

   - Fix a relatively benign flaw where KVM would end up redoing RDPKRU
     when loading guest/host PKRU, due to a refactoring of the kernel
     helpers that didn't account for KVM's pre-checking of the need to
     do WRPKRU

   - Make the completion of hypercalls go through the complete_hypercall
     function pointer argument, no matter if the hypercall exits to
     userspace or not.

     Previously, the code assumed that KVM_HC_MAP_GPA_RANGE specifically
     went to userspace, and all the others did not; the new code need
     not special case KVM_HC_MAP_GPA_RANGE and in fact does not care at
     all whether there was an exit to userspace or not

   - As part of enabling TDX virtual machines, support support
     separation of private/shared EPT into separate roots.

     When TDX will be enabled, operations on private pages will need to
     go through the privileged TDX Module via SEAMCALLs; as a result,
     they are limited and relatively slow compared to reading a PTE.

     The patches included in 6.14 allow KVM to keep a mirror of the
     private EPT in host memory, and define entries in kvm_x86_ops to
     operate on external page tables such as the TDX private EPT

   - The recently introduced conversion of the NX-page reclamation
     kthread to vhost_task moved the task under the main process. The
     task is created as soon as KVM_CREATE_VM was invoked and this, of
     course, broke userspace that didn't expect to see any child task of
     the VM process until it started creating its own userspace threads.

     In particular crosvm refuses to fork() if procfs shows any child
     task, so unbreak it by creating the task lazily. This is arguably a
     userspace bug, as there can be other kinds of legitimate worker
     tasks and they wouldn't impede fork(); but it's not like userspace
     has a way to distinguish kernel worker tasks right now. Should they
     show as "Kthread: 1" in proc/.../status?

  x86 - Intel:

   - Fix a bug where KVM updates hardware's APICv cache of the highest
     ISR bit while L2 is active, while ultimately results in a
     hardware-accelerated L1 EOI effectively being lost

   - Honor event priority when emulating Posted Interrupt delivery
     during nested VM-Enter by queueing KVM_REQ_EVENT instead of
     immediately handling the interrupt

   - Rework KVM's processing of the Page-Modification Logging buffer to
     reap entries in the same order they were created, i.e. to mark gfns
     dirty in the same order that hardware marked the page/PTE dirty

   - Misc cleanups

  Generic:

   - Cleanup and harden kvm_set_memory_region(); add proper lockdep
     assertions when setting memory regions and add a dedicated API for
     setting KVM-internal memory regions. The API can then explicitly
     disallow all flags for KVM-internal memory regions

   - Explicitly verify the target vCPU is online in kvm_get_vcpu() to
     fix a bug where KVM would return a pointer to a vCPU prior to it
     being fully online, and give kvm_for_each_vcpu() similar treatment
     to fix a similar flaw

   - Wait for a vCPU to come online prior to executing a vCPU ioctl, to
     fix a bug where userspace could coerce KVM into handling the ioctl
     on a vCPU that isn't yet onlined

   - Gracefully handle xarray insertion failures; even though such
     failures are impossible in practice after xa_reserve(), reserving
     an entry is always followed by xa_store() which does not know (or
     differentiate) whether there was an xa_reserve() before or not

  RISC-V:

   - Zabha, Svvptc, and Ziccrse extension support for guests. None of
     them require anything in KVM except for detecting them and marking
     them as supported; Zabha adds byte and halfword atomic operations,
     while the others are markers for specific operation of the TLB and
     of LL/SC instructions respectively

   - Virtualize SBI system suspend extension for Guest/VM

   - Support firmware counters which can be used by the guests to
     collect statistics about traps that occur in the host

  Selftests:

   - Rework vcpu_get_reg() to return a value instead of using an
     out-param, and update all affected arch code accordingly

   - Convert the max_guest_memory_test into a more generic
     mmu_stress_test. The basic gist of the "conversion" is to have the
     test do mprotect() on guest memory while vCPUs are accessing said
     memory, e.g. to verify KVM and mmu_notifiers are working as
     intended

   - Play nice with treewrite builds of unsupported architectures, e.g.
     arm (32-bit), as KVM selftests' Makefile doesn't do anything to
     ensure the target architecture is actually one KVM selftests
     supports

   - Use the kernel's $(ARCH) definition instead of the target triple
     for arch specific directories, e.g. arm64 instead of aarch64,
     mainly so as not to be different from the rest of the kernel

   - Ensure that format strings for logging statements are checked by
     the compiler even when the logging statement itself is disabled

   - Attempt to whack the last LLC references/misses mole in the Intel
     PMU counters test by adding a data load and doing CLFLUSH{OPT} on
     the data instead of the code being executed. It seems that modern
     Intel CPUs have learned new code prefetching tricks that bypass the
     PMU counters

   - Fix a flaw in the Intel PMU counters test where it asserts that
     events are counting correctly without actually knowing what the
     events count given the underlying hardware; this can happen if
     Intel reuses a formerly microarchitecture-specific event encoding
     as an architectural event, as was the case for Top-Down Slots"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (151 commits)
  kvm: defer huge page recovery vhost task to later
  KVM: x86/mmu: Return RET_PF* instead of 1 in kvm_mmu_page_fault()
  KVM: Disallow all flags for KVM-internal memslots
  KVM: x86: Drop double-underscores from __kvm_set_memory_region()
  KVM: Add a dedicated API for setting KVM-internal memslots
  KVM: Assert slots_lock is held when setting memory regions
  KVM: Open code kvm_set_memory_region() into its sole caller (ioctl() API)
  LoongArch: KVM: Add hypercall service support for usermode VMM
  LoongArch: KVM: Clear LLBCTL if secondary mmu mapping is changed
  KVM: SVM: Use str_enabled_disabled() helper in svm_hardware_setup()
  KVM: VMX: read the PML log in the same order as it was written
  KVM: VMX: refactor PML terminology
  KVM: VMX: Fix comment of handle_vmx_instruction()
  KVM: VMX: Reinstate __exit attribute for vmx_exit()
  KVM: SVM: Use str_enabled_disabled() helper in sev_hardware_setup()
  KVM: x86: Avoid double RDPKRU when loading host/guest PKRU
  KVM: x86: Use LVT_TIMER instead of an open coded literal
  RISC-V: KVM: Add new exit statstics for redirected traps
  RISC-V: KVM: Update firmware counters for various events
  RISC-V: KVM: Redirect instruction access fault trap to guest
  ...
Merge tag 'hyperv-next-signed-20250123' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux 2025-01-25T17:22:55+00:00 Linus Torvalds torvalds@linux-foundation.org 2025-01-25T17:22:55+00:00 382e391365ca12d1e5a15f109ba8b4609d58db6b Pull hyperv updates from Wei Liu: - Introduce a new set of Hyper-V headers in include/hyperv and replace the old hyperv-tlfs.h with the new headers (Nuno Das Neves) - Fixes for the Hyper-V VTL mode (Roman Kisel) - Fixes for cpu mask usage in Hyper-V code (Michael Kelley) - Document the guest VM hibernation behaviour (Michael Kelley) - Miscellaneous fixes and cleanups (Jacob Pan, John Starks, Naman Jain) * tag 'hyperv-next-signed-20250123' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: Documentation: hyperv: Add overview of guest VM hibernation hyperv: Do not overlap the hvcall IO areas in hv_vtl_apicid_to_vp_id() hyperv: Do not overlap the hvcall IO areas in get_vtl() hyperv: Enable the hypercall output page for the VTL mode hv_balloon: Fallback to generic_online_page() for non-HV hot added mem Drivers: hv: vmbus: Log on missing offers if any Drivers: hv: vmbus: Wait for boot-time offers during boot and resume uio_hv_generic: Add a check for HV_NIC for send, receive buffers setup iommu/hyper-v: Don't assume cpu_possible_mask is dense Drivers: hv: Don't assume cpu_possible_mask is dense x86/hyperv: Don't assume cpu_possible_mask is dense hyperv: Remove the now unused hyperv-tlfs.h files hyperv: Switch from hyperv-tlfs.h to hyperv/hvhdk.h hyperv: Add new Hyper-V headers in include/hyperv hyperv: Clean up unnecessary #includes hyperv: Move hv_connection_id to hyperv-tlfs.h 
Pull hyperv updates from Wei Liu:

 - Introduce a new set of Hyper-V headers in include/hyperv and replace
   the old hyperv-tlfs.h with the new headers (Nuno Das Neves)

 - Fixes for the Hyper-V VTL mode (Roman Kisel)

 - Fixes for cpu mask usage in Hyper-V code (Michael Kelley)

 - Document the guest VM hibernation behaviour (Michael Kelley)

 - Miscellaneous fixes and cleanups (Jacob Pan, John Starks, Naman Jain)

* tag 'hyperv-next-signed-20250123' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
  Documentation: hyperv: Add overview of guest VM hibernation
  hyperv: Do not overlap the hvcall IO areas in hv_vtl_apicid_to_vp_id()
  hyperv: Do not overlap the hvcall IO areas in get_vtl()
  hyperv: Enable the hypercall output page for the VTL mode
  hv_balloon: Fallback to generic_online_page() for non-HV hot added mem
  Drivers: hv: vmbus: Log on missing offers if any
  Drivers: hv: vmbus: Wait for boot-time offers during boot and resume
  uio_hv_generic: Add a check for HV_NIC for send, receive buffers setup
  iommu/hyper-v: Don't assume cpu_possible_mask is dense
  Drivers: hv: Don't assume cpu_possible_mask is dense
  x86/hyperv: Don't assume cpu_possible_mask is dense
  hyperv: Remove the now unused hyperv-tlfs.h files
  hyperv: Switch from hyperv-tlfs.h to hyperv/hvhdk.h
  hyperv: Add new Hyper-V headers in include/hyperv
  hyperv: Clean up unnecessary #includes
  hyperv: Move hv_connection_id to hyperv-tlfs.h
Merge tag 'docs-6.14' of git://git.lwn.net/linux 2025-01-22T02:00:00+00:00 Linus Torvalds torvalds@linux-foundation.org 2025-01-22T02:00:00+00:00 d0f93ac2c384c40202cf393fa7e8a2cac7004ba1 Pull Documentation updates from Jonathan Corbet: - Quite a bit of Chinese and Spanish translation work - Clarifying that Git commit IDs >12chars are OK - A new nvme-multipath document - A reorganization of the admin-guide top-level page to make it readable - Clarification of the role of Acked-by and maintainer discretion on their acceptance - Some reorganization of debugging-oriented docs ... and typo fixes, documentation updates, etc as usual * tag 'docs-6.14' of git://git.lwn.net/linux: (50 commits) Documentation: Fix x86_64 UEFI outdated references to elilo Documentation/sysctl: Add timer_migration to kernel.rst docs/mm: Physical memory: Remove zone_t docs: submitting-patches: clarify that signers may use their discretion on tags docs: submitting-patches: clarify difference between Acked-by and Reviewed-by docs: submitting-patches: clarify Acked-by and introduce "# Suffix" Documentation: bug-hunting.rst: remove odd contact information docs/zh_CN: Add sak index Chinese translation doc: module: DEFAULT_SYMBOL_NAMESPACE must be defined before #includes doc: module: Fix documented type of namespace Documentation/kernel-parameters: Fix a reference to vga-softcursor.rst docs/zh_CN: Add landlock index Chinese translation Documentation: Fix typo localmodonfig -> localmodconfig overlayfs.rst: Fix and improve grammar docs/zh_CN: Add siphash index Chinese translation docs/zh_CN: Add security IMA-templates Chinese translation docs/zh_CN: Add security digsig Chinese translation Align git commit ID abbreviation guidelines and checks docs: process: submitting-patches: split canonical patch format section docs/zh_CN: Add security lsm Chinese translation ... 
Pull Documentation updates from Jonathan Corbet:

 - Quite a bit of Chinese and Spanish translation work

 - Clarifying that Git commit IDs >12chars are OK

 - A new nvme-multipath document

 - A reorganization of the admin-guide top-level page to make it
   readable

 - Clarification of the role of Acked-by and maintainer discretion on
   their acceptance

 - Some reorganization of debugging-oriented docs

... and typo fixes, documentation updates, etc as usual

* tag 'docs-6.14' of git://git.lwn.net/linux: (50 commits)
  Documentation: Fix x86_64 UEFI outdated references to elilo
  Documentation/sysctl: Add timer_migration to kernel.rst
  docs/mm: Physical memory: Remove zone_t
  docs: submitting-patches: clarify that signers may use their discretion on tags
  docs: submitting-patches: clarify difference between Acked-by and Reviewed-by
  docs: submitting-patches: clarify Acked-by and introduce "# Suffix"
  Documentation: bug-hunting.rst: remove odd contact information
  docs/zh_CN: Add sak index Chinese translation
  doc: module: DEFAULT_SYMBOL_NAMESPACE must be defined before #includes
  doc: module: Fix documented type of namespace
  Documentation/kernel-parameters: Fix a reference to vga-softcursor.rst
  docs/zh_CN: Add landlock index Chinese translation
  Documentation: Fix typo localmodonfig -> localmodconfig
  overlayfs.rst: Fix and improve grammar
  docs/zh_CN: Add siphash index Chinese translation
  docs/zh_CN: Add security IMA-templates Chinese translation
  docs/zh_CN: Add security digsig Chinese translation
  Align git commit ID abbreviation guidelines and checks
  docs: process: submitting-patches: split canonical patch format section
  docs/zh_CN: Add security lsm Chinese translation
  ...
Merge tag 'kvm-x86-misc-6.14' of https://github.com/kvm-x86/linux into HEAD 2025-01-20T11:49:39+00:00 Paolo Bonzini pbonzini@redhat.com 2025-01-20T11:49:39+00:00 4f7ff70c0599bd4b90fef787045901b394655f06 KVM x86 misc changes for 6.14: - Overhaul KVM's CPUID feature infrastructure to track all vCPU capabilities instead of just those where KVM needs to manage state and/or explicitly enable the feature in hardware. Along the way, refactor the code to make it easier to add features, and to make it more self-documenting how KVM is handling each feature. - Rework KVM's handling of VM-Exits during event vectoring; this plugs holes where KVM unintentionally puts the vCPU into infinite loops in some scenarios (e.g. if emulation is triggered by the exit), and brings parity between VMX and SVM. - Add pending request and interrupt injection information to the kvm_exit and kvm_entry tracepoints respectively. - Fix a relatively benign flaw where KVM would end up redoing RDPKRU when loading guest/host PKRU, due to a refactoring of the kernel helpers that didn't account for KVM's pre-checking of the need to do WRPKRU. 
KVM x86 misc changes for 6.14:

 - Overhaul KVM's CPUID feature infrastructure to track all vCPU capabilities
   instead of just those where KVM needs to manage state and/or explicitly
   enable the feature in hardware.  Along the way, refactor the code to make
   it easier to add features, and to make it more self-documenting how KVM
   is handling each feature.

 - Rework KVM's handling of VM-Exits during event vectoring; this plugs holes
   where KVM unintentionally puts the vCPU into infinite loops in some scenarios
   (e.g. if emulation is triggered by the exit), and brings parity between VMX
   and SVM.

 - Add pending request and interrupt injection information to the kvm_exit and
   kvm_entry tracepoints respectively.

 - Fix a relatively benign flaw where KVM would end up redoing RDPKRU when
   loading guest/host PKRU, due to a refactoring of the kernel helpers that
   didn't account for KVM's pre-checking of the need to do WRPKRU.
KVM: arm64: nv: Fix doc header layout for timers 2025-01-16T10:27:10+00:00 Marc Zyngier maz@kernel.org 2025-01-16T10:27:10+00:00 544786361d4b73905b05b9539c2bf401c533f0d6 Stephen reports that 'make htmldocs' spits out a warning ("Documentation/virt/kvm/devices/vcpu.rst:147: WARNING: Definition list ends without a blank line; unexpected unindent."). Fix it by keeping all the timer attributes on a single line. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Marc Zyngier <maz@kernel.org> 
Stephen reports that 'make htmldocs' spits out a warning
("Documentation/virt/kvm/devices/vcpu.rst:147: WARNING: Definition
list ends without a blank line; unexpected unindent.").

Fix it by keeping all the timer attributes on a single line.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Documentation: hyperv: Add overview of guest VM hibernation 2025-01-13T19:17:59+00:00 Michael Kelley mhklinux@outlook.com 2025-01-13T14:56:45+00:00 2e03358be78b65d28b66e17aca9e0c8700b0df78 Add documentation on how hibernation works in a guest VM on Hyper-V. Describe how VMBus devices and the VMBus itself are hibernated and resumed, along with various limitations. Signed-off-by: Michael Kelley <mhklinux@outlook.com> Link: https://lore.kernel.org/r/20250113145645.1320942-1-mhklinux@outlook.com Signed-off-by: Wei Liu <wei.liu@kernel.org> Message-ID: <20250113145645.1320942-1-mhklinux@outlook.com> 
Add documentation on how hibernation works in a guest VM on Hyper-V.
Describe how VMBus devices and the VMBus itself are hibernated and
resumed, along with various limitations.

Signed-off-by: Michael Kelley <mhklinux@outlook.com>
Link: https://lore.kernel.org/r/20250113145645.1320942-1-mhklinux@outlook.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20250113145645.1320942-1-mhklinux@outlook.com>
KVM: s390: Reject KVM_SET_GSI_ROUTING on ucontrol VMs 2025-01-07T15:36:11+00:00 Christoph Schlameuss schlameuss@linux.ibm.com 2024-12-16T09:21:37+00:00 5021fd77d68fce28048b1af18c87bad6b7ffb282 Prevent null pointer dereference when processing KVM_IRQ_ROUTING_S390_ADAPTER routing entries. The ioctl cannot be processed for ucontrol VMs. Fixes: f65470661f36 ("KVM: s390/interrupt: do not pin adapter interrupt pages") Signed-off-by: Christoph Schlameuss <schlameuss@linux.ibm.com> Tested-by: Hariharan Mari <hari55@linux.ibm.com> Reviewed-by: Hariharan Mari <hari55@linux.ibm.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Link: https://lore.kernel.org/r/20241216092140.329196-4-schlameuss@linux.ibm.com Message-ID: <20241216092140.329196-4-schlameuss@linux.ibm.com> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com> 
Prevent null pointer dereference when processing
KVM_IRQ_ROUTING_S390_ADAPTER routing entries.
The ioctl cannot be processed for ucontrol VMs.

Fixes: f65470661f36 ("KVM: s390/interrupt: do not pin adapter interrupt pages")
Signed-off-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Tested-by: Hariharan Mari <hari55@linux.ibm.com>
Reviewed-by: Hariharan Mari <hari55@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20241216092140.329196-4-schlameuss@linux.ibm.com
Message-ID: <20241216092140.329196-4-schlameuss@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
KVM: s390: Reject setting flic pfault attributes on ucontrol VMs 2025-01-07T15:36:10+00:00 Christoph Schlameuss schlameuss@linux.ibm.com 2024-12-16T09:21:35+00:00 df989238fa46039393f0af5cfb93a863a233c061 Prevent null pointer dereference when processing the KVM_DEV_FLIC_APF_ENABLE and KVM_DEV_FLIC_APF_DISABLE_WAIT ioctls in the interrupt controller. Fixes: 3c038e6be0e2 ("KVM: async_pf: Async page fault support on s390") Reported-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Signed-off-by: Christoph Schlameuss <schlameuss@linux.ibm.com> Reviewed-by: Hariharan Mari <hari55@linux.ibm.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Link: https://lore.kernel.org/r/20241216092140.329196-2-schlameuss@linux.ibm.com Message-ID: <20241216092140.329196-2-schlameuss@linux.ibm.com> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com> 
Prevent null pointer dereference when processing the
KVM_DEV_FLIC_APF_ENABLE and KVM_DEV_FLIC_APF_DISABLE_WAIT ioctls in the
interrupt controller.

Fixes: 3c038e6be0e2 ("KVM: async_pf: Async page fault support on s390")
Reported-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Reviewed-by: Hariharan Mari <hari55@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20241216092140.329196-2-schlameuss@linux.ibm.com
Message-ID: <20241216092140.329196-2-schlameuss@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>