Pull power management fixes from Rafael Wysocki:
 "These fix the cpupower utility installation, fix up the recently added
  Rust abstractions for cpufreq and OPP, restore the x86 update
  eliminating mwait_play_dead_cpuid_hint() that has been reverted during
  the 6.16 merge window along with preventing the failure caused by it
  from happening, and clean up mwait_idle_with_hints() usage in
  intel_idle:

   - Implement CpuId Rust abstraction and use it to fix doctest failure
     related to the recently introduced cpumask abstraction (Viresh
     Kumar)

   - Do minor cleanups in the `# Safety` sections for cpufreq
     abstractions added recently (Viresh Kumar)

   - Unbreak cpupower systemd service units installation on some systems
     by adding a unitdir variable for specifying the location to install
     them (Francesco Poli)

   - Eliminate mwait_play_dead_cpuid_hint() again after reverting its
     elimination during the 6.16 merge window due to a problem with
     handling "dead" SMT siblings, but this time prevent leaving them in
     C1 after initialization by taking them online and back offline when
     a proper cpuidle driver for the platform has been registered
     (Rafael Wysocki)

   - Update data types of variables passed as arguments to
     mwait_idle_with_hints() to match the function definition after
     recent changes (Uros Bizjak)"

* tag 'pm-6.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  rust: cpu: Add CpuId::current() to retrieve current CPU ID
  rust: Use CpuId in place of raw CPU numbers
  rust: cpu: Introduce CpuId abstraction
  intel_idle: Update arguments of mwait_idle_with_hints()
  cpufreq: Convert `/// SAFETY` lines to `# Safety` sections
  cpupower: split unitdir from libdir in Makefile
  Reapply "x86/smp: Eliminate mwait_play_dead_cpuid_hint()"
  ACPI: processor: Rescan "dead" SMT siblings during initialization
  intel_idle: Rescan "dead" SMT siblings during initialization
  x86/smp: PM/hibernate: Split arch_resume_nosmt()
  intel_idle: Use subsys_initcall_sync() for initialization

Merge cpuidle updates for 6.16-rc2:

 - Update data types of variables passed as arguments to
   mwait_idle_with_hints() to match the function definition
   after recent changes (Uros Bizjak).

 - Eliminate mwait_play_dead_cpuid_hint() again after reverting its
   elimination during the merge window due to a problem with handling
   "dead" SMT siblings, but this time prevent leaving them in C1 after
   initialization by taking them online and back offline when a proper
   cpuidle driver for the platform has been registered (Rafael Wysocki).

* pm-cpuidle:
  intel_idle: Update arguments of mwait_idle_with_hints()
  Reapply "x86/smp: Eliminate mwait_play_dead_cpuid_hint()"
  ACPI: processor: Rescan "dead" SMT siblings during initialization
  intel_idle: Rescan "dead" SMT siblings during initialization
  x86/smp: PM/hibernate: Split arch_resume_nosmt()
  intel_idle: Use subsys_initcall_sync() for initialization

Pull kvm fixes from Paolo Bonzini:
 "ARM:

   - Rework of system register accessors for system registers that are
     directly writen to memory, so that sanitisation of the in-memory
     value happens at the correct time (after the read, or before the
     write). For convenience, RMW-style accessors are also provided.

   - Multiple fixes for the so-called "arch-timer-edge-cases' selftest,
     which was always broken.

  x86:

   - Make KVM_PRE_FAULT_MEMORY stricter for TDX, allowing userspace to
     pass only the "untouched" addresses and flipping the shared/private
     bit in the implementation.

   - Disable SEV-SNP support on initialization failure

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: x86/mmu: Reject direct bits in gpa passed to KVM_PRE_FAULT_MEMORY
  KVM: x86/mmu: Embed direct bits into gpa for KVM_PRE_FAULT_MEMORY
  KVM: SEV: Disable SEV-SNP support on initialization failure
  KVM: arm64: selftests: Determine effective counter width in arch_timer_edge_cases
  KVM: arm64: selftests: Fix xVAL init in arch_timer_edge_cases
  KVM: arm64: selftests: Fix thread migration in arch_timer_edge_cases
  KVM: arm64: selftests: Fix help text for arch_timer_edge_cases
  KVM: arm64: Make __vcpu_sys_reg() a pure rvalue operand
  KVM: arm64: Don't use __vcpu_sys_reg() to get the address of a sysreg
  KVM: arm64: Add RMW specific sysreg accessor
  KVM: arm64: Add assignment-specific sysreg accessor

Pull ARC fixes from Vineet Gupta:

 - arch_atomic64_cmpxchg relaxed variant [Jason]

 - use of inbuilt swap in stack unwinder  [Yu-Chun Lin]

 - use of __ASSEMBLER__ in kernel headers [Thomas Huth]

* tag 'arc-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: Replace __ASSEMBLY__ with __ASSEMBLER__ in the non-uapi headers
  ARC: Replace __ASSEMBLY__ with __ASSEMBLER__ in uapi headers
  ARC: unwind: Use built-in sort swap to reduce code size and improve performance
  ARC: atomics: Implement arch_atomic64_cmpxchg using _relaxed

Only let userspace pass the same addresses that were used in KVM_SET_USER_MEMORY_REGION
(or KVM_SET_USER_MEMORY_REGION2); gpas in the the upper half of the address space
are an implementation detail of TDX and KVM.

Extracted from a patch by Sean Christopherson <seanjc@google.com>.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Bug[*] reported for TDX case when enabling KVM_PRE_FAULT_MEMORY in QEMU.

It turns out that @gpa passed to kvm_mmu_do_page_fault() doesn't have
shared bit set when the memory attribute of it is shared, and it leads
to wrong root in tdp_mmu_get_root_for_fault().

Fix it by embedding the direct bits in the gpa that is passed to
kvm_tdp_map_page(), when the memory of the gpa is not private.

[*] https://lore.kernel.org/qemu-devel/4a757796-11c2-47f1-ae0d-335626e818fd@intel.com/

Reported-by: Xiaoyao Li <xiaoyao.li@intel.com>
Closes: https://lore.kernel.org/qemu-devel/4a757796-11c2-47f1-ae0d-335626e818fd@intel.com/
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Message-ID: <20250611001018.2179964-1-xiaoyao.li@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Make pte_swp_exclusive return bool instead of int.  This will better
reflect how pte_swp_exclusive is actually used in the code.

This fixes swap/swapoff problems on Alpha due pte_swp_exclusive not
returning correct values when _PAGE_SWP_EXCLUSIVE bit resides in upper
32-bits of PTE (like on alpha).

Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
Cc: Sam James <sam@gentoo.org>
Link: https://lore.kernel.org/lkml/20250218175735.19882-2-linmag7@gmail.com/
Link: https://lore.kernel.org/lkml/20250602041118.GA2675383@ZenIV/
[ Applied as the 'sed' script Al suggested   - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

During platform init, SNP initialization may fail for several reasons,
such as firmware command failures and incompatible versions. However,
the KVM capability may continue to advertise support for it.

The platform may have SNP enabled but if SNP_INIT fails then SNP is
not supported by KVM.

During KVM module initialization query the SNP platform status to obtain
the SNP initialization state and use it as an additional condition to
determine support for SEV-SNP.

Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Co-developed-by: Pratik R. Sampat <prsampat@amd.com>
Signed-off-by: Pratik R. Sampat <prsampat@amd.com>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Reviewed-by: Pavan Kumar Paluri <papaluri@amd.com>
Message-ID: <20250512221634.12045-1-Ashish.Kalra@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

KVM/arm64 fixes for 6.16, take #2

- Rework of system register accessors for system registers that are
  directly writen to memory, so that sanitisation of the in-memory
  value happens at the correct time (after the read, or before the
  write). For convenience, RMW-style accessors are also provided.

- Multiple fixes for the so-called "arch-timer-edge-cases' selftest,
  which was always broken.

The user space calls mmap() to map VAS window paste address
and the kernel returns the complete mapped page for each
window. So return -EINVAL if non-zero is passed for offset
parameter to mmap().

See Documentation/arch/powerpc/vas-api.rst for mmap()
restrictions.

Co-developed-by: Jonathan Greental <yonatan02greental@gmail.com>
Signed-off-by: Jonathan Greental <yonatan02greental@gmail.com>
Reported-by: Jonathan Greental <yonatan02greental@gmail.com>
Fixes: dda44eb29c23 ("powerpc/vas: Add VAS user space API")
Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250610021227.361980-2-maddy@linux.ibm.com