Pull kvm fixes from Paolo Bonzini:
 "ARM:

   - Correctly clean the BSS to the PoC before allowing EL2 to access it
     on nVHE/hVHE/protected configurations

   - Propagate ownership of debug registers in protected mode after the
     rework that landed in 6.14-rc1

   - Stop pretending that we can run the protected mode without a GICv3
     being present on the host

   - Fix a use-after-free situation that can occur if a vcpu fails to
     initialise the NV shadow S2 MMU contexts

   - Always evaluate the need to arm a background timer for fully
     emulated guest timers

   - Fix the emulation of EL1 timers in the absence of FEAT_ECV

   - Correctly handle the EL2 virtual timer, specially when HCR_EL2.E2H==0

  s390:

   - move some of the guest page table (gmap) logic into KVM itself,
     inching towards the final goal of completely removing gmap from the
     non-kvm memory management code.

     As an initial set of cleanups, move some code from mm/gmap into kvm
     and start using __kvm_faultin_pfn() to fault-in pages as needed;
     but especially stop abusing page->index and page->lru to aid in the
     pgdesc conversion.

  x86:

   - Add missing check in the fix to defer starting the huge page
     recovery vhost_task

   - SRSO_USER_KERNEL_NO does not need SYNTHESIZED_F"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (31 commits)
  KVM: x86/mmu: Ensure NX huge page recovery thread is alive before waking
  KVM: remove kvm_arch_post_init_vm
  KVM: selftests: Fix spelling mistake "initally" -> "initially"
  kvm: x86: SRSO_USER_KERNEL_NO is not synthesized
  KVM: arm64: timer: Don't adjust the EL2 virtual timer offset
  KVM: arm64: timer: Correctly handle EL1 timer emulation when !FEAT_ECV
  KVM: arm64: timer: Always evaluate the need for a soft timer
  KVM: arm64: Fix nested S2 MMU structures reallocation
  KVM: arm64: Fail protected mode init if no vgic hardware is present
  KVM: arm64: Flush/sync debug state in protected mode
  KVM: s390: selftests: Streamline uc_skey test to issue iske after sske
  KVM: s390: remove the last user of page->index
  KVM: s390: move PGSTE softbits
  KVM: s390: remove useless page->index usage
  KVM: s390: move gmap_shadow_pgt_lookup() into kvm
  KVM: s390: stop using lists to keep track of used dat tables
  KVM: s390: stop using page->index for non-shadow gmaps
  KVM: s390: move some gmap shadowing functions away from mm/gmap.c
  KVM: s390: get rid of gmap_translate()
  KVM: s390: get rid of gmap_fault()
  ...

Pull execve fix from Kees Cook:
 "This is an alpha-specific fix, but since it touched ELF I was asked to
  carry it.

   - alpha/elf: Fix misc/setarch test of util-linux by removing 32bit
     support (Eric W. Biederman)"

* tag 'execve-v6.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  alpha/elf: Fix misc/setarch test of util-linux by removing 32bit support

Pull x86 fix from Ingo Molnar:
 "Fix a build regression on GCC 15 builds, caused by GCC changing the
  default C version that is overriden in the main Makefile but not in
  the x86 boot code Makefile"

* tag 'x86-urgent-2025-02-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/boot: Use '-std=gnu11' to fix build with GCC 15

The space separator was factored out from the multiple chip name prints,
but several irq_chip::irq_print_chip() callbacks still print a leading
space.  Remove the superfluous double spaces.

Fixes: 9d9f204bdf7243bf ("genirq/proc: Add missing space separator back")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/893f7e9646d8933cd6786d5a1ef3eb076d263768.1738764803.git.geert+renesas@glider.be

Pull xen fixes from Juergen Gross:
 "Three fixes for xen_hypercall_hvm() that was introduced in the 6.13
  cycle"

* tag 'for-linus-6.14-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  x86/xen: remove unneeded dummy push from xen_hypercall_hvm()
  x86/xen: add FRAME_END to xen_hypercall_hvm()
  x86/xen: fix xen_hypercall_hvm() to not clobber %rbx

Richard Henderson <richard.henderson@linaro.org> writes[1]:

> There was a Spec benchmark (I forget which) which was memory bound and ran
> twice as fast with 32-bit pointers.
>
> I copied the idea from DEC to the ELF abi, but never did all the other work
> to allow the toolchain to take advantage.
>
> Amusingly, a later Spec changed the benchmark data sets to not fit into a
> 32-bit address space, specifically because of this.
>
> I expect one could delete the ELF bit and personality and no one would
> notice. Not even the 10 remaining Alpha users.

In [2] it was pointed out that parts of setarch weren't working
properly on alpha because it has it's own SET_PERSONALITY
implementation.  In the discussion that followed Richard Henderson
pointed out that the 32bit pointer support for alpha was never
completed.

Fix this by removing alpha's 32bit pointer support.

As a bit of paranoia refuse to execute any alpha binaries that have
the EF_ALPHA_32BIT flag set.  Just in case someone somewhere has
binaries that try to use alpha's 32bit pointer support.

Link: https://lkml.kernel.org/r/CAFXwXrkgu=4Qn-v1PjnOR4SG0oUb9LSa0g6QXpBq4ttm52pJOQ@mail.gmail.com [1]
Link: https://lkml.kernel.org/r/20250103140148.370368-1-glaubitz@physik.fu-berlin.de [2]
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Link: https://lore.kernel.org/r/87y0zfs26i.fsf_-_@email.froward.int.ebiederm.org
Signed-off-by: Kees Cook <kees@kernel.org>

Stack alignment of the kernel in 64-bit mode is 8, not 16, so the
dummy push in xen_hypercall_hvm() for aligning the stack to 16 bytes
can be removed.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

xen_hypercall_hvm() is missing a FRAME_END at the end, add it.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202502030848.HTNTTuo9-lkp@intel.com/
Fixes: b4845bb63838 ("x86/xen: add central hypercall functions")
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

xen_hypercall_hvm(), which is used when running as a Xen PVH guest at
most only once during early boot, is clobbering %rbx. Depending on
whether the caller relies on %rbx to be preserved across the call or
not, this clobbering might result in an early crash of the system.

This can be avoided by using an already saved register instead of %rbx.

Fixes: b4845bb63838 ("x86/xen: add central hypercall functions")
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

When waking a VM's NX huge page recovery thread, ensure the thread is
actually alive before trying to wake it.  Now that the thread is spawned
on-demand during KVM_RUN, a VM without a recovery thread is reachable via
the related module params.

  BUG: kernel NULL pointer dereference, address: 0000000000000040
  #PF: supervisor read access in kernel mode
  #PF: error_code(0x0000) - not-present page
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
  RIP: 0010:vhost_task_wake+0x5/0x10
  Call Trace:
   <TASK>
   set_nx_huge_pages+0xcc/0x1e0 [kvm]
   param_attr_store+0x8a/0xd0
   module_attr_store+0x1a/0x30
   kernfs_fop_write_iter+0x12f/0x1e0
   vfs_write+0x233/0x3e0
   ksys_write+0x60/0xd0
   do_syscall_64+0x5b/0x160
   entry_SYSCALL_64_after_hwframe+0x4b/0x53
  RIP: 0033:0x7f3b52710104
   </TASK>
  Modules linked in: kvm_intel kvm
  CR2: 0000000000000040

Fixes: 931656b9e2ff ("kvm: defer huge page recovery vhost task to later")
Cc: stable@vger.kernel.org
Cc: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20250124234623.3609069-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>