Merge tag 'x86-urgent-2026-03-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipHEADmaster

Pull x86 fixes from Ingo Molnar:

 - Fix SEV guest boot failures in certain circumstances, due to
   very early code relying on a BSS-zeroed variable that isn't
   actually zeroed yet an may contain non-zero bootup values

   Move the variable into the .data section go gain even earlier
   zeroing

 - Expose & allow the IBPB-on-Entry feature on SNP guests, which
   was not properly exposed to guests due to initial implementational
   caution

 - Fix O= build failure when CONFIG_EFI_SBAT_FILE is using relative
   file paths

 - Fix the various SNC (Sub-NUMA Clustering) topology enumeration
   bugs/artifacts (sched-domain build errors mostly).

   SNC enumeration data got more complicated with Granite Rapids X
   (GNR) and Clearwater Forest X (CWF), which exposed these bugs
   and made their effects more serious

 - Also use the now sane(r) SNC code to fix resctrl SNC detection bugs

 - Work around a historic libgcc unwinder bug in the vdso32 sigreturn
   code (again), which regressed during an overly aggressive recent
   cleanup of DWARF annotations

* tag 'x86-urgent-2026-03-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/entry/vdso32: Work around libgcc unwinder bug
  x86/resctrl: Fix SNC detection
  x86/topo: Fix SNC topology mess
  x86/topo: Replace x86_has_numa_in_package
  x86/topo: Add topology_num_nodes_per_package()
  x86/numa: Store extra copy of numa_nodes_parsed
  x86/boot: Handle relative CONFIG_EFI_SBAT_FILE file paths
  x86/sev: Allow IBPB-on-Entry feature for SNP guests
  x86/boot/sev: Move SEV decompressor variables into the .data section

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