[PATCH v3 0/8] KVM: VMX: Harden against interpreting TDX vCPU as vcpu_vmx

[Sean Christopherson <seanjc@google.com>]

Move and rename "all" (read: everything I could find) common helpers out of
vmx.c and/or replace their vmx_ prefix with vt_, and then poison to_vmx() for
all common .c files to harden KVM against misinterpreting a TDX vCPU as a VMX
vCPU, i.e. consuming to_vmx() on a TDX vCPU.  Spotted when working through
the bus lock series.

v3:
 - Collect tags. [Kai, Xiaoyao, Binbin]
 - Move the poisoning to patch 1. [Xiaoyao]
 - s/Disallowing/Disallow. [Binbin, Kai]
 - s/vmx_needs_pi_wakeup/vt_needs_pi_wakeup. [Xiaoyao]

v2:
 - https://lore.kernel.org/all/20260826171246.777729-1-seanjc@google.com
 - Complete my train of though in patch 1's changelog. [Binbin]
 - Rename vmx_handle_exit_irqoff() => vt_handle_exit_irqoff. [Binbin, Sashiko]
 - Collect a review. [Binbin]
 - Move and rename everything I could find, using a dummy "struct vcpu_vmx_tdx"
   to allow relocating common inline helpers from vmx.h to common.h.

v1: https://lore.kernel.org/all/20260814161129.2177118-1-seanjc@google.com

Sean Christopherson (8):
  KVM: VMX: Disallow using to_vmx() in common VT code
  KVM: VMX: Move the shared "IRQs off" exit handler(s) to common code
  KVM: VMX: Move the shared NMI handler/trampoline to common code
  KVM: VMX: Rename posted interrupt prefixes from "vmx" to "vt"
  KVM: VMX: Rename EPT violation handler prefix from "vmx" to "vt"
  KVM: VMX: Use dummy pseudo-overlay struct for to_vt() and vt_to_vcpu()
  KVM: VMX: Move common VT getters/converters to common.h
  KVM: VMX: Rename common exit info getters prefixes from "vmx" to "vt"

 arch/x86/kvm/vmx/common.h      |  60 +++++++++++--
 arch/x86/kvm/vmx/main.c        |  92 ++++++++++++++++++-
 arch/x86/kvm/vmx/nested.c      |  36 ++++----
 arch/x86/kvm/vmx/posted_intr.c |  24 ++---
 arch/x86/kvm/vmx/posted_intr.h |   8 +-
 arch/x86/kvm/vmx/tdx.c         |  32 +++----
 arch/x86/kvm/vmx/vmx.c         | 155 ++++++++-------------------------
 arch/x86/kvm/vmx/vmx.h         |  37 --------
 arch/x86/kvm/vmx/x86_ops.h     |   1 -
 9 files changed, 229 insertions(+), 216 deletions(-)


base-commit: 76671054f9a1ff6abb976583cd8da37650acdc97
-- 
2.55.0.979.g7e5102b832-goog