[PATCH v2 0/3] KVM: nVMX: Don't clobber VM-Entry instruction length on soft INTn exits

[ma . mandourr]

From: Mahmoud Abumandour <ma.mandourr@xxxxxxxxx>

KVM writes the length of a soft INTn that L2 was vectoring at the time of a
nested VM-Exit into vmcs12's VM-Entrty instruction length instead of the VM-Exit
instruction length.

Patch 1 did not exist in v1, but Sashiko pointed out that prepare_vmcs12()
overwrites the VM-exit instruction length that vmcs12_save_pending_event() saves
for soft events.

The selftest patch was written with the help of an LLM (Claude Opus 5.5).

v2:
 - New Patch 1
 - Same Patch 2 from v1 (with commit message changes)
 - Patch 3 now extends nested_exceptions_test instead of adding a new test
   (suggested by Sashiko).

v1: https://lore.kernel.org/all/20261021042603.608292-1-ma.mandourr@xxxxxxxxx

Mahmoud Abumandour (3):
  KVM: nVMX: Fill VM-Exit instruction length before saving pending event
  KVM: nVMX: Don't clobber VM-Entry instruction length when saving soft
    INTn
  KVM: selftests: Verify nested VM-Exits while vectoring INT3 and INTn

 arch/x86/kvm/vmx/nested.c                     |  6 ++-
 .../kvm/x86/nested_exceptions_test.c          | 39 +++++++++++++++++++
 2 files changed, 43 insertions(+), 2 deletions(-)

-- 
2.43.0