[PATCH 0/4] KVM: x86: Fix WFS vs. pending SMI WARN

[Sean Christopherson <seanjc@google.com>]

Fix a user-triggerable WARN that syzkaller found by stuffing INIT_RECEIVED,
a.k.a. WFS, and then putting the vCPU into VMX Root Mode (post-VMXON).  Use
the same approach KVM uses for dealing with "impossible" emulation when
running a !URG guest, and simply wait until KVM_RUN to detect that the vCPU
has architecturally impossible state.

Sean Christopherson (4):
  KVM: x86: Drop pending_smi vs. INIT_RECEIVED check when setting
    MP_STATE
  KVM: x86: WARN and reject KVM_RUN if vCPU's MP_STATE is SIPI_RECEIVED
  KVM: x86: Move INIT_RECEIVED vs. INIT/SIPI blocked check to KVM_RUN
  KVM: x86: Refactor handling of SIPI_RECEIVED when setting MP_STATE

 arch/x86/kvm/x86.c | 49 ++++++++++++++++++++++++++++------------------
 1 file changed, 30 insertions(+), 19 deletions(-)


base-commit: 61374cc145f4a56377eaf87c7409a97ec7a34041
-- 
2.50.0.rc0.604.gd4ff7b7c86-goog