KVM: x86: Forcibly leave nested if RSM to L2 hits shutdown

Leave nested mode before synthesizing shutdown (a.k.a. TRIPLE_FAULT) if
RSM fails when resuming L2 (a.k.a. guest mode).  Architecturally, shutdown
on RSM occurs _before_ the transition back to guest mode on both Intel and
AMD.

On Intel, per the SDM pseudocode, SMRAM state is loaded before critical
VMX state:

  restore state normally from SMRAM;
  ...
  CR4.VMXE := value stored internally;
  IF internal storage indicates that the logical processor had been in
     VMX operation (root or non-root)
  THEN
     enter VMX operation (root or non-root);
     restore VMX-critical state as defined in Section 32.14.1;
     ...
     restore current VMCS pointer;
  FI;

AMD's APM is both less clearcut and more explicit.  Because AMD CPUs save
VMCB and guest state in SMRAM itself, given the lack of anything in the
APM to indicate a shutdown in guest mode is possible, a straightforward
reading of the clause on invalid state is that _what_ state is invalid is
irrelevant, i.e. all roads lead to shutdown.

  An RSM causes a processor shutdown if an invalid-state condition is
  found in the SMRAM state-save area.

This fixes a bug found by syzkaller where synthesizing shutdown for L2
led to a nested VM-Exit (if L1 is intercepting shutdown), which in turn
caused KVM to complain about trying to cancel a nested VM-Enter (see
commit 759cbd59674a ("KVM: x86: nSVM/nVMX: set nested_run_pending on VM
entry which is a result of RSM").

Note, Paolo pointed out that KVM shouldn't set nested_run_pending until
after loading SMRAM state.  But as above, that's only half the story, KVM
shouldn't transition to guest mode either.  Unfortunately, fixing that
mess requires rewriting the nVMX and nSVM RSM flows to not piggyback
their nested VM-Enter flows, as executing the nested VM-Enter flows after
loading state from SMRAM would clobber much of said state.

For now, add a FIXME to call out that transitioning to guest mode before
loading state from SMRAM is wrong.

Link: https://lore.kernel.org/all/CABgObfYaUHXyRmsmg8UjRomnpQ0Jnaog9-L2gMjsjkqChjDYUQ@mail.gmail.com
Reported-by: syzbot+988d9efcdf137bc05f66@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/0000000000007a9acb06151e1670@google.com
Reported-by: Zheyu Ma <zheyuma97@gmail.com>
Closes: https://lore.kernel.org/all/CAMhUBjmXMYsEoVYw_M8hSZjBMHh24i88QYm-RY6HDta5YZ7Wgw@mail.gmail.com
Analyzed-by: Michal Wilczynski <michal.wilczynski@intel.com>
Cc: Kishen Maloor <kishen.maloor@intel.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Link: https://lore.kernel.org/r/20240906161337.1118412-1-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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