KVM: SVM: Allow KVM_SET_NESTED_STATE to clear GIF when SVME==0

KVM: SVM: Allow KVM_SET_NESTED_STATE to clear GIF when SVME==0

GIF==0 together with EFER.SVME==0 is a valid architectural
state. Don't return -EINVAL for KVM_SET_NESTED_STATE when this
combination is specified.

Fixes: cc440cdad5b7 ("KVM: nSVM: implement KVM_GET_NESTED_STATE and KVM_SET_NESTED_STATE")
Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Yosry Ahmed <yosry.ahmed@linux.dev>
Signed-off-by: Yosry Ahmed <yosry.ahmed@linux.dev>
Link: https://patch.msgid.link/20251121204803.991707-2-yosry.ahmed@linux.dev
[sean: disallow KVM_STATE_NESTED_RUN_PENDING with SVME=0]
Signed-off-by: Sean Christopherson <seanjc@google.com>