On Thu, Feb 27, 2025, Yosry Ahmed wrote: > Instead of using X86_FEATURE_USE_IBPB to guard the IBPB execution in KVM > when a new vCPU is loaded, introduce a static branch, similar to > switch_mm_*_ibpb. > > This makes it obvious in spectre_v2_user_select_mitigation() what > exactly is being toggled, instead of the unclear X86_FEATURE_USE_IBPB > (which will be shortly removed). It also provides more fine-grained > control, making it simpler to change/add paths that control the IBPB in > the vCPU switch path without affecting other IBPBs. > > Signed-off-by: Yosry Ahmed <yosry.ahmed@xxxxxxxxx> > Acked-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> > --- Acked-by: Sean Christopherson <seanjc@xxxxxxxxxx>
