Re: [PATCH 0/3] Unify IBRS virtualization

[Sean Christopherson]

On Thu, Mar 13, 2025, Yosry Ahmed wrote:
> On Fri, Feb 21, 2025 at 04:33:49PM +0000, Yosry Ahmed wrote:
> > To properly virtualize IBRS on Intel, an IBPB is executed on emulated
> > VM-exits to provide separate predictor modes for L1 and L2.
> > 
> > Similar handling is theoretically needed for AMD, unless IbrsSameMode is
> > enumerated by the CPU (which should be the case for most/all CPUs
> > anyway). For correctness and clarity, this series generalizes the
> > handling to apply for both Intel and AMD as needed.
> > 
> > I am not sure if this series would land through the kvm-x86 tree or the
> > tip/x86 tree.
> 
> Sean, any thoughts about this (or general feedback about this series)?

No feedback, I just you and Jim to get mitigation stuff right far more than I
trust myself :-)

I'm planning on grabbing this for 6.16.