Re: [PATCH v3 01/27] KVM: nSVM: Flush the TLB after forcefully leaving nested

[Jim Mattson]

On Wed, Oct 14, 2026 at 8:19 AM Yosry Ahmed <yosry@xxxxxxxxxx> wrote:
>
> On Wed, Oct 14, 2026 at 8:02 AM Jim Mattson <jmattson@xxxxxxxxxx> wrote:
> >
> > On Mon, Oct 12, 2026 at 4:36 PM Yosry Ahmed <yosry@xxxxxxxxxx> wrote:
> > >
> > > KVM flushes the TLB on nested VM-Enter and nested VM-Exit, but not when
> > > forcefully leaving nested. In this case, L2 TLB entries can leak into
> > > L1. Flush the TLB after forcefully exiting L2, similar to nested
> > > VM-Exits.
> > >
> > > Note that vmx_leave_nested() handles this correctly, as it reuses
> > > nested_vmx_vmexit(), which handles the necessary TLB flushes on an L2 ->
> > > L1 transition.
> >
> > Fixes: ???
>
> I figured it was too old to be meaningful (i.e. we'll backport to all
> active stable kernels anyway).
>
> But I think it should be:
>
> Fixes: c513f484c558 ("KVM: nSVM: leave guest mode when clearing EFER.SVME")

I concur.