Re: [PATCH v2 3/4] x86/paravirt: switch mixed paravirt/alternative calls to alternative_2

From: Ingo Molnar
Date: Wed Oct 18 2023 - 07:35:04 EST



* Juergen Gross <jgross@xxxxxxxx> wrote:

> On 16.10.23 16:29, Peter Zijlstra wrote:
> > On Mon, Oct 16, 2023 at 02:39:32PM +0200, Juergen Gross wrote:
> > > Instead of stacking alternative and paravirt patching, use the new
> > > ALT_FLAG_CALL flag to switch those mixed calls to pure alternative
> > > handling.
> > >
> > > This eliminates the need to be careful regarding the sequence of
> > > alternative and paravirt patching.
> > >
> > > For call depth tracking callthunks_setup() needs to be adapted to patch
> > > calls at alternative patching sites instead of paravirt calls.
> > >
> > > Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> >
> > I cannot help but feel this would've been better as two patches, one
> > introducing ALT_NOT_XEN and then a second with the rest.
>
> In case I need to respin I'll split it up.

Yeah, would be nice to split this patch into two, as Peter requested.

Thanks,

Ingo