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

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Message-ID: <ZS/C1HS/EEXTtVji@gmail.com>
Date:   Wed, 18 Oct 2023 13:34:44 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Juergen Gross <jgross@...e.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        virtualization@...ts.linux-foundation.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ajay Kaher <akaher@...are.com>,
        Alexey Makhalov <amakhalov@...are.com>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>
Subject: Re: [PATCH v2 3/4] x86/paravirt: switch mixed paravirt/alternative
 calls to alternative_2


* Juergen Gross <jgross@...e.com> 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@...e.com>
> > 
> > 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