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

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Date:   Mon, 16 Oct 2023 16:40:42 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     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

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.

> 
> Regardless,
> 
> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Thanks,


Juergen

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