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Message-ID: <4f5cc965-36da-43f0-aaaa-082a2235ec1e@suse.com>
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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