linux-kernel - Re: [PATCH v2 4/7] Revert "xen: Introduce 'xen_nopv' to disable PV extensions for HVM guests."

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Date:   Wed, 26 Jun 2019 15:48:28 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Juergen Gross <jgross@...e.com>
cc:     Zhenzhong Duan <zhenzhong.duan@...cle.com>,
        linux-kernel@...r.kernel.org, mingo@...nel.org, bp@...en8.de,
        hpa@...or.com, boris.ostrovsky@...cle.com, sstabellini@...nel.org,
        peterz@...radead.org, srinivas.eeda@...cle.com,
        Ingo Molnar <mingo@...hat.com>, xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v2 4/7] Revert "xen: Introduce 'xen_nopv' to disable PV
 extensions for HVM guests."

On Wed, 26 Jun 2019, Juergen Gross wrote:
> On 24.06.19 14:02, Zhenzhong Duan wrote:
> > This reverts commit 8d693b911bb9c57009c24cb1772d205b84c7985c.
> > 
> > Instead we use an unified parameter 'nopv' for all the hypervisor
> > platforms.
> > 
> > Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...cle.com>
> > Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> > Cc: Juergen Gross <jgross@...e.com>
> > Cc: Stefano Stabellini <sstabellini@...nel.org>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Cc: Ingo Molnar <mingo@...hat.com>
> > Cc: Borislav Petkov <bp@...en8.de>
> > Cc: xen-devel@...ts.xenproject.org
> 
> Reviewed-by: Juergen Gross <jgross@...e.com>

You're really sure that you want to break existing setups which might use
that already?

Command line parameters are ABI. You can map xen_nopv to the new shiny nopv
implementation but removing it?

Your decision, but you've been told :)

Thanks,

	tglx