linux-kernel - Re: [PATCH] x86/hyperv/vtl: Add noop for realmode pointers

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Message-ID: <ZFknhiprxZUC5Bo7@liuwe-devbox-debian-v2>
Date:   Mon, 8 May 2023 16:47:02 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
Cc:     Saurabh Sengar <ssengar@...ux.microsoft.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        Saurabh Singh Sengar <ssengar@...rosoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
Subject: Re: [PATCH] x86/hyperv/vtl: Add noop for realmode pointers

On Mon, May 01, 2023 at 04:57:56PM +0000, Michael Kelley (LINUX) wrote:
> From: Saurabh Sengar <ssengar@...ux.microsoft.com> Sent: Monday, April 24, 2023 3:10 AM
> > 
> > Assign the realmode pointers to noop, instead of NULL to fix kernel panic.
> > 
> > Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
> > ---
> >  arch/x86/hyperv/hv_vtl.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c
> > index 1ba5d3b99b16..85d38b9f3586 100644
> > --- a/arch/x86/hyperv/hv_vtl.c
> > +++ b/arch/x86/hyperv/hv_vtl.c
> > @@ -20,6 +20,8 @@ void __init hv_vtl_init_platform(void)
> >  {
> >  	pr_info("Linux runs in Hyper-V Virtual Trust Level\n");
> > 
> > +	x86_platform.realmode_reserve = x86_init_noop;
> > +	x86_platform.realmode_init = x86_init_noop;
> >  	x86_init.irqs.pre_vector_init = x86_init_noop;
> >  	x86_init.timers.timer_init = x86_init_noop;
> > 
> > --
> > 2.34.1
> 
> Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
> 

Applied to hyperv-fixes. Thanks.