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

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Message-ID: <BYAPR21MB168833D41D1214DE3892874CD76E9@BYAPR21MB1688.namprd21.prod.outlook.com>
Date:   Mon, 1 May 2023 16:57:56 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     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

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>