linux-kernel - Re: [PATCH] xen: issue deprecation warning for 32-bit pv guest

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Date:   Fri, 25 Oct 2019 09:48:56 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, xen-devel@...ts.xenproject.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] xen: issue deprecation warning for 32-bit pv guest

On 10/25/19 3:38 AM, Juergen Gross wrote:
> Support for the kernel as Xen 32-bit PV guest will soon be removed.
> Issue a warning when booted as such.
>
> Signed-off-by: Juergen Gross <jgross@...e.com>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>

> ---
>  arch/x86/xen/enlighten_pv.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
> index 58f79ab32358..5bfea374a160 100644
> --- a/arch/x86/xen/enlighten_pv.c
> +++ b/arch/x86/xen/enlighten_pv.c
> @@ -117,6 +117,14 @@ static void __init xen_banner(void)
>  	printk(KERN_INFO "Xen version: %d.%d%s%s\n",
>  	       version >> 16, version & 0xffff, extra.extraversion,
>  	       xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
> +
> +#ifdef CONFIG_X86_32
> +	pr_warn("WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!\n"
> +		"Support for running as 32-bit PV-guest under Xen will soon be removed\n"
> +		"from the Linux kernel!\n"
> +		"Please use either a 64-bit kernel or switch to HVM or PVH mode!\n"
> +		"WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!\n");
> +#endif
>  }
>  
>  static void __init xen_pv_init_platform(void)