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

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Date:   Mon, 28 Oct 2019 01:46:43 -0700
From:   hpa@...or.com
To:     Juergen Gross <jgross@...e.com>, xen-devel@...ts.xenproject.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
CC:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH] xen: issue deprecation warning for 32-bit pv guest

On October 25, 2019 12:38:58 AM PDT, Juergen Gross <jgross@...e.com> 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>
>---
> 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)

And there was much rejoicing.

Yaay.
-- 
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