linux-kernel - Re: Boot failure due to: x86/boot: Save fields explicitly, zero out everything else

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Message-ID: <alpine.DEB.2.21.1908212047140.1983@nanos.tec.linutronix.de>
Date:   Wed, 21 Aug 2019 20:51:55 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     John Hubbard <jhubbard@...dia.com>
cc:     Neil MacLeod <neil@...cleod.com>, "H. Peter Anvin" <hpa@...or.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "x86@...nel.org" <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, gregkh@...uxfoundation.org
Subject: Re: Boot failure due to: x86/boot: Save fields explicitly, zero out
 everything else

On Wed, 21 Aug 2019, John Hubbard wrote:
> On 8/21/19 10:05 AM, Neil MacLeod wrote:
> static void sanitize_boot_params(struct boot_params *boot_params)
> {
> ...
> 		const struct boot_params_to_save to_save[] = {
> 			BOOT_PARAM_PRESERVE(screen_info),
> 			BOOT_PARAM_PRESERVE(apm_bios_info),
> 			BOOT_PARAM_PRESERVE(tboot_addr),
> 			BOOT_PARAM_PRESERVE(ist_info),
> 			BOOT_PARAM_PRESERVE(acpi_rsdp_addr),
> 			BOOT_PARAM_PRESERVE(hd0_info),
> 			BOOT_PARAM_PRESERVE(hd1_info),
> 			BOOT_PARAM_PRESERVE(sys_desc_table),
> 			BOOT_PARAM_PRESERVE(olpc_ofw_header),
> 			BOOT_PARAM_PRESERVE(efi_info),
> 			BOOT_PARAM_PRESERVE(alt_mem_k),
> 			BOOT_PARAM_PRESERVE(scratch),
> 			BOOT_PARAM_PRESERVE(e820_entries),
> 			BOOT_PARAM_PRESERVE(eddbuf_entries),
> 			BOOT_PARAM_PRESERVE(edd_mbr_sig_buf_entries),
> 			BOOT_PARAM_PRESERVE(edd_mbr_sig_buffer),
> 			BOOT_PARAM_PRESERVE(e820_table),
> 			BOOT_PARAM_PRESERVE(eddbuf),
> 		};

I think I spotted it:

-               boot_params->acpi_rsdp_addr = 0;

+ 			BOOT_PARAM_PRESERVE(acpi_rsdp_addr),

And it does not preserve 'hdr'

Grr. I surely was too tired when staring at this last time.

Thanks,

	tglx