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

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Message-ID: <5b9b4c36-c28b-1644-61fe-dbdfe3c4a1d2@nvidia.com>
Date:   Wed, 21 Aug 2019 11:54:41 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Thomas Gleixner <tglx@...utronix.de>
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 8/21/19 11:51 AM, Thomas Gleixner wrote:
> 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.
> 

ohhh man, that's embarrassing. Especially hdr, which was the center of
the whole thing...sigh. Patch coming shortly.


thanks,
-- 
John Hubbard
NVIDIA