linux-kernel - Re: [tip:x86/boot] x86/boot: Early parse RSDP and save it in boot

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Date:   Mon, 11 Feb 2019 21:03:05 +0800
From:   Chao Fan <fanc.fnst@...fujitsu.com>
To:     Borislav Petkov <bp@...en8.de>
CC:     Guenter Roeck <linux@...ck-us.net>, <tglx@...utronix.de>,
        <linux-kernel@...r.kernel.org>, <kirill.shutemov@...ux.intel.com>,
        <mingo@...hat.com>, <thomas.lendacky@....com>,
        <yamada.masahiro@...ionext.com>, <caoj.fnst@...fujitsu.com>,
        <jgross@...e.com>, <mingo@...nel.org>, <keescook@...omium.org>,
        <x86@...nel.org>, <hpa@...or.com>,
        <linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/boot] x86/boot: Early parse RSDP and save it in
 boot_params

On Mon, Feb 11, 2019 at 11:08:00AM +0100, Borislav Petkov wrote:
>On Mon, Feb 11, 2019 at 05:30:33PM +0800, Chao Fan wrote:
>> Yes, I download your ovmf file in linux-build-test/rootfs/firmware/ from
>> your link. There are two files, efi32 and efi64. Then I try to run:
>
>You need both OVMF-pure-efi-32.fd and rootfs.squashfs from the repo. And
>then this works here. Just put the script below and the two files in a
>directory and point to the kernel where you're building with -kernel.
>
>---
>#!/bin/bash
>
>qemu-system-x86_64 -kernel ~/kernel/linux/arch/x86/boot/bzImage -M q35 -cpu SandyBridge \
>        -no-reboot -snapshot -smp 1 \
>        -gdb tcp::1235 \
>        -bios OVMF-pure-efi-32.fd \
>        -m 1G \
>        -net nic,model=rtl8139,macaddr=12:34:56:78:12:34 \
>        -usb -device usb-storage,drive=d0 \
>        -drive file=rootfs.squashfs,if=none,id=d0,format=raw \
>        --append 'earlycon=uart8250,io,0x3f8,9600n8 root=/dev/sda rootwait panic=-1 earlyprintk=ttyS0,115200,keep console=ttyS0,115200' \
>        -monitor pty \
>        -serial file:log
>
>I've added some options for debugging.

So many thanks!
Since I learn much about how to debug kernel code before
start_kernel(). I only tried to debug code after start_kernel().
Seems you can debug the code in compressed code.

Thanks,
Chao Fan
>
>-- 
>Regards/Gruss,
>    Boris.
>
>SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
>
>