linux-kernel - Re: [PATCH v4] x86/boot: Use efi_setup_data for searching RSDP on kexec-ed kernel

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Message-ID: <20190416094024.GE27892@zn.tnic>
Date:   Tue, 16 Apr 2019 11:40:25 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Junichi Nomura <j-nomura@...jp.nec.com>
Cc:     Dave Young <dyoung@...hat.com>,
        Chao Fan <fanc.fnst@...fujitsu.com>,
        Baoquan He <bhe@...hat.com>, Kairui Song <kasong@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] x86/boot: Use efi_setup_data for searching RSDP on
 kexec-ed kernel

On Mon, Apr 15, 2019 at 11:00:25PM +0000, Junichi Nomura wrote:
> I thought we should hang here instead of return so that we
> don't run into efi_get_rsdp_addr() in case of kexec.

Hanging that early without debug output is not very friendly to
debuggers, methinks.

> > +	ei = &boot_params->efi_info;
> > +	sig = (char *)&ei->efi_loader_signature;
> > +	if (strncmp(sig, EFI64_LOADER_SIGNATURE, 4)) {
> > +		debug_putstr("Wrong kexec EFI loader signature.\n");
> > +		return 0;
> > +	}
> 
> Same here.

Ditto.

You get the idea.

-- 
Regards/Gruss,
    Boris.

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