linux-kernel - Re: [RFC] arm64: kexec_file

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Message-ID: <20160711031044.GA2850@dhcp-128-65.nay.redhat.com>
Date:	Mon, 11 Jul 2016 11:10:44 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>
Cc:	AKASHI Takahiro <takahiro.akashi@...aro.org>,
	kexec@...ts.infradead.org, ebiederm@...ssion.com, bhe@...hat.com,
	vgoyal@...hat.com, will.deacon@....com, catalin.marinas@....com,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC] arm64: kexec_file_load support

On 07/08/16 at 11:48am, Thiago Jung Bauermann wrote:
> Am Donnerstag, 07 Juli 2016, 14:12:45 schrieb Dave Young:
> > If so maybe change a bit from your precious mentioned 7 args proposal like
> > below?
> > 
> > struct kexec_file_fd {
> > 	enum kexec_file_type;
> > 	int fd;
> > }
> > 
> > struct kexec_fdset {
> > 	int nr_fd;
> > 	struct kexec_file_fd fd[0];
> > }
> > 
> > int kexec_file_load(int kernel_fd, int initrd_fd,
> > 		    unsigned long cmdline_len, const char *cmdline_ptr,
> > 		    unsigned long flags, struct kexec_fdset *extra_fds);
> 
> 
> Is there a way for the kernel to distinguish whether the process passed 5 or 
> 6 arguments? How can it know whether extra_fds is a valid argument or just 
> garbage? I think we have to define a new flag KEXEC_FILE_EXTRA_FDS so that 
> the process can signal that it is using the new interface.

Agreed, a new flag is needed.

Thanks
Dave