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Re: [RFC 0/3] extend kexec_file_load system call

From Jeremy Kerr <jeremy.kerr@au1.ibm.com>
Newsgroups linux.kernel
Subject Re: [RFC 0/3] extend kexec_file_load system call
Date 2016-07-22 03:00 +0200
Message-ID <rXwYO-6Mu-5@gated-at.bofh.it> (permalink)
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Hi Thiago,

> So even if not ideal, the solution above is desirable for powerpc. We would 
> like to preserve the ability of allowing userspace to pass parameters to the 
> OS via the DTB, even if secure boot is enabled.
> 
> I would like to turn the above into a proposal:
> 
> Extend the syscall as shown in this RFC from Takahiro AKASHI, but instead of 
> accepting a complete DTB from userspace, the syscall accepts a DTB 
> containing only a /chosen node. If the DTB contains any other node, the 
> syscall fails with EINVAL. If the DTB contains any subnode in /chosen, or if 
> there's a compatible or device_type property in /chosen, the syscall fails 
> with EINVAL as well.

This works for me. We could even have it as just a DTB fragment that is
merged *at* the /chosen/ node of the kernel-device tree - so would not
contain a /chosen node itself, and it would be impossible to provide
nodes outside of /chosen. Either is fine.

Thanks!


Jeremy

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Thread

[RFC 0/3] extend kexec_file_load system call AKASHI Takahiro <takahiro.akashi@linaro.org> - 2016-07-12 03:40 +0200
  Re: [RFC 0/3] extend kexec_file_load system call ebiederm@xmission.com (Eric W. Biederman) - 2016-07-12 15:40 +0200
    Re: [RFC 0/3] extend kexec_file_load system call Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-07-12 16:00 +0200
      Re: [RFC 0/3] extend kexec_file_load system call Vivek Goyal <vgoyal@redhat.com> - 2016-07-12 16:10 +0200
        Re: [RFC 0/3] extend kexec_file_load system call Stewart Smith <stewart@linux.vnet.ibm.com> - 2016-07-13 01:50 +0200
          Re: [RFC 0/3] extend kexec_file_load system call Vivek Goyal <vgoyal@redhat.com> - 2016-07-13 15:30 +0200
    Re: [RFC 0/3] extend kexec_file_load system call Arnd Bergmann <arnd@arndb.de> - 2016-07-12 16:10 +0200
      Re: [RFC 0/3] extend kexec_file_load system call Vivek Goyal <vgoyal@redhat.com> - 2016-07-12 16:20 +0200
        Re: [RFC 0/3] extend kexec_file_load system call Arnd Bergmann <arnd@arndb.de> - 2016-07-12 16:30 +0200
          Re: [RFC 0/3] extend kexec_file_load system call Mark Rutland <mark.rutland@arm.com> - 2016-07-12 17:00 +0200
            Re: [RFC 0/3] extend kexec_file_load system call Dave Young <dyoung@redhat.com> - 2016-07-13 04:40 +0200
              Re: [RFC 0/3] extend kexec_file_load system call Arnd Bergmann <arnd@arndb.de> - 2016-07-13 10:10 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Stewart Smith <stewart@linux.vnet.ibm.com> - 2016-07-13 10:30 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Mark Rutland <mark.rutland@arm.com> - 2016-07-13 11:50 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Arnd Bergmann <arnd@arndb.de> - 2016-07-13 15:20 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-07-13 20:50 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Arnd Bergmann <arnd@arndb.de> - 2016-07-13 22:10 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-07-14 04:20 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Arnd Bergmann <arnd@arndb.de> - 2016-07-14 10:40 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-07-15 03:50 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Arnd Bergmann <arnd@arndb.de> - 2016-07-15 09:40 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Vivek Goyal <vgoyal@redhat.com> - 2016-07-15 15:30 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Mark Rutland <mark.rutland@arm.com> - 2016-07-15 15:40 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-07-15 17:30 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Mark Rutland <mark.rutland@arm.com> - 2016-07-15 17:50 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-15 15:50 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Arnd Bergmann <arnd@arndb.de> - 2016-07-15 22:30 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-07-15 23:10 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-07-22 02:20 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Jeremy Kerr <jeremy.kerr@au1.ibm.com> - 2016-07-22 03:00 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Michael Ellerman <michael@ellerman.id.au> - 2016-07-22 05:00 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-07-22 22:50 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-15 10:50 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Vivek Goyal <vgoyal@redhat.com> - 2016-07-15 15:10 +0200
              Re: [RFC 0/3] extend kexec_file_load system call Mark Rutland <mark.rutland@arm.com> - 2016-07-13 11:40 +0200
                Re: [RFC 0/3] extend kexec_file_load system call AKASHI Takahiro <takahiro.akashi@linaro.org> - 2016-07-13 19:40 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Mark Rutland <mark.rutland@arm.com> - 2016-07-13 20:10 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Arnd Bergmann <arnd@arndb.de> - 2016-07-13 22:00 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Mark Rutland <mark.rutland@arm.com> - 2016-07-14 14:50 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Dave Young <dyoung@redhat.com> - 2016-07-14 04:00 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Dave Young <dyoung@redhat.com> - 2016-07-14 04:00 +0200
    Re: [RFC 0/3] extend kexec_file_load system call Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-07-12 18:30 +0200
      Re: [RFC 0/3] extend kexec_file_load system call Petr Tesarik <ptesarik@suse.cz> - 2016-07-12 23:00 +0200
        Re: [RFC 0/3] extend kexec_file_load system call ebiederm@xmission.com (Eric W. Biederman) - 2016-07-12 23:40 +0200
          Re: [RFC 0/3] extend kexec_file_load system call ebiederm@xmission.com (Eric W. Biederman) - 2016-07-13 00:00 +0200
          Re: [RFC 0/3] extend kexec_file_load system call Petr Tesarik <ptesarik@suse.cz> - 2016-07-13 00:00 +0200
        Re: [RFC 0/3] extend kexec_file_load system call Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-13 00:20 +0200
          Re: [RFC 0/3] extend kexec_file_load system call Stewart Smith <stewart@linux.vnet.ibm.com> - 2016-07-13 07:10 +0200
            Re: [RFC 0/3] extend kexec_file_load system call Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-13 09:40 +0200
              Re: [RFC 0/3] extend kexec_file_load system call Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-07-13 09:50 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-13 10:20 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Stewart Smith <stewart@linux.vnet.ibm.com> - 2016-07-13 10:30 +0200
              Re: [RFC 0/3] extend kexec_file_load system call Stewart Smith <stewart@linux.vnet.ibm.com> - 2016-07-13 10:00 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-13 10:30 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Dave Young <dyoung@redhat.com> - 2016-07-13 10:40 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Petr Tesarik <ptesarik@suse.cz> - 2016-07-13 11:00 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Vivek Goyal <vgoyal@redhat.com> - 2016-07-13 15:10 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-13 19:50 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Vivek Goyal <vgoyal@redhat.com> - 2016-07-13 20:30 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Balbir Singh <bsingharora@gmail.com> - 2016-07-18 14:50 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Vivek Goyal <vgoyal@redhat.com> - 2016-07-18 15:30 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Vivek Goyal <vgoyal@redhat.com> - 2016-07-18 15:40 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Balbir Singh <bsingharora@gmail.com> - 2016-07-20 05:50 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-20 10:40 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Arnd Bergmann <arnd@arndb.de> - 2016-07-20 13:20 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-07-20 18:00 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Vivek Goyal <vgoyal@redhat.com> - 2016-07-20 14:50 +0200
                Re: [RFC 0/3] extend kexec_file_load system call Vivek Goyal <vgoyal@redhat.com> - 2016-07-20 14:30 +0200
        Re: [RFC 0/3] extend kexec_file_load system call Stewart Smith <stewart@linux.vnet.ibm.com> - 2016-07-13 01:50 +0200
          Re: [RFC 0/3] extend kexec_file_load system call Vivek Goyal <vgoyal@redhat.com> - 2016-07-13 15:30 +0200

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