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From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: Lukas Wunner <lukas@wunner.de>
Cc: Ard Biesheuvel <ardb@kernel.org>,
	linux-efi <linux-efi@vger.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	Laszlo Ersek <lersek@redhat.com>,
	Leif Lindholm <leif@nuviainc.com>,
	Peter Jones <pjones@redhat.com>,
	Matthew Garrett <mjg59@google.com>,
	Alexander Graf <agraf@csgraf.de>,
	Ilias Apalodimas <ilias.apalodimas@linaro.org>,
	Heinrich Schuchardt <xypron.glpk@gmx.de>,
	Daniel Kiper <daniel.kiper@oracle.com>
Subject: Re: [PATCH 1/2] efi/libstub: add support for loading the initrd from a device path
Date: Sun, 9 Feb 2020 12:35:33 +0100	[thread overview]
Message-ID: <CAKv+Gu-aV4REfOUpn7Ap2G6Rza9QFzfPRYU9d5hXvsJozDQNHw@mail.gmail.com> (raw)
In-Reply-To: <20200209063907.fcwmwtiz2tjhjmol@wunner.de>

On Sun, 9 Feb 2020 at 07:50, Lukas Wunner <lukas@wunner.de> wrote:
>
> On Thu, Feb 06, 2020 at 02:03:51PM +0000, Ard Biesheuvel wrote:
> > --- a/drivers/firmware/efi/libstub/efistub.h
> > +++ b/drivers/firmware/efi/libstub/efistub.h
> > @@ -566,6 +566,14 @@ union efi_load_file_protocol {
> >       } mixed_mode;
> >  };
> >
> > +struct efi_vendor_dev_path {
> > +     u8              type;
> > +     u8              sub_type;
> > +     u16             length;
> > +     efi_guid_t      vendorguid;
> > +     u8              vendordata[];
> > +} __packed;
>
> In commit 46cd4b75cd0e ("efi: Add device path parser") I introduced a
> struct efi_dev_path with a union for the type-specific data.  Maybe
> you can make use of it instead of introducing a new type?
>

That would make sense, but how do you take the size then? Perhaps it
would be better to have a generic struct definition for the shared
fields, struct definitions for the different types that use the
generic type as the first fields, and a separate union that ties them
altogether for the parser.

>
> > --- a/drivers/firmware/efi/libstub/efi-stub-helper.c
> > +++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
> > @@ -323,3 +323,68 @@ void efi_char16_printk(efi_char16_t *str)
> >       efi_call_proto(efi_table_attr(efi_system_table(), con_out),
> >                      output_string, str);
> >  }
> > +
> > +static const struct {
> > +     struct efi_vendor_dev_path      vendor;
> > +     struct efi_generic_dev_path     end;
> > +} __packed initrd_devpath = {
>
> Nit:  Can we consistently stick to "dev_path" in lieu of "devpath"?
>

Sure.

WARNING: multiple messages have this Message-ID
From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: Lukas Wunner <lukas@wunner.de>
Cc: linux-efi <linux-efi@vger.kernel.org>,
	Alexander Graf <agraf@csgraf.de>,
	Heinrich Schuchardt <xypron.glpk@gmx.de>,
	Daniel Kiper <daniel.kiper@oracle.com>,
	Ilias Apalodimas <ilias.apalodimas@linaro.org>,
	Matthew Garrett <mjg59@google.com>,
	Peter Jones <pjones@redhat.com>,
	Leif Lindholm <leif@nuviainc.com>,
	Laszlo Ersek <lersek@redhat.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 1/2] efi/libstub: add support for loading the initrd from a device path
Date: Sun, 9 Feb 2020 12:35:33 +0100	[thread overview]
Message-ID: <CAKv+Gu-aV4REfOUpn7Ap2G6Rza9QFzfPRYU9d5hXvsJozDQNHw@mail.gmail.com> (raw)
In-Reply-To: <20200209063907.fcwmwtiz2tjhjmol@wunner.de>

On Sun, 9 Feb 2020 at 07:50, Lukas Wunner <lukas@wunner.de> wrote:
>
> On Thu, Feb 06, 2020 at 02:03:51PM +0000, Ard Biesheuvel wrote:
> > --- a/drivers/firmware/efi/libstub/efistub.h
> > +++ b/drivers/firmware/efi/libstub/efistub.h
> > @@ -566,6 +566,14 @@ union efi_load_file_protocol {
> >       } mixed_mode;
> >  };
> >
> > +struct efi_vendor_dev_path {
> > +     u8              type;
> > +     u8              sub_type;
> > +     u16             length;
> > +     efi_guid_t      vendorguid;
> > +     u8              vendordata[];
> > +} __packed;
>
> In commit 46cd4b75cd0e ("efi: Add device path parser") I introduced a
> struct efi_dev_path with a union for the type-specific data.  Maybe
> you can make use of it instead of introducing a new type?
>

That would make sense, but how do you take the size then? Perhaps it
would be better to have a generic struct definition for the shared
fields, struct definitions for the different types that use the
generic type as the first fields, and a separate union that ties them
altogether for the parser.

>
> > --- a/drivers/firmware/efi/libstub/efi-stub-helper.c
> > +++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
> > @@ -323,3 +323,68 @@ void efi_char16_printk(efi_char16_t *str)
> >       efi_call_proto(efi_table_attr(efi_system_table(), con_out),
> >                      output_string, str);
> >  }
> > +
> > +static const struct {
> > +     struct efi_vendor_dev_path      vendor;
> > +     struct efi_generic_dev_path     end;
> > +} __packed initrd_devpath = {
>
> Nit:  Can we consistently stick to "dev_path" in lieu of "devpath"?
>

Sure.

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  reply	other threads:[~2020-02-09 11:35 UTC|newest]

Thread overview: 77+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-06 14:03 [PATCH 0/2] arch-agnostic initrd loading method for EFI systems Ard Biesheuvel
2020-02-06 14:03 ` Ard Biesheuvel
2020-02-06 14:03 ` [PATCH 1/2] efi/libstub: add support for loading the initrd from a device path Ard Biesheuvel
2020-02-06 14:03   ` Ard Biesheuvel
2020-02-06 18:26   ` Heinrich Schuchardt
2020-02-06 18:26     ` Heinrich Schuchardt
2020-02-06 18:46     ` Ilias Apalodimas
2020-02-06 18:46       ` Ilias Apalodimas
2020-02-06 19:15       ` Heinrich Schuchardt
2020-02-06 19:15         ` Heinrich Schuchardt
2020-02-06 20:09         ` Ilias Apalodimas
2020-02-06 20:09           ` Ilias Apalodimas
2020-02-06 22:49           ` Heinrich Schuchardt
2020-02-06 22:49             ` Heinrich Schuchardt
2020-02-07  7:35             ` Ilias Apalodimas
2020-02-07  7:35               ` Ilias Apalodimas
2020-02-06 22:35     ` Ard Biesheuvel
2020-02-06 22:35       ` Ard Biesheuvel
2020-02-07  0:01       ` Heinrich Schuchardt
2020-02-07  0:01         ` Heinrich Schuchardt
2020-02-07  0:21         ` Ard Biesheuvel
2020-02-07  0:21           ` Ard Biesheuvel
2020-02-07  0:57           ` Heinrich Schuchardt
2020-02-07  0:57             ` Heinrich Schuchardt
2020-02-07  8:12             ` Ard Biesheuvel
2020-02-07  8:12               ` Ard Biesheuvel
2020-02-07 13:30               ` Heinrich Schuchardt
2020-02-07 13:30                 ` Heinrich Schuchardt
2020-02-07 13:58                 ` Ard Biesheuvel
2020-02-07 13:58                   ` Ard Biesheuvel
2020-02-07 14:18                   ` Alexander Graf
2020-02-07 14:18                     ` Alexander Graf
2020-02-07 15:30                     ` Ard Biesheuvel
2020-02-07 15:30                       ` Ard Biesheuvel
2020-02-07 15:35                     ` Heinrich Schuchardt
2020-02-07 15:35                       ` Heinrich Schuchardt
2020-02-07 11:09       ` Laszlo Ersek
2020-02-07 11:09         ` Laszlo Ersek
2020-02-07 11:03     ` Laszlo Ersek
2020-02-07 11:03       ` Laszlo Ersek
2020-02-07  9:48   ` Laszlo Ersek
2020-02-07  9:48     ` Laszlo Ersek
2020-02-07 12:36     ` Ard Biesheuvel
2020-02-07 12:36       ` Ard Biesheuvel
2020-02-10 14:26       ` Laszlo Ersek
2020-02-10 14:26         ` Laszlo Ersek
2020-02-09  6:39   ` Lukas Wunner
2020-02-09 11:35     ` Ard Biesheuvel [this message]
2020-02-09 11:35       ` Ard Biesheuvel
2020-02-06 14:03 ` [PATCH 2/2] efi/libstub: take noinitrd cmdline argument into account for devpath initrd Ard Biesheuvel
2020-02-06 14:03   ` Ard Biesheuvel
2020-02-06 18:33   ` Heinrich Schuchardt
2020-02-06 18:33     ` Heinrich Schuchardt
2020-02-06 23:44     ` Ard Biesheuvel
2020-02-06 23:44       ` Ard Biesheuvel
2020-02-12 16:01   ` Peter Jones
2020-02-12 16:01     ` Peter Jones
2020-02-07  9:09 ` [PATCH 0/2] arch-agnostic initrd loading method for EFI systems Laszlo Ersek
2020-02-07  9:09   ` Laszlo Ersek
2020-02-07  9:22   ` Laszlo Ersek
2020-02-07  9:22     ` Laszlo Ersek
2020-02-07 12:23     ` Ard Biesheuvel
2020-02-07 12:23       ` Ard Biesheuvel
2020-02-07 16:20       ` James Bottomley
2020-02-07 16:20         ` James Bottomley
2020-02-07 18:31         ` Ard Biesheuvel
2020-02-07 18:31           ` Ard Biesheuvel
2020-02-07 19:54           ` James Bottomley
2020-02-07 19:54             ` James Bottomley
2020-02-07 20:03             ` Ard Biesheuvel
2020-02-07 20:03               ` Ard Biesheuvel
2020-02-07 18:45 ` Arvind Sankar
2020-02-07 18:45   ` Arvind Sankar
2020-02-07 19:47   ` Ard Biesheuvel
2020-02-07 19:47     ` Ard Biesheuvel
2020-02-07 20:26     ` Arvind Sankar
2020-02-07 20:26       ` Arvind Sankar

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