linux-kernel - Re: [PATCH -v2] x86: only load initrd above 4g on second try

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Date:	Tue, 2 Sep 2014 14:57:01 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Matt Fleming <matt.fleming@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>
Cc:	Mantas Mikulėnas <grawity@...il.com>,
	Anders Darander <anders@...rgestorm.se>,
	linux-efi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH -v2] x86: only load initrd above 4g on second try

On Tue, Sep 2, 2014 at 12:09 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> Mantas found that after commit 4bf7111f5016 ("x86/efi: Support initrd
> loaded above 4G"), the kernel freezes at the earliest possible moment
> when trying to boot via UEFI on Asus laptop.
>
> Revert to old way to load initrd under 4G on first try,
> second try will use above 4G buffer when initrd is too big
> and does not fit under 4G.
>
> -v2: add print out for second try, and print out files buf address.
>
> Reported-by: Mantas Mikulėnas <grawity@...il.com>
> Tested-by: Anders Darander <anders@...rgestorm.se>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>
> ---
>  arch/x86/boot/compressed/eboot.c               |   18 +++++++++++-------
>  drivers/firmware/efi/libstub/efi-stub-helper.c |    5 +++++
>  2 files changed, 16 insertions(+), 7 deletions(-)
>
> Index: linux-2.6/arch/x86/boot/compressed/eboot.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/boot/compressed/eboot.c
> +++ linux-2.6/arch/x86/boot/compressed/eboot.c
> @@ -1032,7 +1032,6 @@ struct boot_params *make_boot_params(str
>         int i;
>         unsigned long ramdisk_addr;
>         unsigned long ramdisk_size;
> -       unsigned long initrd_addr_max;
>
>         efi_early = c;
>         sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
> @@ -1095,15 +1094,20 @@ struct boot_params *make_boot_params(str
>
>         memset(sdt, 0, sizeof(*sdt));
>
> -       if (hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G)
> -               initrd_addr_max = -1UL;
> -       else
> -               initrd_addr_max = hdr->initrd_addr_max;
> -
>         status = handle_cmdline_files(sys_table, image,
>                                       (char *)(unsigned long)hdr->cmd_line_ptr,
> -                                     "initrd=", initrd_addr_max,
> +                                     "initrd=", hdr->initrd_addr_max,
>                                       &ramdisk_addr, &ramdisk_size);
> +
> +       if (status != EFI_SUCCESS &&
> +           hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
> +               efi_printk(sys_table, "Trying to load files to higher address\n");
> +               status = handle_cmdline_files(sys_table, image,
> +                                     (char *)(unsigned long)hdr->cmd_line_ptr,
> +                                     "initrd=", -1UL,
> +                                     &ramdisk_addr, &ramdisk_size);
> +       }
> +
>         if (status != EFI_SUCCESS)
>                 goto fail2;
>         hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
> Index: linux-2.6/drivers/firmware/efi/libstub/efi-stub-helper.c
> ===================================================================
> --- linux-2.6.orig/drivers/firmware/efi/libstub/efi-stub-helper.c
> +++ linux-2.6/drivers/firmware/efi/libstub/efi-stub-helper.c
> @@ -396,6 +396,7 @@ efi_status_t handle_cmdline_files(efi_sy
>
>         if (file_size_total) {
>                 unsigned long addr;
> +               char buf[64];
>
>                 /*
>                  * Multiple files need to be at consecutive addresses in memory,
> @@ -416,6 +417,10 @@ efi_status_t handle_cmdline_files(efi_sy
>                         goto free_file_total;
>                 }
>
> +               snprintf(buf, sizeof(buf), "files buf: [%lx,%lx)\n",
> +                                       file_addr, file_addr + file_size_total);

Sorry, Please ignore this version.

I only did make, but if fails with link.

drivers/firmware/efi/libstub/lib.a(efi-stub-helper.o): In function
`handle_cmdline_files':
efi-stub-helper.c:(.text+0xa16): undefined reference to `snprintf'



> +               efi_printk(sys_table_arg, buf);
> +
>                 addr = file_addr;
>                 for (j = 0; j < nr_files; j++) {
>                         unsigned long size;
--
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