[PATCH v7 4/9] efi_loader: create default file boot option
Masahisa Kojima
masahisa.kojima at linaro.org
Mon Oct 16 15:00:56 CEST 2023
On Mon, 16 Oct 2023 at 21:46, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
>
> On 16.10.23 14:31, Ilias Apalodimas wrote:
> > Hi Heinrich,
> >
> > On Mon, 16 Oct 2023 at 10:06, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
> >>
> >>
> >>
> >> Am 16. Oktober 2023 08:45:21 MESZ schrieb Masahisa Kojima <masahisa.kojima at linaro.org>:
> >>> Current efibootmgr automatically creates the
> >>> boot options of all disks and partitions installing
> >>> EFI_SIMPLE_FILE_SYSTEM_PROTOCOL.
> >>> Some of the automatically created boot options are
> >>> useless if the disk and partition does not have
> >>> the default file(e.g. EFI/BOOT/BOOTAA64.EFI).
> >>>
> >>> This commit only creates the boot option if the disk and
> >>> partition have the default file so that system can directly
> >>> boot from it.
> >>
> >> I don't directly see the user benefit.
> >
> > The user can add an HTTP boot option now and the installer will
> > automatically start. That would allow products to ship with a single
> > boot option provisioned and run an installer on first boot
>
> This commit is not about HTTP. It changes how boot options for block
> devices are created.
>
> >
> >>
> >> Reading all file systems will increase the boot time. Shouldn't we avoid this?
> >
> > Any idea what would be an alternative? But when we added the
> > automatic boot options we said we should avoid dynamic scanning and
> > store results in a file. This is doing a similar thing. The only
> > difference is that it mounts the iso image before adding the boot
> > option.
>
> The alternative is to keep showing boot options for block devices even
> if there is no BOOTxxxx.EFI file.
>
> >
> >>
> >> What does EDK II do?
> >
> > No Idea :)
>
>
> On my workstation I get generated boot options
>
> Boot0001* UEFI:CD/DVD Drive BBS(129,,0x0)
> Boot0003* UEFI:Removable Device BBS(130,,0x0)
> Boot0004* UEFI:Network Device BBS(131,,0x0)
>
> without any media inserted and without any PXE server available.
It is just information about how the EDK2 works.
When I attach the Fedora installation media on EDK2(OVMF),
the automatically generated boot option is as follows.
UEFI QEMU HARDDISK QM00001 : PciRoot(0x0)/Pci(0x1,0x1)/Ata(Primary,Master,0x0)
When this boot option is selected, Fedora installer automatically starts.
So EDK II is searching the default file on the fly.
Thanks,
Masahisa Kojima
>
> Best regards
>
> Heinrich
>
> >
> > Thanks
> > /Ilias
> >>
> >> Does the UEFI specification warrant this change?
> >>
> >> Best regards
> >>
> >> Heinrich
> >>
> >>>
> >>> Signed-off-by: Masahisa Kojima <masahisa.kojima at linaro.org>
> >>> ---
> >>> lib/efi_loader/efi_bootmgr.c | 86 ++++++++++++++++++++++++++----------
> >>> 1 file changed, 63 insertions(+), 23 deletions(-)
> >>>
> >>> diff --git a/lib/efi_loader/efi_bootmgr.c b/lib/efi_loader/efi_bootmgr.c
> >>> index a40762c74c..c8cf1c5506 100644
> >>> --- a/lib/efi_loader/efi_bootmgr.c
> >>> +++ b/lib/efi_loader/efi_bootmgr.c
> >>> @@ -355,40 +355,70 @@ error:
> >>> */
> >>> static efi_status_t efi_bootmgr_enumerate_boot_option(struct eficonfig_media_boot_option *opt,
> >>> efi_handle_t *volume_handles,
> >>> - efi_status_t count)
> >>> + efi_uintn_t *count)
> >>> {
> >>> - u32 i;
> >>> + u32 i, num = 0;
> >>> struct efi_handler *handler;
> >>> efi_status_t ret = EFI_SUCCESS;
> >>>
> >>> - for (i = 0; i < count; i++) {
> >>> + for (i = 0; i < *count; i++) {
> >>> u16 *p;
> >>> u16 dev_name[BOOTMENU_DEVICE_NAME_MAX];
> >>> char *optional_data;
> >>> struct efi_load_option lo;
> >>> char buf[BOOTMENU_DEVICE_NAME_MAX];
> >>> - struct efi_device_path *device_path;
> >>> + struct efi_device_path *device_path, *full_path, *dp, *fp;
> >>> struct efi_device_path *short_dp;
> >>> + struct efi_file_handle *root, *f;
> >>> + struct efi_simple_file_system_protocol *file_system;
> >>> + u16 *default_file_path = NULL;
> >>>
> >>> - ret = efi_search_protocol(volume_handles[i], &efi_guid_device_path, &handler);
> >>> + ret = efi_search_protocol(volume_handles[i],
> >>> + &efi_guid_device_path, &handler);
> >>> if (ret != EFI_SUCCESS)
> >>> continue;
> >>> - ret = efi_protocol_open(handler, (void **)&device_path,
> >>> - efi_root, NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
> >>> +
> >>> + device_path = handler->protocol_interface;
> >>> + full_path = efi_dp_from_file(device_path,
> >>> + "/EFI/BOOT/" BOOTEFI_NAME);
> >>> +
> >>> + /* check whether the partition or disk have the default file */
> >>> + ret = efi_dp_split_file_path(full_path, &dp, &fp);
> >>> + if (ret != EFI_SUCCESS || !fp)
> >>> + goto next_entry;
> >>> +
> >>> + default_file_path = efi_dp_str(fp);
> >>> + if (!default_file_path)
> >>> + goto next_entry;
> >>> +
> >>> + ret = efi_search_protocol(volume_handles[i],
> >>> + &efi_simple_file_system_protocol_guid,
> >>> + &handler);
> >>> if (ret != EFI_SUCCESS)
> >>> - continue;
> >>> + goto next_entry;
> >>> +
> >>> + file_system = handler->protocol_interface;
> >>> + ret = EFI_CALL(file_system->open_volume(file_system, &root));
> >>> + if (ret != EFI_SUCCESS)
> >>> + goto next_entry;
> >>> +
> >>> + ret = EFI_CALL(root->open(root, &f, default_file_path,
> >>> + EFI_FILE_MODE_READ, 0));
> >>> + if (ret != EFI_SUCCESS)
> >>> + goto next_entry;
> >>> +
> >>> + EFI_CALL(f->close(f));
> >>>
> >>> ret = efi_disk_get_device_name(volume_handles[i], buf, BOOTMENU_DEVICE_NAME_MAX);
> >>> if (ret != EFI_SUCCESS)
> >>> - continue;
> >>> + goto next_entry;
> >>>
> >>> p = dev_name;
> >>> utf8_utf16_strncpy(&p, buf, strlen(buf));
> >>>
> >>> /* prefer to short form device path */
> >>> - short_dp = efi_dp_shorten(device_path);
> >>> - if (short_dp)
> >>> - device_path = short_dp;
> >>> + short_dp = efi_dp_shorten(full_path);
> >>> + device_path = short_dp ? short_dp : full_path;
> >>>
> >>> lo.label = dev_name;
> >>> lo.attributes = LOAD_OPTION_ACTIVE;
> >>> @@ -396,24 +426,35 @@ static efi_status_t efi_bootmgr_enumerate_boot_option(struct eficonfig_media_boo
> >>> lo.file_path_length = efi_dp_size(device_path) + sizeof(END);
> >>> /*
> >>> * Set the dedicated guid to optional_data, it is used to identify
> >>> - * the boot option that automatically generated by the bootmenu.
> >>> + * the boot option that automatically generated by the efibootmgr.
> >>> * efi_serialize_load_option() expects optional_data is null-terminated
> >>> * utf8 string, so set the "1234567" string to allocate enough space
> >>> * to store guid, instead of realloc the load_option.
> >>> */
> >>> lo.optional_data = "1234567";
> >>> - opt[i].size = efi_serialize_load_option(&lo, (u8 **)&opt[i].lo);
> >>> - if (!opt[i].size) {
> >>> - ret = EFI_OUT_OF_RESOURCES;
> >>> - goto out;
> >>> + opt[num].size = efi_serialize_load_option(&lo, (u8 **)&opt[num].lo);
> >>> + if (!opt[num].size) {
> >>> + efi_free_pool(full_path);
> >>> + efi_free_pool(dp);
> >>> + efi_free_pool(fp);
> >>> + efi_free_pool(default_file_path);
> >>> + return EFI_OUT_OF_RESOURCES;
> >>> }
> >>> /* set the guid */
> >>> - optional_data = (char *)opt[i].lo + (opt[i].size - u16_strsize(u"1234567"));
> >>> + optional_data = (char *)opt[num].lo + (opt[num].size - u16_strsize(u"1234567"));
> >>> memcpy(optional_data, &efi_guid_bootmenu_auto_generated, sizeof(efi_guid_t));
> >>> + num++;
> >>> +
> >>> +next_entry:
> >>> + efi_free_pool(full_path);
> >>> + efi_free_pool(dp);
> >>> + efi_free_pool(fp);
> >>> + efi_free_pool(default_file_path);
> >>> }
> >>>
> >>> -out:
> >>> - return ret;
> >>> + *count = num;
> >>> +
> >>> + return EFI_SUCCESS;
> >>> }
> >>>
> >>> /**
> >>> @@ -642,7 +683,7 @@ efi_status_t efi_bootmgr_delete_boot_option(u16 boot_index)
> >>> * efi_bootmgr_update_media_device_boot_option() - generate the media device boot option
> >>> *
> >>> * This function enumerates all devices supporting EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
> >>> - * and generate the bootmenu entries.
> >>> + * and create the boot option with default file if the file exists.
> >>> * This function also provide the BOOT#### variable maintenance for
> >>> * the media device entries.
> >>> * - Automatically create the BOOT#### variable for the newly detected device,
> >>> @@ -674,8 +715,7 @@ efi_status_t efi_bootmgr_update_media_device_boot_option(void)
> >>> goto out;
> >>> }
> >>>
> >>> - /* enumerate all devices supporting EFI_SIMPLE_FILE_SYSTEM_PROTOCOL */
> >>> - ret = efi_bootmgr_enumerate_boot_option(opt, volume_handles, count);
> >>> + ret = efi_bootmgr_enumerate_boot_option(opt, volume_handles, &count);
> >>> if (ret != EFI_SUCCESS)
> >>> goto out;
> >>>
>
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