[PATCH] x86: efi_loader: Ensure the SMBIOS tables are sent via EFI

[Simon Glass]

Hi Ilias,

On Fri, 11 Apr 2025 at 04:04, Ilias Apalodimas
<ilias.apalodimas at linaro.org> wrote:
>
> Hi Simon
>
> On Sat, 5 Apr 2025 at 23:46, Simon Glass <sjg at chromium.org> wrote:
> >
> > The EFI-loader code has not been fully converted to use bloblist, so
> > relies on the SMBIOS-table address being set in global_data.
>
> Can you explain a bit more what this means?

It means that the EFI-loader code is still using gd->arch.smbios_start
to find the SMBIOS table. At some point we should move it to use
bloblist_get_blob().

> The SMBIOS tables for EFI
> are supposed to be on EFI allocated memory

Not allocated by EFI, just added to the EFI memory map. See
efi_smbios_register(). We still want to support SMBIOS tables if not
booting with EFI.

>
> >
> > Set this up in write_tables() so that the SMBIOS tables are actually
> > available.
> >
> > Enable the command for x86 QEMU so that the SMBIOS tests actually run.
> >
> > Signed-off-by: Simon Glass <sjg at chromium.org>
> > Fixes: 83ce35d6ebb ("emulation: Use bloblist to hold tables")
> > Reported-by: Niklas Sombert <niklas.sombert at uni-duesseldorf.de>
> > ---
> >
> >  arch/x86/lib/tables.c            | 2 ++
> >  board/emulation/qemu-x86/Kconfig | 1 +
> >  lib/efi_loader/efi_smbios.c      | 1 +
> >  3 files changed, 4 insertions(+)
> >
> > diff --git a/arch/x86/lib/tables.c b/arch/x86/lib/tables.c
> > index ec52992209f..d7f183f95dc 100644
> > --- a/arch/x86/lib/tables.c
> > +++ b/arch/x86/lib/tables.c
> > @@ -126,6 +126,8 @@ int write_tables(void)
> >                         use_high = true;
> >                         if (!gd->arch.table_start_high)
> >                                 gd->arch.table_start_high = rom_addr;
> > +                       if (table->tag == BLOBLISTT_SMBIOS_TABLES)
> > +                               gd_set_smbios_start(rom_addr);
> >                 }
> >                 rom_table_end = table->write(rom_addr);
> >                 if (!rom_table_end) {
> > diff --git a/board/emulation/qemu-x86/Kconfig b/board/emulation/qemu-x86/Kconfig
> > index b2a4e0891a4..c1564fba7cd 100644
> > --- a/board/emulation/qemu-x86/Kconfig
> > +++ b/board/emulation/qemu-x86/Kconfig
> > @@ -23,5 +23,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
> >         imply VIRTIO_PCI
> >         imply VIRTIO_NET
> >         imply VIRTIO_BLK
> > +       imply CMD_SMBIOS
> >
> >  endif
> > diff --git a/lib/efi_loader/efi_smbios.c b/lib/efi_loader/efi_smbios.c
> > index 8d2ef6deb51..5275e966dfe 100644
> > --- a/lib/efi_loader/efi_smbios.c
> > +++ b/lib/efi_loader/efi_smbios.c
> > @@ -35,6 +35,7 @@ efi_status_t efi_smbios_register(void)
> >         void *buf;
> >
> >         addr = gd_smbios_start();
> > +       printf("register %lx\n", addr);
>
> I don't think this print is useful at all, why isn't the log_err()
> right below enough?

This was left in inadvertently and should be removed.

>
> >         if (!addr) {
> >                 log_err("No SMBIOS tables to install\n");
> >                 return EFI_NOT_FOUND;
> > --
> > 2.43.0
> >
>

Regards,
Simon