[PATCH v9 02/11] efi_loader: Add a test app
Simon Glass
sjg at chromium.org
Thu Oct 31 19:02:49 CET 2024
Hi,
On Wed, 30 Oct 2024 at 18:55, Ilias Apalodimas
<ilias.apalodimas at linaro.org> wrote:
>
> Hi Heinrich
>
>
>
> On Wed, 30 Oct 2024 at 18:55, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
> >
> > On 10/29/24 20:22, Simon Glass wrote:
> > > Add a simple app to use for testing. This is intended to do whatever it
> > > needs to for testing purposes. For now it just prints a message and
> > > exits boot services.
> > >
> > > There was a considerable amount of discussion about whether it is OK to
> > > call exit-boot-services and then return to U-Boot. This is not normally
> > > done in a real application, since exit-boot-services is used to
> > > completely disconnect from U-Boot. However, since this is a test, we
> > > need to check the results of running the app, so returning is necessary.
> > > It works correctly and it provides a nice model of how to test the EFI
> > > code in a simple way.
> > >
> > > Signed-off-by: Simon Glass <sjg at chromium.org>
> > > ---
> > >
> > > Changes in v9:
> > > - Update license
> > > - Fix 'sevices' typo
> > >
> > > Changes in v7:
> > > - Update commit message
> > >
> > > lib/efi_loader/Kconfig | 10 ++++++
> > > lib/efi_loader/Makefile | 1 +
> > > lib/efi_loader/testapp.c | 68 ++++++++++++++++++++++++++++++++++++++++
> > > 3 files changed, 79 insertions(+)
> > > create mode 100644 lib/efi_loader/testapp.c
> > >
> > > diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
> > > index 37572c82f54..44319729bda 100644
> > > --- a/lib/efi_loader/Kconfig
> > > +++ b/lib/efi_loader/Kconfig
> > > @@ -584,6 +584,16 @@ config BOOTEFI_HELLO_COMPILE
> > > No additional space will be required in the resulting U-Boot binary
> > > when this option is enabled.
> > >
> > > +config BOOTEFI_TESTAPP_COMPILE
> > > + bool "Compile an EFI test app for testing"
> > > + default y
> > > + help
> > > + This compiles an app designed for testing. It is packed into an image
> > > + by the test.py testing frame in the setup_efi_image() function.
> > > +
> > > + No additional space will be required in the resulting U-Boot binary
> > > + when this option is enabled.
> > > +
> > > endif
> > >
> > > source "lib/efi/Kconfig"
> > > diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
> > > index 8ec240cb864..7c8b2dd1ad6 100644
> > > --- a/lib/efi_loader/Makefile
> > > +++ b/lib/efi_loader/Makefile
> > > @@ -20,6 +20,7 @@ apps-$(CONFIG_EFI_LOAD_FILE2_INITRD) += initrddump
> > > ifeq ($(CONFIG_GENERATE_ACPI_TABLE),)
> > > apps-y += dtbdump
> > > endif
> > > +apps-$(CONFIG_BOOTEFI_TESTAPP_COMPILE) += testapp
> > >
> > > obj-$(CONFIG_CMD_BOOTEFI_HELLO) += helloworld_efi.o
> > > obj-$(CONFIG_EFI_BOOTMGR) += efi_bootmgr.o
> > > diff --git a/lib/efi_loader/testapp.c b/lib/efi_loader/testapp.c
> > > new file mode 100644
> > > index 00000000000..a28fc17ce5b
> > > --- /dev/null
> > > +++ b/lib/efi_loader/testapp.c
> > > @@ -0,0 +1,68 @@
> > > +// SPDX-License-Identifier: GPL-2.0-or-later
> > > +/*
> > > + * Hello world EFI application
> > > + *
> > > + * Copyright 2024 Google LLC
> > > + * Written by Simon Glass <sjg at chromium.org>
> > > + *
> > > + * This test program is used to test the invocation of an EFI application.
> > > + * It writes a few messages to the console and then exits boot services
> > > + */
> > > +
> > > +#include <efi_api.h>
> > > +
> > > +static const efi_guid_t loaded_image_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
> > > +
> > > +static struct efi_system_table *systable;
> > > +static struct efi_boot_services *boottime;
> > > +static struct efi_simple_text_output_protocol *con_out;
> > > +
> > > +/**
> > > + * efi_main() - entry point of the EFI application.
> > > + *
> > > + * @handle: handle of the loaded image
> > > + * @systab: system table
> > > + * Return: status code
> > > + */
> > > +efi_status_t EFIAPI efi_main(efi_handle_t handle,
> > > + struct efi_system_table *systab)
> > > +{
> > > + struct efi_loaded_image *loaded_image;
> > > + efi_status_t ret;
> > > + efi_uintn_t map_size;
> > > + efi_uintn_t map_key;
> > > + efi_uintn_t desc_size;
> > > + u32 desc_version;
> > > +
> > > + systable = systab;
> > > + boottime = systable->boottime;
> > > + con_out = systable->con_out;
> > > +
> > > + /* Get the loaded image protocol */
> > > + ret = boottime->open_protocol(handle, &loaded_image_guid,
> > > + (void **)&loaded_image, NULL, NULL,
> > > + EFI_OPEN_PROTOCOL_GET_PROTOCOL);
> > > + if (ret != EFI_SUCCESS) {
> > > + con_out->output_string
> > > + (con_out, u"Cannot open loaded image protocol\r\n");
> > > + goto out;
> > > + }
> > > +
> > > + /* UEFI requires CR LF */
> > > + con_out->output_string(con_out, u"U-Boot test app for EFI_LOADER\r\n");
> > > +
> > > +out:
> > > + map_size = 0;
> > > + ret = boottime->get_memory_map(&map_size, NULL, &map_key, &desc_size,
> > > + &desc_version);
> > > + con_out->output_string(con_out, u"Exiting boot services\n");
> > > +
> > > + /* exit boot services so that this part of U-Boot can be tested */
> > > + boottime->exit_boot_services(handle, map_key);
> >
> > Hello Simon,
> >
> > I am not NAKing this patch. But maybe you could rethink if this call
> > tells us anything new about the correct function of ExitBootServices().
> >
> > We already have a test of ExitBootServices() in lib/efi_selftest/ and
> > maybe we should extend that test to check more.
> >
> > By removing ExitBootServices() we could keep U-Boot in a well defined
> > state which will allow us to run any number of bootmeth tests in
> > sequence and keep the EFI sub-system in a consistent state.
In the interests of trying to make some progress, I will drop that
line and worry about it later, when we can come up with follow-on
tests. It is exactly the 'exit-boot-services' call which was stopping
Ubuntu from booting. But since I don't have any test pieces to check
what happens in that situation, we can leave it for now.
>
> FWIW I proposed exactly the same in [0].
>
> [0] https://lore.kernel.org/u-boot/CAC_iWjJYqrh6MS50d6MxdStJFGg2pWnf1PHwQ9muYDPmOBP7Lg@mail.gmail.com/
>
> Thanks
> /Ilias
> >
> > Best regards
> >
> > Heinrich
> >
> >
> > > +
> > > + /* now exit for real */
> > > + ret = boottime->exit(handle, ret, 0, NULL);
> > > +
> > > + /* We should never arrive here */
> > > + return ret;
> > > +}
> >
Regards,
Simon
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