Hi all,
[Ard -- please can you look at the EFI parts of this patch]
On Tue, Jun 19, 2018 at 03:44:23PM +0900, AKASHI Takahiro wrote:
> Since arm_enter_runtime_services() was modified to always create a virtual
> mapping of UEFI memory map in the previous patch, it is now renamed to
> efi_enter_virtual_mode() and called earlier before acpi_load_tables()
> in acpi_early_init().
>
> This will allow us to use UEFI memory map in acpi_os_ioremap() to create
> mappings of ACPI tables using memory attributes described in UEFI memory
> map.
>
> See a relevant commit:
> arm64: acpi: fix alignment fault in accessing ACPI tables
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
> Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> ---
> drivers/firmware/efi/arm-runtime.c | 15 ++++++---------
> init/main.c | 3 +++
> 2 files changed, 9 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
> index 30ac5c82051e..566ef0a9edb5 100644
> --- a/drivers/firmware/efi/arm-runtime.c
> +++ b/drivers/firmware/efi/arm-runtime.c
> @@ -106,46 +106,43 @@ static bool __init efi_virtmap_init(void)
> * non-early mapping of the UEFI system table and virtual mappings for all
> * EFI_MEMORY_RUNTIME regions.
> */
> -static int __init arm_enable_runtime_services(void)
> +void __init efi_enter_virtual_mode(void)
> {
> u64 mapsize;
>
> if (!efi_enabled(EFI_BOOT)) {
> pr_info("EFI services will not be available.\n");
> - return 0;
> + return;
> }
>
> mapsize = efi.memmap.desc_size * efi.memmap.nr_map;
>
> if (efi_memmap_init_late(efi.memmap.phys_map, mapsize)) {
> pr_err("Failed to remap EFI memory map\n");
> - return 0;
> + return;
> }
>
> if (efi_runtime_disabled()) {
> pr_info("EFI runtime services will be disabled.\n");
> - return 0;
> + return;
> }
>
> if (efi_enabled(EFI_RUNTIME_SERVICES)) {
> pr_info("EFI runtime services access via paravirt.\n");
> - return 0;
> + return;
> }
>
> pr_info("Remapping and enabling EFI services.\n");
>
> if (!efi_virtmap_init()) {
> pr_err("UEFI virtual mapping missing or invalid -- runtime services will not be available\n");
> - return -ENOMEM;
> + return;
> }
>
> /* Set up runtime services function pointers */
> efi_native_runtime_setup();
> set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
> -
> - return 0;
> }
> -early_initcall(arm_enable_runtime_services);
>
> void efi_virtmap_load(void)
> {
> diff --git a/init/main.c b/init/main.c
> index 3b4ada11ed52..532fc0d02353 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -694,6 +694,9 @@ asmlinkage __visible void __init start_kernel(void)
> debug_objects_mem_init();
> setup_per_cpu_pageset();
> numa_policy_init();
> + if (IS_ENABLED(CONFIG_EFI) &&
> + (IS_ENABLED(CONFIG_ARM64) || IS_ENABLED(CONFIG_ARM)))
> + efi_enter_virtual_mode();
Hmm, this is ugly as hell. Is there nothing else we can piggy-back off?
It's also fairly jarring that, on x86, efi_enter_virtual_mode() is called
a few lines later, *after* acpi_early_init() has been called.
The rest of the series looks fine to me, but I'm not comfortable taking
changes like this via the arm64 tree.
Will
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