Re: [PATCH v5 03/10] x86, efi: Push EFI_MEMMAP check into leaf routines
From: Ard Biesheuvel
Date: Fri Sep 13 2019 - 05:05:59 EST
On Fri, 30 Aug 2019 at 03:06, Dan Williams <dan.j.williams@xxxxxxxxx> wrote:
>
> In preparation for adding another EFI_MEMMAP dependent call that needs
> to occur before e820__memblock_setup() fixup the existing efi calls to
> check for EFI_MEMMAP internally. This ends up being cleaner than the
> alternative of checking EFI_MEMMAP multiple times in setup_arch().
>
> Cc: <x86@xxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> Cc: Andy Lutomirski <luto@xxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Reviewed-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
I'd prefer it if the spurious whitespace changes could be dropped, but
otherwise, this looks fine to me, so I am not going to obsess about
it.
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
> ---
> arch/x86/include/asm/efi.h | 9 ++++++++-
> arch/x86/kernel/setup.c | 19 +++++++++----------
> arch/x86/platform/efi/efi.c | 3 +++
> arch/x86/platform/efi/quirks.c | 3 +++
> drivers/firmware/efi/esrt.c | 3 +++
> drivers/firmware/efi/fake_mem.c | 2 +-
> include/linux/efi.h | 2 --
> 7 files changed, 27 insertions(+), 14 deletions(-)
>
> diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
> index 43a82e59c59d..45f853bce869 100644
> --- a/arch/x86/include/asm/efi.h
> +++ b/arch/x86/include/asm/efi.h
> @@ -140,7 +140,6 @@ extern void efi_delete_dummy_variable(void);
> extern void efi_switch_mm(struct mm_struct *mm);
> extern void efi_recover_from_page_fault(unsigned long phys_addr);
> extern void efi_free_boot_services(void);
> -extern void efi_reserve_boot_services(void);
>
> struct efi_setup_data {
> u64 fw_vendor;
> @@ -244,6 +243,8 @@ static inline bool efi_is_64bit(void)
> extern bool efi_reboot_required(void);
> extern bool efi_is_table_address(unsigned long phys_addr);
>
> +extern void efi_find_mirror(void);
> +extern void efi_reserve_boot_services(void);
> #else
> static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
> static inline bool efi_reboot_required(void)
> @@ -254,6 +255,12 @@ static inline bool efi_is_table_address(unsigned long phys_addr)
> {
> return false;
> }
> +static inline void efi_find_mirror(void)
> +{
> +}
> +static inline void efi_reserve_boot_services(void)
> +{
> +}
> #endif /* CONFIG_EFI */
>
> #endif /* _ASM_X86_EFI_H */
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index bbe35bf879f5..9bfecb542440 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -1118,21 +1118,20 @@ void __init setup_arch(char **cmdline_p)
> cleanup_highmap();
>
> memblock_set_current_limit(ISA_END_ADDRESS);
> +
> e820__memblock_setup();
>
> reserve_bios_regions();
>
> - if (efi_enabled(EFI_MEMMAP)) {
> - efi_fake_memmap();
> - efi_find_mirror();
> - efi_esrt_init();
> + efi_fake_memmap();
> + efi_find_mirror();
> + efi_esrt_init();
>
> - /*
> - * The EFI specification says that boot service code won't be
> - * called after ExitBootServices(). This is, in fact, a lie.
> - */
> - efi_reserve_boot_services();
> - }
> + /*
> + * The EFI specification says that boot service code won't be
> + * called after ExitBootServices(). This is, in fact, a lie.
> + */
> + efi_reserve_boot_services();
>
> /* preallocate 4k for mptable mpc */
> e820__memblock_alloc_reserved_mpc_new();
> diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
> index c202e1b07e29..0bb58eb33ca0 100644
> --- a/arch/x86/platform/efi/efi.c
> +++ b/arch/x86/platform/efi/efi.c
> @@ -128,6 +128,9 @@ void __init efi_find_mirror(void)
> efi_memory_desc_t *md;
> u64 mirror_size = 0, total_size = 0;
>
> + if (!efi_enabled(EFI_MEMMAP))
> + return;
> +
> for_each_efi_memory_desc(md) {
> unsigned long long start = md->phys_addr;
> unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
> diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c
> index 3b9fd679cea9..7675cf754d90 100644
> --- a/arch/x86/platform/efi/quirks.c
> +++ b/arch/x86/platform/efi/quirks.c
> @@ -320,6 +320,9 @@ void __init efi_reserve_boot_services(void)
> {
> efi_memory_desc_t *md;
>
> + if (!efi_enabled(EFI_MEMMAP))
> + return;
> +
> for_each_efi_memory_desc(md) {
> u64 start = md->phys_addr;
> u64 size = md->num_pages << EFI_PAGE_SHIFT;
> diff --git a/drivers/firmware/efi/esrt.c b/drivers/firmware/efi/esrt.c
> index d6dd5f503fa2..2762e0662bf4 100644
> --- a/drivers/firmware/efi/esrt.c
> +++ b/drivers/firmware/efi/esrt.c
> @@ -246,6 +246,9 @@ void __init efi_esrt_init(void)
> int rc;
> phys_addr_t end;
>
> + if (!efi_enabled(EFI_MEMMAP))
> + return;
> +
> pr_debug("esrt-init: loading.\n");
> if (!esrt_table_exists())
> return;
> diff --git a/drivers/firmware/efi/fake_mem.c b/drivers/firmware/efi/fake_mem.c
> index 9501edc0fcfb..526b45331d96 100644
> --- a/drivers/firmware/efi/fake_mem.c
> +++ b/drivers/firmware/efi/fake_mem.c
> @@ -44,7 +44,7 @@ void __init efi_fake_memmap(void)
> void *new_memmap;
> int i;
>
> - if (!nr_fake_mem)
> + if (!efi_enabled(EFI_MEMMAP) || !nr_fake_mem)
> return;
>
> /* count up the number of EFI memory descriptor */
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index 5c1dd0221384..acc2b8982ed2 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -1045,9 +1045,7 @@ extern void efi_enter_virtual_mode (void); /* switch EFI to virtual mode, if pos
> extern efi_status_t efi_query_variable_store(u32 attributes,
> unsigned long size,
> bool nonblocking);
> -extern void efi_find_mirror(void);
> #else
> -
> static inline efi_status_t efi_query_variable_store(u32 attributes,
> unsigned long size,
> bool nonblocking)
>