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Commit db93f8b4 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 fixes from Peter Anvin:
 "Three groups of fixes:

   1. Make sure we don't execute the early microcode patching if family
      < 6, since it would touch MSRs which don't exist on those
      families, causing crashes.

   2. The Xen partial emulation of HyperV can be dealt with more
      gracefully than just disabling the driver.

   3. More EFI variable space magic.  In particular, variables hidden
      from runtime code need to be taken into account too."

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, microcode: Verify the family before dispatching microcode patching
  x86, hyperv: Handle Xen emulation of Hyper-V more gracefully
  x86,efi: Implement efi_no_storage_paranoia parameter
  efi: Export efi_query_variable_store() for efivars.ko
  x86/Kconfig: Make EFI select UCS2_STRING
  efi: Distinguish between "remaining space" and actually used space
  efi: Pass boot services variable info to runtime code
  Move utf16 functions to kernel core and rename
  x86,efi: Check max_size only if it is non-zero.
  x86, efivars: firmware bug workarounds should be in platform code
parents 8c3a13c8 c0a9f451

Documentation/kernel-parameters.txt

+6 −0
Original line number Diff line number Diff line
@@ -788,6 +788,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 
	edd=		[EDD]

			Format: {"off" | "on" | "skip[mbr]"}



	efi_no_storage_paranoia [EFI; X86]

			Using this parameter you can use more than 50% of

			your efi variable storage. Use this parameter only if

			you are really sure that your UEFI does sane gc and

			fulfills the spec otherwise your board may brick.



	eisa_irq_edge=	[PARISC,HW]

			See header of drivers/parisc/eisa.c.

arch/x86/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -1549,6 +1549,7 @@ config X86_SMAP 
config EFI

	bool "EFI runtime service support"

	depends on ACPI

	select UCS2_STRING

	---help---

	  This enables the kernel to use EFI runtime services that are

	  available (such as the EFI variable services).

arch/x86/boot/compressed/eboot.c

+47 −0
Original line number Diff line number Diff line
@@ -251,6 +251,51 @@ static void find_bits(unsigned long mask, u8 *pos, u8 *size) 
	*size = len;

}



static efi_status_t setup_efi_vars(struct boot_params *params)

{

	struct setup_data *data;

	struct efi_var_bootdata *efidata;

	u64 store_size, remaining_size, var_size;

	efi_status_t status;



	if (!sys_table->runtime->query_variable_info)

		return EFI_UNSUPPORTED;



	data = (struct setup_data *)(unsigned long)params->hdr.setup_data;



	while (data && data->next)

		data = (struct setup_data *)(unsigned long)data->next;



	status = efi_call_phys4(sys_table->runtime->query_variable_info,

				EFI_VARIABLE_NON_VOLATILE |

				EFI_VARIABLE_BOOTSERVICE_ACCESS |

				EFI_VARIABLE_RUNTIME_ACCESS, &store_size,

				&remaining_size, &var_size);



	if (status != EFI_SUCCESS)

		return status;



	status = efi_call_phys3(sys_table->boottime->allocate_pool,

				EFI_LOADER_DATA, sizeof(*efidata), &efidata);



	if (status != EFI_SUCCESS)

		return status;



	efidata->data.type = SETUP_EFI_VARS;

	efidata->data.len = sizeof(struct efi_var_bootdata) -

		sizeof(struct setup_data);

	efidata->data.next = 0;

	efidata->store_size = store_size;

	efidata->remaining_size = remaining_size;

	efidata->max_var_size = var_size;



	if (data)

		data->next = (unsigned long)efidata;

	else

		params->hdr.setup_data = (unsigned long)efidata;



}



static efi_status_t setup_efi_pci(struct boot_params *params)

{

	efi_pci_io_protocol *pci;
@@ -1157,6 +1202,8 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table, 


	setup_graphics(boot_params);



	setup_efi_vars(boot_params);



	setup_efi_pci(boot_params);



	status = efi_call_phys3(sys_table->boottime->allocate_pool,

arch/x86/include/asm/efi.h

+7 −0
Original line number Diff line number Diff line
@@ -102,6 +102,13 @@ extern void efi_call_phys_epilog(void); 
extern void efi_unmap_memmap(void);

extern void efi_memory_uc(u64 addr, unsigned long size);



struct efi_var_bootdata {

	struct setup_data data;

	u64 store_size;

	u64 remaining_size;

	u64 max_var_size;

};



#ifdef CONFIG_EFI



static inline bool efi_is_native(void)

arch/x86/include/uapi/asm/bootparam.h

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
#define SETUP_E820_EXT			1

#define SETUP_DTB			2

#define SETUP_PCI			3

#define SETUP_EFI_VARS			4



/* ram_size flags */

#define RAMDISK_IMAGE_START_MASK	0x07FF