mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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cc456c4e7c
The git commite7a5cd063c7b4c58417f674821d63f5eb6747e37
("x86-64, gdt: Store/load GDT for ACPI S3 or hibernate/resume path
is not needed.") assumes that for the hibernate path the booting
kernel and the resuming kernel MUST be the same. That is certainly
the case for a 32-bit kernel (see check_image_kernel and
CONFIG_ARCH_HIBERNATION_HEADER config option).
However for 64-bit kernels it is OK to have a different kernel
version (and size of the image) of the booting and resuming kernels.
Hence the above mentioned git commit introduces an regression.
This patch fixes it by introducing a 'struct desc_ptr gdt_desc'
back in the 'struct saved_context'. However instead of having in the
'save_processor_state' and 'restore_processor_state' the
store/load_gdt calls, we are only saving the GDT in the
save_processor_state.
For the restore path the lgdt operation is done in
hibernate_asm_[32|64].S in the 'restore_registers' path.
The apt reader of this description will recognize that only 64-bit
kernels need this treatment, not 32-bit. This patch adds the logic
in the 32-bit path to be more similar to 64-bit so that in the future
the unification process can take advantage of this.
[ hpa: this also reverts an inadvertent on-disk format change ]
Suggested-by: "H. Peter Anvin" <hpa@zytor.com>
Acked-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/1367459610-9656-2-git-send-email-konrad.wilk@oracle.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
/*
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* Copyright 2001-2003 Pavel Machek <pavel@suse.cz>
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* Based on code
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* Copyright 2001 Patrick Mochel <mochel@osdl.org>
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*/
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#ifndef _ASM_X86_SUSPEND_64_H
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#define _ASM_X86_SUSPEND_64_H
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#include <asm/desc.h>
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#include <asm/i387.h>
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/*
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* Image of the saved processor state, used by the low level ACPI suspend to
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* RAM code and by the low level hibernation code.
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*
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* If you modify it, fix arch/x86/kernel/acpi/wakeup_64.S and make sure that
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* __save/__restore_processor_state(), defined in arch/x86/kernel/suspend_64.c,
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* still work as required.
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*/
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struct saved_context {
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struct pt_regs regs;
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u16 ds, es, fs, gs, ss;
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unsigned long gs_base, gs_kernel_base, fs_base;
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unsigned long cr0, cr2, cr3, cr4, cr8;
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u64 misc_enable;
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bool misc_enable_saved;
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unsigned long efer;
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u16 gdt_pad; /* Unused */
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struct desc_ptr gdt_desc;
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u16 idt_pad;
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u16 idt_limit;
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unsigned long idt_base;
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u16 ldt;
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u16 tss;
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unsigned long tr;
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unsigned long safety;
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unsigned long return_address;
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} __attribute__((packed));
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#define loaddebug(thread,register) \
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set_debugreg((thread)->debugreg##register, register)
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/* routines for saving/restoring kernel state */
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extern int acpi_save_state_mem(void);
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extern char core_restore_code;
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extern char restore_registers;
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#endif /* _ASM_X86_SUSPEND_64_H */
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