f88a68facd
Add early_memremap() support to be able to specify encrypted and decrypted mappings with and without write-protection. The use of write-protection is necessary when encrypting data "in place". The write-protect attribute is considered cacheable for loads, but not stores. This implies that the hardware will never give the core a dirty line with this memtype. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@suse.de> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Dave Young <dyoung@redhat.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Larry Woodman <lwoodman@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Toshimitsu Kani <toshi.kani@hpe.com> Cc: kasan-dev@googlegroups.com Cc: kvm@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-doc@vger.kernel.org Cc: linux-efi@vger.kernel.org Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/479b5832c30fae3efa7932e48f81794e86397229.1500319216.git.thomas.lendacky@amd.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
#ifndef _ASM_EARLY_IOREMAP_H_
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#define _ASM_EARLY_IOREMAP_H_
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#include <linux/types.h>
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/*
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* early_ioremap() and early_iounmap() are for temporary early boot-time
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* mappings, before the real ioremap() is functional.
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*/
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extern void __iomem *early_ioremap(resource_size_t phys_addr,
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unsigned long size);
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extern void *early_memremap(resource_size_t phys_addr,
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unsigned long size);
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extern void *early_memremap_ro(resource_size_t phys_addr,
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unsigned long size);
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extern void *early_memremap_prot(resource_size_t phys_addr,
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unsigned long size, unsigned long prot_val);
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extern void early_iounmap(void __iomem *addr, unsigned long size);
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extern void early_memunmap(void *addr, unsigned long size);
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/*
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* Weak function called by early_ioremap_reset(). It does nothing, but
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* architectures may provide their own version to do any needed cleanups.
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*/
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extern void early_ioremap_shutdown(void);
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#if defined(CONFIG_GENERIC_EARLY_IOREMAP) && defined(CONFIG_MMU)
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/* Arch-specific initialization */
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extern void early_ioremap_init(void);
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/* Generic initialization called by architecture code */
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extern void early_ioremap_setup(void);
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/*
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* Called as last step in paging_init() so library can act
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* accordingly for subsequent map/unmap requests.
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*/
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extern void early_ioremap_reset(void);
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/*
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* Early copy from unmapped memory to kernel mapped memory.
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*/
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extern void copy_from_early_mem(void *dest, phys_addr_t src,
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unsigned long size);
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#else
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static inline void early_ioremap_init(void) { }
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static inline void early_ioremap_setup(void) { }
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static inline void early_ioremap_reset(void) { }
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#endif
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#endif /* _ASM_EARLY_IOREMAP_H_ */
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