80d0969aa7
The mask must not include bits above physical address mask. These bits are reserved and can be used for other things. Bits 61 and 62 are used for Linear Address Masking. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com> Reviewed-by: Alexander Potapenko <glider@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Alexander Potapenko <glider@google.com> Link: https://lore.kernel.org/all/20221109165140.9137-2-kirill.shutemov%40linux.intel.com
56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_PROCESSOR_FLAGS_H
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#define _ASM_X86_PROCESSOR_FLAGS_H
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#include <uapi/asm/processor-flags.h>
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#include <linux/mem_encrypt.h>
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#ifdef CONFIG_VM86
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#define X86_VM_MASK X86_EFLAGS_VM
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#else
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#define X86_VM_MASK 0 /* No VM86 support */
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#endif
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/*
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* CR3's layout varies depending on several things.
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*
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* If CR4.PCIDE is set (64-bit only), then CR3[11:0] is the address space ID.
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* If PAE is enabled, then CR3[11:5] is part of the PDPT address
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* (i.e. it's 32-byte aligned, not page-aligned) and CR3[4:0] is ignored.
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* Otherwise (non-PAE, non-PCID), CR3[3] is PWT, CR3[4] is PCD, and
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* CR3[2:0] and CR3[11:5] are ignored.
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*
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* In all cases, Linux puts zeros in the low ignored bits and in PWT and PCD.
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*
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* CR3[63] is always read as zero. If CR4.PCIDE is set, then CR3[63] may be
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* written as 1 to prevent the write to CR3 from flushing the TLB.
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*
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* On systems with SME, one bit (in a variable position!) is stolen to indicate
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* that the top-level paging structure is encrypted.
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*
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* All of the remaining bits indicate the physical address of the top-level
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* paging structure.
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*
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* CR3_ADDR_MASK is the mask used by read_cr3_pa().
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*/
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#ifdef CONFIG_X86_64
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/* Mask off the address space ID and SME encryption bits. */
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#define CR3_ADDR_MASK __sme_clr(PHYSICAL_PAGE_MASK)
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#define CR3_PCID_MASK 0xFFFull
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#define CR3_NOFLUSH BIT_ULL(63)
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#else
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/*
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* CR3_ADDR_MASK needs at least bits 31:5 set on PAE systems, and we save
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* a tiny bit of code size by setting all the bits.
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*/
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#define CR3_ADDR_MASK 0xFFFFFFFFull
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#define CR3_PCID_MASK 0ull
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#define CR3_NOFLUSH 0
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#endif
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#ifdef CONFIG_PAGE_TABLE_ISOLATION
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# define X86_CR3_PTI_PCID_USER_BIT 11
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#endif
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#endif /* _ASM_X86_PROCESSOR_FLAGS_H */
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