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The CR3 register entry can contain the SME encryption mask that indicates the PGD is encrypted. The encryption mask should not be used when creating a virtual address from the CR3 register, so remove the SME encryption mask in the read_cr3_pa() function. During early boot SME will need to use a native version of read_cr3_pa(), so create native_read_cr3_pa(). 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/767b085c384a46f67f451f8589903a462c7ff68a.1500319216.git.thomas.lendacky@amd.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
#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(0x7FFFFFFFFFFFF000ull)
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#define CR3_PCID_MASK 0xFFFull
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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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#endif
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#endif /* _ASM_X86_PROCESSOR_FLAGS_H */
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