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x86/pgtable: Move pgdp kernel/user conversion functions to pgtable.h
Make them available on 32 bit and clone_pgd_range() happy. Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Pavel Machek <pavel@ucw.cz> Cc: "H . Peter Anvin" <hpa@zytor.com> Cc: linux-mm@kvack.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Brian Gerst <brgerst@gmail.com> Cc: David Laight <David.Laight@aculab.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Eduardo Valentin <eduval@amazon.com> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: Will Deacon <will.deacon@arm.com> Cc: aliguori@amazon.com Cc: daniel.gruss@iaik.tugraz.at Cc: hughd@google.com Cc: keescook@google.com Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Waiman Long <llong@redhat.com> Cc: "David H . Gutteridge" <dhgutteridge@sympatico.ca> Cc: joro@8bytes.org Link: https://lkml.kernel.org/r/1531906876-13451-19-git-send-email-joro@8bytes.org
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@ -1155,6 +1155,55 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
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}
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#endif
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#ifdef CONFIG_PAGE_TABLE_ISOLATION
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/*
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* All top-level PAGE_TABLE_ISOLATION page tables are order-1 pages
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* (8k-aligned and 8k in size). The kernel one is at the beginning 4k and
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* the user one is in the last 4k. To switch between them, you
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* just need to flip the 12th bit in their addresses.
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*/
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#define PTI_PGTABLE_SWITCH_BIT PAGE_SHIFT
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/*
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* This generates better code than the inline assembly in
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* __set_bit().
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*/
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static inline void *ptr_set_bit(void *ptr, int bit)
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{
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unsigned long __ptr = (unsigned long)ptr;
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__ptr |= BIT(bit);
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return (void *)__ptr;
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}
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static inline void *ptr_clear_bit(void *ptr, int bit)
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{
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unsigned long __ptr = (unsigned long)ptr;
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__ptr &= ~BIT(bit);
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return (void *)__ptr;
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}
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static inline pgd_t *kernel_to_user_pgdp(pgd_t *pgdp)
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{
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return ptr_set_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
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}
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static inline pgd_t *user_to_kernel_pgdp(pgd_t *pgdp)
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{
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return ptr_clear_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
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}
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static inline p4d_t *kernel_to_user_p4dp(p4d_t *p4dp)
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{
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return ptr_set_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
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}
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static inline p4d_t *user_to_kernel_p4dp(p4d_t *p4dp)
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{
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return ptr_clear_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
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}
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#endif /* CONFIG_PAGE_TABLE_ISOLATION */
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/*
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* clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
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*
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@ -132,55 +132,6 @@ static inline pud_t native_pudp_get_and_clear(pud_t *xp)
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#endif
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}
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#ifdef CONFIG_PAGE_TABLE_ISOLATION
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/*
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* All top-level PAGE_TABLE_ISOLATION page tables are order-1 pages
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* (8k-aligned and 8k in size). The kernel one is at the beginning 4k and
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* the user one is in the last 4k. To switch between them, you
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* just need to flip the 12th bit in their addresses.
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*/
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#define PTI_PGTABLE_SWITCH_BIT PAGE_SHIFT
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/*
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* This generates better code than the inline assembly in
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* __set_bit().
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*/
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static inline void *ptr_set_bit(void *ptr, int bit)
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{
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unsigned long __ptr = (unsigned long)ptr;
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__ptr |= BIT(bit);
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return (void *)__ptr;
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}
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static inline void *ptr_clear_bit(void *ptr, int bit)
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{
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unsigned long __ptr = (unsigned long)ptr;
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__ptr &= ~BIT(bit);
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return (void *)__ptr;
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}
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static inline pgd_t *kernel_to_user_pgdp(pgd_t *pgdp)
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{
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return ptr_set_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
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}
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static inline pgd_t *user_to_kernel_pgdp(pgd_t *pgdp)
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{
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return ptr_clear_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
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}
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static inline p4d_t *kernel_to_user_p4dp(p4d_t *p4dp)
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{
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return ptr_set_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
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}
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static inline p4d_t *user_to_kernel_p4dp(p4d_t *p4dp)
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{
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return ptr_clear_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
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}
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#endif /* CONFIG_PAGE_TABLE_ISOLATION */
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/*
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* Page table pages are page-aligned. The lower half of the top
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* level is used for userspace and the top half for the kernel.
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