x86/mm: remove vmalloc faulting

Remove fault handling on vmalloc areas, as the vmalloc code now takes
care of synchronizing changes to all page-tables in the system.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Link: http://lkml.kernel.org/r/20200515140023.25469-8-joro@8bytes.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 134 deletions

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 255fc631b042..dffe8e4d3140 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -215,44 +215,6 @@ void arch_sync_kernel_mappings(unsigned long start, unsigned long end)
 }
 
 /*
- * 32-bit:
- *
- *   Handle a fault on the vmalloc or module mapping area
- */
-static noinline int vmalloc_fault(unsigned long address)
-{
-	unsigned long pgd_paddr;
-	pmd_t *pmd_k;
-	pte_t *pte_k;
-
-	/* Make sure we are in vmalloc area: */
-	if (!(address >= VMALLOC_START && address < VMALLOC_END))
-		return -1;
-
-	/*
-	 * Synchronize this task's top level page-table
-	 * with the 'reference' page table.
-	 *
-	 * Do _not_ use "current" here. We might be inside
-	 * an interrupt in the middle of a task switch..
-	 */
-	pgd_paddr = read_cr3_pa();
-	pmd_k = vmalloc_sync_one(__va(pgd_paddr), address);
-	if (!pmd_k)
-		return -1;
-
-	if (pmd_large(*pmd_k))
-		return 0;
-
-	pte_k = pte_offset_kernel(pmd_k, address);
-	if (!pte_present(*pte_k))
-		return -1;
-
-	return 0;
-}
-NOKPROBE_SYMBOL(vmalloc_fault);
-
-/*
  * Did it hit the DOS screen memory VA from vm86 mode?
  */
 static inline void
@@ -316,79 +278,6 @@ out:
 
 #else /* CONFIG_X86_64: */
 
-/*
- * 64-bit:
- *
- *   Handle a fault on the vmalloc area
- */
-static noinline int vmalloc_fault(unsigned long address)
-{
-	pgd_t *pgd, *pgd_k;
-	p4d_t *p4d, *p4d_k;
-	pud_t *pud;
-	pmd_t *pmd;
-	pte_t *pte;
-
-	/* Make sure we are in vmalloc area: */
-	if (!(address >= VMALLOC_START && address < VMALLOC_END))
-		return -1;
-
-	/*
-	 * Copy kernel mappings over when needed. This can also
-	 * happen within a race in page table update. In the later
-	 * case just flush:
-	 */
-	pgd = (pgd_t *)__va(read_cr3_pa()) + pgd_index(address);
-	pgd_k = pgd_offset_k(address);
-	if (pgd_none(*pgd_k))
-		return -1;
-
-	if (pgtable_l5_enabled()) {
-		if (pgd_none(*pgd)) {
-			set_pgd(pgd, *pgd_k);
-			arch_flush_lazy_mmu_mode();
-		} else {
-			BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_k));
-		}
-	}
-
-	/* With 4-level paging, copying happens on the p4d level. */
-	p4d = p4d_offset(pgd, address);
-	p4d_k = p4d_offset(pgd_k, address);
-	if (p4d_none(*p4d_k))
-		return -1;
-
-	if (p4d_none(*p4d) && !pgtable_l5_enabled()) {
-		set_p4d(p4d, *p4d_k);
-		arch_flush_lazy_mmu_mode();
-	} else {
-		BUG_ON(p4d_pfn(*p4d) != p4d_pfn(*p4d_k));
-	}
-
-	BUILD_BUG_ON(CONFIG_PGTABLE_LEVELS < 4);
-
-	pud = pud_offset(p4d, address);
-	if (pud_none(*pud))
-		return -1;
-
-	if (pud_large(*pud))
-		return 0;
-
-	pmd = pmd_offset(pud, address);
-	if (pmd_none(*pmd))
-		return -1;
-
-	if (pmd_large(*pmd))
-		return 0;
-
-	pte = pte_offset_kernel(pmd, address);
-	if (!pte_present(*pte))
-		return -1;
-
-	return 0;
-}
-NOKPROBE_SYMBOL(vmalloc_fault);
-
 #ifdef CONFIG_CPU_SUP_AMD
 static const char errata93_warning[] =
 KERN_ERR 
@@ -1227,29 +1116,6 @@ do_kern_addr_fault(struct pt_regs *regs, unsigned long hw_error_code,
 	 */
 	WARN_ON_ONCE(hw_error_code & X86_PF_PK);
 
-	/*
-	 * We can fault-in kernel-space virtual memory on-demand. The
-	 * 'reference' page table is init_mm.pgd.
-	 *
-	 * NOTE! We MUST NOT take any locks for this case. We may
-	 * be in an interrupt or a critical region, and should
-	 * only copy the information from the master page table,
-	 * nothing more.
-	 *
-	 * Before doing this on-demand faulting, ensure that the
-	 * fault is not any of the following:
-	 * 1. A fault on a PTE with a reserved bit set.
-	 * 2. A fault caused by a user-mode access.  (Do not demand-
-	 *    fault kernel memory due to user-mode accesses).
-	 * 3. A fault caused by a page-level protection violation.
-	 *    (A demand fault would be on a non-present page which
-	 *     would have X86_PF_PROT==0).
-	 */
-	if (!(hw_error_code & (X86_PF_RSVD | X86_PF_USER | X86_PF_PROT))) {
-		if (vmalloc_fault(address) >= 0)
-			return;
-	}
-
 	/* Was the fault spurious, caused by lazy TLB invalidation? */
 	if (spurious_kernel_fault(hw_error_code, address))
 		return;