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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e05c7b1f2b
The powerpc 32-bit implementation of pgtable has nice shortcuts for accessing kernel PMD and PTE for a given virtual address. Make these helpers available for all architectures. [rppt@linux.ibm.com: microblaze: fix page table traversal in setup_rt_frame()] Link: http://lkml.kernel.org/r/20200518191511.GD1118872@kernel.org [akpm@linux-foundation.org: s/pmd_ptr_k/pmd_off_k/ in various powerpc places] Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-9-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#define DISABLE_BRANCH_PROFILING
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#include <linux/kasan.h>
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#include <linux/memblock.h>
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#include <linux/hugetlb.h>
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#include <asm/pgalloc.h>
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static int __init
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kasan_init_shadow_8M(unsigned long k_start, unsigned long k_end, void *block)
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{
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pmd_t *pmd = pmd_off_k(k_start);
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unsigned long k_cur, k_next;
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for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd += 2, block += SZ_8M) {
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pte_basic_t *new;
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k_next = pgd_addr_end(k_cur, k_end);
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k_next = pgd_addr_end(k_next, k_end);
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if ((void *)pmd_page_vaddr(*pmd) != kasan_early_shadow_pte)
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continue;
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new = memblock_alloc(sizeof(pte_basic_t), SZ_4K);
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if (!new)
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return -ENOMEM;
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*new = pte_val(pte_mkhuge(pfn_pte(PHYS_PFN(__pa(block)), PAGE_KERNEL)));
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hugepd_populate_kernel((hugepd_t *)pmd, (pte_t *)new, PAGE_SHIFT_8M);
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hugepd_populate_kernel((hugepd_t *)pmd + 1, (pte_t *)new, PAGE_SHIFT_8M);
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}
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return 0;
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}
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int __init kasan_init_region(void *start, size_t size)
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{
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unsigned long k_start = (unsigned long)kasan_mem_to_shadow(start);
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unsigned long k_end = (unsigned long)kasan_mem_to_shadow(start + size);
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unsigned long k_cur;
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int ret;
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void *block;
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block = memblock_alloc(k_end - k_start, SZ_8M);
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if (!block)
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return -ENOMEM;
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if (IS_ALIGNED(k_start, SZ_8M)) {
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kasan_init_shadow_8M(k_start, ALIGN_DOWN(k_end, SZ_8M), block);
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k_cur = ALIGN_DOWN(k_end, SZ_8M);
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if (k_cur == k_end)
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goto finish;
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} else {
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k_cur = k_start;
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}
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ret = kasan_init_shadow_page_tables(k_start, k_end);
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if (ret)
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return ret;
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for (; k_cur < k_end; k_cur += PAGE_SIZE) {
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pmd_t *pmd = pmd_off_k(k_cur);
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void *va = block + k_cur - k_start;
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pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL);
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if (k_cur < ALIGN_DOWN(k_end, SZ_512K))
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pte = pte_mkhuge(pte);
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__set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0);
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}
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finish:
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flush_tlb_kernel_range(k_start, k_end);
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return 0;
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}
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