[Crash-utility] Re: [PATCH] arm64: Introduction of support for 16K page with 3-level table support

Hi Kuan-Ying, On Thu, Jul 25, 2024 at 2:44 PM <kuan-ying.lee(a)canonical.com&gt; wrote: > > Hi crash maintainers, > > Could you please help review this patch that supports 16K page size with a 3-level page table and 47 bits? >

Yes, it is on my to-do list, since it is a large patch, I need to take some time for testing and reviewing. Thanks, Tao Liu > Thank you, > Kuan-Ying Lee > > > Introduction of ARM64 support for 16K page size with 3-level page > > table and 47 VA bits. > > > > Signed-off-by: Kuan-Ying Lee <kuan-ying.lee(a)canonical.com&gt; > > --- > > arm64.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-- > > defs.h | 16 ++++++++ > > 2 files changed, 126 insertions(+), 4 deletions(-) > > > > diff --git a/arm64.c b/arm64.c > > index b3040d757946..5356ae1f5cce 100644 > > --- a/arm64.c > > +++ b/arm64.c > > @@ -42,6 +42,7 @@ static int arm64_kvtop(struct task_context *, ulong, physaddr_t *, > > int); > > static int arm64_uvtop(struct task_context *, ulong, physaddr_t *, int); > > static int arm64_vtop_2level_64k(ulong, ulong, physaddr_t *, int); > > static int arm64_vtop_3level_64k(ulong, ulong, physaddr_t *, int); > > +static int arm64_vtop_3level_16k(ulong, ulong, physaddr_t *, int); > > static int arm64_vtop_3level_4k(ulong, ulong, physaddr_t *, int); > > static int arm64_vtop_4level_4k(ulong, ulong, physaddr_t *, int); > > static ulong arm64_get_task_pgd(ulong); > > @@ -261,8 +262,7 @@ arm64_init(int when) > > machdep->pagesize = 4096; > > break; > > case 2: > > - /* TODO: machdep->pagesize = 16384; */ > > - error(FATAL, "16K pages not supported."); > > + machdep->pagesize = 16384; > > break; > > case 3: > > machdep->pagesize = 65536; > > @@ -392,6 +392,26 @@ arm64_init(int when) > > error(FATAL, "cannot malloc ptbl space."); > > break; > > > > + case 16384: > > + if (machdep->machspec->VA_BITS > PGDIR_SHIFT_L3_16K) { > > + machdep->flags |= VM_L3_16K; > > + if (!machdep->ptrs_per_pgd) > > + machdep->ptrs_per_pgd = PTRS_PER_PGD_L3_16K; > > + if ((machdep->pgd = > > + (char *)malloc(machdep->ptrs_per_pgd * 8)) == NULL) > > + error(FATAL, "cannot malloc pgd space."); > > + if ((machdep->pmd = > > + (char *)malloc(PTRS_PER_PMD_L3_16K * 8)) == NULL) > > + error(FATAL, "cannot malloc pmd space."); > > + if ((machdep->ptbl = > > + (char *)malloc(PTRS_PER_PTE_L3_16K * 8)) == NULL) > > + error(FATAL, "cannot malloc ptbl space."); > > + } else { > > + error(FATAL, "we only support 47 bits, 3 level for 16K page now."); > > + } > > + machdep->pud = NULL; /* not used */ > > + break; > > + > > case 65536: > > if (kernel_symbol_exists("idmap_ptrs_per_pgd") && > > readmem(symbol_value("idmap_ptrs_per_pgd"), KVADDR, > > @@ -1018,6 +1038,8 @@ arm64_dump_machdep_table(ulong arg) > > fprintf(fp, "%sVM_L2_64K", others++ ? "|" : ""); > > if (machdep->flags & VM_L3_64K) > > fprintf(fp, "%sVM_L3_64K", others++ ? "|" : ""); > > + if (machdep->flags & VM_L3_16K) > > + fprintf(fp, "%sVM_L3_16K", others++ ? "|" : ""); > > if (machdep->flags & VM_L3_4K) > > fprintf(fp, "%sVM_L3_4K", others++ ? "|" : ""); > > if (machdep->flags & VM_L4_4K) > > @@ -1065,6 +1087,8 @@ arm64_dump_machdep_table(ulong arg) > > "arm64_vtop_3level_4k" : > > machdep->flags & VM_L4_4K ? > > "arm64_vtop_4level_4k" : > > + machdep->flags & VM_L3_16K ? > > + "arm64_vtop_3level_16k" : > > machdep->flags & VM_L3_64K ? > > "arm64_vtop_3level_64k" : "arm64_vtop_2level_64k"); > > fprintf(fp, " kvtop: arm64_kvtop()->%s()\n", > > @@ -1072,6 +1096,8 @@ arm64_dump_machdep_table(ulong arg) > > "arm64_vtop_3level_4k" : > > machdep->flags & VM_L4_4K ? > > "arm64_vtop_4level_4k" : > > + machdep->flags & VM_L3_16K ? > > + "arm64_vtop_3level_16k" : > > machdep->flags & VM_L3_64K ? > > "arm64_vtop_3level_64k" : "arm64_vtop_2level_64k"); > > fprintf(fp, " get_task_pgd: arm64_get_task_pgd()\n"); > > @@ -1107,6 +1133,7 @@ arm64_dump_machdep_table(ulong arg) > > fprintf(fp, " last_pgd_read: %lx\n", machdep->last_pgd_read); > > fprintf(fp, " last_pud_read: "); > > if ((PAGESIZE() == 65536) || > > + (PAGESIZE() == 16384) || > > ((PAGESIZE() == 4096) && !(machdep->flags & VM_L4_4K))) > > fprintf(fp, "(not used)\n"); > > else > > @@ -1761,7 +1788,7 @@ arm64_kvtop(struct task_context *tc, ulong kvaddr, physaddr_t > > *paddr, int verbos > > kernel_pgd = vt->kernel_pgd[0]; > > *paddr = 0; > > > > - switch (machdep->flags & (VM_L2_64K|VM_L3_64K|VM_L3_4K|VM_L4_4K)) > > + switch (machdep->flags & (VM_L2_64K|VM_L3_64K|VM_L3_4K|VM_L4_4K|VM_L3_16K)) > > { > > case VM_L2_64K: > > return arm64_vtop_2level_64k(kernel_pgd, kvaddr, paddr, verbose); > > @@ -1771,6 +1798,8 @@ arm64_kvtop(struct task_context *tc, ulong kvaddr, physaddr_t > > *paddr, int verbos > > return arm64_vtop_3level_4k(kernel_pgd, kvaddr, paddr, verbose); > > case VM_L4_4K: > > return arm64_vtop_4level_4k(kernel_pgd, kvaddr, paddr, verbose); > > + case VM_L3_16K: > > + return arm64_vtop_3level_16k(kernel_pgd, kvaddr, paddr, verbose); > > default: > > return FALSE; > > } > > @@ -1786,7 +1815,7 @@ arm64_uvtop(struct task_context *tc, ulong uvaddr, physaddr_t > > *paddr, int verbos > > > > *paddr = 0; > > > > - switch (machdep->flags & (VM_L2_64K|VM_L3_64K|VM_L3_4K|VM_L4_4K)) > > + switch (machdep->flags & (VM_L2_64K|VM_L3_64K|VM_L3_4K|VM_L4_4K|VM_L3_16K)) > > { > > case VM_L2_64K: > > return arm64_vtop_2level_64k(user_pgd, uvaddr, paddr, verbose); > > @@ -1796,6 +1825,8 @@ arm64_uvtop(struct task_context *tc, ulong uvaddr, physaddr_t > > *paddr, int verbos > > return arm64_vtop_3level_4k(user_pgd, uvaddr, paddr, verbose); > > case VM_L4_4K: > > return arm64_vtop_4level_4k(user_pgd, uvaddr, paddr, verbose); > > + case VM_L3_16K: > > + return arm64_vtop_3level_16k(user_pgd, uvaddr, paddr, verbose); > > default: > > return FALSE; > > } > > @@ -1812,6 +1843,7 @@ arm64_uvtop(struct task_context *tc, ulong uvaddr, physaddr_t > > *paddr, int verbos > > #define PMD_TYPE_SECT 1 > > #define PMD_TYPE_TABLE 2 > > #define SECTION_PAGE_MASK_2MB ((long)(~((MEGABYTES(2))-1))) > > +#define SECTION_PAGE_MASK_32MB ((long)(~((MEGABYTES(32))-1))) > > #define SECTION_PAGE_MASK_512MB ((long)(~((MEGABYTES(512))-1))) > > #define SECTION_PAGE_MASK_1GB ((long)(~((GIGABYTES(1))-1))) > > > > @@ -1954,6 +1986,80 @@ no_page: > > return FALSE; > > } > > > > +static int > > +arm64_vtop_3level_16k(ulong pgd, ulong vaddr, physaddr_t *paddr, int verbose) > > +{ > > + ulong *pgd_base, *pgd_ptr, pgd_val; > > + ulong *pmd_base, *pmd_ptr, pmd_val; > > + ulong *pte_base, *pte_ptr, pte_val; > > + > > + if (verbose) > > + fprintf(fp, "PAGE DIRECTORY: %lx\n", pgd); > > + > > + pgd_base = (ulong *)pgd; > > + FILL_PGD(pgd_base, KVADDR, machdep->ptrs_per_pgd * sizeof(ulong)); > > + pgd_ptr = pgd_base + (((vaddr) >> PGDIR_SHIFT_L3_16K) & > > (machdep->ptrs_per_pgd - 1)); > > + pgd_val = ULONG(machdep->pgd + PGDIR_OFFSET_L3_16K(pgd_ptr)); > > + if (verbose) > > + fprintf(fp, " PGD: %lx => %lx\n", (ulong)pgd_ptr, > > pgd_val); > > + if (!pgd_val) > > + goto no_page; > > + > > + /* > > + * #define __PAGETABLE_PUD_FOLDED > > + */ > > + > > + pmd_base = (ulong *)PTOV(PTE_TO_PHYS(pgd_val)); > > + FILL_PMD(pmd_base, KVADDR, PTRS_PER_PMD_L3_16K * sizeof(ulong)); > > + pmd_ptr = pmd_base + (((vaddr) >> PMD_SHIFT_L3_16K) & (PTRS_PER_PMD_L3_16K - > > 1)); > > + pmd_val = ULONG(machdep->pmd + PAGEOFFSET(pmd_ptr)); > > + if (verbose) > > + fprintf(fp, " PMD: %lx => %lx\n", (ulong)pmd_ptr, > > pmd_val); > > + if (!pmd_val) > > + goto no_page; > > + > > + if ((pmd_val & PMD_TYPE_MASK) == PMD_TYPE_SECT) { > > + ulong sectionbase = PTE_TO_PHYS(pmd_val) & SECTION_PAGE_MASK_32MB; > > + if (verbose) { > > + fprintf(fp, " PAGE: %lx (32MB%s)\n\n", sectionbase, > > + IS_ZEROPAGE(sectionbase) ? ", ZERO PAGE" : ""); > > + arm64_translate_pte(pmd_val, 0, 0); > > + } > > + *paddr = sectionbase + (vaddr & ~SECTION_PAGE_MASK_32MB); > > + return TRUE; > > + } > > + > > + pte_base = (ulong *)PTOV(PTE_TO_PHYS(pmd_val)); > > + FILL_PTBL(pte_base, KVADDR, PTRS_PER_PTE_L3_16K * sizeof(ulong)); > > + pte_ptr = pte_base + (((vaddr) >> machdep->pageshift) & > > (PTRS_PER_PTE_L3_16K - 1)); > > + pte_val = ULONG(machdep->ptbl + PAGEOFFSET(pte_ptr)); > > + if (verbose) > > + fprintf(fp, " PTE: %lx => %lx\n", (ulong)pte_ptr, > > pte_val); > > + if (!pte_val) > > + goto no_page; > > + > > + if (pte_val & PTE_VALID) { > > + *paddr = PTE_TO_PHYS(pte_val) + PAGEOFFSET(vaddr); > > + if (verbose) { > > + fprintf(fp, " PAGE: %lx %s\n\n", PAGEBASE(*paddr), > > + IS_ZEROPAGE(PAGEBASE(*paddr)) ? "(ZERO PAGE)" : ""); > > + arm64_translate_pte(pte_val, 0, 0); > > + } > > + } else { > > + if (IS_UVADDR(vaddr, NULL)) > > + *paddr = pte_val; > > + if (verbose) { > > + fprintf(fp, "\n"); > > + arm64_translate_pte(pte_val, 0, 0); > > + } > > + goto no_page; > > + } > > + > > + return TRUE; > > +no_page: > > + return FALSE; > > +} > > + > > static int > > arm64_vtop_3level_4k(ulong pgd, ulong vaddr, physaddr_t *paddr, int verbose) > > { > > diff --git a/defs.h b/defs.h > > index 49e6923ede54..1b7649d9f05c 100644 > > --- a/defs.h > > +++ b/defs.h > > @@ -3302,6 +3302,21 @@ typedef signed int s32; > > #define PGDIR_MASK_48VA (~(PGDIR_SIZE_48VA - 1)) > > #define PGDIR_OFFSET_48VA(X) (((ulong)(X)) & (PGDIR_SIZE_48VA - 1)) > > > > +/* > > + * 3-levels / 16K pages > > + * 47-bit VA > > + */ > > +#define PTRS_PER_PGD_L3_16K ((1UL) << (47 - 36)) > > +#define PTRS_PER_PMD_L3_16K (2048) > > +#define PTRS_PER_PTE_L3_16K (2048) > > +#define PGDIR_SHIFT_L3_16K (36) > > +#define PGDIR_SIZE_L3_16K ((1UL) << PGDIR_SHIFT_L3_16K) > > +#define PGDIR_MASK_L3_16K (~(PGDIR_SIZE_L3_16K-1)) > > +#define PMD_SHIFT_L3_16K (25) > > +#define PMD_SIZE_L3_16K (1UL << PMD_SHIFT_L3_16K) > > +#define PMD_MASK_L3_16K (~(PMD_SIZE_L3_16K-1)) > > +#define PGDIR_OFFSET_L3_16K(X) (((ulong)(X)) & ((machdep->ptrs_per_pgd * 8) - 1)) > > + > > /* > > * 3-levels / 64K pages > > */ > > @@ -3367,6 +3382,7 @@ typedef signed int s32; > > #define HAS_PHYSVIRT_OFFSET (0x800) > > #define OVERFLOW_STACKS (0x1000) > > #define ARM64_MTE (0x2000) > > +#define VM_L3_16K (0x4000) > > > > /* > > * Get kimage_voffset from /dev/crash > -- > Crash-utility mailing list -- devel(a)lists.crash-utility.osci.io > To unsubscribe send an email to devel-leave(a)lists.crash-utility.osci.io > https://${domain_name}/admin/lists/devel.lists.crash-utility.osci.io/ > Contribution Guidelines: https://github.com/crash-utility/crash/wiki