12:35 a.m.
1. Add support to 16K page size and 2-level page table with 36 VA bits.
2. Fix pmd, pud description when we use 'help -m'.
Kuan-Ying Lee (3):
arm64: Introduction of support for 16K page with 2-level table support
arm64: fix pmd description
arm64: simplify pud description
arm64.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++-----
defs.h | 11 +++++++
2 files changed, 100 insertions(+), 7 deletions(-)
--
2.34.1
12:35 a.m.
New subject: [PATCH 1/3] arm64: Introduction of support for 16K page with 2-level table support
Introduction of ARM64 support for 16K page size with 2-level page
table and 36 VA bits.
Signed-off-by: Kuan-Ying Lee <kuan-ying.lee(a)canonical.com>
---
arm64.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++--
defs.h | 11 +++++++
2 files changed, 98 insertions(+), 3 deletions(-)
diff --git a/arm64.c b/arm64.c
index 8ed1aaf919d6..002cc0078dad 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_2level_16k(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);
@@ -426,7 +427,16 @@ arm64_init(int when)
(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->flags |= VM_L2_16K;
+ if (!machdep->ptrs_per_pgd)
+ machdep->ptrs_per_pgd = PTRS_PER_PGD_L2_16K;
+ if ((machdep->pgd =
+ (char *)malloc(machdep->ptrs_per_pgd * 8)) == NULL)
+ error(FATAL, "cannot malloc pgd space.");
+ if ((machdep->ptbl =
+ (char *)malloc(PTRS_PER_PTE_L2_16K * 8)) == NULL)
+ error(FATAL, "cannot malloc ptbl space.");
+ machdep->pmd = NULL; /* not used */
}
machdep->pud = NULL; /* not used */
break;
@@ -1064,6 +1074,8 @@ 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_L2_16K)
+ fprintf(fp, "%sVM_L2_16K", others++ ? "|" : "");
if (machdep->flags & VM_L3_16K)
fprintf(fp, "%sVM_L3_16K", others++ ? "|" : "");
if (machdep->flags & VM_L3_4K)
@@ -1113,6 +1125,8 @@ arm64_dump_machdep_table(ulong arg)
"arm64_vtop_3level_4k" :
machdep->flags & VM_L4_4K ?
"arm64_vtop_4level_4k" :
+ machdep->flags & VM_L2_16K ?
+ "arm64_vtop_2level_16k" :
machdep->flags & VM_L3_16K ?
"arm64_vtop_3level_16k" :
machdep->flags & VM_L3_64K ?
@@ -1122,6 +1136,8 @@ arm64_dump_machdep_table(ulong arg)
"arm64_vtop_3level_4k" :
machdep->flags & VM_L4_4K ?
"arm64_vtop_4level_4k" :
+ machdep->flags & VM_L2_16K ?
+ "arm64_vtop_2level_16k" :
machdep->flags & VM_L3_16K ?
"arm64_vtop_3level_16k" :
machdep->flags & VM_L3_64K ?
@@ -1814,7 +1830,7 @@ 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|VM_L3_16K))
+ switch (machdep->flags &
(VM_L2_64K|VM_L3_64K|VM_L3_4K|VM_L4_4K|VM_L2_16K|VM_L3_16K))
{
case VM_L2_64K:
return arm64_vtop_2level_64k(kernel_pgd, kvaddr, paddr, verbose);
@@ -1824,6 +1840,8 @@ 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_L2_16K:
+ return arm64_vtop_2level_16k(kernel_pgd, kvaddr, paddr, verbose);
case VM_L3_16K:
return arm64_vtop_3level_16k(kernel_pgd, kvaddr, paddr, verbose);
default:
@@ -1841,7 +1859,7 @@ 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|VM_L3_16K))
+ switch (machdep->flags &
(VM_L2_64K|VM_L3_64K|VM_L3_4K|VM_L4_4K|VM_L2_16K|VM_L3_16K))
{
case VM_L2_64K:
return arm64_vtop_2level_64k(user_pgd, uvaddr, paddr, verbose);
@@ -1851,6 +1869,8 @@ 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_L2_16K:
+ return arm64_vtop_2level_16k(user_pgd, uvaddr, paddr, verbose);
case VM_L3_16K:
return arm64_vtop_3level_16k(user_pgd, uvaddr, paddr, verbose);
default:
@@ -2012,6 +2032,70 @@ no_page:
return FALSE;
}
+static int
+arm64_vtop_2level_16k(ulong pgd, ulong vaddr, physaddr_t *paddr, int verbose)
+{
+ ulong *pgd_base, *pgd_ptr, pgd_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_L2_16K) &
(machdep->ptrs_per_pgd - 1));
+ pgd_val = ULONG(machdep->pgd + PAGEOFFSET(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
+ * #define __PAGETABLE_PMD_FOLDED
+ */
+
+ if ((pgd_val & PMD_TYPE_MASK) == PMD_TYPE_SECT) {
+ ulong sectionbase = (pgd_val & SECTION_PAGE_MASK_32MB) & PHYS_MASK;
+ if (verbose) {
+ fprintf(fp, " PAGE: %lx (32MB%s)\n\n", sectionbase,
+ IS_ZEROPAGE(sectionbase) ? ", ZERO PAGE" : "");
+ arm64_translate_pte(pgd_val, 0, 0);
+ }
+ *paddr = sectionbase + (vaddr & ~SECTION_PAGE_MASK_32MB);
+ return TRUE;
+ }
+
+ pte_base = (ulong *)PTOV(pgd_val & PHYS_MASK & (s32)machdep->pagemask);
+ FILL_PTBL(pte_base, KVADDR, PTRS_PER_PTE_L2_16K * sizeof(ulong));
+ pte_ptr = pte_base + (((vaddr) >> machdep->pageshift) &
(PTRS_PER_PTE_L2_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 = (PAGEBASE(pte_val) & PHYS_MASK) + 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_16k(ulong pgd, ulong vaddr, physaddr_t *paddr, int verbose)
{
diff --git a/defs.h b/defs.h
index 1b7649d9f05c..dfbd2419f969 100644
--- a/defs.h
+++ b/defs.h
@@ -3302,6 +3302,16 @@ typedef signed int s32;
#define PGDIR_MASK_48VA (~(PGDIR_SIZE_48VA - 1))
#define PGDIR_OFFSET_48VA(X) (((ulong)(X)) & (PGDIR_SIZE_48VA - 1))
+/*
+ * 2-levels / 16K pages
+ * 36-bit VA
+ */
+#define PTRS_PER_PGD_L2_16K (2048)
+#define PTRS_PER_PTE_L2_16K (2048)
+#define PGDIR_SHIFT_L2_16K (25)
+#define PGDIR_SIZE_L2_16K ((1UL) << PGDIR_SHIFT_L2_16K)
+#define PGDIR_MASK_L2_16K (~(PGDIR_SIZE_L2_16K-1))
+
/*
* 3-levels / 16K pages
* 47-bit VA
@@ -3383,6 +3393,7 @@ typedef signed int s32;
#define OVERFLOW_STACKS (0x1000)
#define ARM64_MTE (0x2000)
#define VM_L3_16K (0x4000)
+#define VM_L2_16K (0x8000)
/*
* Get kimage_voffset from /dev/crash
--
2.34.1
12:35 a.m.
New subject: [PATCH 2/3] arm64: fix pmd description
If we use 2-level page table translation, we won't use
the pmd table. Mark pmd as 'not used' when we use 2-level
page table translation.
Signed-off-by: Kuan-Ying Lee <kuan-ying.lee(a)canonical.com>
---
arm64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arm64.c b/arm64.c
index 002cc0078dad..2386c9901f83 100644
--- a/arm64.c
+++ b/arm64.c
@@ -1181,7 +1181,7 @@ arm64_dump_machdep_table(ulong arg)
else
fprintf(fp, "%lx\n", machdep->last_pud_read);
fprintf(fp, " last_pmd_read: ");
- if (PAGESIZE() == 65536)
+ if ((machdep->flags & VM_L2_64K) || (machdep->flags & VM_L2_16K))
fprintf(fp, "(not used)\n");
else
fprintf(fp, "%lx\n", machdep->last_pmd_read);
--
2.34.1
12:35 a.m.
New subject: [PATCH 3/3] arm64: simplify pud description
Crash only supports 4-level page table translation for 4K page now.
We use pud only when we use 4-level page table translation.
Thus, we can use page table level flag to know if we need
pud or not.
Signed-off-by: Kuan-Ying Lee <kuan-ying.lee(a)canonical.com>
---
arm64.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/arm64.c b/arm64.c
index 2386c9901f83..ec6f5df3290a 100644
--- a/arm64.c
+++ b/arm64.c
@@ -1174,9 +1174,7 @@ arm64_dump_machdep_table(ulong arg)
fprintf(fp, " line_number_hooks: (not used)\n");
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)))
+ if (!(machdep->flags & VM_L4_4K))
fprintf(fp, "(not used)\n");
else
fprintf(fp, "%lx\n", machdep->last_pud_read);
--
2.34.1
6:36 p.m.
New subject: [PATCH 0/3] arm64: Introduction of support 16K page with 2-level table
Hi Kuan-Ying,
On Thu, Aug 8, 2024 at 5:36 PM Kuan-Ying Lee
<kuan-ying.lee(a)canonical.com> wrote:
1. Add support to 16K page size and 2-level page table with 36 VA bits.
2. Fix pmd, pud description when we use 'help -m'.
Thanks for the patchset. It looks good to me and tests OK, so ack.
Thanks,
Tao Liu
Kuan-Ying Lee (3):
arm64: Introduction of support for 16K page with 2-level table support
arm64: fix pmd description
arm64: simplify pud description
arm64.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++-----
defs.h | 11 +++++++
2 files changed, 100 insertions(+), 7 deletions(-)
--
2.34.1
--
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Tao Liu