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arm64: allow ID map to be extended to 52 bits

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Currently, when using VA_BITS < 48, if the ID map text happens to be
placed in physical memory above VA_BITS, we increase the VA size (up to
48) and create a new table level, in order to map in the ID map text.
This is okay because the system always supports 48 bits of VA.

This patch extends the code such that if the system supports 52 bits of
VA, and the ID map text is placed that high up, then we increase the VA
size accordingly, up to 52.

One difference from the current implementation is that so far the
condition of VA_BITS < 48 has meant that the top level table is always
"full", with the maximum number of entries, and an extra table level is
always needed. Now, when VA_BITS = 48 (and using 64k pages), the top
level table is not full, and we simply need to increase the number of
entries in it, instead of creating a new table level.

Tested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Tested-by: Bob Picco <bob.picco@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
[catalin.marinas@arm.com: reduce arguments to __create_hyp_mappings()]
[catalin.marinas@arm.com: reworked/renamed __cpu_uses_extended_idmap_level()]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Kristina Martsenko
2017-12-13 17:07:24 +00:00
committed by Catalin Marinas
parent 75387b9263
commit fa2a8445b1
8 changed files with 85 additions and 47 deletions
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80
arch/arm64/kernel/head.S
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@@ -176,7 +176,7 @@ ENDPROC(preserve_boot_args)
* ptrs: #imm pointers per table page
*
* Preserves: virt
* Corrupts: tmp1, tmp2
* Corrupts: ptrs, tmp1, tmp2
* Returns: tbl -> next level table page address
*/
.macro create_table_entry, tbl, virt, shift, ptrs, tmp1, tmp2
@@ -184,7 +184,8 @@ ENDPROC(preserve_boot_args)
phys_to_pte \tmp1, \tmp2
orr \tmp2, \tmp2, #PMD_TYPE_TABLE // address of next table and entry type
lsr \tmp1, \virt, #\shift
and \tmp1, \tmp1, #\ptrs - 1 // table index
sub \ptrs, \ptrs, #1
and \tmp1, \tmp1, \ptrs // table index
str \tmp2, [\tbl, \tmp1, lsl #3]
add \tbl, \tbl, #PAGE_SIZE // next level table page
.endm
@@ -194,15 +195,17 @@ ENDPROC(preserve_boot_args)
* block entry in the next level (tbl) for the given virtual address.
*
* Preserves: tbl, next, virt
* Corrupts: tmp1, tmp2
* Corrupts: ptrs_per_pgd, tmp1, tmp2
*/
.macro create_pgd_entry, tbl, virt, tmp1, tmp2
create_table_entry \tbl, \virt, PGDIR_SHIFT, PTRS_PER_PGD, \tmp1, \tmp2
.macro create_pgd_entry, tbl, virt, ptrs_per_pgd, tmp1, tmp2
create_table_entry \tbl, \virt, PGDIR_SHIFT, \ptrs_per_pgd, \tmp1, \tmp2
#if SWAPPER_PGTABLE_LEVELS > 3
create_table_entry \tbl, \virt, PUD_SHIFT, PTRS_PER_PUD, \tmp1, \tmp2
mov \ptrs_per_pgd, PTRS_PER_PUD
create_table_entry \tbl, \virt, PUD_SHIFT, \ptrs_per_pgd, \tmp1, \tmp2
#endif
#if SWAPPER_PGTABLE_LEVELS > 2
create_table_entry \tbl, \virt, SWAPPER_TABLE_SHIFT, PTRS_PER_PTE, \tmp1, \tmp2
mov \ptrs_per_pgd, PTRS_PER_PTE
create_table_entry \tbl, \virt, SWAPPER_TABLE_SHIFT, \ptrs_per_pgd, \tmp1, \tmp2
#endif
.endm
@@ -266,16 +269,34 @@ __create_page_tables:
adrp x0, idmap_pg_dir
adrp x3, __idmap_text_start // __pa(__idmap_text_start)
#ifndef CONFIG_ARM64_VA_BITS_48
/*
* VA_BITS may be too small to allow for an ID mapping to be created
* that covers system RAM if that is located sufficiently high in the
* physical address space. So for the ID map, use an extended virtual
* range in that case, and configure an additional translation level
* if needed.
*
* Calculate the maximum allowed value for TCR_EL1.T0SZ so that the
* entire ID map region can be mapped. As T0SZ == (64 - #bits used),
* this number conveniently equals the number of leading zeroes in
* the physical address of __idmap_text_end.
*/
adrp x5, __idmap_text_end
clz x5, x5
cmp x5, TCR_T0SZ(VA_BITS) // default T0SZ small enough?
b.ge 1f // .. then skip VA range extension
adr_l x6, idmap_t0sz
str x5, [x6]
dmb sy
dc ivac, x6 // Invalidate potentially stale cache line
#if (VA_BITS < 48)
#define EXTRA_SHIFT (PGDIR_SHIFT + PAGE_SHIFT - 3)
#define EXTRA_PTRS (1 << (48 - EXTRA_SHIFT))
#define EXTRA_PTRS (1 << (PHYS_MASK_SHIFT - EXTRA_SHIFT))
/*
* If VA_BITS < 48, it may be too small to allow for an ID mapping to be
* created that covers system RAM if that is located sufficiently high
* in the physical address space. So for the ID map, use an extended
* virtual range in that case, by configuring an additional translation
* level.
* If VA_BITS < 48, we have to configure an additional table level.
* First, we have to verify our assumption that the current value of
* VA_BITS was chosen such that all translation levels are fully
* utilised, and that lowering T0SZ will always result in an additional
@@ -285,27 +306,19 @@ __create_page_tables:
#error "Mismatch between VA_BITS and page size/number of translation levels"
#endif
mov x4, EXTRA_PTRS
create_table_entry x0, x3, EXTRA_SHIFT, x4, x5, x6
#else
/*
* Calculate the maximum allowed value for TCR_EL1.T0SZ so that the
* entire ID map region can be mapped. As T0SZ == (64 - #bits used),
* this number conveniently equals the number of leading zeroes in
* the physical address of __idmap_text_end.
* If VA_BITS == 48, we don't have to configure an additional
* translation level, but the top-level table has more entries.
*/
adrp x5, __idmap_text_end
clz x5, x5
cmp x5, TCR_T0SZ(VA_BITS) // default T0SZ small enough?
b.ge 1f // .. then skip additional level
adr_l x6, idmap_t0sz
str x5, [x6]
dmb sy
dc ivac, x6 // Invalidate potentially stale cache line
create_table_entry x0, x3, EXTRA_SHIFT, EXTRA_PTRS, x5, x6
1:
mov x4, #1 << (PHYS_MASK_SHIFT - PGDIR_SHIFT)
str_l x4, idmap_ptrs_per_pgd, x5
#endif
create_pgd_entry x0, x3, x5, x6
1:
ldr_l x4, idmap_ptrs_per_pgd
create_pgd_entry x0, x3, x4, x5, x6
mov x5, x3 // __pa(__idmap_text_start)
adr_l x6, __idmap_text_end // __pa(__idmap_text_end)
create_block_map x0, x7, x3, x5, x6, x4
@@ -316,7 +329,8 @@ __create_page_tables:
adrp x0, swapper_pg_dir
mov_q x5, KIMAGE_VADDR + TEXT_OFFSET // compile time __va(_text)
add x5, x5, x23 // add KASLR displacement
create_pgd_entry x0, x5, x3, x6
mov x4, PTRS_PER_PGD
create_pgd_entry x0, x5, x4, x3, x6
adrp x6, _end // runtime __pa(_end)
adrp x3, _text // runtime __pa(_text)
sub x6, x6, x3 // _end - _text