| Message ID | 20241014105912.3207374-44-ryan.roberts@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Boot-time page size selection for arm64 | expand |
On 2024-10-14 11:58:51+0100, Ryan Roberts wrote: > Increase alignment of sections in nvhe hyp, vdso and final vmlinux image > from PAGE_SIZE to PAGE_SIZE_MAX. For compile-time PAGE_SIZE, > PAGE_SIZE_MAX == PAGE_SIZE so there is no change. For boot-time > PAGE_SIZE, PAGE_SIZE_MAX is the largest selectable page size. > > For a boot-time page size build, image size is comparable to a 64K page > size compile-time build. In future, it may be desirable to optimize > run-time memory consumption by freeing unused padding pages when the > boot-time selected page size is less than PAGE_SIZE_MAX. > > Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> > --- > > ***NOTE*** > Any confused maintainers may want to read the cover note here for context: > https://lore.kernel.org/all/20241014105514.3206191-1-ryan.roberts@arm.com/ > > arch/arm64/include/asm/memory.h | 4 +-- > arch/arm64/kernel/vdso-wrap.S | 4 +-- > arch/arm64/kernel/vdso.c | 7 +++--- > arch/arm64/kernel/vdso/vdso.lds.S | 4 +-- > arch/arm64/kernel/vdso32-wrap.S | 4 +-- > arch/arm64/kernel/vdso32/vdso.lds.S | 4 +-- > arch/arm64/kernel/vmlinux.lds.S | 38 ++++++++++++++--------------- > arch/arm64/kvm/hyp/nvhe/hyp.lds.S | 2 +- > 8 files changed, 34 insertions(+), 33 deletions(-) > diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c > index 89b6e78400023..1efe98909a2e0 100644 > --- a/arch/arm64/kernel/vdso.c > +++ b/arch/arm64/kernel/vdso.c > @@ -195,7 +195,7 @@ static int __setup_additional_pages(enum vdso_abi abi, > > vdso_text_len = vdso_info[abi].vdso_pages << PAGE_SHIFT; > /* Be sure to map the data page */ > - vdso_mapping_len = vdso_text_len + VVAR_NR_PAGES * PAGE_SIZE; > + vdso_mapping_len = vdso_text_len + VVAR_NR_PAGES * PAGE_SIZE_MAX; > > vdso_base = get_unmapped_area(NULL, 0, vdso_mapping_len, 0, 0); > if (IS_ERR_VALUE(vdso_base)) { > @@ -203,7 +203,8 @@ static int __setup_additional_pages(enum vdso_abi abi, > goto up_fail; > } > > - ret = _install_special_mapping(mm, vdso_base, VVAR_NR_PAGES * PAGE_SIZE, > + ret = _install_special_mapping(mm, vdso_base, > + VVAR_NR_PAGES * PAGE_SIZE_MAX, > VM_READ|VM_MAYREAD|VM_PFNMAP, > vdso_info[abi].dm); > if (IS_ERR(ret)) > @@ -212,7 +213,7 @@ static int __setup_additional_pages(enum vdso_abi abi, > if (system_supports_bti_kernel()) > gp_flags = VM_ARM64_BTI; > > - vdso_base += VVAR_NR_PAGES * PAGE_SIZE; > + vdso_base += VVAR_NR_PAGES * PAGE_SIZE_MAX; > mm->context.vdso = (void *)vdso_base; > ret = _install_special_mapping(mm, vdso_base, vdso_text_len, > VM_READ|VM_EXEC|gp_flags| > diff --git a/arch/arm64/kernel/vdso/vdso.lds.S b/arch/arm64/kernel/vdso/vdso.lds.S > index 45354f2ddf706..f7d1537a689e8 100644 > --- a/arch/arm64/kernel/vdso/vdso.lds.S > +++ b/arch/arm64/kernel/vdso/vdso.lds.S > @@ -18,9 +18,9 @@ OUTPUT_ARCH(aarch64) > > SECTIONS > { > - PROVIDE(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE); > + PROVIDE(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE_MAX); > #ifdef CONFIG_TIME_NS > - PROVIDE(_timens_data = _vdso_data + PAGE_SIZE); > + PROVIDE(_timens_data = _vdso_data + PAGE_SIZE_MAX); This looks like it also needs a change to vvar_fault() in vdso.c. The symbols are now always PAGE_SIZE_MAX apart, while vvar_fault() works in page offsets (vmf->pgoff) that are based on the runtime PAGE_SIZE and it expects hardcoded offsets. As test you can use tools/testing/selftests/timens/timens. (I can't test this right now, so it's only a suspicion) > #endif > . = VDSO_LBASE + SIZEOF_HEADERS; > diff --git a/arch/arm64/kernel/vdso32/vdso.lds.S b/arch/arm64/kernel/vdso32/vdso.lds.S > index 8d95d7d35057d..c46d18a69d1ce 100644 > --- a/arch/arm64/kernel/vdso32/vdso.lds.S > +++ b/arch/arm64/kernel/vdso32/vdso.lds.S > @@ -18,9 +18,9 @@ OUTPUT_ARCH(arm) > > SECTIONS > { > - PROVIDE_HIDDEN(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE); > + PROVIDE_HIDDEN(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE_MAX); > #ifdef CONFIG_TIME_NS > - PROVIDE_HIDDEN(_timens_data = _vdso_data + PAGE_SIZE); > + PROVIDE_HIDDEN(_timens_data = _vdso_data + PAGE_SIZE_MAX); > #endif > . = VDSO_LBASE + SIZEOF_HEADERS;
On 19/10/2024 15:16, Thomas Weißschuh wrote: > On 2024-10-14 11:58:51+0100, Ryan Roberts wrote: >> Increase alignment of sections in nvhe hyp, vdso and final vmlinux image >> from PAGE_SIZE to PAGE_SIZE_MAX. For compile-time PAGE_SIZE, >> PAGE_SIZE_MAX == PAGE_SIZE so there is no change. For boot-time >> PAGE_SIZE, PAGE_SIZE_MAX is the largest selectable page size. >> >> For a boot-time page size build, image size is comparable to a 64K page >> size compile-time build. In future, it may be desirable to optimize >> run-time memory consumption by freeing unused padding pages when the >> boot-time selected page size is less than PAGE_SIZE_MAX. >> >> Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> >> --- >> >> ***NOTE*** >> Any confused maintainers may want to read the cover note here for context: >> https://lore.kernel.org/all/20241014105514.3206191-1-ryan.roberts@arm.com/ >> >> arch/arm64/include/asm/memory.h | 4 +-- >> arch/arm64/kernel/vdso-wrap.S | 4 +-- >> arch/arm64/kernel/vdso.c | 7 +++--- >> arch/arm64/kernel/vdso/vdso.lds.S | 4 +-- >> arch/arm64/kernel/vdso32-wrap.S | 4 +-- >> arch/arm64/kernel/vdso32/vdso.lds.S | 4 +-- >> arch/arm64/kernel/vmlinux.lds.S | 38 ++++++++++++++--------------- >> arch/arm64/kvm/hyp/nvhe/hyp.lds.S | 2 +- >> 8 files changed, 34 insertions(+), 33 deletions(-) > >> diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c >> index 89b6e78400023..1efe98909a2e0 100644 >> --- a/arch/arm64/kernel/vdso.c >> +++ b/arch/arm64/kernel/vdso.c >> @@ -195,7 +195,7 @@ static int __setup_additional_pages(enum vdso_abi abi, >> >> vdso_text_len = vdso_info[abi].vdso_pages << PAGE_SHIFT; >> /* Be sure to map the data page */ >> - vdso_mapping_len = vdso_text_len + VVAR_NR_PAGES * PAGE_SIZE; >> + vdso_mapping_len = vdso_text_len + VVAR_NR_PAGES * PAGE_SIZE_MAX; >> >> vdso_base = get_unmapped_area(NULL, 0, vdso_mapping_len, 0, 0); >> if (IS_ERR_VALUE(vdso_base)) { >> @@ -203,7 +203,8 @@ static int __setup_additional_pages(enum vdso_abi abi, >> goto up_fail; >> } >> >> - ret = _install_special_mapping(mm, vdso_base, VVAR_NR_PAGES * PAGE_SIZE, >> + ret = _install_special_mapping(mm, vdso_base, >> + VVAR_NR_PAGES * PAGE_SIZE_MAX, >> VM_READ|VM_MAYREAD|VM_PFNMAP, >> vdso_info[abi].dm); >> if (IS_ERR(ret)) >> @@ -212,7 +213,7 @@ static int __setup_additional_pages(enum vdso_abi abi, >> if (system_supports_bti_kernel()) >> gp_flags = VM_ARM64_BTI; >> >> - vdso_base += VVAR_NR_PAGES * PAGE_SIZE; >> + vdso_base += VVAR_NR_PAGES * PAGE_SIZE_MAX; >> mm->context.vdso = (void *)vdso_base; >> ret = _install_special_mapping(mm, vdso_base, vdso_text_len, >> VM_READ|VM_EXEC|gp_flags| > >> diff --git a/arch/arm64/kernel/vdso/vdso.lds.S b/arch/arm64/kernel/vdso/vdso.lds.S >> index 45354f2ddf706..f7d1537a689e8 100644 >> --- a/arch/arm64/kernel/vdso/vdso.lds.S >> +++ b/arch/arm64/kernel/vdso/vdso.lds.S >> @@ -18,9 +18,9 @@ OUTPUT_ARCH(aarch64) >> >> SECTIONS >> { >> - PROVIDE(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE); >> + PROVIDE(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE_MAX); >> #ifdef CONFIG_TIME_NS >> - PROVIDE(_timens_data = _vdso_data + PAGE_SIZE); >> + PROVIDE(_timens_data = _vdso_data + PAGE_SIZE_MAX); > > This looks like it also needs a change to vvar_fault() in vdso.c. > The symbols are now always PAGE_SIZE_MAX apart, while vvar_fault() works > in page offsets (vmf->pgoff) that are based on the runtime PAGE_SIZE and > it expects hardcoded offsets. > > As test you can use tools/testing/selftests/timens/timens. > > (I can't test this right now, so it's only a suspicion) Ahh good spot - that test does infact fail. This fixes the problem: ---8<--- diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c index 1efe98909a2e0..d2049ba6b19f5 100644 --- a/arch/arm64/kernel/vdso.c +++ b/arch/arm64/kernel/vdso.c @@ -151,10 +151,11 @@ int vdso_join_timens(struct task_struct *task, struct time_namespace *ns) static vm_fault_t vvar_fault(const struct vm_special_mapping *sm, struct vm_area_struct *vma, struct vm_fault *vmf) { + pgoff_t pgmaxoff = vmf->pgoff >> (PAGE_SHIFT_MAX - PAGE_SHIFT); struct page *timens_page = find_timens_vvar_page(vma); unsigned long pfn; - switch (vmf->pgoff) { + switch (pgmaxoff) { case VVAR_DATA_PAGE_OFFSET: if (timens_page) pfn = page_to_pfn(timens_page); ---8<--- I'll include it in the next version. Thanks, Ryan > >> #endif >> . = VDSO_LBASE + SIZEOF_HEADERS; > >> diff --git a/arch/arm64/kernel/vdso32/vdso.lds.S b/arch/arm64/kernel/vdso32/vdso.lds.S >> index 8d95d7d35057d..c46d18a69d1ce 100644 >> --- a/arch/arm64/kernel/vdso32/vdso.lds.S >> +++ b/arch/arm64/kernel/vdso32/vdso.lds.S >> @@ -18,9 +18,9 @@ OUTPUT_ARCH(arm) >> >> SECTIONS >> { >> - PROVIDE_HIDDEN(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE); >> + PROVIDE_HIDDEN(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE_MAX); >> #ifdef CONFIG_TIME_NS >> - PROVIDE_HIDDEN(_timens_data = _vdso_data + PAGE_SIZE); >> + PROVIDE_HIDDEN(_timens_data = _vdso_data + PAGE_SIZE_MAX); >> #endif >> . = VDSO_LBASE + SIZEOF_HEADERS;
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index 6aa97fa22dc30..5393a859183f7 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -195,13 +195,13 @@ * Open-coded (swapper_pg_dir - reserved_pg_dir) as this cannot be calculated * until link time. */ -#define RESERVED_SWAPPER_OFFSET (PAGE_SIZE) +#define RESERVED_SWAPPER_OFFSET (PAGE_SIZE_MAX) /* * Open-coded (swapper_pg_dir - tramp_pg_dir) as this cannot be calculated * until link time. */ -#define TRAMP_SWAPPER_OFFSET (2 * PAGE_SIZE) +#define TRAMP_SWAPPER_OFFSET (2 * PAGE_SIZE_MAX) #ifndef __ASSEMBLY__ diff --git a/arch/arm64/kernel/vdso-wrap.S b/arch/arm64/kernel/vdso-wrap.S index c4b1990bf2be0..79fa77628199b 100644 --- a/arch/arm64/kernel/vdso-wrap.S +++ b/arch/arm64/kernel/vdso-wrap.S @@ -13,10 +13,10 @@ .globl vdso_start, vdso_end .section .rodata - .balign PAGE_SIZE + .balign PAGE_SIZE_MAX vdso_start: .incbin "arch/arm64/kernel/vdso/vdso.so" - .balign PAGE_SIZE + .balign PAGE_SIZE_MAX vdso_end: .previous diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c index 89b6e78400023..1efe98909a2e0 100644 --- a/arch/arm64/kernel/vdso.c +++ b/arch/arm64/kernel/vdso.c @@ -195,7 +195,7 @@ static int __setup_additional_pages(enum vdso_abi abi, vdso_text_len = vdso_info[abi].vdso_pages << PAGE_SHIFT; /* Be sure to map the data page */ - vdso_mapping_len = vdso_text_len + VVAR_NR_PAGES * PAGE_SIZE; + vdso_mapping_len = vdso_text_len + VVAR_NR_PAGES * PAGE_SIZE_MAX; vdso_base = get_unmapped_area(NULL, 0, vdso_mapping_len, 0, 0); if (IS_ERR_VALUE(vdso_base)) { @@ -203,7 +203,8 @@ static int __setup_additional_pages(enum vdso_abi abi, goto up_fail; } - ret = _install_special_mapping(mm, vdso_base, VVAR_NR_PAGES * PAGE_SIZE, + ret = _install_special_mapping(mm, vdso_base, + VVAR_NR_PAGES * PAGE_SIZE_MAX, VM_READ|VM_MAYREAD|VM_PFNMAP, vdso_info[abi].dm); if (IS_ERR(ret)) @@ -212,7 +213,7 @@ static int __setup_additional_pages(enum vdso_abi abi, if (system_supports_bti_kernel()) gp_flags = VM_ARM64_BTI; - vdso_base += VVAR_NR_PAGES * PAGE_SIZE; + vdso_base += VVAR_NR_PAGES * PAGE_SIZE_MAX; mm->context.vdso = (void *)vdso_base; ret = _install_special_mapping(mm, vdso_base, vdso_text_len, VM_READ|VM_EXEC|gp_flags| diff --git a/arch/arm64/kernel/vdso/vdso.lds.S b/arch/arm64/kernel/vdso/vdso.lds.S index 45354f2ddf706..f7d1537a689e8 100644 --- a/arch/arm64/kernel/vdso/vdso.lds.S +++ b/arch/arm64/kernel/vdso/vdso.lds.S @@ -18,9 +18,9 @@ OUTPUT_ARCH(aarch64) SECTIONS { - PROVIDE(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE); + PROVIDE(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE_MAX); #ifdef CONFIG_TIME_NS - PROVIDE(_timens_data = _vdso_data + PAGE_SIZE); + PROVIDE(_timens_data = _vdso_data + PAGE_SIZE_MAX); #endif . = VDSO_LBASE + SIZEOF_HEADERS; diff --git a/arch/arm64/kernel/vdso32-wrap.S b/arch/arm64/kernel/vdso32-wrap.S index e72ac7bc4c04f..1c6069d6c457e 100644 --- a/arch/arm64/kernel/vdso32-wrap.S +++ b/arch/arm64/kernel/vdso32-wrap.S @@ -10,10 +10,10 @@ .globl vdso32_start, vdso32_end .section .rodata - .balign PAGE_SIZE + .balign PAGE_SIZE_MAX vdso32_start: .incbin "arch/arm64/kernel/vdso32/vdso.so" - .balign PAGE_SIZE + .balign PAGE_SIZE_MAX vdso32_end: .previous diff --git a/arch/arm64/kernel/vdso32/vdso.lds.S b/arch/arm64/kernel/vdso32/vdso.lds.S index 8d95d7d35057d..c46d18a69d1ce 100644 --- a/arch/arm64/kernel/vdso32/vdso.lds.S +++ b/arch/arm64/kernel/vdso32/vdso.lds.S @@ -18,9 +18,9 @@ OUTPUT_ARCH(arm) SECTIONS { - PROVIDE_HIDDEN(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE); + PROVIDE_HIDDEN(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE_MAX); #ifdef CONFIG_TIME_NS - PROVIDE_HIDDEN(_timens_data = _vdso_data + PAGE_SIZE); + PROVIDE_HIDDEN(_timens_data = _vdso_data + PAGE_SIZE_MAX); #endif . = VDSO_LBASE + SIZEOF_HEADERS; diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index 7f3f6d709ae73..1ef6dea13b57c 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -15,16 +15,16 @@ #define HYPERVISOR_DATA_SECTIONS \ HYP_SECTION_NAME(.rodata) : { \ - . = ALIGN(PAGE_SIZE); \ + . = ALIGN(PAGE_SIZE_MAX); \ __hyp_rodata_start = .; \ *(HYP_SECTION_NAME(.data..ro_after_init)) \ *(HYP_SECTION_NAME(.rodata)) \ - . = ALIGN(PAGE_SIZE); \ + . = ALIGN(PAGE_SIZE_MAX); \ __hyp_rodata_end = .; \ } #define HYPERVISOR_PERCPU_SECTION \ - . = ALIGN(PAGE_SIZE); \ + . = ALIGN(PAGE_SIZE_MAX); \ HYP_SECTION_NAME(.data..percpu) : { \ *(HYP_SECTION_NAME(.data..percpu)) \ } @@ -39,7 +39,7 @@ #define BSS_FIRST_SECTIONS \ __hyp_bss_start = .; \ *(HYP_SECTION_NAME(.bss)) \ - . = ALIGN(PAGE_SIZE); \ + . = ALIGN(PAGE_SIZE_MAX); \ __hyp_bss_end = .; /* @@ -48,7 +48,7 @@ * between them, which can in some cases cause the linker to misalign them. To * work around the issue, force a page alignment for __bss_start. */ -#define SBSS_ALIGN PAGE_SIZE +#define SBSS_ALIGN PAGE_SIZE_MAX #else /* CONFIG_KVM */ #define HYPERVISOR_EXTABLE #define HYPERVISOR_DATA_SECTIONS @@ -75,14 +75,14 @@ ENTRY(_text) jiffies = jiffies_64; #define HYPERVISOR_TEXT \ - . = ALIGN(PAGE_SIZE); \ + . = ALIGN(PAGE_SIZE_MAX); \ __hyp_idmap_text_start = .; \ *(.hyp.idmap.text) \ __hyp_idmap_text_end = .; \ __hyp_text_start = .; \ *(.hyp.text) \ HYPERVISOR_EXTABLE \ - . = ALIGN(PAGE_SIZE); \ + . = ALIGN(PAGE_SIZE_MAX); \ __hyp_text_end = .; #define IDMAP_TEXT \ @@ -113,11 +113,11 @@ jiffies = jiffies_64; #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 #define TRAMP_TEXT \ - . = ALIGN(PAGE_SIZE); \ + . = ALIGN(PAGE_SIZE_MAX); \ __entry_tramp_text_start = .; \ *(.entry.tramp.text) \ - . = ALIGN(PAGE_SIZE); \ __entry_tramp_text_end = .; \ + . = ALIGN(PAGE_SIZE_MAX); \ *(.entry.tramp.rodata) #else #define TRAMP_TEXT @@ -187,7 +187,7 @@ SECTIONS _etext = .; /* End of text section */ /* everything from this point to __init_begin will be marked RO NX */ - RO_DATA(PAGE_SIZE) + RO_DATA(PAGE_SIZE_MAX) HYPERVISOR_DATA_SECTIONS @@ -206,22 +206,22 @@ SECTIONS HIBERNATE_TEXT KEXEC_TEXT IDMAP_TEXT - . = ALIGN(PAGE_SIZE); + . = ALIGN(PAGE_SIZE_MAX); } idmap_pg_dir = .; - . += PAGE_SIZE; + . += PAGE_SIZE_MAX; #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 tramp_pg_dir = .; - . += PAGE_SIZE; + . += PAGE_SIZE_MAX; #endif reserved_pg_dir = .; - . += PAGE_SIZE; + . += PAGE_SIZE_MAX; swapper_pg_dir = .; - . += PAGE_SIZE; + . += PAGE_SIZE_MAX; . = ALIGN(SEGMENT_ALIGN); __init_begin = .; @@ -290,7 +290,7 @@ SECTIONS _data = .; _sdata = .; - RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) + RW_DATA(L1_CACHE_BYTES, PAGE_SIZE_MAX, THREAD_ALIGN) /* * Data written with the MMU off but read with the MMU on requires @@ -317,7 +317,7 @@ SECTIONS /* start of zero-init region */ BSS_SECTION(SBSS_ALIGN, 0, 0) - . = ALIGN(PAGE_SIZE); + . = ALIGN(PAGE_SIZE_MAX); init_pg_dir = .; . += INIT_DIR_SIZE_MAX; init_pg_end = .; @@ -356,7 +356,7 @@ SECTIONS * former is page-aligned, but the latter may not be with 16K or 64K pages, so * it should also not cross a page boundary. */ -ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE, +ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= SZ_4K, "HYP init code too big") ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, "ID map text too big or misaligned") @@ -367,7 +367,7 @@ ASSERT(__hibernate_exit_text_start == swsusp_arch_suspend_exit, "Hibernate exit text does not start with swsusp_arch_suspend_exit") #endif #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 -ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE, +ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3 * SZ_4K, "Entry trampoline text too big") #endif #ifdef CONFIG_KVM diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S index f4562f417d3fc..74c7c21626270 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S +++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S @@ -21,7 +21,7 @@ SECTIONS { * .hyp..data..percpu needs to be page aligned to maintain the same * alignment for when linking into vmlinux. */ - . = ALIGN(PAGE_SIZE); + . = ALIGN(PAGE_SIZE_MAX); BEGIN_HYP_SECTION(.data..percpu) PERCPU_INPUT(L1_CACHE_BYTES) END_HYP_SECTION
Increase alignment of sections in nvhe hyp, vdso and final vmlinux image from PAGE_SIZE to PAGE_SIZE_MAX. For compile-time PAGE_SIZE, PAGE_SIZE_MAX == PAGE_SIZE so there is no change. For boot-time PAGE_SIZE, PAGE_SIZE_MAX is the largest selectable page size. For a boot-time page size build, image size is comparable to a 64K page size compile-time build. In future, it may be desirable to optimize run-time memory consumption by freeing unused padding pages when the boot-time selected page size is less than PAGE_SIZE_MAX. Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> --- ***NOTE*** Any confused maintainers may want to read the cover note here for context: https://lore.kernel.org/all/20241014105514.3206191-1-ryan.roberts@arm.com/ arch/arm64/include/asm/memory.h | 4 +-- arch/arm64/kernel/vdso-wrap.S | 4 +-- arch/arm64/kernel/vdso.c | 7 +++--- arch/arm64/kernel/vdso/vdso.lds.S | 4 +-- arch/arm64/kernel/vdso32-wrap.S | 4 +-- arch/arm64/kernel/vdso32/vdso.lds.S | 4 +-- arch/arm64/kernel/vmlinux.lds.S | 38 ++++++++++++++--------------- arch/arm64/kvm/hyp/nvhe/hyp.lds.S | 2 +- 8 files changed, 34 insertions(+), 33 deletions(-)