| Message ID | 20250110-vdso-store-rng-v2-9-350c9179bbf1@linutronix.de (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | vDSO: Introduce generic data storage | expand |
On Fri, Jan 10, 2025 at 04:23:48PM +0100, Thomas Weißschuh wrote: > The generic storage implementation provides the same features as the > custom one. However it can be shared between architectures, making > maintenance easier. > > Co-developed-by: Nam Cao <namcao@linutronix.de> > Signed-off-by: Nam Cao <namcao@linutronix.de> > Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> For rv64, nommu: LD vmlinux ld.lld: error: undefined symbol: vmf_insert_pfn >>> referenced by datastore.c >>> lib/vdso/datastore.o:(vvar_fault) in archive vmlinux.a ld.lld: error: undefined symbol: _install_special_mapping >>> referenced by datastore.c >>> lib/vdso/datastore.o:(vdso_install_vvar_mapping) in archive vmlinux.a Later patches in the series don't make it build again. rv32 builds now though, so thanks for fixing that. Cheers, Conor. > --- > arch/riscv/Kconfig | 3 +- > arch/riscv/include/asm/vdso.h | 2 +- > .../include/asm/vdso/{time_data.h => arch_data.h} | 8 +- > arch/riscv/include/asm/vdso/gettimeofday.h | 14 +--- > arch/riscv/include/asm/vdso/vsyscall.h | 9 --- > arch/riscv/kernel/sys_hwprobe.c | 3 +- > arch/riscv/kernel/vdso.c | 90 +--------------------- > arch/riscv/kernel/vdso/hwprobe.c | 6 +- > arch/riscv/kernel/vdso/vdso.lds.S | 7 +- > 9 files changed, 18 insertions(+), 124 deletions(-) > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig > index d4a7ca0388c071b536df59c0eb11d55f9080c7cd..335cbbd4dddb17e5ccaa2cddaefc298cb559dbc0 100644 > --- a/arch/riscv/Kconfig > +++ b/arch/riscv/Kconfig > @@ -52,7 +52,7 @@ config RISCV > select ARCH_HAS_SYSCALL_WRAPPER > select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST > select ARCH_HAS_UBSAN > - select ARCH_HAS_VDSO_TIME_DATA > + select ARCH_HAS_VDSO_ARCH_DATA > select ARCH_KEEP_MEMBLOCK if ACPI > select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE if 64BIT && MMU > select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX > @@ -115,6 +115,7 @@ config RISCV > select GENERIC_SCHED_CLOCK > select GENERIC_SMP_IDLE_THREAD > select GENERIC_TIME_VSYSCALL if MMU && 64BIT > + select GENERIC_VDSO_DATA_STORE > select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO > select HARDIRQS_SW_RESEND > select HAS_IOPORT if MMU > diff --git a/arch/riscv/include/asm/vdso.h b/arch/riscv/include/asm/vdso.h > index f891478829a52c41e06240f67611694cc28197d9..c130d8100232cbe50e52e35eb418e354bd114cb7 100644 > --- a/arch/riscv/include/asm/vdso.h > +++ b/arch/riscv/include/asm/vdso.h > @@ -14,7 +14,7 @@ > */ > #ifdef CONFIG_MMU > > -#define __VVAR_PAGES 2 > +#define __VDSO_PAGES 4 > > #ifndef __ASSEMBLY__ > #include <generated/vdso-offsets.h> > diff --git a/arch/riscv/include/asm/vdso/time_data.h b/arch/riscv/include/asm/vdso/arch_data.h > similarity index 71% > rename from arch/riscv/include/asm/vdso/time_data.h > rename to arch/riscv/include/asm/vdso/arch_data.h > index dfa65228999bed41dfd6c5e36cb678e1e055eec8..da57a3786f7a53c866fc00948826b4a2d839940f 100644 > --- a/arch/riscv/include/asm/vdso/time_data.h > +++ b/arch/riscv/include/asm/vdso/arch_data.h > @@ -1,12 +1,12 @@ > /* SPDX-License-Identifier: GPL-2.0 */ > -#ifndef __RISCV_ASM_VDSO_TIME_DATA_H > -#define __RISCV_ASM_VDSO_TIME_DATA_H > +#ifndef __RISCV_ASM_VDSO_ARCH_DATA_H > +#define __RISCV_ASM_VDSO_ARCH_DATA_H > > #include <linux/types.h> > #include <vdso/datapage.h> > #include <asm/hwprobe.h> > > -struct arch_vdso_time_data { > +struct vdso_arch_data { > /* Stash static answers to the hwprobe queries when all CPUs are selected. */ > __u64 all_cpu_hwprobe_values[RISCV_HWPROBE_MAX_KEY + 1]; > > @@ -14,4 +14,4 @@ struct arch_vdso_time_data { > __u8 homogeneous_cpus; > }; > > -#endif /* __RISCV_ASM_VDSO_TIME_DATA_H */ > +#endif /* __RISCV_ASM_VDSO_ARCH_DATA_H */ > diff --git a/arch/riscv/include/asm/vdso/gettimeofday.h b/arch/riscv/include/asm/vdso/gettimeofday.h > index ba3283cf7accaa93a38512d2c17eda0eefde0612..29164f84f93cec6e28251e6a0adfbc341ac88241 100644 > --- a/arch/riscv/include/asm/vdso/gettimeofday.h > +++ b/arch/riscv/include/asm/vdso/gettimeofday.h > @@ -69,7 +69,7 @@ int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) > #endif /* CONFIG_GENERIC_TIME_VSYSCALL */ > > static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, > - const struct vdso_data *vd) > + const struct vdso_time_data *vd) > { > /* > * The purpose of csr_read(CSR_TIME) is to trap the system into > @@ -79,18 +79,6 @@ static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, > return csr_read(CSR_TIME); > } > > -static __always_inline const struct vdso_data *__arch_get_vdso_data(void) > -{ > - return _vdso_data; > -} > - > -#ifdef CONFIG_TIME_NS > -static __always_inline > -const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd) > -{ > - return _timens_data; > -} > -#endif > #endif /* !__ASSEMBLY__ */ > > #endif /* __ASM_VDSO_GETTIMEOFDAY_H */ > diff --git a/arch/riscv/include/asm/vdso/vsyscall.h b/arch/riscv/include/asm/vdso/vsyscall.h > index e8a9c4b53c0c9f4744196eed800b21f3918d1040..1140b54b4bc8278d7a322036cd9f84f71258f246 100644 > --- a/arch/riscv/include/asm/vdso/vsyscall.h > +++ b/arch/riscv/include/asm/vdso/vsyscall.h > @@ -6,15 +6,6 @@ > > #include <vdso/datapage.h> > > -extern struct vdso_data *vdso_data; > - > -static __always_inline struct vdso_data *__riscv_get_k_vdso_data(void) > -{ > - return vdso_data; > -} > - > -#define __arch_get_k_vdso_data __riscv_get_k_vdso_data > - > /* The asm-generic header needs to be included after the definitions above */ > #include <asm-generic/vdso/vsyscall.h> > > diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c > index cb93adfffc486e710409fd3b8a8ab22525ac4093..37e155dd3ab26da7b6a03e0b11b467e5aac51091 100644 > --- a/arch/riscv/kernel/sys_hwprobe.c > +++ b/arch/riscv/kernel/sys_hwprobe.c > @@ -445,8 +445,7 @@ static int do_riscv_hwprobe(struct riscv_hwprobe __user *pairs, > > static int __init init_hwprobe_vdso_data(void) > { > - struct vdso_data *vd = __arch_get_k_vdso_data(); > - struct arch_vdso_time_data *avd = &vd->arch_data; > + struct vdso_arch_data *avd = vdso_k_arch_data; > u64 id_bitsmash = 0; > struct riscv_hwprobe pair; > int key; > diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c > index 3ca3ae4277e187e790a8bf513a9e80d8b6290bb2..cc2895d1fbc2fe752b3edc94f4e28a6a8fca7a3b 100644 > --- a/arch/riscv/kernel/vdso.c > +++ b/arch/riscv/kernel/vdso.c > @@ -13,20 +13,11 @@ > #include <linux/err.h> > #include <asm/page.h> > #include <asm/vdso.h> > -#include <linux/time_namespace.h> > +#include <linux/vdso_datastore.h> > #include <vdso/datapage.h> > #include <vdso/vsyscall.h> > > -enum vvar_pages { > - VVAR_DATA_PAGE_OFFSET, > - VVAR_TIMENS_PAGE_OFFSET, > - VVAR_NR_PAGES, > -}; > - > -#define VVAR_SIZE (VVAR_NR_PAGES << PAGE_SHIFT) > - > -static union vdso_data_store vdso_data_store __page_aligned_data; > -struct vdso_data *vdso_data = vdso_data_store.data; > +#define VVAR_SIZE (VDSO_NR_PAGES << PAGE_SHIFT) > > struct __vdso_info { > const char *name; > @@ -79,78 +70,6 @@ static void __init __vdso_init(struct __vdso_info *vdso_info) > vdso_info->cm->pages = vdso_pagelist; > } > > -#ifdef CONFIG_TIME_NS > -struct vdso_data *arch_get_vdso_data(void *vvar_page) > -{ > - return (struct vdso_data *)(vvar_page); > -} > - > -static const struct vm_special_mapping rv_vvar_map; > - > -/* > - * The vvar mapping contains data for a specific time namespace, so when a task > - * changes namespace we must unmap its vvar data for the old namespace. > - * Subsequent faults will map in data for the new namespace. > - * > - * For more details see timens_setup_vdso_data(). > - */ > -int vdso_join_timens(struct task_struct *task, struct time_namespace *ns) > -{ > - struct mm_struct *mm = task->mm; > - struct vm_area_struct *vma; > - VMA_ITERATOR(vmi, mm, 0); > - > - mmap_read_lock(mm); > - > - for_each_vma(vmi, vma) { > - if (vma_is_special_mapping(vma, &rv_vvar_map)) > - zap_vma_pages(vma); > - } > - > - mmap_read_unlock(mm); > - return 0; > -} > -#endif > - > -static vm_fault_t vvar_fault(const struct vm_special_mapping *sm, > - struct vm_area_struct *vma, struct vm_fault *vmf) > -{ > - struct page *timens_page = find_timens_vvar_page(vma); > - unsigned long pfn; > - > - switch (vmf->pgoff) { > - case VVAR_DATA_PAGE_OFFSET: > - if (timens_page) > - pfn = page_to_pfn(timens_page); > - else > - pfn = sym_to_pfn(vdso_data); > - break; > -#ifdef CONFIG_TIME_NS > - case VVAR_TIMENS_PAGE_OFFSET: > - /* > - * If a task belongs to a time namespace then a namespace > - * specific VVAR is mapped with the VVAR_DATA_PAGE_OFFSET and > - * the real VVAR page is mapped with the VVAR_TIMENS_PAGE_OFFSET > - * offset. > - * See also the comment near timens_setup_vdso_data(). > - */ > - if (!timens_page) > - return VM_FAULT_SIGBUS; > - pfn = sym_to_pfn(vdso_data); > - break; > -#endif /* CONFIG_TIME_NS */ > - default: > - return VM_FAULT_SIGBUS; > - } > - > - return vmf_insert_pfn(vma, vmf->address, pfn); > -} > - > -static const struct vm_special_mapping rv_vvar_map = { > - .name = "[vvar]", > - .fault = vvar_fault, > -}; > - > static struct vm_special_mapping rv_vdso_map __ro_after_init = { > .name = "[vdso]", > .mremap = vdso_mremap, > @@ -196,7 +115,7 @@ static int __setup_additional_pages(struct mm_struct *mm, > unsigned long vdso_base, vdso_text_len, vdso_mapping_len; > void *ret; > > - BUILD_BUG_ON(VVAR_NR_PAGES != __VVAR_PAGES); > + BUILD_BUG_ON(VDSO_NR_PAGES != __VDSO_PAGES); > > vdso_text_len = vdso_info->vdso_pages << PAGE_SHIFT; > /* Be sure to map the data page */ > @@ -208,8 +127,7 @@ static int __setup_additional_pages(struct mm_struct *mm, > goto up_fail; > } > > - ret = _install_special_mapping(mm, vdso_base, VVAR_SIZE, > - (VM_READ | VM_MAYREAD | VM_PFNMAP), &rv_vvar_map); > + ret = vdso_install_vvar_mapping(mm, vdso_base); > if (IS_ERR(ret)) > goto up_fail; > > diff --git a/arch/riscv/kernel/vdso/hwprobe.c b/arch/riscv/kernel/vdso/hwprobe.c > index a158c029344f60c022e7565757ff44df7e3d89e5..2ddeba6c68dda09b0249117fd06a5d249f3b0abd 100644 > --- a/arch/riscv/kernel/vdso/hwprobe.c > +++ b/arch/riscv/kernel/vdso/hwprobe.c > @@ -16,8 +16,7 @@ static int riscv_vdso_get_values(struct riscv_hwprobe *pairs, size_t pair_count, > size_t cpusetsize, unsigned long *cpus, > unsigned int flags) > { > - const struct vdso_data *vd = __arch_get_vdso_data(); > - const struct arch_vdso_time_data *avd = &vd->arch_data; > + const struct vdso_arch_data *avd = &vdso_u_arch_data; > bool all_cpus = !cpusetsize && !cpus; > struct riscv_hwprobe *p = pairs; > struct riscv_hwprobe *end = pairs + pair_count; > @@ -51,8 +50,7 @@ static int riscv_vdso_get_cpus(struct riscv_hwprobe *pairs, size_t pair_count, > size_t cpusetsize, unsigned long *cpus, > unsigned int flags) > { > - const struct vdso_data *vd = __arch_get_vdso_data(); > - const struct arch_vdso_time_data *avd = &vd->arch_data; > + const struct vdso_arch_data *avd = &vdso_u_arch_data; > struct riscv_hwprobe *p = pairs; > struct riscv_hwprobe *end = pairs + pair_count; > unsigned char *c = (unsigned char *)cpus; > diff --git a/arch/riscv/kernel/vdso/vdso.lds.S b/arch/riscv/kernel/vdso/vdso.lds.S > index cbe2a179331d2511a8b4a26c06383e46131661b1..8e86965a8aae4d7c5a36d0f26026cd1c8680b339 100644 > --- a/arch/riscv/kernel/vdso/vdso.lds.S > +++ b/arch/riscv/kernel/vdso/vdso.lds.S > @@ -4,15 +4,14 @@ > */ > #include <asm/page.h> > #include <asm/vdso.h> > +#include <vdso/datapage.h> > > OUTPUT_ARCH(riscv) > > SECTIONS > { > - PROVIDE(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE); > -#ifdef CONFIG_TIME_NS > - PROVIDE(_timens_data = _vdso_data + PAGE_SIZE); > -#endif > + VDSO_VVAR_SYMS > + > . = SIZEOF_HEADERS; > > .hash : { *(.hash) } :text > > -- > 2.47.1 >
On Mon, Jan 13, 2025 at 07:48:15PM +0000, Conor Dooley wrote: > On Fri, Jan 10, 2025 at 04:23:48PM +0100, Thomas Weißschuh wrote: > > The generic storage implementation provides the same features as the > > custom one. However it can be shared between architectures, making > > maintenance easier. > > > > Co-developed-by: Nam Cao <namcao@linutronix.de> > > Signed-off-by: Nam Cao <namcao@linutronix.de> > > Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> > > For rv64, nommu: > LD vmlinux > ld.lld: error: undefined symbol: vmf_insert_pfn > >>> referenced by datastore.c > >>> lib/vdso/datastore.o:(vvar_fault) in archive vmlinux.a > > ld.lld: error: undefined symbol: _install_special_mapping > >>> referenced by datastore.c > >>> lib/vdso/datastore.o:(vdso_install_vvar_mapping) in archive vmlinux.a > > Later patches in the series don't make it build again. > rv32 builds now though, so thanks for fixing that. Thanks for the report. Can you try to diff below? I'm adding rv64 and arm nommu configs to my test matrix and doublechecking all kconfig dependencies. diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 335cbbd4dddb..583c55910612 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -52,7 +52,7 @@ config RISCV select ARCH_HAS_SYSCALL_WRAPPER select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_UBSAN - select ARCH_HAS_VDSO_ARCH_DATA + select ARCH_HAS_VDSO_ARCH_DATA if GENERIC_VDSO_DATA_STORE select ARCH_KEEP_MEMBLOCK if ACPI select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE if 64BIT && MMU select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX @@ -115,7 +115,7 @@ config RISCV select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD select GENERIC_TIME_VSYSCALL if MMU && 64BIT - select GENERIC_VDSO_DATA_STORE + select GENERIC_VDSO_DATA_STORE if MMU select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO select HARDIRQS_SW_RESEND select HAS_IOPORT if MMU
On Tue, Jan 14, 2025 at 09:40:11AM +0100, Thomas Weißschuh wrote: > On Mon, Jan 13, 2025 at 07:48:15PM +0000, Conor Dooley wrote: > > On Fri, Jan 10, 2025 at 04:23:48PM +0100, Thomas Weißschuh wrote: > > > The generic storage implementation provides the same features as the > > > custom one. However it can be shared between architectures, making > > > maintenance easier. > > > > > > Co-developed-by: Nam Cao <namcao@linutronix.de> > > > Signed-off-by: Nam Cao <namcao@linutronix.de> > > > Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> > > > > For rv64, nommu: > > LD vmlinux > > ld.lld: error: undefined symbol: vmf_insert_pfn > > >>> referenced by datastore.c > > >>> lib/vdso/datastore.o:(vvar_fault) in archive vmlinux.a > > > > ld.lld: error: undefined symbol: _install_special_mapping > > >>> referenced by datastore.c > > >>> lib/vdso/datastore.o:(vdso_install_vvar_mapping) in archive vmlinux.a > > > > Later patches in the series don't make it build again. > > rv32 builds now though, so thanks for fixing that. > > Thanks for the report. > Can you try to diff below? Ye, that resolved it. Thanks!
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index d4a7ca0388c071b536df59c0eb11d55f9080c7cd..335cbbd4dddb17e5ccaa2cddaefc298cb559dbc0 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -52,7 +52,7 @@ config RISCV select ARCH_HAS_SYSCALL_WRAPPER select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_UBSAN - select ARCH_HAS_VDSO_TIME_DATA + select ARCH_HAS_VDSO_ARCH_DATA select ARCH_KEEP_MEMBLOCK if ACPI select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE if 64BIT && MMU select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX @@ -115,6 +115,7 @@ config RISCV select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD select GENERIC_TIME_VSYSCALL if MMU && 64BIT + select GENERIC_VDSO_DATA_STORE select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO select HARDIRQS_SW_RESEND select HAS_IOPORT if MMU diff --git a/arch/riscv/include/asm/vdso.h b/arch/riscv/include/asm/vdso.h index f891478829a52c41e06240f67611694cc28197d9..c130d8100232cbe50e52e35eb418e354bd114cb7 100644 --- a/arch/riscv/include/asm/vdso.h +++ b/arch/riscv/include/asm/vdso.h @@ -14,7 +14,7 @@ */ #ifdef CONFIG_MMU -#define __VVAR_PAGES 2 +#define __VDSO_PAGES 4 #ifndef __ASSEMBLY__ #include <generated/vdso-offsets.h> diff --git a/arch/riscv/include/asm/vdso/time_data.h b/arch/riscv/include/asm/vdso/arch_data.h similarity index 71% rename from arch/riscv/include/asm/vdso/time_data.h rename to arch/riscv/include/asm/vdso/arch_data.h index dfa65228999bed41dfd6c5e36cb678e1e055eec8..da57a3786f7a53c866fc00948826b4a2d839940f 100644 --- a/arch/riscv/include/asm/vdso/time_data.h +++ b/arch/riscv/include/asm/vdso/arch_data.h @@ -1,12 +1,12 @@ /* SPDX-License-Identifier: GPL-2.0 */ -#ifndef __RISCV_ASM_VDSO_TIME_DATA_H -#define __RISCV_ASM_VDSO_TIME_DATA_H +#ifndef __RISCV_ASM_VDSO_ARCH_DATA_H +#define __RISCV_ASM_VDSO_ARCH_DATA_H #include <linux/types.h> #include <vdso/datapage.h> #include <asm/hwprobe.h> -struct arch_vdso_time_data { +struct vdso_arch_data { /* Stash static answers to the hwprobe queries when all CPUs are selected. */ __u64 all_cpu_hwprobe_values[RISCV_HWPROBE_MAX_KEY + 1]; @@ -14,4 +14,4 @@ struct arch_vdso_time_data { __u8 homogeneous_cpus; }; -#endif /* __RISCV_ASM_VDSO_TIME_DATA_H */ +#endif /* __RISCV_ASM_VDSO_ARCH_DATA_H */ diff --git a/arch/riscv/include/asm/vdso/gettimeofday.h b/arch/riscv/include/asm/vdso/gettimeofday.h index ba3283cf7accaa93a38512d2c17eda0eefde0612..29164f84f93cec6e28251e6a0adfbc341ac88241 100644 --- a/arch/riscv/include/asm/vdso/gettimeofday.h +++ b/arch/riscv/include/asm/vdso/gettimeofday.h @@ -69,7 +69,7 @@ int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) #endif /* CONFIG_GENERIC_TIME_VSYSCALL */ static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, - const struct vdso_data *vd) + const struct vdso_time_data *vd) { /* * The purpose of csr_read(CSR_TIME) is to trap the system into @@ -79,18 +79,6 @@ static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, return csr_read(CSR_TIME); } -static __always_inline const struct vdso_data *__arch_get_vdso_data(void) -{ - return _vdso_data; -} - -#ifdef CONFIG_TIME_NS -static __always_inline -const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd) -{ - return _timens_data; -} -#endif #endif /* !__ASSEMBLY__ */ #endif /* __ASM_VDSO_GETTIMEOFDAY_H */ diff --git a/arch/riscv/include/asm/vdso/vsyscall.h b/arch/riscv/include/asm/vdso/vsyscall.h index e8a9c4b53c0c9f4744196eed800b21f3918d1040..1140b54b4bc8278d7a322036cd9f84f71258f246 100644 --- a/arch/riscv/include/asm/vdso/vsyscall.h +++ b/arch/riscv/include/asm/vdso/vsyscall.h @@ -6,15 +6,6 @@ #include <vdso/datapage.h> -extern struct vdso_data *vdso_data; - -static __always_inline struct vdso_data *__riscv_get_k_vdso_data(void) -{ - return vdso_data; -} - -#define __arch_get_k_vdso_data __riscv_get_k_vdso_data - /* The asm-generic header needs to be included after the definitions above */ #include <asm-generic/vdso/vsyscall.h> diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c index cb93adfffc486e710409fd3b8a8ab22525ac4093..37e155dd3ab26da7b6a03e0b11b467e5aac51091 100644 --- a/arch/riscv/kernel/sys_hwprobe.c +++ b/arch/riscv/kernel/sys_hwprobe.c @@ -445,8 +445,7 @@ static int do_riscv_hwprobe(struct riscv_hwprobe __user *pairs, static int __init init_hwprobe_vdso_data(void) { - struct vdso_data *vd = __arch_get_k_vdso_data(); - struct arch_vdso_time_data *avd = &vd->arch_data; + struct vdso_arch_data *avd = vdso_k_arch_data; u64 id_bitsmash = 0; struct riscv_hwprobe pair; int key; diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c index 3ca3ae4277e187e790a8bf513a9e80d8b6290bb2..cc2895d1fbc2fe752b3edc94f4e28a6a8fca7a3b 100644 --- a/arch/riscv/kernel/vdso.c +++ b/arch/riscv/kernel/vdso.c @@ -13,20 +13,11 @@ #include <linux/err.h> #include <asm/page.h> #include <asm/vdso.h> -#include <linux/time_namespace.h> +#include <linux/vdso_datastore.h> #include <vdso/datapage.h> #include <vdso/vsyscall.h> -enum vvar_pages { - VVAR_DATA_PAGE_OFFSET, - VVAR_TIMENS_PAGE_OFFSET, - VVAR_NR_PAGES, -}; - -#define VVAR_SIZE (VVAR_NR_PAGES << PAGE_SHIFT) - -static union vdso_data_store vdso_data_store __page_aligned_data; -struct vdso_data *vdso_data = vdso_data_store.data; +#define VVAR_SIZE (VDSO_NR_PAGES << PAGE_SHIFT) struct __vdso_info { const char *name; @@ -79,78 +70,6 @@ static void __init __vdso_init(struct __vdso_info *vdso_info) vdso_info->cm->pages = vdso_pagelist; } -#ifdef CONFIG_TIME_NS -struct vdso_data *arch_get_vdso_data(void *vvar_page) -{ - return (struct vdso_data *)(vvar_page); -} - -static const struct vm_special_mapping rv_vvar_map; - -/* - * The vvar mapping contains data for a specific time namespace, so when a task - * changes namespace we must unmap its vvar data for the old namespace. - * Subsequent faults will map in data for the new namespace. - * - * For more details see timens_setup_vdso_data(). - */ -int vdso_join_timens(struct task_struct *task, struct time_namespace *ns) -{ - struct mm_struct *mm = task->mm; - struct vm_area_struct *vma; - VMA_ITERATOR(vmi, mm, 0); - - mmap_read_lock(mm); - - for_each_vma(vmi, vma) { - if (vma_is_special_mapping(vma, &rv_vvar_map)) - zap_vma_pages(vma); - } - - mmap_read_unlock(mm); - return 0; -} -#endif - -static vm_fault_t vvar_fault(const struct vm_special_mapping *sm, - struct vm_area_struct *vma, struct vm_fault *vmf) -{ - struct page *timens_page = find_timens_vvar_page(vma); - unsigned long pfn; - - switch (vmf->pgoff) { - case VVAR_DATA_PAGE_OFFSET: - if (timens_page) - pfn = page_to_pfn(timens_page); - else - pfn = sym_to_pfn(vdso_data); - break; -#ifdef CONFIG_TIME_NS - case VVAR_TIMENS_PAGE_OFFSET: - /* - * If a task belongs to a time namespace then a namespace - * specific VVAR is mapped with the VVAR_DATA_PAGE_OFFSET and - * the real VVAR page is mapped with the VVAR_TIMENS_PAGE_OFFSET - * offset. - * See also the comment near timens_setup_vdso_data(). - */ - if (!timens_page) - return VM_FAULT_SIGBUS; - pfn = sym_to_pfn(vdso_data); - break; -#endif /* CONFIG_TIME_NS */ - default: - return VM_FAULT_SIGBUS; - } - - return vmf_insert_pfn(vma, vmf->address, pfn); -} - -static const struct vm_special_mapping rv_vvar_map = { - .name = "[vvar]", - .fault = vvar_fault, -}; - static struct vm_special_mapping rv_vdso_map __ro_after_init = { .name = "[vdso]", .mremap = vdso_mremap, @@ -196,7 +115,7 @@ static int __setup_additional_pages(struct mm_struct *mm, unsigned long vdso_base, vdso_text_len, vdso_mapping_len; void *ret; - BUILD_BUG_ON(VVAR_NR_PAGES != __VVAR_PAGES); + BUILD_BUG_ON(VDSO_NR_PAGES != __VDSO_PAGES); vdso_text_len = vdso_info->vdso_pages << PAGE_SHIFT; /* Be sure to map the data page */ @@ -208,8 +127,7 @@ static int __setup_additional_pages(struct mm_struct *mm, goto up_fail; } - ret = _install_special_mapping(mm, vdso_base, VVAR_SIZE, - (VM_READ | VM_MAYREAD | VM_PFNMAP), &rv_vvar_map); + ret = vdso_install_vvar_mapping(mm, vdso_base); if (IS_ERR(ret)) goto up_fail; diff --git a/arch/riscv/kernel/vdso/hwprobe.c b/arch/riscv/kernel/vdso/hwprobe.c index a158c029344f60c022e7565757ff44df7e3d89e5..2ddeba6c68dda09b0249117fd06a5d249f3b0abd 100644 --- a/arch/riscv/kernel/vdso/hwprobe.c +++ b/arch/riscv/kernel/vdso/hwprobe.c @@ -16,8 +16,7 @@ static int riscv_vdso_get_values(struct riscv_hwprobe *pairs, size_t pair_count, size_t cpusetsize, unsigned long *cpus, unsigned int flags) { - const struct vdso_data *vd = __arch_get_vdso_data(); - const struct arch_vdso_time_data *avd = &vd->arch_data; + const struct vdso_arch_data *avd = &vdso_u_arch_data; bool all_cpus = !cpusetsize && !cpus; struct riscv_hwprobe *p = pairs; struct riscv_hwprobe *end = pairs + pair_count; @@ -51,8 +50,7 @@ static int riscv_vdso_get_cpus(struct riscv_hwprobe *pairs, size_t pair_count, size_t cpusetsize, unsigned long *cpus, unsigned int flags) { - const struct vdso_data *vd = __arch_get_vdso_data(); - const struct arch_vdso_time_data *avd = &vd->arch_data; + const struct vdso_arch_data *avd = &vdso_u_arch_data; struct riscv_hwprobe *p = pairs; struct riscv_hwprobe *end = pairs + pair_count; unsigned char *c = (unsigned char *)cpus; diff --git a/arch/riscv/kernel/vdso/vdso.lds.S b/arch/riscv/kernel/vdso/vdso.lds.S index cbe2a179331d2511a8b4a26c06383e46131661b1..8e86965a8aae4d7c5a36d0f26026cd1c8680b339 100644 --- a/arch/riscv/kernel/vdso/vdso.lds.S +++ b/arch/riscv/kernel/vdso/vdso.lds.S @@ -4,15 +4,14 @@ */ #include <asm/page.h> #include <asm/vdso.h> +#include <vdso/datapage.h> OUTPUT_ARCH(riscv) SECTIONS { - PROVIDE(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE); -#ifdef CONFIG_TIME_NS - PROVIDE(_timens_data = _vdso_data + PAGE_SIZE); -#endif + VDSO_VVAR_SYMS + . = SIZEOF_HEADERS; .hash : { *(.hash) } :text