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vdso: Add generic architecture-specific data storage

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Some architectures need to expose architecture-specific data to the vDSO.

Enable the generic vDSO storage mechanism to both store and map this
data. Some architectures require more than a single page, like LoongArch,
so prepare for that usecase, too.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250204-vdso-store-rng-v3-7-13a4669dfc8c@linutronix.de
This commit is contained in:
Thomas Weißschuh
2025-02-04 13:05:39 +01:00
committed by Thomas Gleixner
parent 51d6ca373f
commit 365841e155
3 changed files with 43 additions and 0 deletions
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14
lib/vdso/datastore.c
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@@ -26,6 +26,14 @@ struct vdso_rng_data *vdso_k_rng_data = &vdso_rng_data_store.data;
static_assert(sizeof(vdso_rng_data_store) == PAGE_SIZE);
#endif /* CONFIG_VDSO_GETRANDOM */
#ifdef CONFIG_ARCH_HAS_VDSO_ARCH_DATA
static union {
struct vdso_arch_data data;
u8 page[VDSO_ARCH_DATA_SIZE];
} vdso_arch_data_store __page_aligned_data;
struct vdso_arch_data *vdso_k_arch_data = &vdso_arch_data_store.data;
#endif /* CONFIG_ARCH_HAS_VDSO_ARCH_DATA */
static vm_fault_t vvar_fault(const struct vm_special_mapping *sm,
struct vm_area_struct *vma, struct vm_fault *vmf)
{
@@ -67,6 +75,12 @@ static vm_fault_t vvar_fault(const struct vm_special_mapping *sm,
return VM_FAULT_SIGBUS;
pfn = __phys_to_pfn(__pa_symbol(vdso_k_rng_data));
break;
case VDSO_ARCH_PAGES_START ... VDSO_ARCH_PAGES_END:
if (!IS_ENABLED(CONFIG_ARCH_HAS_VDSO_ARCH_DATA))
return VM_FAULT_SIGBUS;
pfn = __phys_to_pfn(__pa_symbol(vdso_k_arch_data)) +
vmf->pgoff - VDSO_ARCH_PAGES_START;
break;
default:
return VM_FAULT_SIGBUS;
}