diff options
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/io.h | 4 | ||||
| -rw-r--r-- | arch/x86/include/asm/tlbflush.h | 21 |
2 files changed, 19 insertions, 6 deletions
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index c40a95c33bb8..322d25ae23ab 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -110,6 +110,10 @@ build_mmio_write(__writeq, "q", unsigned long, "r", ) #endif +#define ARCH_HAS_VALID_PHYS_ADDR_RANGE +extern int valid_phys_addr_range(phys_addr_t addr, size_t size); +extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size); + /** * virt_to_phys - map virtual addresses to physical * @address: address to remap diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h index d362161d3291..c4aed0de565e 100644 --- a/arch/x86/include/asm/tlbflush.h +++ b/arch/x86/include/asm/tlbflush.h @@ -82,12 +82,21 @@ static inline u64 inc_mm_tlb_gen(struct mm_struct *mm) #define __flush_tlb_single(addr) __native_flush_tlb_single(addr) #endif -/* - * If tlb_use_lazy_mode is true, then we try to avoid switching CR3 to point - * to init_mm when we switch to a kernel thread (e.g. the idle thread). If - * it's false, then we immediately switch CR3 when entering a kernel thread. - */ -DECLARE_STATIC_KEY_TRUE(tlb_use_lazy_mode); +static inline bool tlb_defer_switch_to_init_mm(void) +{ + /* + * If we have PCID, then switching to init_mm is reasonably + * fast. If we don't have PCID, then switching to init_mm is + * quite slow, so we try to defer it in the hopes that we can + * avoid it entirely. The latter approach runs the risk of + * receiving otherwise unnecessary IPIs. + * + * This choice is just a heuristic. The tlb code can handle this + * function returning true or false regardless of whether we have + * PCID. + */ + return !static_cpu_has(X86_FEATURE_PCID); +} /* * 6 because 6 should be plenty and struct tlb_state will fit in |