Messages in this thread Patch in this message | | | From | Andy Lutomirski <> | Subject | [RFC 02/13] x86/mm: Add INVPCID helpers | Date | Fri, 8 Jan 2016 15:15:20 -0800 |
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This adds helpers for each of the four currently-specified INVPCID modes.
Signed-off-by: Andy Lutomirski <luto@kernel.org> --- arch/x86/include/asm/tlbflush.h | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+)
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h index 6df2029405a3..20fc38d8478a 100644 --- a/arch/x86/include/asm/tlbflush.h +++ b/arch/x86/include/asm/tlbflush.h @@ -7,6 +7,47 @@ #include <asm/processor.h> #include <asm/special_insns.h> +static inline void __invpcid(unsigned long pcid, unsigned long addr, + unsigned long type) +{ + u64 desc[2] = { pcid, addr }; + + /* + * The memory clobber is because the whole point is to invalidate + * stale TLB entries and, especially if we're flushing global + * mappings, we don't want the compiler to reorder any subsequent + * memory accesses before the TLB flush. + */ + asm volatile ( + ".byte 0x66, 0x0f, 0x38, 0x82, 0x01" /* invpcid (%cx), %ax */ + : : "m" (desc), "a" (type), "c" (desc) : "memory"); +} + +/* Flush all mappings for a given pcid and addr, not including globals. */ +static inline void invpcid_flush_one(unsigned long pcid, + unsigned long addr) +{ + __invpcid(pcid, addr, 0); +} + +/* Flush all mappings for a given PCID, not including globals. */ +static inline void invpcid_flush_single_context(unsigned long pcid) +{ + __invpcid(pcid, 0, 1); +} + +/* Flush all mappings, including globals, for all PCIDs. */ +static inline void invpcid_flush_everything(void) +{ + __invpcid(0, 0, 2); +} + +/* Flush all mappings for all PCIDs except globals. */ +static inline void invpcid_flush_all_nonglobals(void) +{ + __invpcid(0, 0, 3); +} + #ifdef CONFIG_PARAVIRT #include <asm/paravirt.h> #else -- 2.5.0
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