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    Subject[RFC 02/13] x86/mm: Add INVPCID helpers
    Date
    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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