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    Subject[PATCH v2 09/12] fork: Clear PASID for new mm
    Date
    When a new mm is created, its PASID should be cleared, i.e. the PASID is
    initialized to its init state 0 on both ARM and X86.

    Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
    Reviewed-by: Tony Luck <tony.luck@intel.com>
    ---
    v2:
    - Add this patch to initialize PASID value for a new mm.

    include/linux/mm_types.h | 2 ++
    kernel/fork.c | 8 ++++++++
    2 files changed, 10 insertions(+)

    diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
    index 5778db3aa42d..904bc07411a9 100644
    --- a/include/linux/mm_types.h
    +++ b/include/linux/mm_types.h
    @@ -22,6 +22,8 @@
    #endif
    #define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1))

    +/* Initial PASID value is 0. */
    +#define INIT_PASID 0

    struct address_space;
    struct mem_cgroup;
    diff --git a/kernel/fork.c b/kernel/fork.c
    index 142b23645d82..085e72d3e9eb 100644
    --- a/kernel/fork.c
    +++ b/kernel/fork.c
    @@ -1007,6 +1007,13 @@ static void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
    #endif
    }

    +static void mm_init_pasid(struct mm_struct *mm)
    +{
    +#ifdef CONFIG_PCI_PASID
    + mm->pasid = INIT_PASID;
    +#endif
    +}
    +
    static void mm_init_uprobes_state(struct mm_struct *mm)
    {
    #ifdef CONFIG_UPROBES
    @@ -1035,6 +1042,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
    mm_init_cpumask(mm);
    mm_init_aio(mm);
    mm_init_owner(mm, p);
    + mm_init_pasid(mm);
    RCU_INIT_POINTER(mm->exe_file, NULL);
    mmu_notifier_subscriptions_init(mm);
    init_tlb_flush_pending(mm);
    --
    2.19.1
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