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    Subject[v8 8/9] iommu, x86: define irq_remapping_cap()
    Date
    This patch adds a new interface irq_remapping_cap() to detect
    whether irq remapping supports new features, such as VT-d
    Posted-Interrupts. We export this function out, so that KVM
    code can check this and use this mechanism properly.

    Signed-off-by: Feng Wu <feng.wu@intel.com>
    Reviewed-by: Jiang Liu <jiang.liu@linux.intel.com>
    ---
    arch/x86/include/asm/irq_remapping.h | 2 ++
    drivers/iommu/irq_remapping.c | 9 +++++++++
    2 files changed, 11 insertions(+)

    diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
    index 202e040..61aa8ad 100644
    --- a/arch/x86/include/asm/irq_remapping.h
    +++ b/arch/x86/include/asm/irq_remapping.h
    @@ -35,6 +35,7 @@ enum irq_remap_cap {
    IRQ_POSTING_CAP = 0,
    };

    +extern bool irq_remapping_cap(enum irq_remap_cap cap);
    extern void set_irq_remapping_broken(void);
    extern int irq_remapping_prepare(void);
    extern int irq_remapping_enable(void);
    @@ -64,6 +65,7 @@ struct vcpu_data {

    #else /* CONFIG_IRQ_REMAP */

    +static bool irq_remapping_cap(enum irq_remap_cap cap) { return 0; }
    static inline void set_irq_remapping_broken(void) { }
    static inline int irq_remapping_prepare(void) { return -ENODEV; }
    static inline int irq_remapping_enable(void) { return -ENODEV; }
    diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
    index ed605a9..2d99930 100644
    --- a/drivers/iommu/irq_remapping.c
    +++ b/drivers/iommu/irq_remapping.c
    @@ -81,6 +81,15 @@ void set_irq_remapping_broken(void)
    irq_remap_broken = 1;
    }

    +bool irq_remapping_cap(enum irq_remap_cap cap)
    +{
    + if (!remap_ops || disable_irq_post)
    + return 0;
    +
    + return (remap_ops->capability & (1 << cap));
    +}
    +EXPORT_SYMBOL_GPL(irq_remapping_cap);
    +
    int __init irq_remapping_prepare(void)
    {
    if (disable_irq_remap)
    --
    2.1.0


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