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iommu, x86: Provide irq_remapping_cap() interface

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Add a new interface irq_remapping_cap() to detect whether irq
remapping supports new features, such as VT-d Posted-Interrupts.

Export the function, so that KVM code can check this and use this
mechanism properly.

Signed-off-by: Feng Wu <[email protected]>
Reviewed-by: Jiang Liu <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
Acked-by: Joerg Roedel <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Feng Wu 2015-06-09 13:20:36 +08:00 • committed by Thomas Gleixner
commit 959c870f73
2 changed files with 11 additions and 0 deletions
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9
drivers/iommu/irq_remapping.c
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@ -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)