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 <feng...@intel.com>
Reviewed-by: Jiang Liu <jiang....@linux.intel.com>
Reviewed-by: Thomas Gleixner <t...@linutronix.de>
Acked-by: Joerg Roedel <j...@8bytes.org>
---
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 e479fbd..046c7fb 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 {
#ifdef CONFIG_IRQ_REMAP
+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 inline 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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