A guest can call dma_ops->is_pv_device() to find out
if a device is a passthrough'ed device (device passed
on to a guest by the host). If this is true, a hypercall
will be made to translate DMA mapping operations.
This function can be done away with and just a
kvm_is_pv_device() call can be added, which can be no-op
on a non-pv guest (or on the host).
Signed-off-by: Amit Shah <[email protected]>
---
include/asm-x86/dma-mapping_64.h | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/include/asm-x86/dma-mapping_64.h b/include/asm-x86/dma-mapping_64.h
index ecd0f61..3943edd 100644
--- a/include/asm-x86/dma-mapping_64.h
+++ b/include/asm-x86/dma-mapping_64.h
@@ -48,6 +48,8 @@ struct dma_mapping_ops {
int direction);
int (*dma_supported)(struct device *hwdev, u64 mask);
int is_phys;
+ /* Is this a physical device in a paravirtualized guest? */
+ int (*is_pv_device)(struct device *hwdev, const char *name);
};
extern dma_addr_t bad_dma_address;
--
1.5.3
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