virtiofs: set up virtio_fs dax_device

Setup a dax device. Use the shm capability to find the cache entry and map it. The DAX window is accessed by the fs/dax.c infrastructure and must have struct pages (at least on x86). Use devm_memremap_pages() to map the DAX window PCI BAR and allocate struct page.

Stefan Hajnoczi committed 6 years ago

Commit 22f37871 parent f4fd4ae2 files · +141 −0Browse files

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include/uapi/linux/virtio_fs.h+3−0

@@ -16,4 +16,7 @@ struct virtio_fs_config { · 15 unmodified lines
16	__le32 num_request_queues;	16	__le32 num_request_queues;
17	} __attribute__((packed));	17	} __attribute__((packed));
18		18
		19	/* For the id field in virtio_pci_shm_cap */
		20	#define VIRTIO_FS_SHMCAP_ID_CACHE 0
		21
19	#endif /* _UAPI_LINUX_VIRTIO_FS_H */	22	#endif /* _UAPI_LINUX_VIRTIO_FS_H */