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authorJuergen Gross <jgross@suse.com>2022-06-02 22:23:48 +0300
committerJuergen Gross <jgross@suse.com>2022-06-06 08:54:52 +0200
commitd6aca3504c7ded5f4f46957e3685b9344d9743dd (patch)
tree98a7a9c3a2d41bf5244176b39f2ef5b04522950b /include/xen
parent02a9e681a3f7998074f39ec265080bf934871530 (diff)
downloadlinux-d6aca3504c7ded5f4f46957e3685b9344d9743dd.tar.bz2
xen/grant-dma-ops: Add option to restrict memory access under Xen
Introduce Xen grant DMA-mapping layer which contains special DMA-mapping routines for providing grant references as DMA addresses to be used by frontends (e.g. virtio) in Xen guests. Add the needed functionality by providing a special set of DMA ops handling the needed grant operations for the I/O pages. The subsequent commit will introduce the use case for xen-grant DMA ops layer to enable using virtio devices in Xen guests in a safe manner. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Link: https://lore.kernel.org/r/1654197833-25362-4-git-send-email-olekstysh@gmail.com Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'include/xen')
-rw-r--r--include/xen/xen-ops.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index c7c1b46ff4cd..afd586d717a4 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -214,4 +214,12 @@ static inline void xen_preemptible_hcall_end(void) { }
#endif /* CONFIG_XEN_PV && !CONFIG_PREEMPTION */
+#ifdef CONFIG_XEN_GRANT_DMA_OPS
+void xen_grant_setup_dma_ops(struct device *dev);
+#else
+static inline void xen_grant_setup_dma_ops(struct device *dev)
+{
+}
+#endif /* CONFIG_XEN_GRANT_DMA_OPS */
+
#endif /* INCLUDE_XEN_OPS_H */