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| author |   Juergen Gross <jgross@suse.com> | 2022-06-02 22:23:48 +0300 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2022-06-06 08:54:52 +0200 |
| commit | d6aca3504c7ded5f4f46957e3685b9344d9743dd (patch) | |
| tree | 98a7a9c3a2d41bf5244176b39f2ef5b04522950b /include/xen | |
| parent | xen/grants: support allocating consecutive grants (diff) | |
| download | linux-dev-d6aca3504c7ded5f4f46957e3685b9344d9743dd.tar.xz linux-dev-d6aca3504c7ded5f4f46957e3685b9344d9743dd.zip | |
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.h | 8 |
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 */ |