[PATCH V1 6/6] arm/xen: Assign xen-grant DMA ops for xen-grant DMA devices
Oleksandr Tyshchenko
olekstysh at gmail.com
Fri Apr 22 09:51:03 PDT 2022
From: Oleksandr Tyshchenko <oleksandr_tyshchenko at epam.com>
As the main (and single at the moment) purpose of xen-grant
DMA devices is to enable using virtio devices in Xen guests
in a safe manner, assign xen-grant DMA ops only if restricted
access to the guest memory is enabled.
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko at epam.com>
---
Changes RFC -> V1:
- update commit subject/description
- remove #ifdef CONFIG_XEN_VIRTIO
- re-organize the check taking into the account that
swiotlb and virtio cases are mutually exclusive
- update according to the new naming scheme:
s/virtio/grant_dma
---
include/xen/arm/xen-ops.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/include/xen/arm/xen-ops.h b/include/xen/arm/xen-ops.h
index 288deb1..26954e5 100644
--- a/include/xen/arm/xen-ops.h
+++ b/include/xen/arm/xen-ops.h
@@ -2,12 +2,17 @@
#ifndef _ASM_ARM_XEN_OPS_H
#define _ASM_ARM_XEN_OPS_H
+#include <linux/virtio_config.h>
#include <xen/swiotlb-xen.h>
+#include <xen/xen-ops.h>
static inline void xen_setup_dma_ops(struct device *dev)
{
#ifdef CONFIG_XEN
- if (xen_swiotlb_detect())
+ if (arch_has_restricted_virtio_memory_access() &&
+ xen_is_grant_dma_device(dev))
+ xen_grant_setup_dma_ops(dev);
+ else if (xen_swiotlb_detect())
dev->dma_ops = &xen_swiotlb_dma_ops;
#endif
}
--
2.7.4
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