linux-kernel - [RFC PATCH 6/6] arm/xen: Assign xen-virtio DMA ops for virtio devices in Xen guests

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Date:   Thu, 14 Apr 2022 22:19:33 +0300
From:   Oleksandr Tyshchenko <olekstysh@...il.com>
To:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Julien Grall <julien@....org>
Subject: [RFC PATCH 6/6] arm/xen: Assign xen-virtio DMA ops for virtio devices in Xen guests

From: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>

Call xen_virtio_setup_dma_ops() only for Xen-aware virtio devices
in Xen guests if restricted access to the guest memory is enabled.

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
---
 include/xen/arm/xen-ops.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/xen/arm/xen-ops.h b/include/xen/arm/xen-ops.h
index 621da05..28b2ad3 100644
--- a/include/xen/arm/xen-ops.h
+++ b/include/xen/arm/xen-ops.h
@@ -2,12 +2,19 @@
 #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)
 {
 	if (xen_swiotlb_detect())
 		dev->dma_ops = &xen_swiotlb_dma_ops;
+
+#ifdef CONFIG_XEN_VIRTIO
+	if (arch_has_restricted_virtio_memory_access() && xen_is_virtio_device(dev))
+		xen_virtio_setup_dma_ops(dev);
+#endif
 }
 
 #endif /* _ASM_ARM_XEN_OPS_H */
-- 
2.7.4