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From:   Oleksandr Tyshchenko <olekstysh@gmail.com>
To:     xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org
Cc:     Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Juergen Gross <jgross@suse.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        Julien Grall <julien@xen.org>
Subject: [RFC PATCH 6/6] arm/xen: Assign xen-virtio DMA ops for virtio devices in Xen guests
Date:   Thu, 14 Apr 2022 22:19:33 +0300
Message-Id: <1649963973-22879-7-git-send-email-olekstysh@gmail.com>
In-Reply-To: <1649963973-22879-1-git-send-email-olekstysh@gmail.com>
References: <1649963973-22879-1-git-send-email-olekstysh@gmail.com>
Precedence: bulk

From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.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@epam.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