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From: Juergen Gross <jgross@suse.com>
To: linux-kernel@vger.kernel.org
Cc: Juergen Gross <jgross@suse.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>,
	xen-devel@lists.xenproject.org
Subject: [PATCH 2/3] xen/virtio: use dom0 as default backend for CONFIG_XEN_VIRTIO_FORCE_GRANT
Date: Thu,  6 Oct 2022 09:14:59 +0200	[thread overview]
Message-ID: <20221006071500.15689-3-jgross@suse.com> (raw)
In-Reply-To: <20221006071500.15689-1-jgross@suse.com>

With CONFIG_XEN_VIRTIO_FORCE_GRANT set the default backend domid to 0,
enabling to use xen_grant_dma_ops for those devices.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 drivers/xen/grant-dma-ops.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/xen/grant-dma-ops.c b/drivers/xen/grant-dma-ops.c
index f29759d5301f..a00112235877 100644
--- a/drivers/xen/grant-dma-ops.c
+++ b/drivers/xen/grant-dma-ops.c
@@ -349,6 +349,9 @@ void xen_grant_setup_dma_ops(struct device *dev)
 	if (dev->of_node) {
 		if (xen_dt_grant_setup_dma_ops(dev, data))
 			goto err;
+	} else if (IS_ENABLED(CONFIG_XEN_VIRTIO_FORCE_GRANT)) {
+		dev_info(dev, "Using dom0 as backend\n");
+		data->backend_domid = 0;
 	} else {
 		/* XXX ACPI device unsupported for now */
 		goto err;
-- 
2.35.3


  parent reply	other threads:[~2022-10-06  7:15 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-06  7:14 [PATCH 0/3] xen/virtio: support grant based virtio on x86 Juergen Gross
2022-10-06  7:14 ` [PATCH 1/3] xen/virtio: restructure xen grant dma setup Juergen Gross
2022-10-06 16:35   ` Oleksandr Tyshchenko
2022-10-07  0:23     ` Stefano Stabellini
2022-10-07  4:35     ` Juergen Gross
2022-10-06  7:14 ` Juergen Gross [this message]
2022-10-06 17:23   ` [PATCH 2/3] xen/virtio: use dom0 as default backend for CONFIG_XEN_VIRTIO_FORCE_GRANT Oleksandr Tyshchenko
2022-10-07  0:23     ` Stefano Stabellini
2022-10-06  7:15 ` [PATCH 3/3] xen/virtio: enable grant based virtio on x86 Juergen Gross
2022-10-06 16:04   ` Oleksandr Tyshchenko
2022-10-07  4:31     ` Juergen Gross

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