Merge tag 'for-linus-6.0-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen updates from Juergen Gross:

 - a series fine tuning virtio support for Xen guests, including removal
   the now again unused "platform_has()" feature.

 - a fix for host admin triggered reboot of Xen guests

 - a simple spelling fix

* tag 'for-linus-6.0-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen: don't require virtio with grants for non-PV guests
  kernel: remove platform_has() infrastructure
  virtio: replace restricted mem access flag with callback
  xen: Fix spelling mistake
  xen/manage: Use orderly_reboot() to reboot

4 files changed, 22 insertions, 3 deletions

diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index bfd5f4f706bc..a65bd92121a5 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -355,4 +355,13 @@ config XEN_VIRTIO
 
 	  If in doubt, say n.
 
+config XEN_VIRTIO_FORCE_GRANT
+	bool "Require Xen virtio support to use grants"
+	depends on XEN_VIRTIO
+	help
+	  Require virtio for Xen guests to use grant mappings.
+	  This will avoid the need to give the backend the right to map all
+	  of the guest memory. This will need support on the backend side
+	  (e.g. qemu or kernel, depending on the virtio device types used).
+
 endmenu
diff --git a/drivers/xen/grant-dma-ops.c b/drivers/xen/grant-dma-ops.c
index fc0142484001..8973fc1e9ccc 100644
--- a/drivers/xen/grant-dma-ops.c
+++ b/drivers/xen/grant-dma-ops.c
@@ -12,6 +12,8 @@
 #include <linux/of.h>
 #include <linux/pfn.h>
 #include <linux/xarray.h>
+#include <linux/virtio_anchor.h>
+#include <linux/virtio.h>
 #include <xen/xen.h>
 #include <xen/xen-ops.h>
 #include <xen/grant_table.h>
@@ -287,6 +289,14 @@ bool xen_is_grant_dma_device(struct device *dev)
 	return has_iommu;
 }
 
+bool xen_virtio_mem_acc(struct virtio_device *dev)
+{
+	if (IS_ENABLED(CONFIG_XEN_VIRTIO_FORCE_GRANT))
+		return true;
+
+	return xen_is_grant_dma_device(dev->dev.parent);
+}
+
 void xen_grant_setup_dma_ops(struct device *dev)
 {
 	struct xen_grant_dma_data *data;
diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index 3d5a384d65f7..c16df629907e 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -205,7 +205,7 @@ static void do_poweroff(void)
 static void do_reboot(void)
 {
 	shutting_down = SHUTDOWN_POWEROFF; /* ? */
-	ctrl_alt_del();
+	orderly_reboot();
 }
 
 static struct shutdown_handler shutdown_handlers[] = {
diff --git a/drivers/xen/xen-front-pgdir-shbuf.c b/drivers/xen/xen-front-pgdir-shbuf.c
index bef8d72a6ca6..5c0b5cb5b419 100644
--- a/drivers/xen/xen-front-pgdir-shbuf.c
+++ b/drivers/xen/xen-front-pgdir-shbuf.c
@@ -89,7 +89,7 @@ EXPORT_SYMBOL_GPL(xen_front_pgdir_shbuf_get_dir_start);
  * shared by the frontend itself) or map the provided granted
  * references onto the backing storage (buf->pages).
  *
- * \param buf shared buffer which grants to be maped.
+ * \param buf shared buffer which grants to be mapped.
  * \return zero on success or a negative number on failure.
  */
 int xen_front_pgdir_shbuf_map(struct xen_front_pgdir_shbuf *buf)
@@ -110,7 +110,7 @@ EXPORT_SYMBOL_GPL(xen_front_pgdir_shbuf_map);
  * shared by the frontend itself) or unmap the provided granted
  * references.
  *
- * \param buf shared buffer which grants to be unmaped.
+ * \param buf shared buffer which grants to be unmapped.
  * \return zero on success or a negative number on failure.
  */
 int xen_front_pgdir_shbuf_unmap(struct xen_front_pgdir_shbuf *buf)