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authorJuergen Gross <jgross@suse.com>2022-06-02 22:23:49 +0300
committerJuergen Gross <jgross@suse.com>2022-06-06 16:07:30 +0200
commitfa1f57421e0b1c57843902c89728f823abc32f02 (patch)
treea7cfcba922c86058156d997e07180b269b321c34 /include/xen/xen.h
parentd6aca3504c7ded5f4f46957e3685b9344d9743dd (diff)
downloadlinux-fa1f57421e0b1c57843902c89728f823abc32f02.tar.bz2
xen/virtio: Enable restricted memory access using Xen grant mappings
In order to support virtio in Xen guests add a config option XEN_VIRTIO enabling the user to specify whether in all Xen guests virtio should be able to access memory via Xen grant mappings only on the host side. Also set PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS feature from the guest initialization code on Arm and x86 if CONFIG_XEN_VIRTIO is enabled. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Link: https://lore.kernel.org/r/1654197833-25362-5-git-send-email-olekstysh@gmail.com Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'include/xen/xen.h')
-rw-r--r--include/xen/xen.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/xen/xen.h b/include/xen/xen.h
index a99bab817523..0780a81e140d 100644
--- a/include/xen/xen.h
+++ b/include/xen/xen.h
@@ -52,6 +52,14 @@ bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
extern u64 xen_saved_max_mem_size;
#endif
+#include <linux/platform-feature.h>
+
+static inline void xen_set_restricted_virtio_memory_access(void)
+{
+ if (IS_ENABLED(CONFIG_XEN_VIRTIO) && xen_domain())
+ platform_set(PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS);
+}
+
#ifdef CONFIG_XEN_UNPOPULATED_ALLOC
int xen_alloc_unpopulated_pages(unsigned int nr_pages, struct page **pages);
void xen_free_unpopulated_pages(unsigned int nr_pages, struct page **pages);