[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v2] xen: don't require virtio with grants for non-PV guests
Commit fa1f57421e0b ("xen/virtio: Enable restricted memory access using Xen grant mappings") introduced a new requirement for using virtio devices: the backend now needs to support the VIRTIO_F_ACCESS_PLATFORM feature. This is an undue requirement for non-PV guests, as those can be operated with existing backends without any problem, as long as those backends are running in dom0. Per default allow virtio devices without grant support for non-PV guests. Add a new config item to always force use of grants for virtio. Fixes: fa1f57421e0b ("xen/virtio: Enable restricted memory access using Xen grant mappings") Reported-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx> Signed-off-by: Juergen Gross <jgross@xxxxxxxx> --- V2: - remove command line parameter (Christoph Hellwig) --- drivers/xen/Kconfig | 9 +++++++++ include/xen/xen.h | 2 +- 2 files changed, 10 insertions(+), 1 deletion(-) 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/include/xen/xen.h b/include/xen/xen.h index 0780a81e140d..4d4188f20337 100644 --- a/include/xen/xen.h +++ b/include/xen/xen.h @@ -56,7 +56,7 @@ extern u64 xen_saved_max_mem_size; static inline void xen_set_restricted_virtio_memory_access(void) { - if (IS_ENABLED(CONFIG_XEN_VIRTIO) && xen_domain()) + if (IS_ENABLED(CONFIG_XEN_VIRTIO_FORCE_GRANT) || xen_pv_domain()) platform_set(PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS); } -- 2.35.3
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