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| author | Juergen Gross <jgross@suse.com> | 2022-06-22 08:38:38 +0200 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2022-08-01 07:43:03 +0200 |
| commit | 251e90e7e346a23742b90e2c4db19d322e071d99 (patch) | |
| tree | c4c3477288ae1ab03b0933fbeeaff78020c1b63f /include/xen | |
| parent | a870544ca9d215449e91ebc01e35d80b23151c78 (diff) | |
| download | lwn-251e90e7e346a23742b90e2c4db19d322e071d99.tar.gz lwn-251e90e7e346a23742b90e2c4db19d322e071d99.zip | |
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.
On Arm require VIRTIO_F_ACCESS_PLATFORM for devices having been listed
in the device tree to use grants.
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@linaro.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 guest using Xen
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Link: https://lore.kernel.org/r/20220622063838.8854-4-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'include/xen')
| -rw-r--r-- | include/xen/xen-ops.h | 9 | ||||
| -rw-r--r-- | include/xen/xen.h | 8 |
2 files changed, 9 insertions, 8 deletions
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h index 80546960f8b7..dae0f350c678 100644 --- a/include/xen/xen-ops.h +++ b/include/xen/xen-ops.h @@ -5,6 +5,7 @@ #include <linux/percpu.h> #include <linux/notifier.h> #include <linux/efi.h> +#include <linux/virtio_anchor.h> #include <xen/features.h> #include <asm/xen/interface.h> #include <xen/interface/vcpu.h> @@ -217,6 +218,7 @@ static inline void xen_preemptible_hcall_end(void) { } #ifdef CONFIG_XEN_GRANT_DMA_OPS void xen_grant_setup_dma_ops(struct device *dev); bool xen_is_grant_dma_device(struct device *dev); +bool xen_virtio_mem_acc(struct virtio_device *dev); #else static inline void xen_grant_setup_dma_ops(struct device *dev) { @@ -225,6 +227,13 @@ static inline bool xen_is_grant_dma_device(struct device *dev) { return false; } + +struct virtio_device; + +static inline bool xen_virtio_mem_acc(struct virtio_device *dev) +{ + return false; +} #endif /* CONFIG_XEN_GRANT_DMA_OPS */ #endif /* INCLUDE_XEN_OPS_H */ diff --git a/include/xen/xen.h b/include/xen/xen.h index ac5a144c6a65..a99bab817523 100644 --- a/include/xen/xen.h +++ b/include/xen/xen.h @@ -52,14 +52,6 @@ bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, extern u64 xen_saved_max_mem_size; #endif -#include <linux/virtio_anchor.h> - -static inline void xen_set_restricted_virtio_memory_access(void) -{ - if (IS_ENABLED(CONFIG_XEN_VIRTIO) && xen_domain()) - virtio_set_mem_acc_cb(virtio_require_restricted_mem_acc); -} - #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); |