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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>
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5 changed files with 25 additions and 0 deletions
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@ -443,6 +443,8 @@ static int __init xen_guest_init(void)
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if (!xen_domain())
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return 0;
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xen_set_restricted_virtio_memory_access();
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if (!acpi_disabled)
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xen_acpi_guest_init();
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else
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@ -195,6 +195,8 @@ static void __init xen_hvm_guest_init(void)
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if (xen_pv_domain())
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return;
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xen_set_restricted_virtio_memory_access();
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init_hvm_pv_info();
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reserve_shared_info();
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@ -109,6 +109,8 @@ static DEFINE_PER_CPU(struct tls_descs, shadow_tls_desc);
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static void __init xen_pv_init_platform(void)
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{
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xen_set_restricted_virtio_memory_access();
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populate_extra_pte(fix_to_virt(FIX_PARAVIRT_BOOTMAP));
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set_fixmap(FIX_PARAVIRT_BOOTMAP, xen_start_info->shared_info);
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@ -339,4 +339,15 @@ config XEN_GRANT_DMA_OPS
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bool
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select DMA_OPS
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config XEN_VIRTIO
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bool "Xen virtio support"
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depends on VIRTIO
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select XEN_GRANT_DMA_OPS
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help
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Enable virtio support for running as Xen guest. Depending on the
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guest type this will require special support on the backend side
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(qemu or kernel, depending on the virtio device types used).
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If in doubt, say n.
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endmenu
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@ -52,6 +52,14 @@ bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
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extern u64 xen_saved_max_mem_size;
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#endif
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#include <linux/platform-feature.h>
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static inline void xen_set_restricted_virtio_memory_access(void)
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{
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if (IS_ENABLED(CONFIG_XEN_VIRTIO) && xen_domain())
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platform_set(PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS);
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}
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#ifdef CONFIG_XEN_UNPOPULATED_ALLOC
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int xen_alloc_unpopulated_pages(unsigned int nr_pages, struct page **pages);
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void xen_free_unpopulated_pages(unsigned int nr_pages, struct page **pages);
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