forked from Minki/linux
251e90e7e3
Commitfa1f57421e("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:fa1f57421e("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>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _XEN_XEN_H
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#define _XEN_XEN_H
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enum xen_domain_type {
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XEN_NATIVE, /* running on bare hardware */
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XEN_PV_DOMAIN, /* running in a PV domain */
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XEN_HVM_DOMAIN, /* running in a Xen hvm domain */
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};
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#ifdef CONFIG_XEN
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extern enum xen_domain_type xen_domain_type;
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#else
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#define xen_domain_type XEN_NATIVE
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#endif
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#ifdef CONFIG_XEN_PVH
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extern bool xen_pvh;
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#else
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#define xen_pvh 0
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#endif
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#define xen_domain() (xen_domain_type != XEN_NATIVE)
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#define xen_pv_domain() (xen_domain_type == XEN_PV_DOMAIN)
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#define xen_hvm_domain() (xen_domain_type == XEN_HVM_DOMAIN)
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#define xen_pvh_domain() (xen_pvh)
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#include <linux/types.h>
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extern uint32_t xen_start_flags;
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#include <xen/interface/hvm/start_info.h>
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extern struct hvm_start_info pvh_start_info;
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#ifdef CONFIG_XEN_DOM0
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#include <xen/interface/xen.h>
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#include <asm/xen/hypervisor.h>
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#define xen_initial_domain() (xen_domain() && \
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(xen_start_flags & SIF_INITDOMAIN))
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#else /* !CONFIG_XEN_DOM0 */
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#define xen_initial_domain() (0)
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#endif /* CONFIG_XEN_DOM0 */
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struct bio_vec;
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struct page;
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bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
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const struct page *page);
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#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_XEN_BALLOON)
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extern u64 xen_saved_max_mem_size;
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#endif
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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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#include <linux/ioport.h>
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int arch_xen_unpopulated_init(struct resource **res);
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#else
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#include <xen/balloon.h>
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static inline int xen_alloc_unpopulated_pages(unsigned int nr_pages,
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struct page **pages)
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{
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return xen_alloc_ballooned_pages(nr_pages, pages);
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}
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static inline void xen_free_unpopulated_pages(unsigned int nr_pages,
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struct page **pages)
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{
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xen_free_ballooned_pages(nr_pages, pages);
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}
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#endif
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#endif /* _XEN_XEN_H */
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