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3ad0876554
My recent Xen patch series introduces a new HYPERVISOR_memory_op to
support direct priv-mapping of certain guest resources (such as ioreq
pages, used by emulators) by a tools domain, rather than having to access
such resources via the guest P2M.
This patch adds the necessary infrastructure to the privcmd driver and
Xen MMU code to support direct resource mapping.
NOTE: The adjustment in the MMU code is partially cosmetic. Xen will now
allow a PV tools domain to map guest pages either by GFN or MFN, thus
the term 'mfn' has been swapped for 'pfn' in the lower layers of the
remap code.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
220 lines
6.7 KiB
C
220 lines
6.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef INCLUDE_XEN_OPS_H
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#define INCLUDE_XEN_OPS_H
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#include <linux/percpu.h>
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#include <linux/notifier.h>
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#include <linux/efi.h>
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#include <asm/xen/interface.h>
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#include <xen/interface/vcpu.h>
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DECLARE_PER_CPU(struct vcpu_info *, xen_vcpu);
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DECLARE_PER_CPU(uint32_t, xen_vcpu_id);
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static inline uint32_t xen_vcpu_nr(int cpu)
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{
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return per_cpu(xen_vcpu_id, cpu);
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}
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#define XEN_VCPU_ID_INVALID U32_MAX
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void xen_arch_pre_suspend(void);
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void xen_arch_post_suspend(int suspend_cancelled);
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void xen_timer_resume(void);
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void xen_arch_resume(void);
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void xen_arch_suspend(void);
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void xen_reboot(int reason);
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void xen_resume_notifier_register(struct notifier_block *nb);
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void xen_resume_notifier_unregister(struct notifier_block *nb);
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bool xen_vcpu_stolen(int vcpu);
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void xen_setup_runstate_info(int cpu);
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void xen_time_setup_guest(void);
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void xen_manage_runstate_time(int action);
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void xen_get_runstate_snapshot(struct vcpu_runstate_info *res);
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u64 xen_steal_clock(int cpu);
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int xen_setup_shutdown_event(void);
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extern unsigned long *xen_contiguous_bitmap;
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#ifdef CONFIG_XEN_PV
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int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
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unsigned int address_bits,
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dma_addr_t *dma_handle);
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void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order);
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#else
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static inline int xen_create_contiguous_region(phys_addr_t pstart,
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unsigned int order,
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unsigned int address_bits,
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dma_addr_t *dma_handle)
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{
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return 0;
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}
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static inline void xen_destroy_contiguous_region(phys_addr_t pstart,
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unsigned int order) { }
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#endif
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struct vm_area_struct;
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/*
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* xen_remap_domain_gfn_array() - map an array of foreign frames by gfn
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* @vma: VMA to map the pages into
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* @addr: Address at which to map the pages
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* @gfn: Array of GFNs to map
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* @nr: Number entries in the GFN array
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* @err_ptr: Returns per-GFN error status.
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* @prot: page protection mask
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* @domid: Domain owning the pages
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* @pages: Array of pages if this domain has an auto-translated physmap
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*
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* @gfn and @err_ptr may point to the same buffer, the GFNs will be
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* overwritten by the error codes after they are mapped.
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*
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* Returns the number of successfully mapped frames, or a -ve error
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* code.
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*/
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int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
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unsigned long addr,
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xen_pfn_t *gfn, int nr,
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int *err_ptr, pgprot_t prot,
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unsigned domid,
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struct page **pages);
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/*
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* xen_remap_domain_mfn_array() - map an array of foreign frames by mfn
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* @vma: VMA to map the pages into
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* @addr: Address at which to map the pages
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* @mfn: Array of MFNs to map
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* @nr: Number entries in the MFN array
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* @err_ptr: Returns per-MFN error status.
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* @prot: page protection mask
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* @domid: Domain owning the pages
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* @pages: Array of pages if this domain has an auto-translated physmap
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*
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* @mfn and @err_ptr may point to the same buffer, the MFNs will be
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* overwritten by the error codes after they are mapped.
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*
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* Returns the number of successfully mapped frames, or a -ve error
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* code.
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*/
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int xen_remap_domain_mfn_array(struct vm_area_struct *vma,
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unsigned long addr, xen_pfn_t *mfn, int nr,
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int *err_ptr, pgprot_t prot,
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unsigned int domid, struct page **pages);
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/* xen_remap_domain_gfn_range() - map a range of foreign frames
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* @vma: VMA to map the pages into
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* @addr: Address at which to map the pages
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* @gfn: First GFN to map.
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* @nr: Number frames to map
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* @prot: page protection mask
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* @domid: Domain owning the pages
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* @pages: Array of pages if this domain has an auto-translated physmap
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*
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* Returns the number of successfully mapped frames, or a -ve error
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* code.
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*/
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int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
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unsigned long addr,
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xen_pfn_t gfn, int nr,
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pgprot_t prot, unsigned domid,
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struct page **pages);
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int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
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int numpgs, struct page **pages);
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#ifdef CONFIG_XEN_AUTO_XLATE
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int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
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unsigned long addr,
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xen_pfn_t *gfn, int nr,
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int *err_ptr, pgprot_t prot,
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unsigned domid,
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struct page **pages);
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int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
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int nr, struct page **pages);
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#else
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/*
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* These two functions are called from arch/x86/xen/mmu.c and so stubs
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* are needed for a configuration not specifying CONFIG_XEN_AUTO_XLATE.
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*/
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static inline int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
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unsigned long addr,
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xen_pfn_t *gfn, int nr,
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int *err_ptr, pgprot_t prot,
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unsigned int domid,
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struct page **pages)
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{
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return -EOPNOTSUPP;
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}
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static inline int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
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int nr, struct page **pages)
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{
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return -EOPNOTSUPP;
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}
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#endif
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int xen_xlate_map_ballooned_pages(xen_pfn_t **pfns, void **vaddr,
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unsigned long nr_grant_frames);
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bool xen_running_on_version_or_later(unsigned int major, unsigned int minor);
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efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc);
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efi_status_t xen_efi_set_time(efi_time_t *tm);
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efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending,
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efi_time_t *tm);
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efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm);
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efi_status_t xen_efi_get_variable(efi_char16_t *name, efi_guid_t *vendor,
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u32 *attr, unsigned long *data_size,
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void *data);
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efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
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efi_char16_t *name, efi_guid_t *vendor);
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efi_status_t xen_efi_set_variable(efi_char16_t *name, efi_guid_t *vendor,
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u32 attr, unsigned long data_size,
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void *data);
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efi_status_t xen_efi_query_variable_info(u32 attr, u64 *storage_space,
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u64 *remaining_space,
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u64 *max_variable_size);
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efi_status_t xen_efi_get_next_high_mono_count(u32 *count);
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efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
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unsigned long count, unsigned long sg_list);
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efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
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unsigned long count, u64 *max_size,
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int *reset_type);
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void xen_efi_reset_system(int reset_type, efi_status_t status,
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unsigned long data_size, efi_char16_t *data);
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#ifdef CONFIG_PREEMPT
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static inline void xen_preemptible_hcall_begin(void)
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{
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}
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static inline void xen_preemptible_hcall_end(void)
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{
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}
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#else
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DECLARE_PER_CPU(bool, xen_in_preemptible_hcall);
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static inline void xen_preemptible_hcall_begin(void)
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{
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__this_cpu_write(xen_in_preemptible_hcall, true);
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}
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static inline void xen_preemptible_hcall_end(void)
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{
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__this_cpu_write(xen_in_preemptible_hcall, false);
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}
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#endif /* CONFIG_PREEMPT */
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#endif /* INCLUDE_XEN_OPS_H */
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