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2f6474e463
Convert the XEN/PV hypercall to IDTENTRY: - Emit the ASM stub with DECLARE_IDTENTRY - Remove the ASM idtentry in 64-bit - Remove the open coded ASM entry code in 32-bit - Remove the old prototypes The handler stubs need to stay in ASM code as they need corner case handling and adjustment of the stack pointer. Provide a new C function which invokes the entry/exit handling and calls into the XEN handler on the interrupt stack if required. The exit code is slightly different from the regular idtentry_exit() on non-preemptible kernels. If the hypercall is preemptible and need_resched() is set then XEN provides a preempt hypercall scheduling function. Move this functionality into the entry code so it can use the existing idtentry functionality. [ mingo: Build fixes. ] Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Andy Lutomirski <luto@kernel.org> Acked-by: Juergen Gross <jgross@suse.com> Tested-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20200521202118.055270078@linutronix.de
240 lines
7.1 KiB
C
240 lines
7.1 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 <xen/features.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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#if defined(CONFIG_XEN_PV) || defined(CONFIG_ARM) || defined(CONFIG_ARM64)
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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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#if defined(CONFIG_XEN_PV)
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int xen_remap_pfn(struct vm_area_struct *vma, unsigned long addr,
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xen_pfn_t *pfn, int nr, int *err_ptr, pgprot_t prot,
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unsigned int domid, bool no_translate, struct page **pages);
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#else
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static inline int xen_remap_pfn(struct vm_area_struct *vma, unsigned long addr,
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xen_pfn_t *pfn, int nr, int *err_ptr,
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pgprot_t prot, unsigned int domid,
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bool no_translate, struct page **pages)
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{
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BUG();
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return 0;
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}
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#endif
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struct vm_area_struct;
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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 int 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_remap_vma_range(struct vm_area_struct *vma, unsigned long addr,
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unsigned long len);
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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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static inline 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 int domid,
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struct page **pages)
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{
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if (xen_feature(XENFEAT_auto_translated_physmap))
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return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
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prot, domid, pages);
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/* We BUG_ON because it's a programmer error to pass a NULL err_ptr,
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* and the consequences later is quite hard to detect what the actual
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* cause of "wrong memory was mapped in".
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*/
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BUG_ON(err_ptr == NULL);
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return xen_remap_pfn(vma, addr, gfn, nr, err_ptr, prot, domid,
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false, pages);
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}
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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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static inline int xen_remap_domain_mfn_array(struct vm_area_struct *vma,
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unsigned long addr, xen_pfn_t *mfn,
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int nr, int *err_ptr,
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pgprot_t prot, unsigned int domid,
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struct page **pages)
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{
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if (xen_feature(XENFEAT_auto_translated_physmap))
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return -EOPNOTSUPP;
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return xen_remap_pfn(vma, addr, mfn, nr, err_ptr, prot, domid,
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true, pages);
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}
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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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static inline 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 int domid,
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struct page **pages)
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{
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if (xen_feature(XENFEAT_auto_translated_physmap))
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return -EOPNOTSUPP;
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return xen_remap_pfn(vma, addr, &gfn, nr, NULL, prot, domid, false,
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pages);
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}
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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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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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void xen_efi_runtime_setup(void);
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#if defined(CONFIG_XEN_PV) && !defined(CONFIG_PREEMPTION)
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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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#else
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static inline void xen_preemptible_hcall_begin(void) { }
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static inline void xen_preemptible_hcall_end(void) { }
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#endif /* CONFIG_XEN_PV && !CONFIG_PREEMPTION */
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#endif /* INCLUDE_XEN_OPS_H */
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