f87e4cac4f
This is a fairly straightforward Xen implementation of smp_ops. Xen has its own IPI mechanisms, and has no dependency on any APIC-based IPI. The smp_ops hooks and the flush_tlb_others pv_op allow a Xen guest to avoid all APIC code in arch/i386 (the only apic operation is a single apic_read for the apic version number). One subtle point which needs to be addressed is unpinning pagetables when another cpu may have a lazy tlb reference to the pagetable. Xen will not allow an in-use pagetable to be unpinned, so we must find any other cpus with a reference to the pagetable and get them to shoot down their references. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Cc: Benjamin LaHaise <bcrl@kvack.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Andi Kleen <ak@suse.de>
60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
#ifndef _XEN_MMU_H
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#include <linux/linkage.h>
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#include <asm/page.h>
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/*
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* Page-directory addresses above 4GB do not fit into architectural %cr3.
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* When accessing %cr3, or equivalent field in vcpu_guest_context, guests
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* must use the following accessor macros to pack/unpack valid MFNs.
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*
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* Note that Xen is using the fact that the pagetable base is always
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* page-aligned, and putting the 12 MSB of the address into the 12 LSB
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* of cr3.
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*/
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#define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20))
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#define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20))
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void set_pte_mfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
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void xen_set_pte(pte_t *ptep, pte_t pteval);
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void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pteval);
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void xen_set_pmd(pmd_t *pmdp, pmd_t pmdval);
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void xen_activate_mm(struct mm_struct *prev, struct mm_struct *next);
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void xen_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm);
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void xen_exit_mmap(struct mm_struct *mm);
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void xen_pgd_pin(pgd_t *pgd);
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//void xen_pgd_unpin(pgd_t *pgd);
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#ifdef CONFIG_X86_PAE
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unsigned long long xen_pte_val(pte_t);
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unsigned long long xen_pmd_val(pmd_t);
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unsigned long long xen_pgd_val(pgd_t);
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pte_t xen_make_pte(unsigned long long);
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pmd_t xen_make_pmd(unsigned long long);
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pgd_t xen_make_pgd(unsigned long long);
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void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pteval);
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void xen_set_pte_atomic(pte_t *ptep, pte_t pte);
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void xen_set_pud(pud_t *ptr, pud_t val);
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void xen_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
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void xen_pmd_clear(pmd_t *pmdp);
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#else
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unsigned long xen_pte_val(pte_t);
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unsigned long xen_pmd_val(pmd_t);
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unsigned long xen_pgd_val(pgd_t);
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pte_t xen_make_pte(unsigned long);
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pmd_t xen_make_pmd(unsigned long);
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pgd_t xen_make_pgd(unsigned long);
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#endif
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#endif /* _XEN_MMU_H */
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