forked from luck/tmp_suning_uos_patched
xen: move remaining mmu-related stuff into mmu.c
Impact: Cleanup Move remaining mmu-related stuff into mmu.c. A general cleanup, and lay the groundwork for later patches. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
parent
9b7ed8faa0
commit
319f3ba52c
arch/x86/xen
@ -61,35 +61,6 @@ DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info);
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enum xen_domain_type xen_domain_type = XEN_NATIVE;
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EXPORT_SYMBOL_GPL(xen_domain_type);
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/*
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* Identity map, in addition to plain kernel map. This needs to be
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* large enough to allocate page table pages to allocate the rest.
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* Each page can map 2MB.
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*/
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static pte_t level1_ident_pgt[PTRS_PER_PTE * 4] __page_aligned_bss;
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#ifdef CONFIG_X86_64
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/* l3 pud for userspace vsyscall mapping */
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static pud_t level3_user_vsyscall[PTRS_PER_PUD] __page_aligned_bss;
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#endif /* CONFIG_X86_64 */
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/*
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* Note about cr3 (pagetable base) values:
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*
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* xen_cr3 contains the current logical cr3 value; it contains the
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* last set cr3. This may not be the current effective cr3, because
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* its update may be being lazily deferred. However, a vcpu looking
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* at its own cr3 can use this value knowing that it everything will
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* be self-consistent.
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*
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* xen_current_cr3 contains the actual vcpu cr3; it is set once the
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* hypercall to set the vcpu cr3 is complete (so it may be a little
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* out of date, but it will never be set early). If one vcpu is
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* looking at another vcpu's cr3 value, it should use this variable.
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*/
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DEFINE_PER_CPU(unsigned long, xen_cr3); /* cr3 stored as physaddr */
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DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */
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struct start_info *xen_start_info;
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EXPORT_SYMBOL_GPL(xen_start_info);
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@ -237,7 +208,7 @@ static unsigned long xen_get_debugreg(int reg)
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return HYPERVISOR_get_debugreg(reg);
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}
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static void xen_leave_lazy(void)
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void xen_leave_lazy(void)
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{
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paravirt_leave_lazy(paravirt_get_lazy_mode());
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xen_mc_flush();
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@ -598,76 +569,6 @@ static struct apic_ops xen_basic_apic_ops = {
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#endif
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static void xen_flush_tlb(void)
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{
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struct mmuext_op *op;
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struct multicall_space mcs;
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preempt_disable();
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mcs = xen_mc_entry(sizeof(*op));
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op = mcs.args;
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op->cmd = MMUEXT_TLB_FLUSH_LOCAL;
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MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
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xen_mc_issue(PARAVIRT_LAZY_MMU);
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preempt_enable();
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}
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static void xen_flush_tlb_single(unsigned long addr)
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{
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struct mmuext_op *op;
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struct multicall_space mcs;
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preempt_disable();
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mcs = xen_mc_entry(sizeof(*op));
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op = mcs.args;
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op->cmd = MMUEXT_INVLPG_LOCAL;
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op->arg1.linear_addr = addr & PAGE_MASK;
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MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
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xen_mc_issue(PARAVIRT_LAZY_MMU);
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preempt_enable();
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}
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static void xen_flush_tlb_others(const struct cpumask *cpus,
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struct mm_struct *mm, unsigned long va)
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{
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struct {
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struct mmuext_op op;
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DECLARE_BITMAP(mask, NR_CPUS);
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} *args;
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struct multicall_space mcs;
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BUG_ON(cpumask_empty(cpus));
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BUG_ON(!mm);
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mcs = xen_mc_entry(sizeof(*args));
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args = mcs.args;
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args->op.arg2.vcpumask = to_cpumask(args->mask);
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/* Remove us, and any offline CPUS. */
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cpumask_and(to_cpumask(args->mask), cpus, cpu_online_mask);
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cpumask_clear_cpu(smp_processor_id(), to_cpumask(args->mask));
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if (unlikely(cpumask_empty(to_cpumask(args->mask))))
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goto issue;
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if (va == TLB_FLUSH_ALL) {
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args->op.cmd = MMUEXT_TLB_FLUSH_MULTI;
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} else {
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args->op.cmd = MMUEXT_INVLPG_MULTI;
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args->op.arg1.linear_addr = va;
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}
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MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF);
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issue:
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xen_mc_issue(PARAVIRT_LAZY_MMU);
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}
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static void xen_clts(void)
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{
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@ -693,21 +594,6 @@ static void xen_write_cr0(unsigned long cr0)
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xen_mc_issue(PARAVIRT_LAZY_CPU);
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}
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static void xen_write_cr2(unsigned long cr2)
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{
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percpu_read(xen_vcpu)->arch.cr2 = cr2;
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}
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static unsigned long xen_read_cr2(void)
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{
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return percpu_read(xen_vcpu)->arch.cr2;
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}
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static unsigned long xen_read_cr2_direct(void)
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{
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return percpu_read(xen_vcpu_info.arch.cr2);
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}
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static void xen_write_cr4(unsigned long cr4)
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{
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cr4 &= ~X86_CR4_PGE;
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@ -716,71 +602,6 @@ static void xen_write_cr4(unsigned long cr4)
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native_write_cr4(cr4);
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}
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static unsigned long xen_read_cr3(void)
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{
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return percpu_read(xen_cr3);
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}
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static void set_current_cr3(void *v)
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{
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percpu_write(xen_current_cr3, (unsigned long)v);
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}
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static void __xen_write_cr3(bool kernel, unsigned long cr3)
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{
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struct mmuext_op *op;
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struct multicall_space mcs;
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unsigned long mfn;
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if (cr3)
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mfn = pfn_to_mfn(PFN_DOWN(cr3));
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else
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mfn = 0;
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WARN_ON(mfn == 0 && kernel);
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mcs = __xen_mc_entry(sizeof(*op));
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op = mcs.args;
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op->cmd = kernel ? MMUEXT_NEW_BASEPTR : MMUEXT_NEW_USER_BASEPTR;
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op->arg1.mfn = mfn;
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MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
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if (kernel) {
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percpu_write(xen_cr3, cr3);
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/* Update xen_current_cr3 once the batch has actually
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been submitted. */
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xen_mc_callback(set_current_cr3, (void *)cr3);
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}
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}
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static void xen_write_cr3(unsigned long cr3)
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{
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BUG_ON(preemptible());
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xen_mc_batch(); /* disables interrupts */
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/* Update while interrupts are disabled, so its atomic with
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respect to ipis */
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percpu_write(xen_cr3, cr3);
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__xen_write_cr3(true, cr3);
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#ifdef CONFIG_X86_64
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{
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pgd_t *user_pgd = xen_get_user_pgd(__va(cr3));
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if (user_pgd)
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__xen_write_cr3(false, __pa(user_pgd));
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else
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__xen_write_cr3(false, 0);
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}
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#endif
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xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */
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}
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static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
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{
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int ret;
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@ -822,185 +643,6 @@ static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
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return ret;
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}
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/* Early in boot, while setting up the initial pagetable, assume
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everything is pinned. */
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static __init void xen_alloc_pte_init(struct mm_struct *mm, unsigned long pfn)
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{
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#ifdef CONFIG_FLATMEM
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BUG_ON(mem_map); /* should only be used early */
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#endif
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make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
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}
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/* Early release_pte assumes that all pts are pinned, since there's
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only init_mm and anything attached to that is pinned. */
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static void xen_release_pte_init(unsigned long pfn)
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{
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make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
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}
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static void pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
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{
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struct mmuext_op op;
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op.cmd = cmd;
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op.arg1.mfn = pfn_to_mfn(pfn);
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if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
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BUG();
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}
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/* This needs to make sure the new pte page is pinned iff its being
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attached to a pinned pagetable. */
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static void xen_alloc_ptpage(struct mm_struct *mm, unsigned long pfn, unsigned level)
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{
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struct page *page = pfn_to_page(pfn);
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if (PagePinned(virt_to_page(mm->pgd))) {
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SetPagePinned(page);
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vm_unmap_aliases();
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if (!PageHighMem(page)) {
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make_lowmem_page_readonly(__va(PFN_PHYS((unsigned long)pfn)));
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if (level == PT_PTE && USE_SPLIT_PTLOCKS)
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pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
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} else {
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/* make sure there are no stray mappings of
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this page */
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kmap_flush_unused();
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}
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}
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}
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static void xen_alloc_pte(struct mm_struct *mm, unsigned long pfn)
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{
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xen_alloc_ptpage(mm, pfn, PT_PTE);
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}
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static void xen_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
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{
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xen_alloc_ptpage(mm, pfn, PT_PMD);
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}
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static int xen_pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *pgd = mm->pgd;
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int ret = 0;
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BUG_ON(PagePinned(virt_to_page(pgd)));
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#ifdef CONFIG_X86_64
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{
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struct page *page = virt_to_page(pgd);
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pgd_t *user_pgd;
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BUG_ON(page->private != 0);
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ret = -ENOMEM;
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user_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
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page->private = (unsigned long)user_pgd;
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if (user_pgd != NULL) {
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user_pgd[pgd_index(VSYSCALL_START)] =
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__pgd(__pa(level3_user_vsyscall) | _PAGE_TABLE);
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ret = 0;
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}
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BUG_ON(PagePinned(virt_to_page(xen_get_user_pgd(pgd))));
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}
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#endif
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return ret;
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}
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static void xen_pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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#ifdef CONFIG_X86_64
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pgd_t *user_pgd = xen_get_user_pgd(pgd);
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if (user_pgd)
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free_page((unsigned long)user_pgd);
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#endif
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}
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/* This should never happen until we're OK to use struct page */
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static void xen_release_ptpage(unsigned long pfn, unsigned level)
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{
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struct page *page = pfn_to_page(pfn);
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if (PagePinned(page)) {
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if (!PageHighMem(page)) {
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if (level == PT_PTE && USE_SPLIT_PTLOCKS)
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pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
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make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
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}
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ClearPagePinned(page);
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}
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}
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static void xen_release_pte(unsigned long pfn)
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{
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xen_release_ptpage(pfn, PT_PTE);
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}
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static void xen_release_pmd(unsigned long pfn)
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{
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xen_release_ptpage(pfn, PT_PMD);
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}
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#if PAGETABLE_LEVELS == 4
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static void xen_alloc_pud(struct mm_struct *mm, unsigned long pfn)
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{
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xen_alloc_ptpage(mm, pfn, PT_PUD);
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}
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static void xen_release_pud(unsigned long pfn)
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{
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xen_release_ptpage(pfn, PT_PUD);
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}
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#endif
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#ifdef CONFIG_HIGHPTE
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static void *xen_kmap_atomic_pte(struct page *page, enum km_type type)
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{
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pgprot_t prot = PAGE_KERNEL;
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if (PagePinned(page))
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prot = PAGE_KERNEL_RO;
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if (0 && PageHighMem(page))
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printk("mapping highpte %lx type %d prot %s\n",
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page_to_pfn(page), type,
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(unsigned long)pgprot_val(prot) & _PAGE_RW ? "WRITE" : "READ");
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return kmap_atomic_prot(page, type, prot);
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}
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#endif
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#ifdef CONFIG_X86_32
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static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte)
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{
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/* If there's an existing pte, then don't allow _PAGE_RW to be set */
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if (pte_val_ma(*ptep) & _PAGE_PRESENT)
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pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) &
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pte_val_ma(pte));
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return pte;
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}
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/* Init-time set_pte while constructing initial pagetables, which
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doesn't allow RO pagetable pages to be remapped RW */
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static __init void xen_set_pte_init(pte_t *ptep, pte_t pte)
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{
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pte = mask_rw_pte(ptep, pte);
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xen_set_pte(ptep, pte);
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}
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#endif
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static __init void xen_pagetable_setup_start(pgd_t *base)
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{
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}
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void xen_setup_shared_info(void)
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{
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if (!xen_feature(XENFEAT_auto_translated_physmap)) {
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@ -1021,37 +663,6 @@ void xen_setup_shared_info(void)
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xen_setup_mfn_list_list();
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}
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static __init void xen_pagetable_setup_done(pgd_t *base)
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{
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xen_setup_shared_info();
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}
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static __init void xen_post_allocator_init(void)
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{
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pv_mmu_ops.set_pte = xen_set_pte;
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pv_mmu_ops.set_pmd = xen_set_pmd;
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pv_mmu_ops.set_pud = xen_set_pud;
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#if PAGETABLE_LEVELS == 4
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pv_mmu_ops.set_pgd = xen_set_pgd;
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#endif
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/* This will work as long as patching hasn't happened yet
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(which it hasn't) */
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pv_mmu_ops.alloc_pte = xen_alloc_pte;
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pv_mmu_ops.alloc_pmd = xen_alloc_pmd;
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pv_mmu_ops.release_pte = xen_release_pte;
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pv_mmu_ops.release_pmd = xen_release_pmd;
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#if PAGETABLE_LEVELS == 4
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pv_mmu_ops.alloc_pud = xen_alloc_pud;
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pv_mmu_ops.release_pud = xen_release_pud;
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#endif
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#ifdef CONFIG_X86_64
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SetPagePinned(virt_to_page(level3_user_vsyscall));
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#endif
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xen_mark_init_mm_pinned();
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}
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/* This is called once we have the cpu_possible_map */
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void xen_setup_vcpu_info_placement(void)
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{
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@ -1126,49 +737,6 @@ static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf,
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return ret;
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}
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static void xen_set_fixmap(unsigned idx, unsigned long phys, pgprot_t prot)
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{
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pte_t pte;
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phys >>= PAGE_SHIFT;
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switch (idx) {
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case FIX_BTMAP_END ... FIX_BTMAP_BEGIN:
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#ifdef CONFIG_X86_F00F_BUG
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case FIX_F00F_IDT:
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#endif
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#ifdef CONFIG_X86_32
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case FIX_WP_TEST:
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case FIX_VDSO:
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# ifdef CONFIG_HIGHMEM
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case FIX_KMAP_BEGIN ... FIX_KMAP_END:
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# endif
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#else
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case VSYSCALL_LAST_PAGE ... VSYSCALL_FIRST_PAGE:
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#endif
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#ifdef CONFIG_X86_LOCAL_APIC
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case FIX_APIC_BASE: /* maps dummy local APIC */
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#endif
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pte = pfn_pte(phys, prot);
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break;
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default:
|
||||
pte = mfn_pte(phys, prot);
|
||||
break;
|
||||
}
|
||||
|
||||
__native_set_fixmap(idx, pte);
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
/* Replicate changes to map the vsyscall page into the user
|
||||
pagetable vsyscall mapping. */
|
||||
if (idx >= VSYSCALL_LAST_PAGE && idx <= VSYSCALL_FIRST_PAGE) {
|
||||
unsigned long vaddr = __fix_to_virt(idx);
|
||||
set_pte_vaddr_pud(level3_user_vsyscall, vaddr, pte);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
static const struct pv_info xen_info __initdata = {
|
||||
.paravirt_enabled = 1,
|
||||
.shared_kernel_pmd = 0,
|
||||
@ -1264,86 +832,6 @@ static const struct pv_apic_ops xen_apic_ops __initdata = {
|
||||
#endif
|
||||
};
|
||||
|
||||
static const struct pv_mmu_ops xen_mmu_ops __initdata = {
|
||||
.pagetable_setup_start = xen_pagetable_setup_start,
|
||||
.pagetable_setup_done = xen_pagetable_setup_done,
|
||||
|
||||
.read_cr2 = xen_read_cr2,
|
||||
.write_cr2 = xen_write_cr2,
|
||||
|
||||
.read_cr3 = xen_read_cr3,
|
||||
.write_cr3 = xen_write_cr3,
|
||||
|
||||
.flush_tlb_user = xen_flush_tlb,
|
||||
.flush_tlb_kernel = xen_flush_tlb,
|
||||
.flush_tlb_single = xen_flush_tlb_single,
|
||||
.flush_tlb_others = xen_flush_tlb_others,
|
||||
|
||||
.pte_update = paravirt_nop,
|
||||
.pte_update_defer = paravirt_nop,
|
||||
|
||||
.pgd_alloc = xen_pgd_alloc,
|
||||
.pgd_free = xen_pgd_free,
|
||||
|
||||
.alloc_pte = xen_alloc_pte_init,
|
||||
.release_pte = xen_release_pte_init,
|
||||
.alloc_pmd = xen_alloc_pte_init,
|
||||
.alloc_pmd_clone = paravirt_nop,
|
||||
.release_pmd = xen_release_pte_init,
|
||||
|
||||
#ifdef CONFIG_HIGHPTE
|
||||
.kmap_atomic_pte = xen_kmap_atomic_pte,
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
.set_pte = xen_set_pte,
|
||||
#else
|
||||
.set_pte = xen_set_pte_init,
|
||||
#endif
|
||||
.set_pte_at = xen_set_pte_at,
|
||||
.set_pmd = xen_set_pmd_hyper,
|
||||
|
||||
.ptep_modify_prot_start = __ptep_modify_prot_start,
|
||||
.ptep_modify_prot_commit = __ptep_modify_prot_commit,
|
||||
|
||||
.pte_val = xen_pte_val,
|
||||
.pgd_val = xen_pgd_val,
|
||||
|
||||
.make_pte = xen_make_pte,
|
||||
.make_pgd = xen_make_pgd,
|
||||
|
||||
#ifdef CONFIG_X86_PAE
|
||||
.set_pte_atomic = xen_set_pte_atomic,
|
||||
.set_pte_present = xen_set_pte_at,
|
||||
.pte_clear = xen_pte_clear,
|
||||
.pmd_clear = xen_pmd_clear,
|
||||
#endif /* CONFIG_X86_PAE */
|
||||
.set_pud = xen_set_pud_hyper,
|
||||
|
||||
.make_pmd = xen_make_pmd,
|
||||
.pmd_val = xen_pmd_val,
|
||||
|
||||
#if PAGETABLE_LEVELS == 4
|
||||
.pud_val = xen_pud_val,
|
||||
.make_pud = xen_make_pud,
|
||||
.set_pgd = xen_set_pgd_hyper,
|
||||
|
||||
.alloc_pud = xen_alloc_pte_init,
|
||||
.release_pud = xen_release_pte_init,
|
||||
#endif /* PAGETABLE_LEVELS == 4 */
|
||||
|
||||
.activate_mm = xen_activate_mm,
|
||||
.dup_mmap = xen_dup_mmap,
|
||||
.exit_mmap = xen_exit_mmap,
|
||||
|
||||
.lazy_mode = {
|
||||
.enter = paravirt_enter_lazy_mmu,
|
||||
.leave = xen_leave_lazy,
|
||||
},
|
||||
|
||||
.set_fixmap = xen_set_fixmap,
|
||||
};
|
||||
|
||||
static void xen_reboot(int reason)
|
||||
{
|
||||
struct sched_shutdown r = { .reason = reason };
|
||||
@ -1386,223 +874,6 @@ static const struct machine_ops __initdata xen_machine_ops = {
|
||||
};
|
||||
|
||||
|
||||
static void __init xen_reserve_top(void)
|
||||
{
|
||||
#ifdef CONFIG_X86_32
|
||||
unsigned long top = HYPERVISOR_VIRT_START;
|
||||
struct xen_platform_parameters pp;
|
||||
|
||||
if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0)
|
||||
top = pp.virt_start;
|
||||
|
||||
reserve_top_address(-top);
|
||||
#endif /* CONFIG_X86_32 */
|
||||
}
|
||||
|
||||
/*
|
||||
* Like __va(), but returns address in the kernel mapping (which is
|
||||
* all we have until the physical memory mapping has been set up.
|
||||
*/
|
||||
static void *__ka(phys_addr_t paddr)
|
||||
{
|
||||
#ifdef CONFIG_X86_64
|
||||
return (void *)(paddr + __START_KERNEL_map);
|
||||
#else
|
||||
return __va(paddr);
|
||||
#endif
|
||||
}
|
||||
|
||||
/* Convert a machine address to physical address */
|
||||
static unsigned long m2p(phys_addr_t maddr)
|
||||
{
|
||||
phys_addr_t paddr;
|
||||
|
||||
maddr &= PTE_PFN_MASK;
|
||||
paddr = mfn_to_pfn(maddr >> PAGE_SHIFT) << PAGE_SHIFT;
|
||||
|
||||
return paddr;
|
||||
}
|
||||
|
||||
/* Convert a machine address to kernel virtual */
|
||||
static void *m2v(phys_addr_t maddr)
|
||||
{
|
||||
return __ka(m2p(maddr));
|
||||
}
|
||||
|
||||
static void set_page_prot(void *addr, pgprot_t prot)
|
||||
{
|
||||
unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
|
||||
pte_t pte = pfn_pte(pfn, prot);
|
||||
|
||||
if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, 0))
|
||||
BUG();
|
||||
}
|
||||
|
||||
static __init void xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
|
||||
{
|
||||
unsigned pmdidx, pteidx;
|
||||
unsigned ident_pte;
|
||||
unsigned long pfn;
|
||||
|
||||
ident_pte = 0;
|
||||
pfn = 0;
|
||||
for (pmdidx = 0; pmdidx < PTRS_PER_PMD && pfn < max_pfn; pmdidx++) {
|
||||
pte_t *pte_page;
|
||||
|
||||
/* Reuse or allocate a page of ptes */
|
||||
if (pmd_present(pmd[pmdidx]))
|
||||
pte_page = m2v(pmd[pmdidx].pmd);
|
||||
else {
|
||||
/* Check for free pte pages */
|
||||
if (ident_pte == ARRAY_SIZE(level1_ident_pgt))
|
||||
break;
|
||||
|
||||
pte_page = &level1_ident_pgt[ident_pte];
|
||||
ident_pte += PTRS_PER_PTE;
|
||||
|
||||
pmd[pmdidx] = __pmd(__pa(pte_page) | _PAGE_TABLE);
|
||||
}
|
||||
|
||||
/* Install mappings */
|
||||
for (pteidx = 0; pteidx < PTRS_PER_PTE; pteidx++, pfn++) {
|
||||
pte_t pte;
|
||||
|
||||
if (pfn > max_pfn_mapped)
|
||||
max_pfn_mapped = pfn;
|
||||
|
||||
if (!pte_none(pte_page[pteidx]))
|
||||
continue;
|
||||
|
||||
pte = pfn_pte(pfn, PAGE_KERNEL_EXEC);
|
||||
pte_page[pteidx] = pte;
|
||||
}
|
||||
}
|
||||
|
||||
for (pteidx = 0; pteidx < ident_pte; pteidx += PTRS_PER_PTE)
|
||||
set_page_prot(&level1_ident_pgt[pteidx], PAGE_KERNEL_RO);
|
||||
|
||||
set_page_prot(pmd, PAGE_KERNEL_RO);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
static void convert_pfn_mfn(void *v)
|
||||
{
|
||||
pte_t *pte = v;
|
||||
int i;
|
||||
|
||||
/* All levels are converted the same way, so just treat them
|
||||
as ptes. */
|
||||
for (i = 0; i < PTRS_PER_PTE; i++)
|
||||
pte[i] = xen_make_pte(pte[i].pte);
|
||||
}
|
||||
|
||||
/*
|
||||
* Set up the inital kernel pagetable.
|
||||
*
|
||||
* We can construct this by grafting the Xen provided pagetable into
|
||||
* head_64.S's preconstructed pagetables. We copy the Xen L2's into
|
||||
* level2_ident_pgt, level2_kernel_pgt and level2_fixmap_pgt. This
|
||||
* means that only the kernel has a physical mapping to start with -
|
||||
* but that's enough to get __va working. We need to fill in the rest
|
||||
* of the physical mapping once some sort of allocator has been set
|
||||
* up.
|
||||
*/
|
||||
static __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
|
||||
unsigned long max_pfn)
|
||||
{
|
||||
pud_t *l3;
|
||||
pmd_t *l2;
|
||||
|
||||
/* Zap identity mapping */
|
||||
init_level4_pgt[0] = __pgd(0);
|
||||
|
||||
/* Pre-constructed entries are in pfn, so convert to mfn */
|
||||
convert_pfn_mfn(init_level4_pgt);
|
||||
convert_pfn_mfn(level3_ident_pgt);
|
||||
convert_pfn_mfn(level3_kernel_pgt);
|
||||
|
||||
l3 = m2v(pgd[pgd_index(__START_KERNEL_map)].pgd);
|
||||
l2 = m2v(l3[pud_index(__START_KERNEL_map)].pud);
|
||||
|
||||
memcpy(level2_ident_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
|
||||
memcpy(level2_kernel_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
|
||||
|
||||
l3 = m2v(pgd[pgd_index(__START_KERNEL_map + PMD_SIZE)].pgd);
|
||||
l2 = m2v(l3[pud_index(__START_KERNEL_map + PMD_SIZE)].pud);
|
||||
memcpy(level2_fixmap_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
|
||||
|
||||
/* Set up identity map */
|
||||
xen_map_identity_early(level2_ident_pgt, max_pfn);
|
||||
|
||||
/* Make pagetable pieces RO */
|
||||
set_page_prot(init_level4_pgt, PAGE_KERNEL_RO);
|
||||
set_page_prot(level3_ident_pgt, PAGE_KERNEL_RO);
|
||||
set_page_prot(level3_kernel_pgt, PAGE_KERNEL_RO);
|
||||
set_page_prot(level3_user_vsyscall, PAGE_KERNEL_RO);
|
||||
set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO);
|
||||
set_page_prot(level2_fixmap_pgt, PAGE_KERNEL_RO);
|
||||
|
||||
/* Pin down new L4 */
|
||||
pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE,
|
||||
PFN_DOWN(__pa_symbol(init_level4_pgt)));
|
||||
|
||||
/* Unpin Xen-provided one */
|
||||
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
|
||||
|
||||
/* Switch over */
|
||||
pgd = init_level4_pgt;
|
||||
|
||||
/*
|
||||
* At this stage there can be no user pgd, and no page
|
||||
* structure to attach it to, so make sure we just set kernel
|
||||
* pgd.
|
||||
*/
|
||||
xen_mc_batch();
|
||||
__xen_write_cr3(true, __pa(pgd));
|
||||
xen_mc_issue(PARAVIRT_LAZY_CPU);
|
||||
|
||||
reserve_early(__pa(xen_start_info->pt_base),
|
||||
__pa(xen_start_info->pt_base +
|
||||
xen_start_info->nr_pt_frames * PAGE_SIZE),
|
||||
"XEN PAGETABLES");
|
||||
|
||||
return pgd;
|
||||
}
|
||||
#else /* !CONFIG_X86_64 */
|
||||
static pmd_t level2_kernel_pgt[PTRS_PER_PMD] __page_aligned_bss;
|
||||
|
||||
static __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
|
||||
unsigned long max_pfn)
|
||||
{
|
||||
pmd_t *kernel_pmd;
|
||||
|
||||
init_pg_tables_start = __pa(pgd);
|
||||
init_pg_tables_end = __pa(pgd) + xen_start_info->nr_pt_frames*PAGE_SIZE;
|
||||
max_pfn_mapped = PFN_DOWN(init_pg_tables_end + 512*1024);
|
||||
|
||||
kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
|
||||
memcpy(level2_kernel_pgt, kernel_pmd, sizeof(pmd_t) * PTRS_PER_PMD);
|
||||
|
||||
xen_map_identity_early(level2_kernel_pgt, max_pfn);
|
||||
|
||||
memcpy(swapper_pg_dir, pgd, sizeof(pgd_t) * PTRS_PER_PGD);
|
||||
set_pgd(&swapper_pg_dir[KERNEL_PGD_BOUNDARY],
|
||||
__pgd(__pa(level2_kernel_pgt) | _PAGE_PRESENT));
|
||||
|
||||
set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO);
|
||||
set_page_prot(swapper_pg_dir, PAGE_KERNEL_RO);
|
||||
set_page_prot(empty_zero_page, PAGE_KERNEL_RO);
|
||||
|
||||
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
|
||||
|
||||
xen_write_cr3(__pa(swapper_pg_dir));
|
||||
|
||||
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(swapper_pg_dir)));
|
||||
|
||||
return swapper_pg_dir;
|
||||
}
|
||||
#endif /* CONFIG_X86_64 */
|
||||
|
||||
/* First C function to be called on Xen boot */
|
||||
asmlinkage void __init xen_start_kernel(void)
|
||||
{
|
||||
|
@ -47,6 +47,7 @@
|
||||
#include <asm/tlbflush.h>
|
||||
#include <asm/fixmap.h>
|
||||
#include <asm/mmu_context.h>
|
||||
#include <asm/setup.h>
|
||||
#include <asm/paravirt.h>
|
||||
#include <asm/linkage.h>
|
||||
|
||||
@ -55,6 +56,8 @@
|
||||
|
||||
#include <xen/page.h>
|
||||
#include <xen/interface/xen.h>
|
||||
#include <xen/interface/version.h>
|
||||
#include <xen/hvc-console.h>
|
||||
|
||||
#include "multicalls.h"
|
||||
#include "mmu.h"
|
||||
@ -114,6 +117,37 @@ static inline void check_zero(void)
|
||||
|
||||
#endif /* CONFIG_XEN_DEBUG_FS */
|
||||
|
||||
|
||||
/*
|
||||
* Identity map, in addition to plain kernel map. This needs to be
|
||||
* large enough to allocate page table pages to allocate the rest.
|
||||
* Each page can map 2MB.
|
||||
*/
|
||||
static pte_t level1_ident_pgt[PTRS_PER_PTE * 4] __page_aligned_bss;
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
/* l3 pud for userspace vsyscall mapping */
|
||||
static pud_t level3_user_vsyscall[PTRS_PER_PUD] __page_aligned_bss;
|
||||
#endif /* CONFIG_X86_64 */
|
||||
|
||||
/*
|
||||
* Note about cr3 (pagetable base) values:
|
||||
*
|
||||
* xen_cr3 contains the current logical cr3 value; it contains the
|
||||
* last set cr3. This may not be the current effective cr3, because
|
||||
* its update may be being lazily deferred. However, a vcpu looking
|
||||
* at its own cr3 can use this value knowing that it everything will
|
||||
* be self-consistent.
|
||||
*
|
||||
* xen_current_cr3 contains the actual vcpu cr3; it is set once the
|
||||
* hypercall to set the vcpu cr3 is complete (so it may be a little
|
||||
* out of date, but it will never be set early). If one vcpu is
|
||||
* looking at another vcpu's cr3 value, it should use this variable.
|
||||
*/
|
||||
DEFINE_PER_CPU(unsigned long, xen_cr3); /* cr3 stored as physaddr */
|
||||
DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */
|
||||
|
||||
|
||||
/*
|
||||
* Just beyond the highest usermode address. STACK_TOP_MAX has a
|
||||
* redzone above it, so round it up to a PGD boundary.
|
||||
@ -1152,6 +1186,672 @@ void xen_exit_mmap(struct mm_struct *mm)
|
||||
spin_unlock(&mm->page_table_lock);
|
||||
}
|
||||
|
||||
static __init void xen_pagetable_setup_start(pgd_t *base)
|
||||
{
|
||||
}
|
||||
|
||||
static __init void xen_pagetable_setup_done(pgd_t *base)
|
||||
{
|
||||
xen_setup_shared_info();
|
||||
}
|
||||
|
||||
static void xen_write_cr2(unsigned long cr2)
|
||||
{
|
||||
percpu_read(xen_vcpu)->arch.cr2 = cr2;
|
||||
}
|
||||
|
||||
static unsigned long xen_read_cr2(void)
|
||||
{
|
||||
return percpu_read(xen_vcpu)->arch.cr2;
|
||||
}
|
||||
|
||||
unsigned long xen_read_cr2_direct(void)
|
||||
{
|
||||
return percpu_read(xen_vcpu_info.arch.cr2);
|
||||
}
|
||||
|
||||
static void xen_flush_tlb(void)
|
||||
{
|
||||
struct mmuext_op *op;
|
||||
struct multicall_space mcs;
|
||||
|
||||
preempt_disable();
|
||||
|
||||
mcs = xen_mc_entry(sizeof(*op));
|
||||
|
||||
op = mcs.args;
|
||||
op->cmd = MMUEXT_TLB_FLUSH_LOCAL;
|
||||
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
|
||||
|
||||
xen_mc_issue(PARAVIRT_LAZY_MMU);
|
||||
|
||||
preempt_enable();
|
||||
}
|
||||
|
||||
static void xen_flush_tlb_single(unsigned long addr)
|
||||
{
|
||||
struct mmuext_op *op;
|
||||
struct multicall_space mcs;
|
||||
|
||||
preempt_disable();
|
||||
|
||||
mcs = xen_mc_entry(sizeof(*op));
|
||||
op = mcs.args;
|
||||
op->cmd = MMUEXT_INVLPG_LOCAL;
|
||||
op->arg1.linear_addr = addr & PAGE_MASK;
|
||||
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
|
||||
|
||||
xen_mc_issue(PARAVIRT_LAZY_MMU);
|
||||
|
||||
preempt_enable();
|
||||
}
|
||||
|
||||
static void xen_flush_tlb_others(const struct cpumask *cpus,
|
||||
struct mm_struct *mm, unsigned long va)
|
||||
{
|
||||
struct {
|
||||
struct mmuext_op op;
|
||||
DECLARE_BITMAP(mask, NR_CPUS);
|
||||
} *args;
|
||||
struct multicall_space mcs;
|
||||
|
||||
BUG_ON(cpumask_empty(cpus));
|
||||
BUG_ON(!mm);
|
||||
|
||||
mcs = xen_mc_entry(sizeof(*args));
|
||||
args = mcs.args;
|
||||
args->op.arg2.vcpumask = to_cpumask(args->mask);
|
||||
|
||||
/* Remove us, and any offline CPUS. */
|
||||
cpumask_and(to_cpumask(args->mask), cpus, cpu_online_mask);
|
||||
cpumask_clear_cpu(smp_processor_id(), to_cpumask(args->mask));
|
||||
if (unlikely(cpumask_empty(to_cpumask(args->mask))))
|
||||
goto issue;
|
||||
|
||||
if (va == TLB_FLUSH_ALL) {
|
||||
args->op.cmd = MMUEXT_TLB_FLUSH_MULTI;
|
||||
} else {
|
||||
args->op.cmd = MMUEXT_INVLPG_MULTI;
|
||||
args->op.arg1.linear_addr = va;
|
||||
}
|
||||
|
||||
MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF);
|
||||
|
||||
issue:
|
||||
xen_mc_issue(PARAVIRT_LAZY_MMU);
|
||||
}
|
||||
|
||||
static unsigned long xen_read_cr3(void)
|
||||
{
|
||||
return percpu_read(xen_cr3);
|
||||
}
|
||||
|
||||
static void set_current_cr3(void *v)
|
||||
{
|
||||
percpu_write(xen_current_cr3, (unsigned long)v);
|
||||
}
|
||||
|
||||
static void __xen_write_cr3(bool kernel, unsigned long cr3)
|
||||
{
|
||||
struct mmuext_op *op;
|
||||
struct multicall_space mcs;
|
||||
unsigned long mfn;
|
||||
|
||||
if (cr3)
|
||||
mfn = pfn_to_mfn(PFN_DOWN(cr3));
|
||||
else
|
||||
mfn = 0;
|
||||
|
||||
WARN_ON(mfn == 0 && kernel);
|
||||
|
||||
mcs = __xen_mc_entry(sizeof(*op));
|
||||
|
||||
op = mcs.args;
|
||||
op->cmd = kernel ? MMUEXT_NEW_BASEPTR : MMUEXT_NEW_USER_BASEPTR;
|
||||
op->arg1.mfn = mfn;
|
||||
|
||||
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
|
||||
|
||||
if (kernel) {
|
||||
percpu_write(xen_cr3, cr3);
|
||||
|
||||
/* Update xen_current_cr3 once the batch has actually
|
||||
been submitted. */
|
||||
xen_mc_callback(set_current_cr3, (void *)cr3);
|
||||
}
|
||||
}
|
||||
|
||||
static void xen_write_cr3(unsigned long cr3)
|
||||
{
|
||||
BUG_ON(preemptible());
|
||||
|
||||
xen_mc_batch(); /* disables interrupts */
|
||||
|
||||
/* Update while interrupts are disabled, so its atomic with
|
||||
respect to ipis */
|
||||
percpu_write(xen_cr3, cr3);
|
||||
|
||||
__xen_write_cr3(true, cr3);
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
{
|
||||
pgd_t *user_pgd = xen_get_user_pgd(__va(cr3));
|
||||
if (user_pgd)
|
||||
__xen_write_cr3(false, __pa(user_pgd));
|
||||
else
|
||||
__xen_write_cr3(false, 0);
|
||||
}
|
||||
#endif
|
||||
|
||||
xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */
|
||||
}
|
||||
|
||||
static int xen_pgd_alloc(struct mm_struct *mm)
|
||||
{
|
||||
pgd_t *pgd = mm->pgd;
|
||||
int ret = 0;
|
||||
|
||||
BUG_ON(PagePinned(virt_to_page(pgd)));
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
{
|
||||
struct page *page = virt_to_page(pgd);
|
||||
pgd_t *user_pgd;
|
||||
|
||||
BUG_ON(page->private != 0);
|
||||
|
||||
ret = -ENOMEM;
|
||||
|
||||
user_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
|
||||
page->private = (unsigned long)user_pgd;
|
||||
|
||||
if (user_pgd != NULL) {
|
||||
user_pgd[pgd_index(VSYSCALL_START)] =
|
||||
__pgd(__pa(level3_user_vsyscall) | _PAGE_TABLE);
|
||||
ret = 0;
|
||||
}
|
||||
|
||||
BUG_ON(PagePinned(virt_to_page(xen_get_user_pgd(pgd))));
|
||||
}
|
||||
#endif
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void xen_pgd_free(struct mm_struct *mm, pgd_t *pgd)
|
||||
{
|
||||
#ifdef CONFIG_X86_64
|
||||
pgd_t *user_pgd = xen_get_user_pgd(pgd);
|
||||
|
||||
if (user_pgd)
|
||||
free_page((unsigned long)user_pgd);
|
||||
#endif
|
||||
}
|
||||
|
||||
|
||||
/* Early in boot, while setting up the initial pagetable, assume
|
||||
everything is pinned. */
|
||||
static __init void xen_alloc_pte_init(struct mm_struct *mm, unsigned long pfn)
|
||||
{
|
||||
#ifdef CONFIG_FLATMEM
|
||||
BUG_ON(mem_map); /* should only be used early */
|
||||
#endif
|
||||
make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
|
||||
}
|
||||
|
||||
/* Early release_pte assumes that all pts are pinned, since there's
|
||||
only init_mm and anything attached to that is pinned. */
|
||||
static void xen_release_pte_init(unsigned long pfn)
|
||||
{
|
||||
make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
|
||||
}
|
||||
|
||||
static void pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
|
||||
{
|
||||
struct mmuext_op op;
|
||||
op.cmd = cmd;
|
||||
op.arg1.mfn = pfn_to_mfn(pfn);
|
||||
if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
|
||||
BUG();
|
||||
}
|
||||
|
||||
/* This needs to make sure the new pte page is pinned iff its being
|
||||
attached to a pinned pagetable. */
|
||||
static void xen_alloc_ptpage(struct mm_struct *mm, unsigned long pfn, unsigned level)
|
||||
{
|
||||
struct page *page = pfn_to_page(pfn);
|
||||
|
||||
if (PagePinned(virt_to_page(mm->pgd))) {
|
||||
SetPagePinned(page);
|
||||
|
||||
vm_unmap_aliases();
|
||||
if (!PageHighMem(page)) {
|
||||
make_lowmem_page_readonly(__va(PFN_PHYS((unsigned long)pfn)));
|
||||
if (level == PT_PTE && USE_SPLIT_PTLOCKS)
|
||||
pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
|
||||
} else {
|
||||
/* make sure there are no stray mappings of
|
||||
this page */
|
||||
kmap_flush_unused();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void xen_alloc_pte(struct mm_struct *mm, unsigned long pfn)
|
||||
{
|
||||
xen_alloc_ptpage(mm, pfn, PT_PTE);
|
||||
}
|
||||
|
||||
static void xen_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
|
||||
{
|
||||
xen_alloc_ptpage(mm, pfn, PT_PMD);
|
||||
}
|
||||
|
||||
/* This should never happen until we're OK to use struct page */
|
||||
static void xen_release_ptpage(unsigned long pfn, unsigned level)
|
||||
{
|
||||
struct page *page = pfn_to_page(pfn);
|
||||
|
||||
if (PagePinned(page)) {
|
||||
if (!PageHighMem(page)) {
|
||||
if (level == PT_PTE && USE_SPLIT_PTLOCKS)
|
||||
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
|
||||
make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
|
||||
}
|
||||
ClearPagePinned(page);
|
||||
}
|
||||
}
|
||||
|
||||
static void xen_release_pte(unsigned long pfn)
|
||||
{
|
||||
xen_release_ptpage(pfn, PT_PTE);
|
||||
}
|
||||
|
||||
static void xen_release_pmd(unsigned long pfn)
|
||||
{
|
||||
xen_release_ptpage(pfn, PT_PMD);
|
||||
}
|
||||
|
||||
#if PAGETABLE_LEVELS == 4
|
||||
static void xen_alloc_pud(struct mm_struct *mm, unsigned long pfn)
|
||||
{
|
||||
xen_alloc_ptpage(mm, pfn, PT_PUD);
|
||||
}
|
||||
|
||||
static void xen_release_pud(unsigned long pfn)
|
||||
{
|
||||
xen_release_ptpage(pfn, PT_PUD);
|
||||
}
|
||||
#endif
|
||||
|
||||
void __init xen_reserve_top(void)
|
||||
{
|
||||
#ifdef CONFIG_X86_32
|
||||
unsigned long top = HYPERVISOR_VIRT_START;
|
||||
struct xen_platform_parameters pp;
|
||||
|
||||
if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0)
|
||||
top = pp.virt_start;
|
||||
|
||||
reserve_top_address(-top);
|
||||
#endif /* CONFIG_X86_32 */
|
||||
}
|
||||
|
||||
/*
|
||||
* Like __va(), but returns address in the kernel mapping (which is
|
||||
* all we have until the physical memory mapping has been set up.
|
||||
*/
|
||||
static void *__ka(phys_addr_t paddr)
|
||||
{
|
||||
#ifdef CONFIG_X86_64
|
||||
return (void *)(paddr + __START_KERNEL_map);
|
||||
#else
|
||||
return __va(paddr);
|
||||
#endif
|
||||
}
|
||||
|
||||
/* Convert a machine address to physical address */
|
||||
static unsigned long m2p(phys_addr_t maddr)
|
||||
{
|
||||
phys_addr_t paddr;
|
||||
|
||||
maddr &= PTE_PFN_MASK;
|
||||
paddr = mfn_to_pfn(maddr >> PAGE_SHIFT) << PAGE_SHIFT;
|
||||
|
||||
return paddr;
|
||||
}
|
||||
|
||||
/* Convert a machine address to kernel virtual */
|
||||
static void *m2v(phys_addr_t maddr)
|
||||
{
|
||||
return __ka(m2p(maddr));
|
||||
}
|
||||
|
||||
static void set_page_prot(void *addr, pgprot_t prot)
|
||||
{
|
||||
unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
|
||||
pte_t pte = pfn_pte(pfn, prot);
|
||||
|
||||
if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, 0))
|
||||
BUG();
|
||||
}
|
||||
|
||||
static __init void xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
|
||||
{
|
||||
unsigned pmdidx, pteidx;
|
||||
unsigned ident_pte;
|
||||
unsigned long pfn;
|
||||
|
||||
ident_pte = 0;
|
||||
pfn = 0;
|
||||
for (pmdidx = 0; pmdidx < PTRS_PER_PMD && pfn < max_pfn; pmdidx++) {
|
||||
pte_t *pte_page;
|
||||
|
||||
/* Reuse or allocate a page of ptes */
|
||||
if (pmd_present(pmd[pmdidx]))
|
||||
pte_page = m2v(pmd[pmdidx].pmd);
|
||||
else {
|
||||
/* Check for free pte pages */
|
||||
if (ident_pte == ARRAY_SIZE(level1_ident_pgt))
|
||||
break;
|
||||
|
||||
pte_page = &level1_ident_pgt[ident_pte];
|
||||
ident_pte += PTRS_PER_PTE;
|
||||
|
||||
pmd[pmdidx] = __pmd(__pa(pte_page) | _PAGE_TABLE);
|
||||
}
|
||||
|
||||
/* Install mappings */
|
||||
for (pteidx = 0; pteidx < PTRS_PER_PTE; pteidx++, pfn++) {
|
||||
pte_t pte;
|
||||
|
||||
if (pfn > max_pfn_mapped)
|
||||
max_pfn_mapped = pfn;
|
||||
|
||||
if (!pte_none(pte_page[pteidx]))
|
||||
continue;
|
||||
|
||||
pte = pfn_pte(pfn, PAGE_KERNEL_EXEC);
|
||||
pte_page[pteidx] = pte;
|
||||
}
|
||||
}
|
||||
|
||||
for (pteidx = 0; pteidx < ident_pte; pteidx += PTRS_PER_PTE)
|
||||
set_page_prot(&level1_ident_pgt[pteidx], PAGE_KERNEL_RO);
|
||||
|
||||
set_page_prot(pmd, PAGE_KERNEL_RO);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
static void convert_pfn_mfn(void *v)
|
||||
{
|
||||
pte_t *pte = v;
|
||||
int i;
|
||||
|
||||
/* All levels are converted the same way, so just treat them
|
||||
as ptes. */
|
||||
for (i = 0; i < PTRS_PER_PTE; i++)
|
||||
pte[i] = xen_make_pte(pte[i].pte);
|
||||
}
|
||||
|
||||
/*
|
||||
* Set up the inital kernel pagetable.
|
||||
*
|
||||
* We can construct this by grafting the Xen provided pagetable into
|
||||
* head_64.S's preconstructed pagetables. We copy the Xen L2's into
|
||||
* level2_ident_pgt, level2_kernel_pgt and level2_fixmap_pgt. This
|
||||
* means that only the kernel has a physical mapping to start with -
|
||||
* but that's enough to get __va working. We need to fill in the rest
|
||||
* of the physical mapping once some sort of allocator has been set
|
||||
* up.
|
||||
*/
|
||||
__init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
|
||||
unsigned long max_pfn)
|
||||
{
|
||||
pud_t *l3;
|
||||
pmd_t *l2;
|
||||
|
||||
/* Zap identity mapping */
|
||||
init_level4_pgt[0] = __pgd(0);
|
||||
|
||||
/* Pre-constructed entries are in pfn, so convert to mfn */
|
||||
convert_pfn_mfn(init_level4_pgt);
|
||||
convert_pfn_mfn(level3_ident_pgt);
|
||||
convert_pfn_mfn(level3_kernel_pgt);
|
||||
|
||||
l3 = m2v(pgd[pgd_index(__START_KERNEL_map)].pgd);
|
||||
l2 = m2v(l3[pud_index(__START_KERNEL_map)].pud);
|
||||
|
||||
memcpy(level2_ident_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
|
||||
memcpy(level2_kernel_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
|
||||
|
||||
l3 = m2v(pgd[pgd_index(__START_KERNEL_map + PMD_SIZE)].pgd);
|
||||
l2 = m2v(l3[pud_index(__START_KERNEL_map + PMD_SIZE)].pud);
|
||||
memcpy(level2_fixmap_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
|
||||
|
||||
/* Set up identity map */
|
||||
xen_map_identity_early(level2_ident_pgt, max_pfn);
|
||||
|
||||
/* Make pagetable pieces RO */
|
||||
set_page_prot(init_level4_pgt, PAGE_KERNEL_RO);
|
||||
set_page_prot(level3_ident_pgt, PAGE_KERNEL_RO);
|
||||
set_page_prot(level3_kernel_pgt, PAGE_KERNEL_RO);
|
||||
set_page_prot(level3_user_vsyscall, PAGE_KERNEL_RO);
|
||||
set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO);
|
||||
set_page_prot(level2_fixmap_pgt, PAGE_KERNEL_RO);
|
||||
|
||||
/* Pin down new L4 */
|
||||
pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE,
|
||||
PFN_DOWN(__pa_symbol(init_level4_pgt)));
|
||||
|
||||
/* Unpin Xen-provided one */
|
||||
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
|
||||
|
||||
/* Switch over */
|
||||
pgd = init_level4_pgt;
|
||||
|
||||
/*
|
||||
* At this stage there can be no user pgd, and no page
|
||||
* structure to attach it to, so make sure we just set kernel
|
||||
* pgd.
|
||||
*/
|
||||
xen_mc_batch();
|
||||
__xen_write_cr3(true, __pa(pgd));
|
||||
xen_mc_issue(PARAVIRT_LAZY_CPU);
|
||||
|
||||
reserve_early(__pa(xen_start_info->pt_base),
|
||||
__pa(xen_start_info->pt_base +
|
||||
xen_start_info->nr_pt_frames * PAGE_SIZE),
|
||||
"XEN PAGETABLES");
|
||||
|
||||
return pgd;
|
||||
}
|
||||
#else /* !CONFIG_X86_64 */
|
||||
static pmd_t level2_kernel_pgt[PTRS_PER_PMD] __page_aligned_bss;
|
||||
|
||||
__init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
|
||||
unsigned long max_pfn)
|
||||
{
|
||||
pmd_t *kernel_pmd;
|
||||
|
||||
init_pg_tables_start = __pa(pgd);
|
||||
init_pg_tables_end = __pa(pgd) + xen_start_info->nr_pt_frames*PAGE_SIZE;
|
||||
max_pfn_mapped = PFN_DOWN(init_pg_tables_end + 512*1024);
|
||||
|
||||
kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
|
||||
memcpy(level2_kernel_pgt, kernel_pmd, sizeof(pmd_t) * PTRS_PER_PMD);
|
||||
|
||||
xen_map_identity_early(level2_kernel_pgt, max_pfn);
|
||||
|
||||
memcpy(swapper_pg_dir, pgd, sizeof(pgd_t) * PTRS_PER_PGD);
|
||||
set_pgd(&swapper_pg_dir[KERNEL_PGD_BOUNDARY],
|
||||
__pgd(__pa(level2_kernel_pgt) | _PAGE_PRESENT));
|
||||
|
||||
set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO);
|
||||
set_page_prot(swapper_pg_dir, PAGE_KERNEL_RO);
|
||||
set_page_prot(empty_zero_page, PAGE_KERNEL_RO);
|
||||
|
||||
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
|
||||
|
||||
xen_write_cr3(__pa(swapper_pg_dir));
|
||||
|
||||
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(swapper_pg_dir)));
|
||||
|
||||
return swapper_pg_dir;
|
||||
}
|
||||
#endif /* CONFIG_X86_64 */
|
||||
|
||||
static void xen_set_fixmap(unsigned idx, unsigned long phys, pgprot_t prot)
|
||||
{
|
||||
pte_t pte;
|
||||
|
||||
phys >>= PAGE_SHIFT;
|
||||
|
||||
switch (idx) {
|
||||
case FIX_BTMAP_END ... FIX_BTMAP_BEGIN:
|
||||
#ifdef CONFIG_X86_F00F_BUG
|
||||
case FIX_F00F_IDT:
|
||||
#endif
|
||||
#ifdef CONFIG_X86_32
|
||||
case FIX_WP_TEST:
|
||||
case FIX_VDSO:
|
||||
# ifdef CONFIG_HIGHMEM
|
||||
case FIX_KMAP_BEGIN ... FIX_KMAP_END:
|
||||
# endif
|
||||
#else
|
||||
case VSYSCALL_LAST_PAGE ... VSYSCALL_FIRST_PAGE:
|
||||
#endif
|
||||
#ifdef CONFIG_X86_LOCAL_APIC
|
||||
case FIX_APIC_BASE: /* maps dummy local APIC */
|
||||
#endif
|
||||
pte = pfn_pte(phys, prot);
|
||||
break;
|
||||
|
||||
default:
|
||||
pte = mfn_pte(phys, prot);
|
||||
break;
|
||||
}
|
||||
|
||||
__native_set_fixmap(idx, pte);
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
/* Replicate changes to map the vsyscall page into the user
|
||||
pagetable vsyscall mapping. */
|
||||
if (idx >= VSYSCALL_LAST_PAGE && idx <= VSYSCALL_FIRST_PAGE) {
|
||||
unsigned long vaddr = __fix_to_virt(idx);
|
||||
set_pte_vaddr_pud(level3_user_vsyscall, vaddr, pte);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
__init void xen_post_allocator_init(void)
|
||||
{
|
||||
pv_mmu_ops.set_pte = xen_set_pte;
|
||||
pv_mmu_ops.set_pmd = xen_set_pmd;
|
||||
pv_mmu_ops.set_pud = xen_set_pud;
|
||||
#if PAGETABLE_LEVELS == 4
|
||||
pv_mmu_ops.set_pgd = xen_set_pgd;
|
||||
#endif
|
||||
|
||||
/* This will work as long as patching hasn't happened yet
|
||||
(which it hasn't) */
|
||||
pv_mmu_ops.alloc_pte = xen_alloc_pte;
|
||||
pv_mmu_ops.alloc_pmd = xen_alloc_pmd;
|
||||
pv_mmu_ops.release_pte = xen_release_pte;
|
||||
pv_mmu_ops.release_pmd = xen_release_pmd;
|
||||
#if PAGETABLE_LEVELS == 4
|
||||
pv_mmu_ops.alloc_pud = xen_alloc_pud;
|
||||
pv_mmu_ops.release_pud = xen_release_pud;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
SetPagePinned(virt_to_page(level3_user_vsyscall));
|
||||
#endif
|
||||
xen_mark_init_mm_pinned();
|
||||
}
|
||||
|
||||
|
||||
const struct pv_mmu_ops xen_mmu_ops __initdata = {
|
||||
.pagetable_setup_start = xen_pagetable_setup_start,
|
||||
.pagetable_setup_done = xen_pagetable_setup_done,
|
||||
|
||||
.read_cr2 = xen_read_cr2,
|
||||
.write_cr2 = xen_write_cr2,
|
||||
|
||||
.read_cr3 = xen_read_cr3,
|
||||
.write_cr3 = xen_write_cr3,
|
||||
|
||||
.flush_tlb_user = xen_flush_tlb,
|
||||
.flush_tlb_kernel = xen_flush_tlb,
|
||||
.flush_tlb_single = xen_flush_tlb_single,
|
||||
.flush_tlb_others = xen_flush_tlb_others,
|
||||
|
||||
.pte_update = paravirt_nop,
|
||||
.pte_update_defer = paravirt_nop,
|
||||
|
||||
.pgd_alloc = xen_pgd_alloc,
|
||||
.pgd_free = xen_pgd_free,
|
||||
|
||||
.alloc_pte = xen_alloc_pte_init,
|
||||
.release_pte = xen_release_pte_init,
|
||||
.alloc_pmd = xen_alloc_pte_init,
|
||||
.alloc_pmd_clone = paravirt_nop,
|
||||
.release_pmd = xen_release_pte_init,
|
||||
|
||||
#ifdef CONFIG_HIGHPTE
|
||||
.kmap_atomic_pte = xen_kmap_atomic_pte,
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
.set_pte = xen_set_pte,
|
||||
#else
|
||||
.set_pte = xen_set_pte_init,
|
||||
#endif
|
||||
.set_pte_at = xen_set_pte_at,
|
||||
.set_pmd = xen_set_pmd_hyper,
|
||||
|
||||
.ptep_modify_prot_start = __ptep_modify_prot_start,
|
||||
.ptep_modify_prot_commit = __ptep_modify_prot_commit,
|
||||
|
||||
.pte_val = xen_pte_val,
|
||||
.pgd_val = xen_pgd_val,
|
||||
|
||||
.make_pte = xen_make_pte,
|
||||
.make_pgd = xen_make_pgd,
|
||||
|
||||
#ifdef CONFIG_X86_PAE
|
||||
.set_pte_atomic = xen_set_pte_atomic,
|
||||
.set_pte_present = xen_set_pte_at,
|
||||
.pte_clear = xen_pte_clear,
|
||||
.pmd_clear = xen_pmd_clear,
|
||||
#endif /* CONFIG_X86_PAE */
|
||||
.set_pud = xen_set_pud_hyper,
|
||||
|
||||
.make_pmd = xen_make_pmd,
|
||||
.pmd_val = xen_pmd_val,
|
||||
|
||||
#if PAGETABLE_LEVELS == 4
|
||||
.pud_val = xen_pud_val,
|
||||
.make_pud = xen_make_pud,
|
||||
.set_pgd = xen_set_pgd_hyper,
|
||||
|
||||
.alloc_pud = xen_alloc_pte_init,
|
||||
.release_pud = xen_release_pte_init,
|
||||
#endif /* PAGETABLE_LEVELS == 4 */
|
||||
|
||||
.activate_mm = xen_activate_mm,
|
||||
.dup_mmap = xen_dup_mmap,
|
||||
.exit_mmap = xen_exit_mmap,
|
||||
|
||||
.lazy_mode = {
|
||||
.enter = paravirt_enter_lazy_mmu,
|
||||
.leave = xen_leave_lazy,
|
||||
},
|
||||
|
||||
.set_fixmap = xen_set_fixmap,
|
||||
};
|
||||
|
||||
|
||||
#ifdef CONFIG_XEN_DEBUG_FS
|
||||
|
||||
static struct dentry *d_mmu_debug;
|
||||
|
@ -54,4 +54,7 @@ pte_t xen_ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr, pte_t
|
||||
void xen_ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
|
||||
pte_t *ptep, pte_t pte);
|
||||
|
||||
unsigned long xen_read_cr2_direct(void);
|
||||
|
||||
extern const struct pv_mmu_ops xen_mmu_ops;
|
||||
#endif /* _XEN_MMU_H */
|
||||
|
@ -13,6 +13,7 @@ extern const char xen_failsafe_callback[];
|
||||
struct trap_info;
|
||||
void xen_copy_trap_info(struct trap_info *traps);
|
||||
|
||||
DECLARE_PER_CPU(struct vcpu_info, xen_vcpu_info);
|
||||
DECLARE_PER_CPU(unsigned long, xen_cr3);
|
||||
DECLARE_PER_CPU(unsigned long, xen_current_cr3);
|
||||
|
||||
@ -22,6 +23,13 @@ extern struct shared_info *HYPERVISOR_shared_info;
|
||||
|
||||
void xen_setup_mfn_list_list(void);
|
||||
void xen_setup_shared_info(void);
|
||||
void xen_setup_machphys_mapping(void);
|
||||
pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn);
|
||||
void xen_ident_map_ISA(void);
|
||||
void xen_reserve_top(void);
|
||||
|
||||
void xen_leave_lazy(void);
|
||||
void xen_post_allocator_init(void);
|
||||
|
||||
char * __init xen_memory_setup(void);
|
||||
void __init xen_arch_setup(void);
|
||||
|
Loading…
Reference in New Issue
Block a user