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Diffstat (limited to 'arch/i386/xen/enlighten.c')
| -rw-r--r-- | arch/i386/xen/enlighten.c | 1146 |
1 files changed, 0 insertions, 1146 deletions
diff --git a/arch/i386/xen/enlighten.c b/arch/i386/xen/enlighten.c deleted file mode 100644 index f01bfcd4bde..00000000000 --- a/arch/i386/xen/enlighten.c +++ /dev/null @@ -1,1146 +0,0 @@ -/* - * Core of Xen paravirt_ops implementation. - * - * This file contains the xen_paravirt_ops structure itself, and the - * implementations for: - * - privileged instructions - * - interrupt flags - * - segment operations - * - booting and setup - * - * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007 - */ - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/smp.h> -#include <linux/preempt.h> -#include <linux/hardirq.h> -#include <linux/percpu.h> -#include <linux/delay.h> -#include <linux/start_kernel.h> -#include <linux/sched.h> -#include <linux/bootmem.h> -#include <linux/module.h> -#include <linux/mm.h> -#include <linux/page-flags.h> -#include <linux/highmem.h> -#include <linux/smp.h> - -#include <xen/interface/xen.h> -#include <xen/interface/physdev.h> -#include <xen/interface/vcpu.h> -#include <xen/interface/sched.h> -#include <xen/features.h> -#include <xen/page.h> - -#include <asm/paravirt.h> -#include <asm/page.h> -#include <asm/xen/hypercall.h> -#include <asm/xen/hypervisor.h> -#include <asm/fixmap.h> -#include <asm/processor.h> -#include <asm/setup.h> -#include <asm/desc.h> -#include <asm/pgtable.h> -#include <asm/tlbflush.h> -#include <asm/reboot.h> - -#include "xen-ops.h" -#include "mmu.h" -#include "multicalls.h" - -EXPORT_SYMBOL_GPL(hypercall_page); - -DEFINE_PER_CPU(enum paravirt_lazy_mode, xen_lazy_mode); - -DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); -DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info); -DEFINE_PER_CPU(unsigned long, xen_cr3); - -struct start_info *xen_start_info; -EXPORT_SYMBOL_GPL(xen_start_info); - -static /* __initdata */ struct shared_info dummy_shared_info; - -/* - * Point at some empty memory to start with. We map the real shared_info - * page as soon as fixmap is up and running. - */ -struct shared_info *HYPERVISOR_shared_info = (void *)&dummy_shared_info; - -/* - * Flag to determine whether vcpu info placement is available on all - * VCPUs. We assume it is to start with, and then set it to zero on - * the first failure. This is because it can succeed on some VCPUs - * and not others, since it can involve hypervisor memory allocation, - * or because the guest failed to guarantee all the appropriate - * constraints on all VCPUs (ie buffer can't cross a page boundary). - * - * Note that any particular CPU may be using a placed vcpu structure, - * but we can only optimise if the all are. - * - * 0: not available, 1: available - */ -static int have_vcpu_info_placement = 1; - -static void __init xen_vcpu_setup(int cpu) -{ - struct vcpu_register_vcpu_info info; - int err; - struct vcpu_info *vcpup; - - per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; - - if (!have_vcpu_info_placement) - return; /* already tested, not available */ - - vcpup = &per_cpu(xen_vcpu_info, cpu); - - info.mfn = virt_to_mfn(vcpup); - info.offset = offset_in_page(vcpup); - - printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %x, offset %d\n", - cpu, vcpup, info.mfn, info.offset); - - /* Check to see if the hypervisor will put the vcpu_info - structure where we want it, which allows direct access via - a percpu-variable. */ - err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); - - if (err) { - printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err); - have_vcpu_info_placement = 0; - } else { - /* This cpu is using the registered vcpu info, even if - later ones fail to. */ - per_cpu(xen_vcpu, cpu) = vcpup; - - printk(KERN_DEBUG "cpu %d using vcpu_info at %p\n", - cpu, vcpup); - } -} - -static void __init xen_banner(void) -{ - printk(KERN_INFO "Booting paravirtualized kernel on %s\n", - paravirt_ops.name); - printk(KERN_INFO "Hypervisor signature: %s\n", xen_start_info->magic); -} - -static void xen_cpuid(unsigned int *eax, unsigned int *ebx, - unsigned int *ecx, unsigned int *edx) -{ - unsigned maskedx = ~0; - - /* - * Mask out inconvenient features, to try and disable as many - * unsupported kernel subsystems as possible. - */ - if (*eax == 1) - maskedx = ~((1 << X86_FEATURE_APIC) | /* disable APIC */ - (1 << X86_FEATURE_ACPI) | /* disable ACPI */ - (1 << X86_FEATURE_ACC)); /* thermal monitoring */ - - asm(XEN_EMULATE_PREFIX "cpuid" - : "=a" (*eax), - "=b" (*ebx), - "=c" (*ecx), - "=d" (*edx) - : "0" (*eax), "2" (*ecx)); - *edx &= maskedx; -} - -static void xen_set_debugreg(int reg, unsigned long val) -{ - HYPERVISOR_set_debugreg(reg, val); -} - -static unsigned long xen_get_debugreg(int reg) -{ - return HYPERVISOR_get_debugreg(reg); -} - -static unsigned long xen_save_fl(void) -{ - struct vcpu_info *vcpu; - unsigned long flags; - - vcpu = x86_read_percpu(xen_vcpu); - - /* flag has opposite sense of mask */ - flags = !vcpu->evtchn_upcall_mask; - - /* convert to IF type flag - -0 -> 0x00000000 - -1 -> 0xffffffff - */ - return (-flags) & X86_EFLAGS_IF; -} - -static void xen_restore_fl(unsigned long flags) -{ - struct vcpu_info *vcpu; - - /* convert from IF type flag */ - flags = !(flags & X86_EFLAGS_IF); - - /* There's a one instruction preempt window here. We need to - make sure we're don't switch CPUs between getting the vcpu - pointer and updating the mask. */ - preempt_disable(); - vcpu = x86_read_percpu(xen_vcpu); - vcpu->evtchn_upcall_mask = flags; - preempt_enable_no_resched(); - - /* Doesn't matter if we get preempted here, because any - pending event will get dealt with anyway. */ - - if (flags == 0) { - preempt_check_resched(); - barrier(); /* unmask then check (avoid races) */ - if (unlikely(vcpu->evtchn_upcall_pending)) - force_evtchn_callback(); - } -} - -static void xen_irq_disable(void) -{ - /* There's a one instruction preempt window here. We need to - make sure we're don't switch CPUs between getting the vcpu - pointer and updating the mask. */ - preempt_disable(); - x86_read_percpu(xen_vcpu)->evtchn_upcall_mask = 1; - preempt_enable_no_resched(); -} - -static void xen_irq_enable(void) -{ - struct vcpu_info *vcpu; - - /* There's a one instruction preempt window here. We need to - make sure we're don't switch CPUs between getting the vcpu - pointer and updating the mask. */ - preempt_disable(); - vcpu = x86_read_percpu(xen_vcpu); - vcpu->evtchn_upcall_mask = 0; - preempt_enable_no_resched(); - - /* Doesn't matter if we get preempted here, because any - pending event will get dealt with anyway. */ - - barrier(); /* unmask then check (avoid races) */ - if (unlikely(vcpu->evtchn_upcall_pending)) - force_evtchn_callback(); -} - -static void xen_safe_halt(void) -{ - /* Blocking includes an implicit local_irq_enable(). */ - if (HYPERVISOR_sched_op(SCHEDOP_block, 0) != 0) - BUG(); -} - -static void xen_halt(void) -{ - if (irqs_disabled()) - HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL); - else - xen_safe_halt(); -} - -static void xen_set_lazy_mode(enum paravirt_lazy_mode mode) -{ - BUG_ON(preemptible()); - - switch (mode) { - case PARAVIRT_LAZY_NONE: - BUG_ON(x86_read_percpu(xen_lazy_mode) == PARAVIRT_LAZY_NONE); - break; - - case PARAVIRT_LAZY_MMU: - case PARAVIRT_LAZY_CPU: - BUG_ON(x86_read_percpu(xen_lazy_mode) != PARAVIRT_LAZY_NONE); - break; - - case PARAVIRT_LAZY_FLUSH: - /* flush if necessary, but don't change state */ - if (x86_read_percpu(xen_lazy_mode) != PARAVIRT_LAZY_NONE) - xen_mc_flush(); - return; - } - - xen_mc_flush(); - x86_write_percpu(xen_lazy_mode, mode); -} - -static unsigned long xen_store_tr(void) -{ - return 0; -} - -static void xen_set_ldt(const void *addr, unsigned entries) -{ - unsigned long linear_addr = (unsigned long)addr; - struct mmuext_op *op; - struct multicall_space mcs = xen_mc_entry(sizeof(*op)); - - op = mcs.args; - op->cmd = MMUEXT_SET_LDT; - if (linear_addr) { - /* ldt my be vmalloced, use arbitrary_virt_to_machine */ - xmaddr_t maddr; - maddr = arbitrary_virt_to_machine((unsigned long)addr); - linear_addr = (unsigned long)maddr.maddr; - } - op->arg1.linear_addr = linear_addr; - op->arg2.nr_ents = entries; - - MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); - - xen_mc_issue(PARAVIRT_LAZY_CPU); -} - -static void xen_load_gdt(const struct Xgt_desc_struct *dtr) -{ - unsigned long *frames; - unsigned long va = dtr->address; - unsigned int size = dtr->size + 1; - unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; - int f; - struct multicall_space mcs; - - /* A GDT can be up to 64k in size, which corresponds to 8192 - 8-byte entries, or 16 4k pages.. */ - - BUG_ON(size > 65536); - BUG_ON(va & ~PAGE_MASK); - - mcs = xen_mc_entry(sizeof(*frames) * pages); - frames = mcs.args; - - for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) { - frames[f] = virt_to_mfn(va); - make_lowmem_page_readonly((void *)va); - } - - MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct)); - - xen_mc_issue(PARAVIRT_LAZY_CPU); -} - -static void load_TLS_descriptor(struct thread_struct *t, - unsigned int cpu, unsigned int i) -{ - struct desc_struct *gdt = get_cpu_gdt_table(cpu); - xmaddr_t maddr = virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]); - struct multicall_space mc = __xen_mc_entry(0); - - MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]); -} - -static void xen_load_tls(struct thread_struct *t, unsigned int cpu) -{ - xen_mc_batch(); - - load_TLS_descriptor(t, cpu, 0); - load_TLS_descriptor(t, cpu, 1); - load_TLS_descriptor(t, cpu, 2); - - xen_mc_issue(PARAVIRT_LAZY_CPU); - - /* - * XXX sleazy hack: If we're being called in a lazy-cpu zone, - * it means we're in a context switch, and %gs has just been - * saved. This means we can zero it out to prevent faults on - * exit from the hypervisor if the next process has no %gs. - * Either way, it has been saved, and the new value will get - * loaded properly. This will go away as soon as Xen has been - * modified to not save/restore %gs for normal hypercalls. - */ - if (xen_get_lazy_mode() == PARAVIRT_LAZY_CPU) - loadsegment(gs, 0); -} - -static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum, - u32 low, u32 high) -{ - unsigned long lp = (unsigned long)&dt[entrynum]; - xmaddr_t mach_lp = virt_to_machine(lp); - u64 entry = (u64)high << 32 | low; - - preempt_disable(); - - xen_mc_flush(); - if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry)) - BUG(); - - preempt_enable(); -} - -static int cvt_gate_to_trap(int vector, u32 low, u32 high, - struct trap_info *info) -{ - u8 type, dpl; - - type = (high >> 8) & 0x1f; - dpl = (high >> 13) & 3; - - if (type != 0xf && type != 0xe) - return 0; - - info->vector = vector; - info->address = (high & 0xffff0000) | (low & 0x0000ffff); - info->cs = low >> 16; - info->flags = dpl; - /* interrupt gates clear IF */ - if (type == 0xe) - info->flags |= 4; - - return 1; -} - -/* Locations of each CPU's IDT */ -static DEFINE_PER_CPU(struct Xgt_desc_struct, idt_desc); - -/* Set an IDT entry. If the entry is part of the current IDT, then - also update Xen. */ -static void xen_write_idt_entry(struct desc_struct *dt, int entrynum, - u32 low, u32 high) -{ - unsigned long p = (unsigned long)&dt[entrynum]; - unsigned long start, end; - - preempt_disable(); - - start = __get_cpu_var(idt_desc).address; - end = start + __get_cpu_var(idt_desc).size + 1; - - xen_mc_flush(); - - write_dt_entry(dt, entrynum, low, high); - - if (p >= start && (p + 8) <= end) { - struct trap_info info[2]; - - info[1].address = 0; - - if (cvt_gate_to_trap(entrynum, low, high, &info[0])) - if (HYPERVISOR_set_trap_table(info)) - BUG(); - } - - preempt_enable(); -} - -static void xen_convert_trap_info(const struct Xgt_desc_struct *desc, - struct trap_info *traps) -{ - unsigned in, out, count; - - count = (desc->size+1) / 8; - BUG_ON(count > 256); - - for (in = out = 0; in < count; in++) { - const u32 *entry = (u32 *)(desc->address + in * 8); - - if (cvt_gate_to_trap(in, entry[0], entry[1], &traps[out])) - out++; - } - traps[out].address = 0; -} - -void xen_copy_trap_info(struct trap_info *traps) -{ - const struct Xgt_desc_struct *desc = &__get_cpu_var(idt_desc); - - xen_convert_trap_info(desc, traps); -} - -/* Load a new IDT into Xen. In principle this can be per-CPU, so we - hold a spinlock to protect the static traps[] array (static because - it avoids allocation, and saves stack space). */ -static void xen_load_idt(const struct Xgt_desc_struct *desc) -{ - static DEFINE_SPINLOCK(lock); - static struct trap_info traps[257]; - - spin_lock(&lock); - - __get_cpu_var(idt_desc) = *desc; - - xen_convert_trap_info(desc, traps); - - xen_mc_flush(); - if (HYPERVISOR_set_trap_table(traps)) - BUG(); - - spin_unlock(&lock); -} - -/* Write a GDT descriptor entry. Ignore LDT descriptors, since - they're handled differently. */ -static void xen_write_gdt_entry(struct desc_struct *dt, int entry, - u32 low, u32 high) -{ - preempt_disable(); - - switch ((high >> 8) & 0xff) { - case DESCTYPE_LDT: - case DESCTYPE_TSS: - /* ignore */ - break; - - default: { - xmaddr_t maddr = virt_to_machine(&dt[entry]); - u64 desc = (u64)high << 32 | low; - - xen_mc_flush(); - if (HYPERVISOR_update_descriptor(maddr.maddr, desc)) - BUG(); - } - - } - - preempt_enable(); -} - -static void xen_load_esp0(struct tss_struct *tss, - struct thread_struct *thread) -{ - struct multicall_space mcs = xen_mc_entry(0); - MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->esp0); - xen_mc_issue(PARAVIRT_LAZY_CPU); -} - -static void xen_set_iopl_mask(unsigned mask) -{ - struct physdev_set_iopl set_iopl; - - /* Force the change at ring 0. */ - set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3; - HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl); -} - -static void xen_io_delay(void) -{ -} - -#ifdef CONFIG_X86_LOCAL_APIC -static unsigned long xen_apic_read(unsigned long reg) -{ - return 0; -} - -static void xen_apic_write(unsigned long reg, unsigned long val) -{ - /* Warn to see if there's any stray references */ - WARN_ON(1); -} -#endif - -static void xen_flush_tlb(void) -{ - struct mmuext_op *op; - struct multicall_space 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); -} - -static void xen_flush_tlb_single(unsigned long addr) -{ - struct mmuext_op *op; - struct multicall_space 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); -} - -static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm, - unsigned long va) -{ - struct { - struct mmuext_op op; - cpumask_t mask; - } *args; - cpumask_t cpumask = *cpus; - struct multicall_space mcs; - - /* - * A couple of (to be removed) sanity checks: - * - * - current CPU must not be in mask - * - mask must exist :) - */ - BUG_ON(cpus_empty(cpumask)); - BUG_ON(cpu_isset(smp_processor_id(), cpumask)); - BUG_ON(!mm); - - /* If a CPU which we ran on has gone down, OK. */ - cpus_and(cpumask, cpumask, cpu_online_map); - if (cpus_empty(cpumask)) - return; - - mcs = xen_mc_entry(sizeof(*args)); - args = mcs.args; - args->mask = cpumask; - args->op.arg2.vcpumask = &args->mask; - - 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); - - xen_mc_issue(PARAVIRT_LAZY_MMU); -} - -static void xen_write_cr2(unsigned long cr2) -{ - x86_read_percpu(xen_vcpu)->arch.cr2 = cr2; -} - -static unsigned long xen_read_cr2(void) -{ - return x86_read_percpu(xen_vcpu)->arch.cr2; -} - -static unsigned long xen_read_cr2_direct(void) -{ - return x86_read_percpu(xen_vcpu_info.arch.cr2); -} - -static void xen_write_cr4(unsigned long cr4) -{ - /* Just ignore cr4 changes; Xen doesn't allow us to do - anything anyway. */ -} - -static unsigned long xen_read_cr3(void) -{ - return x86_read_percpu(xen_cr3); -} - -static void xen_write_cr3(unsigned long cr3) -{ - BUG_ON(preemptible()); - - if (cr3 == x86_read_percpu(xen_cr3)) { - /* just a simple tlb flush */ - xen_flush_tlb(); - return; - } - - x86_write_percpu(xen_cr3, cr3); - - - { - struct mmuext_op *op; - struct multicall_space mcs = xen_mc_entry(sizeof(*op)); - unsigned long mfn = pfn_to_mfn(PFN_DOWN(cr3)); - - op = mcs.args; - op->cmd = MMUEXT_NEW_BASEPTR; - op->arg1.mfn = mfn; - - MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); - - xen_mc_issue(PARAVIRT_LAZY_CPU); - } -} - -/* Early in boot, while setting up the initial pagetable, assume - everything is pinned. */ -static __init void xen_alloc_pt_init(struct mm_struct *mm, u32 pfn) -{ - BUG_ON(mem_map); /* should only be used early */ - make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); -} - -/* This needs to make sure the new pte page is pinned iff its being - attached to a pinned pagetable. */ -static void xen_alloc_pt(struct mm_struct *mm, u32 pfn) -{ - struct page *page = pfn_to_page(pfn); - - if (PagePinned(virt_to_page(mm->pgd))) { - SetPagePinned(page); - - if (!PageHighMem(page)) - make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); - else - /* make sure there are no stray mappings of - this page */ - kmap_flush_unused(); - } -} - -/* This should never happen until we're OK to use struct page */ -static void xen_release_pt(u32 pfn) -{ - struct page *page = pfn_to_page(pfn); - - if (PagePinned(page)) { - if (!PageHighMem(page)) - make_lowmem_page_readwrite(__va(PFN_PHYS(pfn))); - } -} - -#ifdef CONFIG_HIGHPTE -static void *xen_kmap_atomic_pte(struct page *page, enum km_type type) -{ - pgprot_t prot = PAGE_KERNEL; - - if (PagePinned(page)) - prot = PAGE_KERNEL_RO; - - if (0 && PageHighMem(page)) - printk("mapping highpte %lx type %d prot %s\n", - page_to_pfn(page), type, - (unsigned long)pgprot_val(prot) & _PAGE_RW ? "WRITE" : "READ"); - - return kmap_atomic_prot(page, type, prot); -} -#endif - -static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte) -{ - /* If there's an existing pte, then don't allow _PAGE_RW to be set */ - if (pte_val_ma(*ptep) & _PAGE_PRESENT) - pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) & - pte_val_ma(pte)); - - return pte; -} - -/* Init-time set_pte while constructing initial pagetables, which - doesn't allow RO pagetable pages to be remapped RW */ -static __init void xen_set_pte_init(pte_t *ptep, pte_t pte) -{ - pte = mask_rw_pte(ptep, pte); - - xen_set_pte(ptep, pte); -} - -static __init void xen_pagetable_setup_start(pgd_t *base) -{ - pgd_t *xen_pgd = (pgd_t *)xen_start_info->pt_base; - - /* special set_pte for pagetable initialization */ - paravirt_ops.set_pte = xen_set_pte_init; - - init_mm.pgd = base; - /* - * copy top-level of Xen-supplied pagetable into place. For - * !PAE we can use this as-is, but for PAE it is a stand-in - * while we copy the pmd pages. - */ - memcpy(base, xen_pgd, PTRS_PER_PGD * sizeof(pgd_t)); - - if (PTRS_PER_PMD > 1) { - int i; - /* - * For PAE, need to allocate new pmds, rather than - * share Xen's, since Xen doesn't like pmd's being - * shared between address spaces. - */ - for (i = 0; i < PTRS_PER_PGD; i++) { - if (pgd_val_ma(xen_pgd[i]) & _PAGE_PRESENT) { - pmd_t *pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE); - - memcpy(pmd, (void *)pgd_page_vaddr(xen_pgd[i]), - PAGE_SIZE); - - make_lowmem_page_readonly(pmd); - - set_pgd(&base[i], __pgd(1 + __pa(pmd))); - } else - pgd_clear(&base[i]); - } - } - - /* make sure zero_page is mapped RO so we can use it in pagetables */ - make_lowmem_page_readonly(empty_zero_page); - make_lowmem_page_readonly(base); - /* - * Switch to new pagetable. This is done before - * pagetable_init has done anything so that the new pages - * added to the table can be prepared properly for Xen. - */ - xen_write_cr3(__pa(base)); -} - -static __init void xen_pagetable_setup_done(pgd_t *base) -{ - /* This will work as long as patching hasn't happened yet - (which it hasn't) */ - paravirt_ops.alloc_pt = xen_alloc_pt; - paravirt_ops.set_pte = xen_set_pte; - - if (!xen_feature(XENFEAT_auto_translated_physmap)) { - /* - * Create a mapping for the shared info page. - * Should be set_fixmap(), but shared_info is a machine - * address with no corresponding pseudo-phys address. - */ - set_pte_mfn(fix_to_virt(FIX_PARAVIRT_BOOTMAP), - PFN_DOWN(xen_start_info->shared_info), - PAGE_KERNEL); - - HYPERVISOR_shared_info = - (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP); - - } else - HYPERVISOR_shared_info = - (struct shared_info *)__va(xen_start_info->shared_info); - - /* Actually pin the pagetable down, but we can't set PG_pinned - yet because the page structures don't exist yet. */ - { - struct mmuext_op op; -#ifdef CONFIG_X86_PAE - op.cmd = MMUEXT_PIN_L3_TABLE; -#else - op.cmd = MMUEXT_PIN_L3_TABLE; -#endif - op.arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(base))); - if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF)) - BUG(); - } -} - -/* This is called once we have the cpu_possible_map */ -void __init xen_setup_vcpu_info_placement(void) -{ - int cpu; - - for_each_possible_cpu(cpu) - xen_vcpu_setup(cpu); - - /* xen_vcpu_setup managed to place the vcpu_info within the - percpu area for all cpus, so make use of it */ - if (have_vcpu_info_placement) { - printk(KERN_INFO "Xen: using vcpu_info placement\n"); - - paravirt_ops.save_fl = xen_save_fl_direct; - paravirt_ops.restore_fl = xen_restore_fl_direct; - paravirt_ops.irq_disable = xen_irq_disable_direct; - paravirt_ops.irq_enable = xen_irq_enable_direct; - paravirt_ops.read_cr2 = xen_read_cr2_direct; - paravirt_ops.iret = xen_iret_direct; - } -} - -static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf, - unsigned long addr, unsigned len) -{ - char *start, *end, *reloc; - unsigned ret; - - start = end = reloc = NULL; - -#define SITE(x) \ - case PARAVIRT_PATCH(x): \ - if (have_vcpu_info_placement) { \ - start = (char *)xen_##x##_direct; \ - end = xen_##x##_direct_end; \ - reloc = xen_##x##_direct_reloc; \ - } \ - goto patch_site - - switch (type) { - SITE(irq_enable); - SITE(irq_disable); - SITE(save_fl); - SITE(restore_fl); -#undef SITE - - patch_site: - if (start == NULL || (end-start) > len) - goto default_patch; - - ret = paravirt_patch_insns(insnbuf, len, start, end); - - /* Note: because reloc is assigned from something that - appears to be an array, gcc assumes it's non-null, - but doesn't know its relationship with start and - end. */ - if (reloc > start && reloc < end) { - int reloc_off = reloc - start; - long *relocp = (long *)(insnbuf + reloc_off); - long delta = start - (char *)addr; - - *relocp += delta; - } - break; - - default_patch: - default: - ret = paravirt_patch_default(type, clobbers, insnbuf, - addr, len); - break; - } - - return ret; -} - -static const struct paravirt_ops xen_paravirt_ops __initdata = { - .paravirt_enabled = 1, - .shared_kernel_pmd = 0, - - .name = "Xen", - .banner = xen_banner, - - .patch = xen_patch, - - .memory_setup = xen_memory_setup, - .arch_setup = xen_arch_setup, - .init_IRQ = xen_init_IRQ, - .post_allocator_init = xen_mark_init_mm_pinned, - - .time_init = xen_time_init, - .set_wallclock = xen_set_wallclock, - .get_wallclock = xen_get_wallclock, - .get_cpu_khz = xen_cpu_khz, - .sched_clock = xen_sched_clock, - - .cpuid = xen_cpuid, - - .set_debugreg = xen_set_debugreg, - .get_debugreg = xen_get_debugreg, - - .clts = native_clts, - - .read_cr0 = native_read_cr0, - .write_cr0 = native_write_cr0, - - .read_cr2 = xen_read_cr2, - .write_cr2 = xen_write_cr2, - - .read_cr3 = xen_read_cr3, - .write_cr3 = xen_write_cr3, - - .read_cr4 = native_read_cr4, - .read_cr4_safe = native_read_cr4_safe, - .write_cr4 = xen_write_cr4, - - .save_fl = xen_save_fl, - .restore_fl = xen_restore_fl, - .irq_disable = xen_irq_disable, - .irq_enable = xen_irq_enable, - .safe_halt = xen_safe_halt, - .halt = xen_halt, - .wbinvd = native_wbinvd, - - .read_msr = native_read_msr_safe, - .write_msr = native_write_msr_safe, - .read_tsc = native_read_tsc, - .read_pmc = native_read_pmc, - - .iret = (void *)&hypercall_page[__HYPERVISOR_iret], - .irq_enable_sysexit = NULL, /* never called */ - - .load_tr_desc = paravirt_nop, - .set_ldt = xen_set_ldt, - .load_gdt = xen_load_gdt, - .load_idt = xen_load_idt, - .load_tls = xen_load_tls, - - .store_gdt = native_store_gdt, - .store_idt = native_store_idt, - .store_tr = xen_store_tr, - - .write_ldt_entry = xen_write_ldt_entry, - .write_gdt_entry = xen_write_gdt_entry, - .write_idt_entry = xen_write_idt_entry, - .load_esp0 = xen_load_esp0, - - .set_iopl_mask = xen_set_iopl_mask, - .io_delay = xen_io_delay, - -#ifdef CONFIG_X86_LOCAL_APIC - .apic_write = xen_apic_write, - .apic_write_atomic = xen_apic_write, - .apic_read = xen_apic_read, - .setup_boot_clock = paravirt_nop, - .setup_secondary_clock = paravirt_nop, - .startup_ipi_hook = paravirt_nop, -#endif - - .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, - - .pagetable_setup_start = xen_pagetable_setup_start, - .pagetable_setup_done = xen_pagetable_setup_done, - - .alloc_pt = xen_alloc_pt_init, - .release_pt = xen_release_pt, - .alloc_pd = paravirt_nop, - .alloc_pd_clone = paravirt_nop, - .release_pd = paravirt_nop, - -#ifdef CONFIG_HIGHPTE - .kmap_atomic_pte = xen_kmap_atomic_pte, -#endif - - .set_pte = NULL, /* see xen_pagetable_setup_* */ - .set_pte_at = xen_set_pte_at, - .set_pmd = xen_set_pmd, - - .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, - .set_pud = xen_set_pud, - .pte_clear = xen_pte_clear, - .pmd_clear = xen_pmd_clear, - - .make_pmd = xen_make_pmd, - .pmd_val = xen_pmd_val, -#endif /* PAE */ - - .activate_mm = xen_activate_mm, - .dup_mmap = xen_dup_mmap, - .exit_mmap = xen_exit_mmap, - - .set_lazy_mode = xen_set_lazy_mode, -}; - -#ifdef CONFIG_SMP -static const struct smp_ops xen_smp_ops __initdata = { - .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu, - .smp_prepare_cpus = xen_smp_prepare_cpus, - .cpu_up = xen_cpu_up, - .smp_cpus_done = xen_smp_cpus_done, - - .smp_send_stop = xen_smp_send_stop, - .smp_send_reschedule = xen_smp_send_reschedule, - .smp_call_function_mask = xen_smp_call_function_mask, -}; -#endif /* CONFIG_SMP */ - -static void xen_reboot(int reason) -{ -#ifdef CONFIG_SMP - smp_send_stop(); -#endif - - if (HYPERVISOR_sched_op(SCHEDOP_shutdown, reason)) - BUG(); -} - -static void xen_restart(char *msg) -{ - xen_reboot(SHUTDOWN_reboot); -} - -static void xen_emergency_restart(void) -{ - xen_reboot(SHUTDOWN_reboot); -} - -static void xen_machine_halt(void) -{ - xen_reboot(SHUTDOWN_poweroff); -} - -static void xen_crash_shutdown(struct pt_regs *regs) -{ - xen_reboot(SHUTDOWN_crash); -} - -static const struct machine_ops __initdata xen_machine_ops = { - .restart = xen_restart, - .halt = xen_machine_halt, - .power_off = xen_machine_halt, - .shutdown = xen_machine_halt, - .crash_shutdown = xen_crash_shutdown, - .emergency_restart = xen_emergency_restart, -}; - - -/* First C function to be called on Xen boot */ -asmlinkage void __init xen_start_kernel(void) -{ - pgd_t *pgd; - - if (!xen_start_info) - return; - - BUG_ON(memcmp(xen_start_info->magic, "xen-3.0", 7) != 0); - - /* Install Xen paravirt ops */ - paravirt_ops = xen_paravirt_ops; - machine_ops = xen_machine_ops; - -#ifdef CONFIG_SMP - smp_ops = xen_smp_ops; -#endif - - xen_setup_features(); - - /* Get mfn list */ - if (!xen_feature(XENFEAT_auto_translated_physmap)) - phys_to_machine_mapping = (unsigned long *)xen_start_info->mfn_list; - - pgd = (pgd_t *)xen_start_info->pt_base; - - init_pg_tables_end = __pa(pgd) + xen_start_info->nr_pt_frames*PAGE_SIZE; - - init_mm.pgd = pgd; /* use the Xen pagetables to start */ - - /* keep using Xen gdt for now; no urgent need to change it */ - - x86_write_percpu(xen_cr3, __pa(pgd)); - -#ifdef CONFIG_SMP - /* Don't do the full vcpu_info placement stuff until we have a - possible map. */ - per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; -#else - /* May as well do it now, since there's no good time to call - it later on UP. */ - xen_setup_vcpu_info_placement(); -#endif - - paravirt_ops.kernel_rpl = 1; - if (xen_feature(XENFEAT_supervisor_mode_kernel)) - paravirt_ops.kernel_rpl = 0; - - /* set the limit of our address space */ - reserve_top_address(-HYPERVISOR_VIRT_START + 2 * PAGE_SIZE); - - /* set up basic CPUID stuff */ - cpu_detect(&new_cpu_data); - new_cpu_data.hard_math = 1; - new_cpu_data.x86_capability[0] = cpuid_edx(1); - - /* Poke various useful things into boot_params */ - LOADER_TYPE = (9 << 4) | 0; - INITRD_START = xen_start_info->mod_start ? __pa(xen_start_info->mod_start) : 0; - INITRD_SIZE = xen_start_info->mod_len; - - /* Start the world */ - start_kernel(); -} |