diff options
Diffstat (limited to 'arch/x86/xen/enlighten.c')
| -rw-r--r-- | arch/x86/xen/enlighten.c | 1817 |
1 files changed, 1220 insertions, 597 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 27ee26aedf9..ffb101e4573 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -11,6 +11,7 @@ * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007 */ +#include <linux/cpu.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/smp.h> @@ -20,67 +21,119 @@ #include <linux/delay.h> #include <linux/start_kernel.h> #include <linux/sched.h> +#include <linux/kprobes.h> #include <linux/bootmem.h> #include <linux/module.h> #include <linux/mm.h> #include <linux/page-flags.h> #include <linux/highmem.h> - +#include <linux/console.h> +#include <linux/pci.h> +#include <linux/gfp.h> +#include <linux/memblock.h> +#include <linux/edd.h> + +#include <xen/xen.h> +#include <xen/events.h> #include <xen/interface/xen.h> +#include <xen/interface/version.h> #include <xen/interface/physdev.h> #include <xen/interface/vcpu.h> -#include <xen/interface/sched.h> +#include <xen/interface/memory.h> +#include <xen/interface/xen-mca.h> #include <xen/features.h> #include <xen/page.h> +#include <xen/hvm.h> +#include <xen/hvc-console.h> +#include <xen/acpi.h> #include <asm/paravirt.h> +#include <asm/apic.h> #include <asm/page.h> +#include <asm/xen/pci.h> #include <asm/xen/hypercall.h> #include <asm/xen/hypervisor.h> #include <asm/fixmap.h> #include <asm/processor.h> +#include <asm/proto.h> +#include <asm/msr-index.h> +#include <asm/traps.h> #include <asm/setup.h> #include <asm/desc.h> +#include <asm/pgalloc.h> #include <asm/pgtable.h> #include <asm/tlbflush.h> #include <asm/reboot.h> +#include <asm/stackprotector.h> +#include <asm/hypervisor.h> +#include <asm/mwait.h> +#include <asm/pci_x86.h> +#include <asm/pat.h> + +#ifdef CONFIG_ACPI +#include <linux/acpi.h> +#include <asm/acpi.h> +#include <acpi/pdc_intel.h> +#include <acpi/processor.h> +#include <xen/interface/platform.h> +#endif #include "xen-ops.h" #include "mmu.h" +#include "smp.h" #include "multicalls.h" EXPORT_SYMBOL_GPL(hypercall_page); -DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); -DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info); - /* - * Note about cr3 (pagetable base) values: + * Pointer to the xen_vcpu_info structure or + * &HYPERVISOR_shared_info->vcpu_info[cpu]. See xen_hvm_init_shared_info + * and xen_vcpu_setup for details. By default it points to share_info->vcpu_info + * but if the hypervisor supports VCPUOP_register_vcpu_info then it can point + * to xen_vcpu_info. The pointer is used in __xen_evtchn_do_upcall to + * acknowledge pending events. + * Also more subtly it is used by the patched version of irq enable/disable + * e.g. xen_irq_enable_direct and xen_iret in PV mode. * - * 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. + * The desire to be able to do those mask/unmask operations as a single + * instruction by using the per-cpu offset held in %gs is the real reason + * vcpu info is in a per-cpu pointer and the original reason for this + * hypercall. * - * 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 */ +DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); + +/* + * Per CPU pages used if hypervisor supports VCPUOP_register_vcpu_info + * hypercall. This can be used both in PV and PVHVM mode. The structure + * overrides the default per_cpu(xen_vcpu, cpu) value. + */ +DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info); + +enum xen_domain_type xen_domain_type = XEN_NATIVE; +EXPORT_SYMBOL_GPL(xen_domain_type); + +unsigned long *machine_to_phys_mapping = (void *)MACH2PHYS_VIRT_START; +EXPORT_SYMBOL(machine_to_phys_mapping); +unsigned long machine_to_phys_nr; +EXPORT_SYMBOL(machine_to_phys_nr); struct start_info *xen_start_info; EXPORT_SYMBOL_GPL(xen_start_info); -static /* __initdata */ struct shared_info dummy_shared_info; +struct shared_info xen_dummy_shared_info; + +void *xen_initial_gdt; + +RESERVE_BRK(shared_info_page_brk, PAGE_SIZE); +__read_mostly int xen_have_vector_callback; +EXPORT_SYMBOL_GPL(xen_have_vector_callback); /* * 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; +struct shared_info *HYPERVISOR_shared_info = &xen_dummy_shared_info; /* * Flag to determine whether vcpu info placement is available on all @@ -97,65 +150,187 @@ struct shared_info *HYPERVISOR_shared_info = (void *)&dummy_shared_info; */ static int have_vcpu_info_placement = 1; -static void __init xen_vcpu_setup(int cpu) +struct tls_descs { + struct desc_struct desc[3]; +}; + +/* + * Updating the 3 TLS descriptors in the GDT on every task switch is + * surprisingly expensive so we avoid updating them if they haven't + * changed. Since Xen writes different descriptors than the one + * passed in the update_descriptor hypercall we keep shadow copies to + * compare against. + */ +static DEFINE_PER_CPU(struct tls_descs, shadow_tls_desc); + +static void clamp_max_cpus(void) +{ +#ifdef CONFIG_SMP + if (setup_max_cpus > MAX_VIRT_CPUS) + setup_max_cpus = MAX_VIRT_CPUS; +#endif +} + +static void xen_vcpu_setup(int cpu) { struct vcpu_register_vcpu_info info; int err; struct vcpu_info *vcpup; - BUG_ON(HYPERVISOR_shared_info == &dummy_shared_info); - per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; + BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info); - if (!have_vcpu_info_placement) - return; /* already tested, not available */ + /* + * This path is called twice on PVHVM - first during bootup via + * smp_init -> xen_hvm_cpu_notify, and then if the VCPU is being + * hotplugged: cpu_up -> xen_hvm_cpu_notify. + * As we can only do the VCPUOP_register_vcpu_info once lets + * not over-write its result. + * + * For PV it is called during restore (xen_vcpu_restore) and bootup + * (xen_setup_vcpu_info_placement). The hotplug mechanism does not + * use this function. + */ + if (xen_hvm_domain()) { + if (per_cpu(xen_vcpu, cpu) == &per_cpu(xen_vcpu_info, cpu)) + return; + } + if (cpu < MAX_VIRT_CPUS) + per_cpu(xen_vcpu,cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; - vcpup = &per_cpu(xen_vcpu_info, cpu); + if (!have_vcpu_info_placement) { + if (cpu >= MAX_VIRT_CPUS) + clamp_max_cpus(); + return; + } - info.mfn = virt_to_mfn(vcpup); + vcpup = &per_cpu(xen_vcpu_info, cpu); + info.mfn = arbitrary_virt_to_mfn(vcpup); info.offset = offset_in_page(vcpup); - printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %llx, 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. */ + a percpu-variable. + N.B. This hypercall can _only_ be called once per CPU. Subsequent + calls will error out with -EINVAL. This is due to the fact that + hypervisor has no unregister variant and this hypercall does not + allow to over-write info.mfn and info.offset. + */ 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; + clamp_max_cpus(); } 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); +/* + * On restore, set the vcpu placement up again. + * If it fails, then we're in a bad state, since + * we can't back out from using it... + */ +void xen_vcpu_restore(void) +{ + int cpu; + + for_each_possible_cpu(cpu) { + bool other_cpu = (cpu != smp_processor_id()); + bool is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL); + + if (other_cpu && is_up && + HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL)) + BUG(); + + xen_setup_runstate_info(cpu); + + if (have_vcpu_info_placement) + xen_vcpu_setup(cpu); + + if (other_cpu && is_up && + HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL)) + BUG(); } } static void __init xen_banner(void) { - printk(KERN_INFO "Booting paravirtualized kernel on %s\n", - pv_info.name); - printk(KERN_INFO "Hypervisor signature: %s\n", xen_start_info->magic); + unsigned version = HYPERVISOR_xen_version(XENVER_version, NULL); + struct xen_extraversion extra; + HYPERVISOR_xen_version(XENVER_extraversion, &extra); + + pr_info("Booting paravirtualized kernel %son %s\n", + xen_feature(XENFEAT_auto_translated_physmap) ? + "with PVH extensions " : "", pv_info.name); + printk(KERN_INFO "Xen version: %d.%d%s%s\n", + version >> 16, version & 0xffff, extra.extraversion, + xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : ""); +} +/* Check if running on Xen version (major, minor) or later */ +bool +xen_running_on_version_or_later(unsigned int major, unsigned int minor) +{ + unsigned int version; + + if (!xen_domain()) + return false; + + version = HYPERVISOR_xen_version(XENVER_version, NULL); + if ((((version >> 16) == major) && ((version & 0xffff) >= minor)) || + ((version >> 16) > major)) + return true; + return false; } +#define CPUID_THERM_POWER_LEAF 6 +#define APERFMPERF_PRESENT 0 + +static __read_mostly unsigned int cpuid_leaf1_edx_mask = ~0; +static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0; + +static __read_mostly unsigned int cpuid_leaf1_ecx_set_mask; +static __read_mostly unsigned int cpuid_leaf5_ecx_val; +static __read_mostly unsigned int cpuid_leaf5_edx_val; + static void xen_cpuid(unsigned int *ax, unsigned int *bx, unsigned int *cx, unsigned int *dx) { + unsigned maskebx = ~0; + unsigned maskecx = ~0; unsigned maskedx = ~0; - + unsigned setecx = 0; /* * Mask out inconvenient features, to try and disable as many * unsupported kernel subsystems as possible. */ - if (*ax == 1) - maskedx = ~((1 << X86_FEATURE_APIC) | /* disable APIC */ - (1 << X86_FEATURE_ACPI) | /* disable ACPI */ - (1 << X86_FEATURE_SEP) | /* disable SEP */ - (1 << X86_FEATURE_ACC)); /* thermal monitoring */ + switch (*ax) { + case 1: + maskecx = cpuid_leaf1_ecx_mask; + setecx = cpuid_leaf1_ecx_set_mask; + maskedx = cpuid_leaf1_edx_mask; + break; + + case CPUID_MWAIT_LEAF: + /* Synthesize the values.. */ + *ax = 0; + *bx = 0; + *cx = cpuid_leaf5_ecx_val; + *dx = cpuid_leaf5_edx_val; + return; + + case CPUID_THERM_POWER_LEAF: + /* Disabling APERFMPERF for kernel usage */ + maskecx = ~(1 << APERFMPERF_PRESENT); + break; + + case 0xb: + /* Suppress extended topology stuff */ + maskebx = 0; + break; + } asm(XEN_EMULATE_PREFIX "cpuid" : "=a" (*ax), @@ -163,111 +338,129 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx, "=c" (*cx), "=d" (*dx) : "0" (*ax), "2" (*cx)); + + *bx &= maskebx; + *cx &= maskecx; + *cx |= setecx; *dx &= maskedx; -} -static void xen_set_debugreg(int reg, unsigned long val) -{ - HYPERVISOR_set_debugreg(reg, val); } -static unsigned long xen_get_debugreg(int reg) +static bool __init xen_check_mwait(void) { - return HYPERVISOR_get_debugreg(reg); -} +#ifdef CONFIG_ACPI + struct xen_platform_op op = { + .cmd = XENPF_set_processor_pminfo, + .u.set_pminfo.id = -1, + .u.set_pminfo.type = XEN_PM_PDC, + }; + uint32_t buf[3]; + unsigned int ax, bx, cx, dx; + unsigned int mwait_mask; + + /* We need to determine whether it is OK to expose the MWAIT + * capability to the kernel to harvest deeper than C3 states from ACPI + * _CST using the processor_harvest_xen.c module. For this to work, we + * need to gather the MWAIT_LEAF values (which the cstate.c code + * checks against). The hypervisor won't expose the MWAIT flag because + * it would break backwards compatibility; so we will find out directly + * from the hardware and hypercall. + */ + if (!xen_initial_domain()) + return false; -static unsigned long xen_save_fl(void) -{ - struct vcpu_info *vcpu; - unsigned long flags; + /* + * When running under platform earlier than Xen4.2, do not expose + * mwait, to avoid the risk of loading native acpi pad driver + */ + if (!xen_running_on_version_or_later(4, 2)) + return false; - vcpu = x86_read_percpu(xen_vcpu); + ax = 1; + cx = 0; - /* flag has opposite sense of mask */ - flags = !vcpu->evtchn_upcall_mask; + native_cpuid(&ax, &bx, &cx, &dx); - /* convert to IF type flag - -0 -> 0x00000000 - -1 -> 0xffffffff - */ - return (-flags) & X86_EFLAGS_IF; -} + mwait_mask = (1 << (X86_FEATURE_EST % 32)) | + (1 << (X86_FEATURE_MWAIT % 32)); -static void xen_restore_fl(unsigned long flags) -{ - struct vcpu_info *vcpu; + if ((cx & mwait_mask) != mwait_mask) + return false; - /* convert from IF type flag */ - flags = !(flags & X86_EFLAGS_IF); + /* We need to emulate the MWAIT_LEAF and for that we need both + * ecx and edx. The hypercall provides only partial information. + */ - /* 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(); + ax = CPUID_MWAIT_LEAF; + bx = 0; + cx = 0; + dx = 0; + + native_cpuid(&ax, &bx, &cx, &dx); + + /* Ask the Hypervisor whether to clear ACPI_PDC_C_C2C3_FFH. If so, + * don't expose MWAIT_LEAF and let ACPI pick the IOPORT version of C3. + */ + buf[0] = ACPI_PDC_REVISION_ID; + buf[1] = 1; + buf[2] = (ACPI_PDC_C_CAPABILITY_SMP | ACPI_PDC_EST_CAPABILITY_SWSMP); + + set_xen_guest_handle(op.u.set_pminfo.pdc, buf); + + if ((HYPERVISOR_dom0_op(&op) == 0) && + (buf[2] & (ACPI_PDC_C_C1_FFH | ACPI_PDC_C_C2C3_FFH))) { + cpuid_leaf5_ecx_val = cx; + cpuid_leaf5_edx_val = dx; } + return true; +#else + return false; +#endif } - -static void xen_irq_disable(void) +static void __init xen_init_cpuid_mask(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(); -} + unsigned int ax, bx, cx, dx; + unsigned int xsave_mask; -static void xen_irq_enable(void) -{ - struct vcpu_info *vcpu; + cpuid_leaf1_edx_mask = + ~((1 << X86_FEATURE_MTRR) | /* disable MTRR */ + (1 << X86_FEATURE_ACC)); /* thermal monitoring */ - /* 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(); + if (!xen_initial_domain()) + cpuid_leaf1_edx_mask &= + ~((1 << X86_FEATURE_ACPI)); /* disable ACPI */ + + cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_X2APIC % 32)); - /* Doesn't matter if we get preempted here, because any - pending event will get dealt with anyway. */ + ax = 1; + cx = 0; + cpuid(1, &ax, &bx, &cx, &dx); - barrier(); /* unmask then check (avoid races) */ - if (unlikely(vcpu->evtchn_upcall_pending)) - force_evtchn_callback(); + xsave_mask = + (1 << (X86_FEATURE_XSAVE % 32)) | + (1 << (X86_FEATURE_OSXSAVE % 32)); + + /* Xen will set CR4.OSXSAVE if supported and not disabled by force */ + if ((cx & xsave_mask) != xsave_mask) + cpuid_leaf1_ecx_mask &= ~xsave_mask; /* disable XSAVE & OSXSAVE */ + if (xen_check_mwait()) + cpuid_leaf1_ecx_set_mask = (1 << (X86_FEATURE_MWAIT % 32)); } -static void xen_safe_halt(void) +static void xen_set_debugreg(int reg, unsigned long val) { - /* Blocking includes an implicit local_irq_enable(). */ - if (HYPERVISOR_sched_op(SCHEDOP_block, 0) != 0) - BUG(); + HYPERVISOR_set_debugreg(reg, val); } -static void xen_halt(void) +static unsigned long xen_get_debugreg(int reg) { - if (irqs_disabled()) - HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL); - else - xen_safe_halt(); + return HYPERVISOR_get_debugreg(reg); } -static void xen_leave_lazy(void) +static void xen_end_context_switch(struct task_struct *next) { - paravirt_leave_lazy(paravirt_get_lazy_mode()); xen_mc_flush(); + paravirt_end_context_switch(next); } static unsigned long xen_store_tr(void) @@ -275,11 +468,66 @@ static unsigned long xen_store_tr(void) return 0; } +/* + * Set the page permissions for a particular virtual address. If the + * address is a vmalloc mapping (or other non-linear mapping), then + * find the linear mapping of the page and also set its protections to + * match. + */ +static void set_aliased_prot(void *v, pgprot_t prot) +{ + int level; + pte_t *ptep; + pte_t pte; + unsigned long pfn; + struct page *page; + + ptep = lookup_address((unsigned long)v, &level); + BUG_ON(ptep == NULL); + + pfn = pte_pfn(*ptep); + page = pfn_to_page(pfn); + + pte = pfn_pte(pfn, prot); + + if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0)) + BUG(); + + if (!PageHighMem(page)) { + void *av = __va(PFN_PHYS(pfn)); + + if (av != v) + if (HYPERVISOR_update_va_mapping((unsigned long)av, pte, 0)) + BUG(); + } else + kmap_flush_unused(); +} + +static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries) +{ + const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE; + int i; + + for(i = 0; i < entries; i += entries_per_page) + set_aliased_prot(ldt + i, PAGE_KERNEL_RO); +} + +static void xen_free_ldt(struct desc_struct *ldt, unsigned entries) +{ + const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE; + int i; + + for(i = 0; i < entries; i += entries_per_page) + set_aliased_prot(ldt + i, PAGE_KERNEL); +} + static void xen_set_ldt(const void *addr, unsigned entries) { struct mmuext_op *op; struct multicall_space mcs = xen_mc_entry(sizeof(*op)); + trace_xen_cpu_set_ldt(addr, entries); + op = mcs.args; op->cmd = MMUEXT_SET_LDT; op->arg1.linear_addr = (unsigned long)addr; @@ -292,44 +540,142 @@ static void xen_set_ldt(const void *addr, unsigned entries) static void xen_load_gdt(const struct desc_ptr *dtr) { - unsigned long *frames; unsigned long va = dtr->address; unsigned int size = dtr->size + 1; unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; + unsigned long frames[pages]; 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.. */ + /* + * 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); + int level; + pte_t *ptep; + unsigned long pfn, mfn; + void *virt; + + /* + * The GDT is per-cpu and is in the percpu data area. + * That can be virtually mapped, so we need to do a + * page-walk to get the underlying MFN for the + * hypercall. The page can also be in the kernel's + * linear range, so we need to RO that mapping too. + */ + ptep = lookup_address(va, &level); + BUG_ON(ptep == NULL); + + pfn = pte_pfn(*ptep); + mfn = pfn_to_mfn(pfn); + virt = __va(PFN_PHYS(pfn)); + + frames[f] = mfn; + make_lowmem_page_readonly((void *)va); + make_lowmem_page_readonly(virt); } - MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct)); + if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct))) + BUG(); +} - xen_mc_issue(PARAVIRT_LAZY_CPU); +/* + * load_gdt for early boot, when the gdt is only mapped once + */ +static void __init xen_load_gdt_boot(const struct desc_ptr *dtr) +{ + unsigned long va = dtr->address; + unsigned int size = dtr->size + 1; + unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; + unsigned long frames[pages]; + int f; + + /* + * 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); + + for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) { + pte_t pte; + unsigned long pfn, mfn; + + pfn = virt_to_pfn(va); + mfn = pfn_to_mfn(pfn); + + pte = pfn_pte(pfn, PAGE_KERNEL_RO); + + if (HYPERVISOR_update_va_mapping((unsigned long)va, pte, 0)) + BUG(); + + frames[f] = mfn; + } + + if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct))) + BUG(); +} + +static inline bool desc_equal(const struct desc_struct *d1, + const struct desc_struct *d2) +{ + return d1->a == d2->a && d1->b == d2->b; } 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); + struct desc_struct *shadow = &per_cpu(shadow_tls_desc, cpu).desc[i]; + struct desc_struct *gdt; + xmaddr_t maddr; + struct multicall_space mc; + + if (desc_equal(shadow, &t->tls_array[i])) + return; + + *shadow = t->tls_array[i]; + + gdt = get_cpu_gdt_table(cpu); + maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]); + 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) { + /* + * XXX sleazy hack: If we're being called in a lazy-cpu zone + * and lazy gs handling is enabled, 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. + * + * On x86_64, this hack is not used for %gs, because gs points + * to KERNEL_GS_BASE (and uses it for PDA references), so we + * must not zero %gs on x86_64 + * + * For x86_64, we need to zero %fs, otherwise we may get an + * exception between the new %fs descriptor being loaded and + * %fs being effectively cleared at __switch_to(). + */ + if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) { +#ifdef CONFIG_X86_32 + lazy_load_gs(0); +#else + loadsegment(fs, 0); +#endif + } + xen_mc_batch(); load_TLS_descriptor(t, cpu, 0); @@ -337,27 +683,24 @@ static void xen_load_tls(struct thread_struct *t, unsigned int cpu) 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 (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) - loadsegment(gs, 0); +#ifdef CONFIG_X86_64 +static void xen_load_gs_index(unsigned int idx) +{ + if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, idx)) + BUG(); } +#endif static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum, const void *ptr) { - unsigned long lp = (unsigned long)&dt[entrynum]; - xmaddr_t mach_lp = virt_to_machine(lp); + xmaddr_t mach_lp = arbitrary_virt_to_machine(&dt[entrynum]); u64 entry = *(u64 *)ptr; + trace_xen_cpu_write_ldt_entry(dt, entrynum, entry); + preempt_disable(); xen_mc_flush(); @@ -367,24 +710,60 @@ static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum, preempt_enable(); } -static int cvt_gate_to_trap(int vector, u32 low, u32 high, +static int cvt_gate_to_trap(int vector, const gate_desc *val, struct trap_info *info) { - u8 type, dpl; + unsigned long addr; - type = (high >> 8) & 0x1f; - dpl = (high >> 13) & 3; - - if (type != 0xf && type != 0xe) + if (val->type != GATE_TRAP && val->type != GATE_INTERRUPT) return 0; info->vector = vector; - info->address = (high & 0xffff0000) | (low & 0x0000ffff); - info->cs = low >> 16; - info->flags = dpl; + + addr = gate_offset(*val); +#ifdef CONFIG_X86_64 + /* + * Look for known traps using IST, and substitute them + * appropriately. The debugger ones are the only ones we care + * about. Xen will handle faults like double_fault, + * so we should never see them. Warn if + * there's an unexpected IST-using fault handler. + */ + if (addr == (unsigned long)debug) + addr = (unsigned long)xen_debug; + else if (addr == (unsigned long)int3) + addr = (unsigned long)xen_int3; + else if (addr == (unsigned long)stack_segment) + addr = (unsigned long)xen_stack_segment; + else if (addr == (unsigned long)double_fault) { + /* Don't need to handle these */ + return 0; +#ifdef CONFIG_X86_MCE + } else if (addr == (unsigned long)machine_check) { + /* + * when xen hypervisor inject vMCE to guest, + * use native mce handler to handle it + */ + ; +#endif + } else if (addr == (unsigned long)nmi) + /* + * Use the native version as well. + */ + ; + else { + /* Some other trap using IST? */ + if (WARN_ON(val->ist != 0)) + return 0; + } +#endif /* CONFIG_X86_64 */ + info->address = addr; + + info->cs = gate_segment(*val); + info->flags = val->dpl; /* interrupt gates clear IF */ - if (type == 0xe) - info->flags |= 4; + if (val->type == GATE_INTERRUPT) + info->flags |= 1 << 2; return 1; } @@ -399,10 +778,12 @@ static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g) unsigned long p = (unsigned long)&dt[entrynum]; unsigned long start, end; + trace_xen_cpu_write_idt_entry(dt, entrynum, g); + preempt_disable(); - start = __get_cpu_var(idt_desc).address; - end = start + __get_cpu_var(idt_desc).size + 1; + start = __this_cpu_read(idt_desc.address); + end = start + __this_cpu_read(idt_desc.size) + 1; xen_mc_flush(); @@ -410,11 +791,10 @@ static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g) if (p >= start && (p + 8) <= end) { struct trap_info info[2]; - u32 *desc = (u32 *)g; info[1].address = 0; - if (cvt_gate_to_trap(entrynum, desc[0], desc[1], &info[0])) + if (cvt_gate_to_trap(entrynum, g, &info[0])) if (HYPERVISOR_set_trap_table(info)) BUG(); } @@ -427,13 +807,13 @@ static void xen_convert_trap_info(const struct desc_ptr *desc, { unsigned in, out, count; - count = (desc->size+1) / 8; + count = (desc->size+1) / sizeof(gate_desc); BUG_ON(count > 256); for (in = out = 0; in < count; in++) { - const u32 *entry = (u32 *)(desc->address + in * 8); + gate_desc *entry = (gate_desc*)(desc->address) + in; - if (cvt_gate_to_trap(in, entry[0], entry[1], &traps[out])) + if (cvt_gate_to_trap(in, entry, &traps[out])) out++; } traps[out].address = 0; @@ -454,6 +834,8 @@ static void xen_load_idt(const struct desc_ptr *desc) static DEFINE_SPINLOCK(lock); static struct trap_info traps[257]; + trace_xen_cpu_load_idt(desc); + spin_lock(&lock); __get_cpu_var(idt_desc) = *desc; @@ -472,6 +854,8 @@ static void xen_load_idt(const struct desc_ptr *desc) static void xen_write_gdt_entry(struct desc_struct *dt, int entry, const void *desc, int type) { + trace_xen_cpu_write_gdt_entry(dt, entry, desc, type); + preempt_disable(); switch (type) { @@ -481,7 +865,7 @@ static void xen_write_gdt_entry(struct desc_struct *dt, int entry, break; default: { - xmaddr_t maddr = virt_to_machine(&dt[entry]); + xmaddr_t maddr = arbitrary_virt_to_machine(&dt[entry]); xen_mc_flush(); if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc)) @@ -493,10 +877,37 @@ static void xen_write_gdt_entry(struct desc_struct *dt, int entry, preempt_enable(); } +/* + * Version of write_gdt_entry for use at early boot-time needed to + * update an entry as simply as possible. + */ +static void __init xen_write_gdt_entry_boot(struct desc_struct *dt, int entry, + const void *desc, int type) +{ + trace_xen_cpu_write_gdt_entry(dt, entry, desc, type); + + switch (type) { + case DESC_LDT: + case DESC_TSS: + /* ignore */ + break; + + default: { + xmaddr_t maddr = virt_to_machine(&dt[entry]); + + if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc)) + dt[entry] = *(struct desc_struct *)desc; + } + + } +} + static void xen_load_sp0(struct tss_struct *tss, - struct thread_struct *thread) + struct thread_struct *thread) { - struct multicall_space mcs = xen_mc_entry(0); + struct multicall_space mcs; + + mcs = xen_mc_entry(0); MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0); xen_mc_issue(PARAVIRT_LAZY_CPU); } @@ -515,325 +926,202 @@ static void xen_io_delay(void) } #ifdef CONFIG_X86_LOCAL_APIC -static u32 xen_apic_read(unsigned long reg) +static unsigned long xen_set_apic_id(unsigned int x) { - return 0; -} - -static void xen_apic_write(unsigned long reg, u32 val) -{ - /* Warn to see if there's any stray references */ WARN_ON(1); + return x; } -#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) +static unsigned int xen_get_apic_id(unsigned long x) { - 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); + return ((x)>>24) & 0xFFu; } - -static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm, - unsigned long va) +static u32 xen_apic_read(u32 reg) { - 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; + struct xen_platform_op op = { + .cmd = XENPF_get_cpuinfo, + .interface_version = XENPF_INTERFACE_VERSION, + .u.pcpu_info.xen_cpuid = 0, + }; + int ret = 0; + + /* Shouldn't need this as APIC is turned off for PV, and we only + * get called on the bootup processor. But just in case. */ + if (!xen_initial_domain() || smp_processor_id()) + return 0; - mcs = xen_mc_entry(sizeof(*args)); - args = mcs.args; - args->mask = cpumask; - args->op.arg2.vcpumask = &args->mask; + if (reg == APIC_LVR) + return 0x10; - 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; - } + if (reg != APIC_ID) + return 0; - MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF); + ret = HYPERVISOR_dom0_op(&op); + if (ret) + return 0; - xen_mc_issue(PARAVIRT_LAZY_MMU); + return op.u.pcpu_info.apic_id << 24; } -static void xen_write_cr2(unsigned long cr2) +static void xen_apic_write(u32 reg, u32 val) { - x86_read_percpu(xen_vcpu)->arch.cr2 = cr2; + /* Warn to see if there's any stray references */ + WARN_ON(1); } -static unsigned long xen_read_cr2(void) +static u64 xen_apic_icr_read(void) { - return x86_read_percpu(xen_vcpu)->arch.cr2; + return 0; } -static unsigned long xen_read_cr2_direct(void) +static void xen_apic_icr_write(u32 low, u32 id) { - return x86_read_percpu(xen_vcpu_info.arch.cr2); + /* Warn to see if there's any stray references */ + WARN_ON(1); } -static void xen_write_cr4(unsigned long cr4) +static void xen_apic_wait_icr_idle(void) { - /* Just ignore cr4 changes; Xen doesn't allow us to do - anything anyway. */ + return; } -static unsigned long xen_read_cr3(void) +static u32 xen_safe_apic_wait_icr_idle(void) { - return x86_read_percpu(xen_cr3); + return 0; } -static void set_current_cr3(void *v) +static void set_xen_basic_apic_ops(void) { - x86_write_percpu(xen_current_cr3, (unsigned long)v); + apic->read = xen_apic_read; + apic->write = xen_apic_write; + apic->icr_read = xen_apic_icr_read; + apic->icr_write = xen_apic_icr_write; + apic->wait_icr_idle = xen_apic_wait_icr_idle; + apic->safe_wait_icr_idle = xen_safe_apic_wait_icr_idle; + apic->set_apic_id = xen_set_apic_id; + apic->get_apic_id = xen_get_apic_id; + +#ifdef CONFIG_SMP + apic->send_IPI_allbutself = xen_send_IPI_allbutself; + apic->send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself; + apic->send_IPI_mask = xen_send_IPI_mask; + apic->send_IPI_all = xen_send_IPI_all; + apic->send_IPI_self = xen_send_IPI_self; +#endif } -static void xen_write_cr3(unsigned long cr3) +#endif + +static void xen_clts(void) { - struct mmuext_op *op; struct multicall_space mcs; - unsigned long mfn = pfn_to_mfn(PFN_DOWN(cr3)); - - BUG_ON(preemptible()); - - mcs = xen_mc_entry(sizeof(*op)); /* disables interrupts */ - /* Update while interrupts are disabled, so its atomic with - respect to ipis */ - x86_write_percpu(xen_cr3, cr3); + mcs = xen_mc_entry(0); - op = mcs.args; - op->cmd = MMUEXT_NEW_BASEPTR; - op->arg1.mfn = mfn; - - MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); - - /* Update xen_update_cr3 once the batch has actually - been submitted. */ - xen_mc_callback(set_current_cr3, (void *)cr3); - - xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */ -} - -/* 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))); -} + MULTI_fpu_taskswitch(mcs.mc, 0); -/* Early release_pt assumes that all pts are pinned, since there's - only init_mm and anything attached to that is pinned. */ -static void xen_release_pt_init(u32 pfn) -{ - make_lowmem_page_readwrite(__va(PFN_PHYS(pfn))); + xen_mc_issue(PARAVIRT_LAZY_CPU); } -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(); -} +static DEFINE_PER_CPU(unsigned long, xen_cr0_value); -/* 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, u32 pfn, unsigned level) +static unsigned long xen_read_cr0(void) { - struct page *page = pfn_to_page(pfn); - - if (PagePinned(virt_to_page(mm->pgd))) { - SetPagePinned(page); + unsigned long cr0 = this_cpu_read(xen_cr0_value); - if (!PageHighMem(page)) { - make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); - if (level == PT_PTE) - pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn); - } else - /* make sure there are no stray mappings of - this page */ - kmap_flush_unused(); + if (unlikely(cr0 == 0)) { + cr0 = native_read_cr0(); + this_cpu_write(xen_cr0_value, cr0); } -} -static void xen_alloc_pt(struct mm_struct *mm, u32 pfn) -{ - xen_alloc_ptpage(mm, pfn, PT_PTE); + return cr0; } -static void xen_alloc_pd(struct mm_struct *mm, u32 pfn) +static void xen_write_cr0(unsigned long cr0) { - xen_alloc_ptpage(mm, pfn, PT_PMD); -} + struct multicall_space mcs; -/* This should never happen until we're OK to use struct page */ -static void xen_release_ptpage(u32 pfn, unsigned level) -{ - struct page *page = pfn_to_page(pfn); + this_cpu_write(xen_cr0_value, cr0); - if (PagePinned(page)) { - if (!PageHighMem(page)) { - if (level == PT_PTE) - pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn); - make_lowmem_page_readwrite(__va(PFN_PHYS(pfn))); - } - ClearPagePinned(page); - } -} + /* Only pay attention to cr0.TS; everything else is + ignored. */ + mcs = xen_mc_entry(0); -static void xen_release_pt(u32 pfn) -{ - xen_release_ptpage(pfn, PT_PTE); -} + MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0); -static void xen_release_pd(u32 pfn) -{ - xen_release_ptpage(pfn, PT_PMD); + xen_mc_issue(PARAVIRT_LAZY_CPU); } -#ifdef CONFIG_HIGHPTE -static void *xen_kmap_atomic_pte(struct page *page, enum km_type type) +static void xen_write_cr4(unsigned long cr4) { - 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"); + cr4 &= ~X86_CR4_PGE; + cr4 &= ~X86_CR4_PSE; - return kmap_atomic_prot(page, type, prot); + native_write_cr4(cr4); } -#endif - -static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte) +#ifdef CONFIG_X86_64 +static inline unsigned long xen_read_cr8(void) { - /* 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; + return 0; } - -/* 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) +static inline void xen_write_cr8(unsigned long val) { - pte = mask_rw_pte(ptep, pte); - - xen_set_pte(ptep, pte); + BUG_ON(val); } - -static __init void xen_pagetable_setup_start(pgd_t *base) +#endif +static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high) { - pgd_t *xen_pgd = (pgd_t *)xen_start_info->pt_base; + int ret; - /* special set_pte for pagetable initialization */ - pv_mmu_ops.set_pte = xen_set_pte_init; + ret = 0; - 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)); + switch (msr) { +#ifdef CONFIG_X86_64 + unsigned which; + u64 base; - 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); + case MSR_FS_BASE: which = SEGBASE_FS; goto set; + case MSR_KERNEL_GS_BASE: which = SEGBASE_GS_USER; goto set; + case MSR_GS_BASE: which = SEGBASE_GS_KERNEL; goto set; - memcpy(pmd, (void *)pgd_page_vaddr(xen_pgd[i]), - PAGE_SIZE); + set: + base = ((u64)high << 32) | low; + if (HYPERVISOR_set_segment_base(which, base) != 0) + ret = -EIO; + break; +#endif - make_lowmem_page_readonly(pmd); + case MSR_STAR: + case MSR_CSTAR: + case MSR_LSTAR: + case MSR_SYSCALL_MASK: + case MSR_IA32_SYSENTER_CS: + case MSR_IA32_SYSENTER_ESP: + case MSR_IA32_SYSENTER_EIP: + /* Fast syscall setup is all done in hypercalls, so + these are all ignored. Stub them out here to stop + Xen console noise. */ + break; - set_pgd(&base[i], __pgd(1 + __pa(pmd))); - } else - pgd_clear(&base[i]); - } - } + case MSR_IA32_CR_PAT: + if (smp_processor_id() == 0) + xen_set_pat(((u64)high << 32) | low); + break; - /* 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)); + default: + ret = native_write_msr_safe(msr, low, high); + } - /* Unpin initial Xen pagetable */ - pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, - PFN_DOWN(__pa(xen_start_info->pt_base))); + return ret; } -static __init void setup_shared_info(void) +void xen_setup_shared_info(void) { if (!xen_feature(XENFEAT_auto_translated_physmap)) { - unsigned long addr = fix_to_virt(FIX_PARAVIRT_BOOTMAP); - - /* - * 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(addr, - PFN_DOWN(xen_start_info->shared_info), - PAGE_KERNEL); + set_fixmap(FIX_PARAVIRT_BOOTMAP, + xen_start_info->shared_info); - HYPERVISOR_shared_info = (struct shared_info *)addr; + 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); @@ -842,37 +1130,12 @@ static __init void setup_shared_info(void) /* In UP this is as good a place as any to set up shared info */ xen_setup_vcpu_info_placement(); #endif -} - -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) */ - pv_mmu_ops.alloc_pt = xen_alloc_pt; - pv_mmu_ops.alloc_pd = xen_alloc_pd; - pv_mmu_ops.release_pt = xen_release_pt; - pv_mmu_ops.release_pd = xen_release_pd; - pv_mmu_ops.set_pte = xen_set_pte; - - setup_shared_info(); - - /* Actually pin the pagetable down, but we can't set PG_pinned - yet because the page structures don't exist yet. */ - { - unsigned level; - -#ifdef CONFIG_X86_PAE - level = MMUEXT_PIN_L3_TABLE; -#else - level = MMUEXT_PIN_L2_TABLE; -#endif - pin_pagetable_pfn(level, PFN_DOWN(__pa(base))); - } + xen_setup_mfn_list_list(); } -/* This is called once we have the cpu_possible_map */ -void __init xen_setup_vcpu_info_placement(void) +/* This is called once we have the cpu_possible_mask */ +void xen_setup_vcpu_info_placement(void) { int cpu; @@ -880,16 +1143,14 @@ void __init xen_setup_vcpu_info_placement(void) 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"); - - pv_irq_ops.save_fl = xen_save_fl_direct; - pv_irq_ops.restore_fl = xen_restore_fl_direct; - pv_irq_ops.irq_disable = xen_irq_disable_direct; - pv_irq_ops.irq_enable = xen_irq_enable_direct; + * percpu area for all cpus, so make use of it. Note that for + * PVH we want to use native IRQ mechanism. */ + if (have_vcpu_info_placement && !xen_pvh_domain()) { + pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct); + pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct); + pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct); + pv_irq_ops.irq_enable = __PV_IS_CALLEE_SAVE(xen_irq_enable_direct); pv_mmu_ops.read_cr2 = xen_read_cr2_direct; - pv_cpu_ops.iret = xen_iret_direct; } } @@ -946,63 +1207,70 @@ static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf, return ret; } -static const struct pv_info xen_info __initdata = { +static const struct pv_info xen_info __initconst = { .paravirt_enabled = 1, .shared_kernel_pmd = 0, +#ifdef CONFIG_X86_64 + .extra_user_64bit_cs = FLAT_USER_CS64, +#endif + .name = "Xen", }; -static const struct pv_init_ops xen_init_ops __initdata = { +static const struct pv_init_ops xen_init_ops __initconst = { .patch = xen_patch, - - .banner = xen_banner, - .memory_setup = xen_memory_setup, - .arch_setup = xen_arch_setup, - .post_allocator_init = xen_mark_init_mm_pinned, -}; - -static const struct pv_time_ops xen_time_ops __initdata = { - .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, }; -static const struct pv_cpu_ops xen_cpu_ops __initdata = { +static const struct pv_cpu_ops xen_cpu_ops __initconst = { .cpuid = xen_cpuid, .set_debugreg = xen_set_debugreg, .get_debugreg = xen_get_debugreg, - .clts = native_clts, + .clts = xen_clts, - .read_cr0 = native_read_cr0, - .write_cr0 = native_write_cr0, + .read_cr0 = xen_read_cr0, + .write_cr0 = xen_write_cr0, .read_cr4 = native_read_cr4, .read_cr4_safe = native_read_cr4_safe, .write_cr4 = xen_write_cr4, +#ifdef CONFIG_X86_64 + .read_cr8 = xen_read_cr8, + .write_cr8 = xen_write_cr8, +#endif + .wbinvd = native_wbinvd, .read_msr = native_read_msr_safe, - .write_msr = native_write_msr_safe, + .write_msr = xen_write_msr_safe, + .read_tsc = native_read_tsc, .read_pmc = native_read_pmc, - .iret = (void *)&hypercall_page[__HYPERVISOR_iret], - .irq_enable_syscall_ret = NULL, /* never called */ + .read_tscp = native_read_tscp, + + .iret = xen_iret, + .irq_enable_sysexit = xen_sysexit, +#ifdef CONFIG_X86_64 + .usergs_sysret32 = xen_sysret32, + .usergs_sysret64 = xen_sysret64, +#endif .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, +#ifdef CONFIG_X86_64 + .load_gs_index = xen_load_gs_index, +#endif + + .alloc_ldt = xen_alloc_ldt, + .free_ldt = xen_free_ldt, - .store_gdt = native_store_gdt, .store_idt = native_store_idt, .store_tr = xen_store_tr, @@ -1014,112 +1282,24 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = { .set_iopl_mask = xen_set_iopl_mask, .io_delay = xen_io_delay, - .lazy_mode = { - .enter = paravirt_enter_lazy_cpu, - .leave = xen_leave_lazy, - }, -}; + /* Xen takes care of %gs when switching to usermode for us */ + .swapgs = paravirt_nop, -static const struct pv_irq_ops xen_irq_ops __initdata = { - .init_IRQ = xen_init_IRQ, - .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, + .start_context_switch = paravirt_start_context_switch, + .end_context_switch = xen_end_context_switch, }; -static const struct pv_apic_ops xen_apic_ops __initdata = { +static const struct pv_apic_ops xen_apic_ops __initconst = { #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 }; -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, - - .alloc_pt = xen_alloc_pt_init, - .release_pt = xen_release_pt_init, - .alloc_pd = xen_alloc_pt_init, - .alloc_pd_clone = paravirt_nop, - .release_pd = xen_release_pt_init, - -#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, - - .lazy_mode = { - .enter = paravirt_enter_lazy_mmu, - .leave = xen_leave_lazy, - }, -}; - -#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 + struct sched_shutdown r = { .reason = reason }; - if (HYPERVISOR_sched_op(SCHEDOP_shutdown, reason)) + if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r)) BUG(); } @@ -1138,96 +1318,539 @@ static void xen_machine_halt(void) xen_reboot(SHUTDOWN_poweroff); } +static void xen_machine_power_off(void) +{ + if (pm_power_off) + pm_power_off(); + 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 = { +static int +xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr) +{ + xen_reboot(SHUTDOWN_crash); + return NOTIFY_DONE; +} + +static struct notifier_block xen_panic_block = { + .notifier_call= xen_panic_event, + .priority = INT_MIN +}; + +int xen_panic_handler_init(void) +{ + atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block); + return 0; +} + +static const struct machine_ops xen_machine_ops __initconst = { .restart = xen_restart, .halt = xen_machine_halt, - .power_off = xen_machine_halt, + .power_off = xen_machine_power_off, .shutdown = xen_machine_halt, .crash_shutdown = xen_crash_shutdown, .emergency_restart = xen_emergency_restart, }; +static void __init xen_boot_params_init_edd(void) +{ +#if IS_ENABLED(CONFIG_EDD) + struct xen_platform_op op; + struct edd_info *edd_info; + u32 *mbr_signature; + unsigned nr; + int ret; + + edd_info = boot_params.eddbuf; + mbr_signature = boot_params.edd_mbr_sig_buffer; + + op.cmd = XENPF_firmware_info; + + op.u.firmware_info.type = XEN_FW_DISK_INFO; + for (nr = 0; nr < EDDMAXNR; nr++) { + struct edd_info *info = edd_info + nr; + + op.u.firmware_info.index = nr; + info->params.length = sizeof(info->params); + set_xen_guest_handle(op.u.firmware_info.u.disk_info.edd_params, + &info->params); + ret = HYPERVISOR_dom0_op(&op); + if (ret) + break; + +#define C(x) info->x = op.u.firmware_info.u.disk_info.x + C(device); + C(version); + C(interface_support); + C(legacy_max_cylinder); + C(legacy_max_head); + C(legacy_sectors_per_track); +#undef C + } + boot_params.eddbuf_entries = nr; + + op.u.firmware_info.type = XEN_FW_DISK_MBR_SIGNATURE; + for (nr = 0; nr < EDD_MBR_SIG_MAX; nr++) { + op.u.firmware_info.index = nr; + ret = HYPERVISOR_dom0_op(&op); + if (ret) + break; + mbr_signature[nr] = op.u.firmware_info.u.disk_mbr_signature.mbr_signature; + } + boot_params.edd_mbr_sig_buf_entries = nr; +#endif +} -static void __init xen_reserve_top(void) +/* + * Set up the GDT and segment registers for -fstack-protector. Until + * we do this, we have to be careful not to call any stack-protected + * function, which is most of the kernel. + * + * Note, that it is __ref because the only caller of this after init + * is PVH which is not going to use xen_load_gdt_boot or other + * __init functions. + */ +static void __ref xen_setup_gdt(int cpu) { - unsigned long top = HYPERVISOR_VIRT_START; - struct xen_platform_parameters pp; + if (xen_feature(XENFEAT_auto_translated_physmap)) { +#ifdef CONFIG_X86_64 + unsigned long dummy; + + load_percpu_segment(cpu); /* We need to access per-cpu area */ + switch_to_new_gdt(cpu); /* GDT and GS set */ + + /* We are switching of the Xen provided GDT to our HVM mode + * GDT. The new GDT has __KERNEL_CS with CS.L = 1 + * and we are jumping to reload it. + */ + asm volatile ("pushq %0\n" + "leaq 1f(%%rip),%0\n" + "pushq %0\n" + "lretq\n" + "1:\n" + : "=&r" (dummy) : "0" (__KERNEL_CS)); - if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0) - top = pp.virt_start; + /* + * While not needed, we also set the %es, %ds, and %fs + * to zero. We don't care about %ss as it is NULL. + * Strictly speaking this is not needed as Xen zeros those + * out (and also MSR_FS_BASE, MSR_GS_BASE, MSR_KERNEL_GS_BASE) + * + * Linux zeros them in cpu_init() and in secondary_startup_64 + * (for BSP). + */ + loadsegment(es, 0); + loadsegment(ds, 0); + loadsegment(fs, 0); +#else + /* PVH: TODO Implement. */ + BUG(); +#endif + return; /* PVH does not need any PV GDT ops. */ + } + pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry_boot; + pv_cpu_ops.load_gdt = xen_load_gdt_boot; - reserve_top_address(-top + 2 * PAGE_SIZE); + setup_stack_canary_segment(0); + switch_to_new_gdt(0); + + pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry; + pv_cpu_ops.load_gdt = xen_load_gdt; +} + +/* + * A PV guest starts with default flags that are not set for PVH, set them + * here asap. + */ +static void xen_pvh_set_cr_flags(int cpu) +{ + + /* Some of these are setup in 'secondary_startup_64'. The others: + * X86_CR0_TS, X86_CR0_PE, X86_CR0_ET are set by Xen for HVM guests + * (which PVH shared codepaths), while X86_CR0_PG is for PVH. */ + write_cr0(read_cr0() | X86_CR0_MP | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM); + + if (!cpu) + return; + /* + * For BSP, PSE PGE are set in probe_page_size_mask(), for APs + * set them here. For all, OSFXSR OSXMMEXCPT are set in fpu_init. + */ + if (cpu_has_pse) + set_in_cr4(X86_CR4_PSE); + + if (cpu_has_pge) + set_in_cr4(X86_CR4_PGE); +} + +/* + * Note, that it is ref - because the only caller of this after init + * is PVH which is not going to use xen_load_gdt_boot or other + * __init functions. + */ +void __ref xen_pvh_secondary_vcpu_init(int cpu) +{ + xen_setup_gdt(cpu); + xen_pvh_set_cr_flags(cpu); +} + +static void __init xen_pvh_early_guest_init(void) +{ + if (!xen_feature(XENFEAT_auto_translated_physmap)) + return; + + if (!xen_feature(XENFEAT_hvm_callback_vector)) + return; + + xen_have_vector_callback = 1; + xen_pvh_set_cr_flags(0); + +#ifdef CONFIG_X86_32 + BUG(); /* PVH: Implement proper support. */ +#endif } /* First C function to be called on Xen boot */ -asmlinkage void __init xen_start_kernel(void) +asmlinkage __visible void __init xen_start_kernel(void) { - pgd_t *pgd; + struct physdev_set_iopl set_iopl; + int rc; if (!xen_start_info) return; - BUG_ON(memcmp(xen_start_info->magic, "xen-3", 5) != 0); + xen_domain_type = XEN_PV_DOMAIN; + + xen_setup_features(); + xen_pvh_early_guest_init(); + xen_setup_machphys_mapping(); /* Install Xen paravirt ops */ pv_info = xen_info; pv_init_ops = xen_init_ops; - pv_time_ops = xen_time_ops; - pv_cpu_ops = xen_cpu_ops; - pv_irq_ops = xen_irq_ops; pv_apic_ops = xen_apic_ops; - pv_mmu_ops = xen_mmu_ops; + if (!xen_pvh_domain()) + pv_cpu_ops = xen_cpu_ops; - machine_ops = xen_machine_ops; + if (xen_feature(XENFEAT_auto_translated_physmap)) + x86_init.resources.memory_setup = xen_auto_xlated_memory_setup; + else + x86_init.resources.memory_setup = xen_memory_setup; + x86_init.oem.arch_setup = xen_arch_setup; + x86_init.oem.banner = xen_banner; -#ifdef CONFIG_SMP - smp_ops = xen_smp_ops; + xen_init_time_ops(); + + /* + * Set up some pagetable state before starting to set any ptes. + */ + + xen_init_mmu_ops(); + + /* Prevent unwanted bits from being set in PTEs. */ + __supported_pte_mask &= ~_PAGE_GLOBAL; +#if 0 + if (!xen_initial_domain()) #endif + __supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD); - xen_setup_features(); + __supported_pte_mask |= _PAGE_IOMAP; + + /* + * Prevent page tables from being allocated in highmem, even + * if CONFIG_HIGHPTE is enabled. + */ + __userpte_alloc_gfp &= ~__GFP_HIGHMEM; + + /* Work out if we support NX */ + x86_configure_nx(); /* Get mfn list */ - if (!xen_feature(XENFEAT_auto_translated_physmap)) - phys_to_machine_mapping = (unsigned long *)xen_start_info->mfn_list; + xen_build_dynamic_phys_to_machine(); - pgd = (pgd_t *)xen_start_info->pt_base; + /* + * Set up kernel GDT and segment registers, mainly so that + * -fstack-protector code can be executed. + */ + xen_setup_gdt(0); - init_pg_tables_end = __pa(pgd) + xen_start_info->nr_pt_frames*PAGE_SIZE; + xen_init_irq_ops(); + xen_init_cpuid_mask(); - init_mm.pgd = pgd; /* use the Xen pagetables to start */ +#ifdef CONFIG_X86_LOCAL_APIC + /* + * set up the basic apic ops. + */ + set_xen_basic_apic_ops(); +#endif - /* keep using Xen gdt for now; no urgent need to change it */ + if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) { + pv_mmu_ops.ptep_modify_prot_start = xen_ptep_modify_prot_start; + pv_mmu_ops.ptep_modify_prot_commit = xen_ptep_modify_prot_commit; + } - x86_write_percpu(xen_cr3, __pa(pgd)); - x86_write_percpu(xen_current_cr3, __pa(pgd)); + machine_ops = xen_machine_ops; + /* + * The only reliable way to retain the initial address of the + * percpu gdt_page is to remember it here, so we can go and + * mark it RW later, when the initial percpu area is freed. + */ + xen_initial_gdt = &per_cpu(gdt_page, 0); + + xen_smp_init(); + +#ifdef CONFIG_ACPI_NUMA + /* + * The pages we from Xen are not related to machine pages, so + * any NUMA information the kernel tries to get from ACPI will + * be meaningless. Prevent it from trying. + */ + acpi_numa = -1; +#endif +#ifdef CONFIG_X86_PAT + /* + * For right now disable the PAT. We should remove this once + * git commit 8eaffa67b43e99ae581622c5133e20b0f48bcef1 + * (xen/pat: Disable PAT support for now) is reverted. + */ + pat_enabled = 0; +#endif /* Don't do the full vcpu_info placement stuff until we have a possible map and a non-dummy shared_info. */ per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; + local_irq_disable(); + early_boot_irqs_disabled = true; + + xen_raw_console_write("mapping kernel into physical memory\n"); + xen_setup_kernel_pagetable((pgd_t *)xen_start_info->pt_base, xen_start_info->nr_pages); + + /* Allocate and initialize top and mid mfn levels for p2m structure */ + xen_build_mfn_list_list(); + + /* keep using Xen gdt for now; no urgent need to change it */ + +#ifdef CONFIG_X86_32 pv_info.kernel_rpl = 1; if (xen_feature(XENFEAT_supervisor_mode_kernel)) pv_info.kernel_rpl = 0; - +#else + pv_info.kernel_rpl = 0; +#endif /* set the limit of our address space */ xen_reserve_top(); + /* PVH: runs at default kernel iopl of 0 */ + if (!xen_pvh_domain()) { + /* + * We used to do this in xen_arch_setup, but that is too late + * on AMD were early_cpu_init (run before ->arch_setup()) calls + * early_amd_init which pokes 0xcf8 port. + */ + set_iopl.iopl = 1; + rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl); + if (rc != 0) + xen_raw_printk("physdev_op failed %d\n", rc); + } + +#ifdef CONFIG_X86_32 /* set up basic CPUID stuff */ cpu_detect(&new_cpu_data); - new_cpu_data.hard_math = 1; + set_cpu_cap(&new_cpu_data, X86_FEATURE_FPU); + new_cpu_data.wp_works_ok = 1; new_cpu_data.x86_capability[0] = cpuid_edx(1); +#endif /* Poke various useful things into boot_params */ boot_params.hdr.type_of_loader = (9 << 4) | 0; boot_params.hdr.ramdisk_image = xen_start_info->mod_start ? __pa(xen_start_info->mod_start) : 0; boot_params.hdr.ramdisk_size = xen_start_info->mod_len; + boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line); + + if (!xen_initial_domain()) { + add_preferred_console("xenboot", 0, NULL); + add_preferred_console("tty", 0, NULL); + add_preferred_console("hvc", 0, NULL); + if (pci_xen) + x86_init.pci.arch_init = pci_xen_init; + } else { + const struct dom0_vga_console_info *info = + (void *)((char *)xen_start_info + + xen_start_info->console.dom0.info_off); + struct xen_platform_op op = { + .cmd = XENPF_firmware_info, + .interface_version = XENPF_INTERFACE_VERSION, + .u.firmware_info.type = XEN_FW_KBD_SHIFT_FLAGS, + }; + + xen_init_vga(info, xen_start_info->console.dom0.info_size); + xen_start_info->console.domU.mfn = 0; + xen_start_info->console.domU.evtchn = 0; + + if (HYPERVISOR_dom0_op(&op) == 0) + boot_params.kbd_status = op.u.firmware_info.u.kbd_shift_flags; + + xen_init_apic(); + + /* Make sure ACS will be enabled */ + pci_request_acs(); + + xen_acpi_sleep_register(); + + /* Avoid searching for BIOS MP tables */ + x86_init.mpparse.find_smp_config = x86_init_noop; + x86_init.mpparse.get_smp_config = x86_init_uint_noop; + + xen_boot_params_init_edd(); + } +#ifdef CONFIG_PCI + /* PCI BIOS service won't work from a PV guest. */ + pci_probe &= ~PCI_PROBE_BIOS; +#endif + xen_raw_console_write("about to get started...\n"); + + xen_setup_runstate_info(0); /* Start the world */ - start_kernel(); +#ifdef CONFIG_X86_32 + i386_start_kernel(); +#else + x86_64_start_reservations((char *)__pa_symbol(&boot_params)); +#endif +} + +void __ref xen_hvm_init_shared_info(void) +{ + int cpu; + struct xen_add_to_physmap xatp; + static struct shared_info *shared_info_page = 0; + + if (!shared_info_page) + shared_info_page = (struct shared_info *) + extend_brk(PAGE_SIZE, PAGE_SIZE); + xatp.domid = DOMID_SELF; + xatp.idx = 0; + xatp.space = XENMAPSPACE_shared_info; + xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT; + if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) + BUG(); + + HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; + + /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info + * page, we use it in the event channel upcall and in some pvclock + * related functions. We don't need the vcpu_info placement + * optimizations because we don't use any pv_mmu or pv_irq op on + * HVM. + * When xen_hvm_init_shared_info is run at boot time only vcpu 0 is + * online but xen_hvm_init_shared_info is run at resume time too and + * in that case multiple vcpus might be online. */ + for_each_online_cpu(cpu) { + /* Leave it to be NULL. */ + if (cpu >= MAX_VIRT_CPUS) + continue; + per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; + } +} + +#ifdef CONFIG_XEN_PVHVM +static void __init init_hvm_pv_info(void) +{ + int major, minor; + uint32_t eax, ebx, ecx, edx, pages, msr, base; + u64 pfn; + + base = xen_cpuid_base(); + cpuid(base + 1, &eax, &ebx, &ecx, &edx); + + major = eax >> 16; + minor = eax & 0xffff; + printk(KERN_INFO "Xen version %d.%d.\n", major, minor); + + cpuid(base + 2, &pages, &msr, &ecx, &edx); + + pfn = __pa(hypercall_page); + wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32)); + + xen_setup_features(); + + pv_info.name = "Xen HVM"; + + xen_domain_type = XEN_HVM_DOMAIN; } + +static int xen_hvm_cpu_notify(struct notifier_block *self, unsigned long action, + void *hcpu) +{ + int cpu = (long)hcpu; + switch (action) { + case CPU_UP_PREPARE: + xen_vcpu_setup(cpu); + if (xen_have_vector_callback) { + if (xen_feature(XENFEAT_hvm_safe_pvclock)) + xen_setup_timer(cpu); + } + break; + default: + break; + } + return NOTIFY_OK; +} + +static struct notifier_block xen_hvm_cpu_notifier = { + .notifier_call = xen_hvm_cpu_notify, +}; + +static void __init xen_hvm_guest_init(void) +{ + init_hvm_pv_info(); + + xen_hvm_init_shared_info(); + + xen_panic_handler_init(); + + if (xen_feature(XENFEAT_hvm_callback_vector)) + xen_have_vector_callback = 1; + xen_hvm_smp_init(); + register_cpu_notifier(&xen_hvm_cpu_notifier); + xen_unplug_emulated_devices(); + x86_init.irqs.intr_init = xen_init_IRQ; + xen_hvm_init_time_ops(); + xen_hvm_init_mmu_ops(); +} + +static uint32_t __init xen_hvm_platform(void) +{ + if (xen_pv_domain()) + return 0; + + return xen_cpuid_base(); +} + +bool xen_hvm_need_lapic(void) +{ + if (xen_pv_domain()) + return false; + if (!xen_hvm_domain()) + return false; + if (xen_feature(XENFEAT_hvm_pirqs) && xen_have_vector_callback) + return false; + return true; +} +EXPORT_SYMBOL_GPL(xen_hvm_need_lapic); + +const struct hypervisor_x86 x86_hyper_xen_hvm __refconst = { + .name = "Xen HVM", + .detect = xen_hvm_platform, + .init_platform = xen_hvm_guest_init, + .x2apic_available = xen_x2apic_para_available, +}; +EXPORT_SYMBOL(x86_hyper_xen_hvm); +#endif |