1952 строки
48 KiB
C
1952 строки
48 KiB
C
/*
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* Core of Xen paravirt_ops implementation.
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*
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* This file contains the xen_paravirt_ops structure itself, and the
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* implementations for:
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* - privileged instructions
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* - interrupt flags
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* - segment operations
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* - booting and setup
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*
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* Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
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*/
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#include <linux/cpu.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/preempt.h>
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#include <linux/hardirq.h>
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#include <linux/percpu.h>
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#include <linux/delay.h>
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#include <linux/start_kernel.h>
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#include <linux/sched.h>
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#include <linux/kprobes.h>
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#include <linux/bootmem.h>
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <linux/page-flags.h>
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#include <linux/highmem.h>
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#include <linux/console.h>
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#include <linux/pci.h>
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#include <linux/gfp.h>
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#include <linux/memblock.h>
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#include <linux/edd.h>
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#include <linux/frame.h>
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#include <linux/kexec.h>
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#include <xen/xen.h>
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#include <xen/events.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/version.h>
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#include <xen/interface/physdev.h>
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#include <xen/interface/vcpu.h>
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#include <xen/interface/memory.h>
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#include <xen/interface/nmi.h>
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#include <xen/interface/xen-mca.h>
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#include <xen/features.h>
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#include <xen/page.h>
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#include <xen/hvm.h>
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#include <xen/hvc-console.h>
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#include <xen/acpi.h>
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#include <asm/paravirt.h>
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#include <asm/apic.h>
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#include <asm/page.h>
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#include <asm/xen/pci.h>
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#include <asm/xen/hypercall.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/xen/cpuid.h>
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#include <asm/fixmap.h>
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#include <asm/processor.h>
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#include <asm/proto.h>
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#include <asm/msr-index.h>
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#include <asm/traps.h>
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#include <asm/setup.h>
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#include <asm/desc.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include <asm/reboot.h>
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#include <asm/stackprotector.h>
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#include <asm/hypervisor.h>
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#include <asm/mach_traps.h>
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#include <asm/mwait.h>
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#include <asm/pci_x86.h>
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#include <asm/cpu.h>
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#ifdef CONFIG_ACPI
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#include <linux/acpi.h>
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#include <asm/acpi.h>
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#include <acpi/pdc_intel.h>
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#include <acpi/processor.h>
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#include <xen/interface/platform.h>
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#endif
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#include "xen-ops.h"
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#include "mmu.h"
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#include "smp.h"
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#include "multicalls.h"
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#include "pmu.h"
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EXPORT_SYMBOL_GPL(hypercall_page);
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/*
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* Pointer to the xen_vcpu_info structure or
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* &HYPERVISOR_shared_info->vcpu_info[cpu]. See xen_hvm_init_shared_info
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* and xen_vcpu_setup for details. By default it points to share_info->vcpu_info
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* but if the hypervisor supports VCPUOP_register_vcpu_info then it can point
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* to xen_vcpu_info. The pointer is used in __xen_evtchn_do_upcall to
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* acknowledge pending events.
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* Also more subtly it is used by the patched version of irq enable/disable
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* e.g. xen_irq_enable_direct and xen_iret in PV mode.
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*
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* The desire to be able to do those mask/unmask operations as a single
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* instruction by using the per-cpu offset held in %gs is the real reason
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* vcpu info is in a per-cpu pointer and the original reason for this
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* hypercall.
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*
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*/
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DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
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/*
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* Per CPU pages used if hypervisor supports VCPUOP_register_vcpu_info
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* hypercall. This can be used both in PV and PVHVM mode. The structure
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* overrides the default per_cpu(xen_vcpu, cpu) value.
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*/
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DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info);
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/* Linux <-> Xen vCPU id mapping */
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DEFINE_PER_CPU(int, xen_vcpu_id) = -1;
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EXPORT_PER_CPU_SYMBOL(xen_vcpu_id);
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enum xen_domain_type xen_domain_type = XEN_NATIVE;
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EXPORT_SYMBOL_GPL(xen_domain_type);
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unsigned long *machine_to_phys_mapping = (void *)MACH2PHYS_VIRT_START;
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EXPORT_SYMBOL(machine_to_phys_mapping);
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unsigned long machine_to_phys_nr;
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EXPORT_SYMBOL(machine_to_phys_nr);
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struct start_info *xen_start_info;
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EXPORT_SYMBOL_GPL(xen_start_info);
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struct shared_info xen_dummy_shared_info;
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void *xen_initial_gdt;
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RESERVE_BRK(shared_info_page_brk, PAGE_SIZE);
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__read_mostly int xen_have_vector_callback;
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EXPORT_SYMBOL_GPL(xen_have_vector_callback);
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/*
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* Point at some empty memory to start with. We map the real shared_info
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* page as soon as fixmap is up and running.
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*/
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struct shared_info *HYPERVISOR_shared_info = &xen_dummy_shared_info;
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/*
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* Flag to determine whether vcpu info placement is available on all
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* VCPUs. We assume it is to start with, and then set it to zero on
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* the first failure. This is because it can succeed on some VCPUs
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* and not others, since it can involve hypervisor memory allocation,
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* or because the guest failed to guarantee all the appropriate
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* constraints on all VCPUs (ie buffer can't cross a page boundary).
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*
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* Note that any particular CPU may be using a placed vcpu structure,
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* but we can only optimise if the all are.
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*
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* 0: not available, 1: available
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*/
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static int have_vcpu_info_placement = 1;
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struct tls_descs {
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struct desc_struct desc[3];
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};
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/*
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* Updating the 3 TLS descriptors in the GDT on every task switch is
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* surprisingly expensive so we avoid updating them if they haven't
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* changed. Since Xen writes different descriptors than the one
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* passed in the update_descriptor hypercall we keep shadow copies to
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* compare against.
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*/
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static DEFINE_PER_CPU(struct tls_descs, shadow_tls_desc);
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static void clamp_max_cpus(void)
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{
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#ifdef CONFIG_SMP
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if (setup_max_cpus > MAX_VIRT_CPUS)
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setup_max_cpus = MAX_VIRT_CPUS;
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#endif
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}
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void xen_vcpu_setup(int cpu)
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{
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struct vcpu_register_vcpu_info info;
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int err;
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struct vcpu_info *vcpup;
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BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
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/*
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* This path is called twice on PVHVM - first during bootup via
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* smp_init -> xen_hvm_cpu_notify, and then if the VCPU is being
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* hotplugged: cpu_up -> xen_hvm_cpu_notify.
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* As we can only do the VCPUOP_register_vcpu_info once lets
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* not over-write its result.
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*
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* For PV it is called during restore (xen_vcpu_restore) and bootup
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* (xen_setup_vcpu_info_placement). The hotplug mechanism does not
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* use this function.
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*/
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if (xen_hvm_domain()) {
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if (per_cpu(xen_vcpu, cpu) == &per_cpu(xen_vcpu_info, cpu))
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return;
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}
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if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS)
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per_cpu(xen_vcpu, cpu) =
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&HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)];
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if (!have_vcpu_info_placement) {
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if (cpu >= MAX_VIRT_CPUS)
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clamp_max_cpus();
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return;
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}
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vcpup = &per_cpu(xen_vcpu_info, cpu);
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info.mfn = arbitrary_virt_to_mfn(vcpup);
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info.offset = offset_in_page(vcpup);
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/* Check to see if the hypervisor will put the vcpu_info
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structure where we want it, which allows direct access via
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a percpu-variable.
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N.B. This hypercall can _only_ be called once per CPU. Subsequent
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calls will error out with -EINVAL. This is due to the fact that
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hypervisor has no unregister variant and this hypercall does not
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allow to over-write info.mfn and info.offset.
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*/
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err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu),
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&info);
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if (err) {
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printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err);
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have_vcpu_info_placement = 0;
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clamp_max_cpus();
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} else {
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/* This cpu is using the registered vcpu info, even if
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later ones fail to. */
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per_cpu(xen_vcpu, cpu) = vcpup;
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}
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}
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/*
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* On restore, set the vcpu placement up again.
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* If it fails, then we're in a bad state, since
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* we can't back out from using it...
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*/
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void xen_vcpu_restore(void)
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{
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int cpu;
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for_each_possible_cpu(cpu) {
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bool other_cpu = (cpu != smp_processor_id());
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bool is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up, xen_vcpu_nr(cpu),
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NULL);
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if (other_cpu && is_up &&
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HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL))
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BUG();
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xen_setup_runstate_info(cpu);
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if (have_vcpu_info_placement)
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xen_vcpu_setup(cpu);
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if (other_cpu && is_up &&
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HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL))
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BUG();
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}
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}
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static void __init xen_banner(void)
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{
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unsigned version = HYPERVISOR_xen_version(XENVER_version, NULL);
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struct xen_extraversion extra;
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HYPERVISOR_xen_version(XENVER_extraversion, &extra);
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pr_info("Booting paravirtualized kernel %son %s\n",
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xen_feature(XENFEAT_auto_translated_physmap) ?
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"with PVH extensions " : "", pv_info.name);
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printk(KERN_INFO "Xen version: %d.%d%s%s\n",
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version >> 16, version & 0xffff, extra.extraversion,
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xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
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}
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/* Check if running on Xen version (major, minor) or later */
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bool
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xen_running_on_version_or_later(unsigned int major, unsigned int minor)
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{
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unsigned int version;
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if (!xen_domain())
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return false;
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version = HYPERVISOR_xen_version(XENVER_version, NULL);
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if ((((version >> 16) == major) && ((version & 0xffff) >= minor)) ||
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((version >> 16) > major))
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return true;
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return false;
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}
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#define CPUID_THERM_POWER_LEAF 6
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#define APERFMPERF_PRESENT 0
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static __read_mostly unsigned int cpuid_leaf1_edx_mask = ~0;
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static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0;
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static __read_mostly unsigned int cpuid_leaf1_ecx_set_mask;
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static __read_mostly unsigned int cpuid_leaf5_ecx_val;
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static __read_mostly unsigned int cpuid_leaf5_edx_val;
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static void xen_cpuid(unsigned int *ax, unsigned int *bx,
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unsigned int *cx, unsigned int *dx)
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{
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unsigned maskebx = ~0;
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unsigned maskecx = ~0;
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unsigned maskedx = ~0;
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unsigned setecx = 0;
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/*
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* Mask out inconvenient features, to try and disable as many
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* unsupported kernel subsystems as possible.
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*/
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switch (*ax) {
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case 1:
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maskecx = cpuid_leaf1_ecx_mask;
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setecx = cpuid_leaf1_ecx_set_mask;
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maskedx = cpuid_leaf1_edx_mask;
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break;
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case CPUID_MWAIT_LEAF:
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/* Synthesize the values.. */
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*ax = 0;
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*bx = 0;
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*cx = cpuid_leaf5_ecx_val;
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*dx = cpuid_leaf5_edx_val;
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return;
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case CPUID_THERM_POWER_LEAF:
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/* Disabling APERFMPERF for kernel usage */
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maskecx = ~(1 << APERFMPERF_PRESENT);
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break;
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case 0xb:
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/* Suppress extended topology stuff */
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maskebx = 0;
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break;
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}
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asm(XEN_EMULATE_PREFIX "cpuid"
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: "=a" (*ax),
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"=b" (*bx),
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"=c" (*cx),
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"=d" (*dx)
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: "0" (*ax), "2" (*cx));
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*bx &= maskebx;
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*cx &= maskecx;
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*cx |= setecx;
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*dx &= maskedx;
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}
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STACK_FRAME_NON_STANDARD(xen_cpuid); /* XEN_EMULATE_PREFIX */
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static bool __init xen_check_mwait(void)
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{
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#ifdef CONFIG_ACPI
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struct xen_platform_op op = {
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.cmd = XENPF_set_processor_pminfo,
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.u.set_pminfo.id = -1,
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.u.set_pminfo.type = XEN_PM_PDC,
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};
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uint32_t buf[3];
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unsigned int ax, bx, cx, dx;
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unsigned int mwait_mask;
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/* We need to determine whether it is OK to expose the MWAIT
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* capability to the kernel to harvest deeper than C3 states from ACPI
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* _CST using the processor_harvest_xen.c module. For this to work, we
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* need to gather the MWAIT_LEAF values (which the cstate.c code
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* checks against). The hypervisor won't expose the MWAIT flag because
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* it would break backwards compatibility; so we will find out directly
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* from the hardware and hypercall.
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*/
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if (!xen_initial_domain())
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return false;
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/*
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* When running under platform earlier than Xen4.2, do not expose
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* mwait, to avoid the risk of loading native acpi pad driver
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*/
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if (!xen_running_on_version_or_later(4, 2))
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return false;
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ax = 1;
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cx = 0;
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native_cpuid(&ax, &bx, &cx, &dx);
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mwait_mask = (1 << (X86_FEATURE_EST % 32)) |
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(1 << (X86_FEATURE_MWAIT % 32));
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if ((cx & mwait_mask) != mwait_mask)
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return false;
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/* We need to emulate the MWAIT_LEAF and for that we need both
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* ecx and edx. The hypercall provides only partial information.
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*/
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ax = CPUID_MWAIT_LEAF;
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bx = 0;
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cx = 0;
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dx = 0;
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native_cpuid(&ax, &bx, &cx, &dx);
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/* Ask the Hypervisor whether to clear ACPI_PDC_C_C2C3_FFH. If so,
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* don't expose MWAIT_LEAF and let ACPI pick the IOPORT version of C3.
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*/
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buf[0] = ACPI_PDC_REVISION_ID;
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buf[1] = 1;
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buf[2] = (ACPI_PDC_C_CAPABILITY_SMP | ACPI_PDC_EST_CAPABILITY_SWSMP);
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set_xen_guest_handle(op.u.set_pminfo.pdc, buf);
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if ((HYPERVISOR_platform_op(&op) == 0) &&
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(buf[2] & (ACPI_PDC_C_C1_FFH | ACPI_PDC_C_C2C3_FFH))) {
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cpuid_leaf5_ecx_val = cx;
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cpuid_leaf5_edx_val = dx;
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}
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return true;
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#else
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return false;
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#endif
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}
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static void __init xen_init_cpuid_mask(void)
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{
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unsigned int ax, bx, cx, dx;
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unsigned int xsave_mask;
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cpuid_leaf1_edx_mask =
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~((1 << X86_FEATURE_MTRR) | /* disable MTRR */
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(1 << X86_FEATURE_ACC)); /* thermal monitoring */
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if (!xen_initial_domain())
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cpuid_leaf1_edx_mask &=
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~((1 << X86_FEATURE_ACPI)); /* disable ACPI */
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cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_X2APIC % 32));
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ax = 1;
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cx = 0;
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cpuid(1, &ax, &bx, &cx, &dx);
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xsave_mask =
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(1 << (X86_FEATURE_XSAVE % 32)) |
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(1 << (X86_FEATURE_OSXSAVE % 32));
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/* Xen will set CR4.OSXSAVE if supported and not disabled by force */
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if ((cx & xsave_mask) != xsave_mask)
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cpuid_leaf1_ecx_mask &= ~xsave_mask; /* disable XSAVE & OSXSAVE */
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if (xen_check_mwait())
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cpuid_leaf1_ecx_set_mask = (1 << (X86_FEATURE_MWAIT % 32));
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}
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static void xen_set_debugreg(int reg, unsigned long val)
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{
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HYPERVISOR_set_debugreg(reg, val);
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}
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static unsigned long xen_get_debugreg(int reg)
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{
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return HYPERVISOR_get_debugreg(reg);
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}
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static void xen_end_context_switch(struct task_struct *next)
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{
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xen_mc_flush();
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paravirt_end_context_switch(next);
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}
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static unsigned long xen_store_tr(void)
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{
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return 0;
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}
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/*
|
|
* 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;
|
|
unsigned char dummy;
|
|
|
|
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);
|
|
|
|
/*
|
|
* Careful: update_va_mapping() will fail if the virtual address
|
|
* we're poking isn't populated in the page tables. We don't
|
|
* need to worry about the direct map (that's always in the page
|
|
* tables), but we need to be careful about vmap space. In
|
|
* particular, the top level page table can lazily propagate
|
|
* entries between processes, so if we've switched mms since we
|
|
* vmapped the target in the first place, we might not have the
|
|
* top-level page table entry populated.
|
|
*
|
|
* We disable preemption because we want the same mm active when
|
|
* we probe the target and when we issue the hypercall. We'll
|
|
* have the same nominal mm, but if we're a kernel thread, lazy
|
|
* mm dropping could change our pgd.
|
|
*
|
|
* Out of an abundance of caution, this uses __get_user() to fault
|
|
* in the target address just in case there's some obscure case
|
|
* in which the target address isn't readable.
|
|
*/
|
|
|
|
preempt_disable();
|
|
|
|
probe_kernel_read(&dummy, v, 1);
|
|
|
|
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();
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries)
|
|
{
|
|
const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
|
|
int i;
|
|
|
|
/*
|
|
* We need to mark the all aliases of the LDT pages RO. We
|
|
* don't need to call vm_flush_aliases(), though, since that's
|
|
* only responsible for flushing aliases out the TLBs, not the
|
|
* page tables, and Xen will flush the TLB for us if needed.
|
|
*
|
|
* To avoid confusing future readers: none of this is necessary
|
|
* to load the LDT. The hypervisor only checks this when the
|
|
* LDT is faulted in due to subsequent descriptor access.
|
|
*/
|
|
|
|
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;
|
|
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 desc_ptr *dtr)
|
|
{
|
|
unsigned long va = dtr->address;
|
|
unsigned int size = dtr->size + 1;
|
|
unsigned pages = DIV_ROUND_UP(size, 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++) {
|
|
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);
|
|
}
|
|
|
|
if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
|
|
BUG();
|
|
}
|
|
|
|
/*
|
|
* 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 = DIV_ROUND_UP(size, 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 *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);
|
|
load_TLS_descriptor(t, cpu, 1);
|
|
load_TLS_descriptor(t, cpu, 2);
|
|
|
|
xen_mc_issue(PARAVIRT_LAZY_CPU);
|
|
}
|
|
|
|
#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)
|
|
{
|
|
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();
|
|
if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry))
|
|
BUG();
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
static int cvt_gate_to_trap(int vector, const gate_desc *val,
|
|
struct trap_info *info)
|
|
{
|
|
unsigned long addr;
|
|
|
|
if (val->type != GATE_TRAP && val->type != GATE_INTERRUPT)
|
|
return 0;
|
|
|
|
info->vector = vector;
|
|
|
|
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 (val->type == GATE_INTERRUPT)
|
|
info->flags |= 1 << 2;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Locations of each CPU's IDT */
|
|
static DEFINE_PER_CPU(struct desc_ptr, 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(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 = __this_cpu_read(idt_desc.address);
|
|
end = start + __this_cpu_read(idt_desc.size) + 1;
|
|
|
|
xen_mc_flush();
|
|
|
|
native_write_idt_entry(dt, entrynum, g);
|
|
|
|
if (p >= start && (p + 8) <= end) {
|
|
struct trap_info info[2];
|
|
|
|
info[1].address = 0;
|
|
|
|
if (cvt_gate_to_trap(entrynum, g, &info[0]))
|
|
if (HYPERVISOR_set_trap_table(info))
|
|
BUG();
|
|
}
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
static void xen_convert_trap_info(const struct desc_ptr *desc,
|
|
struct trap_info *traps)
|
|
{
|
|
unsigned in, out, count;
|
|
|
|
count = (desc->size+1) / sizeof(gate_desc);
|
|
BUG_ON(count > 256);
|
|
|
|
for (in = out = 0; in < count; in++) {
|
|
gate_desc *entry = (gate_desc*)(desc->address) + in;
|
|
|
|
if (cvt_gate_to_trap(in, entry, &traps[out]))
|
|
out++;
|
|
}
|
|
traps[out].address = 0;
|
|
}
|
|
|
|
void xen_copy_trap_info(struct trap_info *traps)
|
|
{
|
|
const struct desc_ptr *desc = this_cpu_ptr(&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 desc_ptr *desc)
|
|
{
|
|
static DEFINE_SPINLOCK(lock);
|
|
static struct trap_info traps[257];
|
|
|
|
trace_xen_cpu_load_idt(desc);
|
|
|
|
spin_lock(&lock);
|
|
|
|
memcpy(this_cpu_ptr(&idt_desc), desc, sizeof(idt_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,
|
|
const void *desc, int type)
|
|
{
|
|
trace_xen_cpu_write_gdt_entry(dt, entry, desc, type);
|
|
|
|
preempt_disable();
|
|
|
|
switch (type) {
|
|
case DESC_LDT:
|
|
case DESC_TSS:
|
|
/* ignore */
|
|
break;
|
|
|
|
default: {
|
|
xmaddr_t maddr = arbitrary_virt_to_machine(&dt[entry]);
|
|
|
|
xen_mc_flush();
|
|
if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
|
|
BUG();
|
|
}
|
|
|
|
}
|
|
|
|
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 multicall_space mcs;
|
|
|
|
mcs = xen_mc_entry(0);
|
|
MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0);
|
|
xen_mc_issue(PARAVIRT_LAZY_CPU);
|
|
tss->x86_tss.sp0 = thread->sp0;
|
|
}
|
|
|
|
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)
|
|
{
|
|
}
|
|
|
|
static void xen_clts(void)
|
|
{
|
|
struct multicall_space mcs;
|
|
|
|
mcs = xen_mc_entry(0);
|
|
|
|
MULTI_fpu_taskswitch(mcs.mc, 0);
|
|
|
|
xen_mc_issue(PARAVIRT_LAZY_CPU);
|
|
}
|
|
|
|
static DEFINE_PER_CPU(unsigned long, xen_cr0_value);
|
|
|
|
static unsigned long xen_read_cr0(void)
|
|
{
|
|
unsigned long cr0 = this_cpu_read(xen_cr0_value);
|
|
|
|
if (unlikely(cr0 == 0)) {
|
|
cr0 = native_read_cr0();
|
|
this_cpu_write(xen_cr0_value, cr0);
|
|
}
|
|
|
|
return cr0;
|
|
}
|
|
|
|
static void xen_write_cr0(unsigned long cr0)
|
|
{
|
|
struct multicall_space mcs;
|
|
|
|
this_cpu_write(xen_cr0_value, cr0);
|
|
|
|
/* Only pay attention to cr0.TS; everything else is
|
|
ignored. */
|
|
mcs = xen_mc_entry(0);
|
|
|
|
MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0);
|
|
|
|
xen_mc_issue(PARAVIRT_LAZY_CPU);
|
|
}
|
|
|
|
static void xen_write_cr4(unsigned long cr4)
|
|
{
|
|
cr4 &= ~(X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PCE);
|
|
|
|
native_write_cr4(cr4);
|
|
}
|
|
#ifdef CONFIG_X86_64
|
|
static inline unsigned long xen_read_cr8(void)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void xen_write_cr8(unsigned long val)
|
|
{
|
|
BUG_ON(val);
|
|
}
|
|
#endif
|
|
|
|
static u64 xen_read_msr_safe(unsigned int msr, int *err)
|
|
{
|
|
u64 val;
|
|
|
|
if (pmu_msr_read(msr, &val, err))
|
|
return val;
|
|
|
|
val = native_read_msr_safe(msr, err);
|
|
switch (msr) {
|
|
case MSR_IA32_APICBASE:
|
|
#ifdef CONFIG_X86_X2APIC
|
|
if (!(cpuid_ecx(1) & (1 << (X86_FEATURE_X2APIC & 31))))
|
|
#endif
|
|
val &= ~X2APIC_ENABLE;
|
|
break;
|
|
}
|
|
return val;
|
|
}
|
|
|
|
static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
|
|
{
|
|
int ret;
|
|
|
|
ret = 0;
|
|
|
|
switch (msr) {
|
|
#ifdef CONFIG_X86_64
|
|
unsigned which;
|
|
u64 base;
|
|
|
|
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;
|
|
|
|
set:
|
|
base = ((u64)high << 32) | low;
|
|
if (HYPERVISOR_set_segment_base(which, base) != 0)
|
|
ret = -EIO;
|
|
break;
|
|
#endif
|
|
|
|
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;
|
|
|
|
default:
|
|
if (!pmu_msr_write(msr, low, high, &ret))
|
|
ret = native_write_msr_safe(msr, low, high);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static u64 xen_read_msr(unsigned int msr)
|
|
{
|
|
/*
|
|
* This will silently swallow a #GP from RDMSR. It may be worth
|
|
* changing that.
|
|
*/
|
|
int err;
|
|
|
|
return xen_read_msr_safe(msr, &err);
|
|
}
|
|
|
|
static void xen_write_msr(unsigned int msr, unsigned low, unsigned high)
|
|
{
|
|
/*
|
|
* This will silently swallow a #GP from WRMSR. It may be worth
|
|
* changing that.
|
|
*/
|
|
xen_write_msr_safe(msr, low, high);
|
|
}
|
|
|
|
void xen_setup_shared_info(void)
|
|
{
|
|
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
|
|
set_fixmap(FIX_PARAVIRT_BOOTMAP,
|
|
xen_start_info->shared_info);
|
|
|
|
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);
|
|
|
|
#ifndef CONFIG_SMP
|
|
/* In UP this is as good a place as any to set up shared info */
|
|
xen_setup_vcpu_info_placement();
|
|
#endif
|
|
|
|
xen_setup_mfn_list_list();
|
|
}
|
|
|
|
/* This is called once we have the cpu_possible_mask */
|
|
void xen_setup_vcpu_info_placement(void)
|
|
{
|
|
int cpu;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
/* Set up direct vCPU id mapping for PV guests. */
|
|
per_cpu(xen_vcpu_id, 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. 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;
|
|
}
|
|
}
|
|
|
|
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(op, x) \
|
|
case PARAVIRT_PATCH(op.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(pv_irq_ops, irq_enable);
|
|
SITE(pv_irq_ops, irq_disable);
|
|
SITE(pv_irq_ops, save_fl);
|
|
SITE(pv_irq_ops, 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 pv_info xen_info __initconst = {
|
|
.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 __initconst = {
|
|
.patch = xen_patch,
|
|
};
|
|
|
|
static const struct pv_cpu_ops xen_cpu_ops __initconst = {
|
|
.cpuid = xen_cpuid,
|
|
|
|
.set_debugreg = xen_set_debugreg,
|
|
.get_debugreg = xen_get_debugreg,
|
|
|
|
.clts = xen_clts,
|
|
|
|
.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 = xen_read_msr,
|
|
.write_msr = xen_write_msr,
|
|
|
|
.read_msr_safe = xen_read_msr_safe,
|
|
.write_msr_safe = xen_write_msr_safe,
|
|
|
|
.read_pmc = xen_read_pmc,
|
|
|
|
.iret = xen_iret,
|
|
#ifdef CONFIG_X86_64
|
|
.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_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_sp0 = xen_load_sp0,
|
|
|
|
.set_iopl_mask = xen_set_iopl_mask,
|
|
.io_delay = xen_io_delay,
|
|
|
|
/* Xen takes care of %gs when switching to usermode for us */
|
|
.swapgs = paravirt_nop,
|
|
|
|
.start_context_switch = paravirt_start_context_switch,
|
|
.end_context_switch = xen_end_context_switch,
|
|
};
|
|
|
|
static void xen_reboot(int reason)
|
|
{
|
|
struct sched_shutdown r = { .reason = reason };
|
|
int cpu;
|
|
|
|
for_each_online_cpu(cpu)
|
|
xen_pmu_finish(cpu);
|
|
|
|
if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
|
|
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_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 int
|
|
xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
if (!kexec_crash_loaded())
|
|
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_power_off,
|
|
.shutdown = xen_machine_halt,
|
|
.crash_shutdown = xen_crash_shutdown,
|
|
.emergency_restart = xen_emergency_restart,
|
|
};
|
|
|
|
static unsigned char xen_get_nmi_reason(void)
|
|
{
|
|
unsigned char reason = 0;
|
|
|
|
/* Construct a value which looks like it came from port 0x61. */
|
|
if (test_bit(_XEN_NMIREASON_io_error,
|
|
&HYPERVISOR_shared_info->arch.nmi_reason))
|
|
reason |= NMI_REASON_IOCHK;
|
|
if (test_bit(_XEN_NMIREASON_pci_serr,
|
|
&HYPERVISOR_shared_info->arch.nmi_reason))
|
|
reason |= NMI_REASON_SERR;
|
|
|
|
return reason;
|
|
}
|
|
|
|
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_platform_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_platform_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
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
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));
|
|
|
|
/*
|
|
* 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;
|
|
|
|
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;
|
|
}
|
|
|
|
#ifdef CONFIG_XEN_PVH
|
|
/*
|
|
* 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_cpu().
|
|
*/
|
|
if (boot_cpu_has(X86_FEATURE_PSE))
|
|
cr4_set_bits_and_update_boot(X86_CR4_PSE);
|
|
|
|
if (boot_cpu_has(X86_FEATURE_PGE))
|
|
cr4_set_bits_and_update_boot(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_early_cpu_init(0, false);
|
|
xen_pvh_set_cr_flags(0);
|
|
|
|
#ifdef CONFIG_X86_32
|
|
BUG(); /* PVH: Implement proper support. */
|
|
#endif
|
|
}
|
|
#endif /* CONFIG_XEN_PVH */
|
|
|
|
static void __init xen_dom0_set_legacy_features(void)
|
|
{
|
|
x86_platform.legacy.rtc = 1;
|
|
}
|
|
|
|
/* First C function to be called on Xen boot */
|
|
asmlinkage __visible void __init xen_start_kernel(void)
|
|
{
|
|
struct physdev_set_iopl set_iopl;
|
|
unsigned long initrd_start = 0;
|
|
int rc;
|
|
|
|
if (!xen_start_info)
|
|
return;
|
|
|
|
xen_domain_type = XEN_PV_DOMAIN;
|
|
|
|
xen_setup_features();
|
|
#ifdef CONFIG_XEN_PVH
|
|
xen_pvh_early_guest_init();
|
|
#endif
|
|
xen_setup_machphys_mapping();
|
|
|
|
/* Install Xen paravirt ops */
|
|
pv_info = xen_info;
|
|
pv_init_ops = xen_init_ops;
|
|
if (!xen_pvh_domain()) {
|
|
pv_cpu_ops = xen_cpu_ops;
|
|
|
|
x86_platform.get_nmi_reason = xen_get_nmi_reason;
|
|
}
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
/*
|
|
* 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 */
|
|
xen_build_dynamic_phys_to_machine();
|
|
|
|
/*
|
|
* Set up kernel GDT and segment registers, mainly so that
|
|
* -fstack-protector code can be executed.
|
|
*/
|
|
xen_setup_gdt(0);
|
|
|
|
xen_init_irq_ops();
|
|
xen_init_cpuid_mask();
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
/*
|
|
* set up the basic apic ops.
|
|
*/
|
|
xen_init_apic();
|
|
#endif
|
|
|
|
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;
|
|
}
|
|
|
|
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
|
|
/* 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);
|
|
xen_reserve_special_pages();
|
|
|
|
/* 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);
|
|
set_cpu_cap(&new_cpu_data, X86_FEATURE_FPU);
|
|
new_cpu_data.wp_works_ok = 1;
|
|
new_cpu_data.x86_capability[CPUID_1_EDX] = cpuid_edx(1);
|
|
#endif
|
|
|
|
if (xen_start_info->mod_start) {
|
|
if (xen_start_info->flags & SIF_MOD_START_PFN)
|
|
initrd_start = PFN_PHYS(xen_start_info->mod_start);
|
|
else
|
|
initrd_start = __pa(xen_start_info->mod_start);
|
|
}
|
|
|
|
/* Poke various useful things into boot_params */
|
|
boot_params.hdr.type_of_loader = (9 << 4) | 0;
|
|
boot_params.hdr.ramdisk_image = initrd_start;
|
|
boot_params.hdr.ramdisk_size = xen_start_info->mod_len;
|
|
boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line);
|
|
boot_params.hdr.hardware_subarch = X86_SUBARCH_XEN;
|
|
|
|
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,
|
|
};
|
|
|
|
x86_platform.set_legacy_features =
|
|
xen_dom0_set_legacy_features;
|
|
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_platform_op(&op) == 0)
|
|
boot_params.kbd_status = op.u.firmware_info.u.kbd_shift_flags;
|
|
|
|
/* 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");
|
|
|
|
/* Let's presume PV guests always boot on vCPU with id 0. */
|
|
per_cpu(xen_vcpu_id, 0) = 0;
|
|
|
|
xen_setup_runstate_info(0);
|
|
|
|
xen_efi_init();
|
|
|
|
/* Start the world */
|
|
#ifdef CONFIG_X86_32
|
|
i386_start_kernel();
|
|
#else
|
|
cr4_init_shadow(); /* 32b kernel does this in i386_start_kernel() */
|
|
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 (xen_vcpu_nr(cpu) >= MAX_VIRT_CPUS)
|
|
continue;
|
|
per_cpu(xen_vcpu, cpu) =
|
|
&HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(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();
|
|
|
|
cpuid(base + 4, &eax, &ebx, &ecx, &edx);
|
|
if (eax & XEN_HVM_CPUID_VCPU_ID_PRESENT)
|
|
this_cpu_write(xen_vcpu_id, ebx);
|
|
else
|
|
this_cpu_write(xen_vcpu_id, smp_processor_id());
|
|
|
|
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:
|
|
if (cpu_acpi_id(cpu) != U32_MAX)
|
|
per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);
|
|
else
|
|
per_cpu(xen_vcpu_id, cpu) = cpu;
|
|
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,
|
|
};
|
|
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
static void xen_hvm_shutdown(void)
|
|
{
|
|
native_machine_shutdown();
|
|
if (kexec_in_progress)
|
|
xen_reboot(SHUTDOWN_soft_reset);
|
|
}
|
|
|
|
static void xen_hvm_crash_shutdown(struct pt_regs *regs)
|
|
{
|
|
native_machine_crash_shutdown(regs);
|
|
xen_reboot(SHUTDOWN_soft_reset);
|
|
}
|
|
#endif
|
|
|
|
static void __init xen_hvm_guest_init(void)
|
|
{
|
|
if (xen_pv_domain())
|
|
return;
|
|
|
|
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();
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
machine_ops.shutdown = xen_hvm_shutdown;
|
|
machine_ops.crash_shutdown = xen_hvm_crash_shutdown;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
static bool xen_nopv = false;
|
|
static __init int xen_parse_nopv(char *arg)
|
|
{
|
|
xen_nopv = true;
|
|
return 0;
|
|
}
|
|
early_param("xen_nopv", xen_parse_nopv);
|
|
|
|
static uint32_t __init xen_platform(void)
|
|
{
|
|
if (xen_nopv)
|
|
return 0;
|
|
|
|
return xen_cpuid_base();
|
|
}
|
|
|
|
bool xen_hvm_need_lapic(void)
|
|
{
|
|
if (xen_nopv)
|
|
return false;
|
|
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);
|
|
|
|
static void xen_set_cpu_features(struct cpuinfo_x86 *c)
|
|
{
|
|
if (xen_pv_domain()) {
|
|
clear_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
|
|
set_cpu_cap(c, X86_FEATURE_XENPV);
|
|
}
|
|
}
|
|
|
|
const struct hypervisor_x86 x86_hyper_xen = {
|
|
.name = "Xen",
|
|
.detect = xen_platform,
|
|
#ifdef CONFIG_XEN_PVHVM
|
|
.init_platform = xen_hvm_guest_init,
|
|
#endif
|
|
.x2apic_available = xen_x2apic_para_available,
|
|
.set_cpu_features = xen_set_cpu_features,
|
|
};
|
|
EXPORT_SYMBOL(x86_hyper_xen);
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
void xen_arch_register_cpu(int num)
|
|
{
|
|
arch_register_cpu(num);
|
|
}
|
|
EXPORT_SYMBOL(xen_arch_register_cpu);
|
|
|
|
void xen_arch_unregister_cpu(int num)
|
|
{
|
|
arch_unregister_cpu(num);
|
|
}
|
|
EXPORT_SYMBOL(xen_arch_unregister_cpu);
|
|
#endif
|