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ecbf29cdb3
Impact: cleanup hypervisor.h had accumulated a lot of crud, including lots of spurious #includes. Clean it all up, and go around fixing up everything else accordingly. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
1718 lines
40 KiB
C
1718 lines
40 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/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/bootmem.h>
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#include <linux/module.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 <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/features.h>
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#include <xen/page.h>
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#include <xen/hvc-console.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/hypercall.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/fixmap.h>
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#include <asm/processor.h>
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#include <asm/msr-index.h>
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#include <asm/setup.h>
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#include <asm/desc.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 "xen-ops.h"
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#include "mmu.h"
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#include "multicalls.h"
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EXPORT_SYMBOL_GPL(hypercall_page);
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DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
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DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info);
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enum xen_domain_type xen_domain_type = XEN_NATIVE;
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EXPORT_SYMBOL_GPL(xen_domain_type);
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/*
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* Identity map, in addition to plain kernel map. This needs to be
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* large enough to allocate page table pages to allocate the rest.
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* Each page can map 2MB.
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*/
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static pte_t level1_ident_pgt[PTRS_PER_PTE * 4] __page_aligned_bss;
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#ifdef CONFIG_X86_64
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/* l3 pud for userspace vsyscall mapping */
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static pud_t level3_user_vsyscall[PTRS_PER_PUD] __page_aligned_bss;
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#endif /* CONFIG_X86_64 */
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/*
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* Note about cr3 (pagetable base) values:
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*
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* xen_cr3 contains the current logical cr3 value; it contains the
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* last set cr3. This may not be the current effective cr3, because
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* its update may be being lazily deferred. However, a vcpu looking
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* at its own cr3 can use this value knowing that it everything will
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* be self-consistent.
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*
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* xen_current_cr3 contains the actual vcpu cr3; it is set once the
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* hypercall to set the vcpu cr3 is complete (so it may be a little
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* out of date, but it will never be set early). If one vcpu is
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* looking at another vcpu's cr3 value, it should use this variable.
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*/
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DEFINE_PER_CPU(unsigned long, xen_cr3); /* cr3 stored as physaddr */
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DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */
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struct start_info *xen_start_info;
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EXPORT_SYMBOL_GPL(xen_start_info);
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struct shared_info xen_dummy_shared_info;
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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 = (void *)&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 =
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#ifdef CONFIG_X86_32
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1
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#else
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0
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#endif
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;
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static 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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per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
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if (!have_vcpu_info_placement)
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return; /* already tested, not available */
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vcpup = &per_cpu(xen_vcpu_info, cpu);
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info.mfn = virt_to_mfn(vcpup);
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info.offset = offset_in_page(vcpup);
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printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %llx, offset %d\n",
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cpu, vcpup, info.mfn, info.offset);
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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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err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &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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} 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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printk(KERN_DEBUG "cpu %d using vcpu_info at %p\n",
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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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if (have_vcpu_info_placement) {
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int cpu;
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for_each_online_cpu(cpu) {
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bool other_cpu = (cpu != smp_processor_id());
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if (other_cpu &&
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HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL))
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BUG();
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xen_vcpu_setup(cpu);
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if (other_cpu &&
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HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL))
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BUG();
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}
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BUG_ON(!have_vcpu_info_placement);
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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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printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
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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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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 maskedx = ~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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if (*ax == 1)
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maskedx = ~((1 << X86_FEATURE_APIC) | /* disable APIC */
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(1 << X86_FEATURE_ACPI) | /* disable ACPI */
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(1 << X86_FEATURE_MCE) | /* disable MCE */
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(1 << X86_FEATURE_MCA) | /* disable MCA */
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(1 << X86_FEATURE_ACC)); /* thermal monitoring */
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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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*dx &= maskedx;
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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_leave_lazy(void)
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{
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paravirt_leave_lazy(paravirt_get_lazy_mode());
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xen_mc_flush();
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}
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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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/*
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* Set the page permissions for a particular virtual address. If the
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* address is a vmalloc mapping (or other non-linear mapping), then
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* find the linear mapping of the page and also set its protections to
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* match.
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*/
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static void set_aliased_prot(void *v, pgprot_t prot)
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{
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int level;
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pte_t *ptep;
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pte_t pte;
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unsigned long pfn;
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struct page *page;
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ptep = lookup_address((unsigned long)v, &level);
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BUG_ON(ptep == NULL);
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pfn = pte_pfn(*ptep);
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page = pfn_to_page(pfn);
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pte = pfn_pte(pfn, prot);
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if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0))
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BUG();
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if (!PageHighMem(page)) {
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void *av = __va(PFN_PHYS(pfn));
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if (av != v)
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if (HYPERVISOR_update_va_mapping((unsigned long)av, pte, 0))
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BUG();
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} else
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kmap_flush_unused();
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}
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static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries)
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{
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const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
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int i;
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for(i = 0; i < entries; i += entries_per_page)
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set_aliased_prot(ldt + i, PAGE_KERNEL_RO);
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}
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static void xen_free_ldt(struct desc_struct *ldt, unsigned entries)
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{
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const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
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int i;
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for(i = 0; i < entries; i += entries_per_page)
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set_aliased_prot(ldt + i, PAGE_KERNEL);
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}
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static void xen_set_ldt(const void *addr, unsigned entries)
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{
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struct mmuext_op *op;
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struct multicall_space mcs = xen_mc_entry(sizeof(*op));
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op = mcs.args;
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op->cmd = MMUEXT_SET_LDT;
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op->arg1.linear_addr = (unsigned long)addr;
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op->arg2.nr_ents = entries;
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MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
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xen_mc_issue(PARAVIRT_LAZY_CPU);
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}
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static void xen_load_gdt(const struct desc_ptr *dtr)
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{
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unsigned long *frames;
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unsigned long va = dtr->address;
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unsigned int size = dtr->size + 1;
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unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
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int f;
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struct multicall_space mcs;
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/* A GDT can be up to 64k in size, which corresponds to 8192
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8-byte entries, or 16 4k pages.. */
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BUG_ON(size > 65536);
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BUG_ON(va & ~PAGE_MASK);
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mcs = xen_mc_entry(sizeof(*frames) * pages);
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frames = mcs.args;
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for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
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frames[f] = virt_to_mfn(va);
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make_lowmem_page_readonly((void *)va);
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}
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MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct));
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xen_mc_issue(PARAVIRT_LAZY_CPU);
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}
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static void load_TLS_descriptor(struct thread_struct *t,
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unsigned int cpu, unsigned int i)
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{
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struct desc_struct *gdt = get_cpu_gdt_table(cpu);
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xmaddr_t maddr = virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
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struct multicall_space mc = __xen_mc_entry(0);
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MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]);
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}
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static void xen_load_tls(struct thread_struct *t, unsigned int cpu)
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{
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/*
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* XXX sleazy hack: If we're being called in a lazy-cpu zone,
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* it means we're in a context switch, and %gs has just been
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* saved. This means we can zero it out to prevent faults on
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* exit from the hypervisor if the next process has no %gs.
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* Either way, it has been saved, and the new value will get
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* loaded properly. This will go away as soon as Xen has been
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* modified to not save/restore %gs for normal hypercalls.
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*
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* On x86_64, this hack is not used for %gs, because gs points
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* to KERNEL_GS_BASE (and uses it for PDA references), so we
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* must not zero %gs on x86_64
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*
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* For x86_64, we need to zero %fs, otherwise we may get an
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* exception between the new %fs descriptor being loaded and
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* %fs being effectively cleared at __switch_to().
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*/
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if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) {
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#ifdef CONFIG_X86_32
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loadsegment(gs, 0);
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#else
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loadsegment(fs, 0);
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#endif
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}
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xen_mc_batch();
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load_TLS_descriptor(t, cpu, 0);
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load_TLS_descriptor(t, cpu, 1);
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load_TLS_descriptor(t, cpu, 2);
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xen_mc_issue(PARAVIRT_LAZY_CPU);
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}
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#ifdef CONFIG_X86_64
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static void xen_load_gs_index(unsigned int idx)
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{
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if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, idx))
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BUG();
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}
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#endif
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static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
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const void *ptr)
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{
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xmaddr_t mach_lp = arbitrary_virt_to_machine(&dt[entrynum]);
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u64 entry = *(u64 *)ptr;
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preempt_disable();
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xen_mc_flush();
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if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry))
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BUG();
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preempt_enable();
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}
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static int cvt_gate_to_trap(int vector, const gate_desc *val,
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struct trap_info *info)
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{
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if (val->type != 0xf && val->type != 0xe)
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return 0;
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info->vector = vector;
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info->address = gate_offset(*val);
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info->cs = gate_segment(*val);
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info->flags = val->dpl;
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/* interrupt gates clear IF */
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if (val->type == 0xe)
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info->flags |= 4;
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return 1;
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}
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/* Locations of each CPU's IDT */
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static DEFINE_PER_CPU(struct desc_ptr, idt_desc);
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/* Set an IDT entry. If the entry is part of the current IDT, then
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also update Xen. */
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static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g)
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{
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unsigned long p = (unsigned long)&dt[entrynum];
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unsigned long start, end;
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preempt_disable();
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start = __get_cpu_var(idt_desc).address;
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end = start + __get_cpu_var(idt_desc).size + 1;
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xen_mc_flush();
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native_write_idt_entry(dt, entrynum, g);
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if (p >= start && (p + 8) <= end) {
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struct trap_info info[2];
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info[1].address = 0;
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if (cvt_gate_to_trap(entrynum, g, &info[0]))
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if (HYPERVISOR_set_trap_table(info))
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BUG();
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}
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preempt_enable();
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}
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static void xen_convert_trap_info(const struct desc_ptr *desc,
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struct trap_info *traps)
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{
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unsigned in, out, count;
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count = (desc->size+1) / sizeof(gate_desc);
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BUG_ON(count > 256);
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for (in = out = 0; in < count; in++) {
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gate_desc *entry = (gate_desc*)(desc->address) + in;
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if (cvt_gate_to_trap(in, entry, &traps[out]))
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out++;
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}
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traps[out].address = 0;
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}
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void xen_copy_trap_info(struct trap_info *traps)
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{
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const struct desc_ptr *desc = &__get_cpu_var(idt_desc);
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xen_convert_trap_info(desc, traps);
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}
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/* Load a new IDT into Xen. In principle this can be per-CPU, so we
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hold a spinlock to protect the static traps[] array (static because
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it avoids allocation, and saves stack space). */
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static void xen_load_idt(const struct desc_ptr *desc)
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{
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static DEFINE_SPINLOCK(lock);
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static struct trap_info traps[257];
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spin_lock(&lock);
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__get_cpu_var(idt_desc) = *desc;
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xen_convert_trap_info(desc, traps);
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|
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)
|
|
{
|
|
preempt_disable();
|
|
|
|
switch (type) {
|
|
case DESC_LDT:
|
|
case DESC_TSS:
|
|
/* ignore */
|
|
break;
|
|
|
|
default: {
|
|
xmaddr_t maddr = virt_to_machine(&dt[entry]);
|
|
|
|
xen_mc_flush();
|
|
if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
|
|
BUG();
|
|
}
|
|
|
|
}
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
static void xen_load_sp0(struct tss_struct *tss,
|
|
struct thread_struct *thread)
|
|
{
|
|
struct multicall_space mcs = xen_mc_entry(0);
|
|
MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0);
|
|
xen_mc_issue(PARAVIRT_LAZY_CPU);
|
|
}
|
|
|
|
static void xen_set_iopl_mask(unsigned mask)
|
|
{
|
|
struct physdev_set_iopl set_iopl;
|
|
|
|
/* Force the change at ring 0. */
|
|
set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3;
|
|
HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
|
|
}
|
|
|
|
static void xen_io_delay(void)
|
|
{
|
|
}
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
static u32 xen_apic_read(u32 reg)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void xen_apic_write(u32 reg, u32 val)
|
|
{
|
|
/* Warn to see if there's any stray references */
|
|
WARN_ON(1);
|
|
}
|
|
|
|
static u64 xen_apic_icr_read(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void xen_apic_icr_write(u32 low, u32 id)
|
|
{
|
|
/* Warn to see if there's any stray references */
|
|
WARN_ON(1);
|
|
}
|
|
|
|
static void xen_apic_wait_icr_idle(void)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static u32 xen_safe_apic_wait_icr_idle(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct apic_ops xen_basic_apic_ops = {
|
|
.read = xen_apic_read,
|
|
.write = xen_apic_write,
|
|
.icr_read = xen_apic_icr_read,
|
|
.icr_write = xen_apic_icr_write,
|
|
.wait_icr_idle = xen_apic_wait_icr_idle,
|
|
.safe_wait_icr_idle = xen_safe_apic_wait_icr_idle,
|
|
};
|
|
|
|
#endif
|
|
|
|
static void xen_flush_tlb(void)
|
|
{
|
|
struct mmuext_op *op;
|
|
struct multicall_space mcs;
|
|
|
|
preempt_disable();
|
|
|
|
mcs = xen_mc_entry(sizeof(*op));
|
|
|
|
op = mcs.args;
|
|
op->cmd = MMUEXT_TLB_FLUSH_LOCAL;
|
|
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
|
|
|
|
xen_mc_issue(PARAVIRT_LAZY_MMU);
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
static void xen_flush_tlb_single(unsigned long addr)
|
|
{
|
|
struct mmuext_op *op;
|
|
struct multicall_space mcs;
|
|
|
|
preempt_disable();
|
|
|
|
mcs = xen_mc_entry(sizeof(*op));
|
|
op = mcs.args;
|
|
op->cmd = MMUEXT_INVLPG_LOCAL;
|
|
op->arg1.linear_addr = addr & PAGE_MASK;
|
|
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
|
|
|
|
xen_mc_issue(PARAVIRT_LAZY_MMU);
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm,
|
|
unsigned long va)
|
|
{
|
|
struct {
|
|
struct mmuext_op op;
|
|
cpumask_t mask;
|
|
} *args;
|
|
cpumask_t cpumask = *cpus;
|
|
struct multicall_space mcs;
|
|
|
|
/*
|
|
* A couple of (to be removed) sanity checks:
|
|
*
|
|
* - current CPU must not be in mask
|
|
* - mask must exist :)
|
|
*/
|
|
BUG_ON(cpus_empty(cpumask));
|
|
BUG_ON(cpu_isset(smp_processor_id(), cpumask));
|
|
BUG_ON(!mm);
|
|
|
|
/* If a CPU which we ran on has gone down, OK. */
|
|
cpus_and(cpumask, cpumask, cpu_online_map);
|
|
if (cpus_empty(cpumask))
|
|
return;
|
|
|
|
mcs = xen_mc_entry(sizeof(*args));
|
|
args = mcs.args;
|
|
args->mask = cpumask;
|
|
args->op.arg2.vcpumask = &args->mask;
|
|
|
|
if (va == TLB_FLUSH_ALL) {
|
|
args->op.cmd = MMUEXT_TLB_FLUSH_MULTI;
|
|
} else {
|
|
args->op.cmd = MMUEXT_INVLPG_MULTI;
|
|
args->op.arg1.linear_addr = va;
|
|
}
|
|
|
|
MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF);
|
|
|
|
xen_mc_issue(PARAVIRT_LAZY_MMU);
|
|
}
|
|
|
|
static void xen_clts(void)
|
|
{
|
|
struct multicall_space mcs;
|
|
|
|
mcs = xen_mc_entry(0);
|
|
|
|
MULTI_fpu_taskswitch(mcs.mc, 0);
|
|
|
|
xen_mc_issue(PARAVIRT_LAZY_CPU);
|
|
}
|
|
|
|
static void xen_write_cr0(unsigned long cr0)
|
|
{
|
|
struct multicall_space mcs;
|
|
|
|
/* 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_cr2(unsigned long cr2)
|
|
{
|
|
x86_read_percpu(xen_vcpu)->arch.cr2 = cr2;
|
|
}
|
|
|
|
static unsigned long xen_read_cr2(void)
|
|
{
|
|
return x86_read_percpu(xen_vcpu)->arch.cr2;
|
|
}
|
|
|
|
static unsigned long xen_read_cr2_direct(void)
|
|
{
|
|
return x86_read_percpu(xen_vcpu_info.arch.cr2);
|
|
}
|
|
|
|
static void xen_write_cr4(unsigned long cr4)
|
|
{
|
|
cr4 &= ~X86_CR4_PGE;
|
|
cr4 &= ~X86_CR4_PSE;
|
|
|
|
native_write_cr4(cr4);
|
|
}
|
|
|
|
static unsigned long xen_read_cr3(void)
|
|
{
|
|
return x86_read_percpu(xen_cr3);
|
|
}
|
|
|
|
static void set_current_cr3(void *v)
|
|
{
|
|
x86_write_percpu(xen_current_cr3, (unsigned long)v);
|
|
}
|
|
|
|
static void __xen_write_cr3(bool kernel, unsigned long cr3)
|
|
{
|
|
struct mmuext_op *op;
|
|
struct multicall_space mcs;
|
|
unsigned long mfn;
|
|
|
|
if (cr3)
|
|
mfn = pfn_to_mfn(PFN_DOWN(cr3));
|
|
else
|
|
mfn = 0;
|
|
|
|
WARN_ON(mfn == 0 && kernel);
|
|
|
|
mcs = __xen_mc_entry(sizeof(*op));
|
|
|
|
op = mcs.args;
|
|
op->cmd = kernel ? MMUEXT_NEW_BASEPTR : MMUEXT_NEW_USER_BASEPTR;
|
|
op->arg1.mfn = mfn;
|
|
|
|
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
|
|
|
|
if (kernel) {
|
|
x86_write_percpu(xen_cr3, cr3);
|
|
|
|
/* Update xen_current_cr3 once the batch has actually
|
|
been submitted. */
|
|
xen_mc_callback(set_current_cr3, (void *)cr3);
|
|
}
|
|
}
|
|
|
|
static void xen_write_cr3(unsigned long cr3)
|
|
{
|
|
BUG_ON(preemptible());
|
|
|
|
xen_mc_batch(); /* disables interrupts */
|
|
|
|
/* Update while interrupts are disabled, so its atomic with
|
|
respect to ipis */
|
|
x86_write_percpu(xen_cr3, cr3);
|
|
|
|
__xen_write_cr3(true, cr3);
|
|
|
|
#ifdef CONFIG_X86_64
|
|
{
|
|
pgd_t *user_pgd = xen_get_user_pgd(__va(cr3));
|
|
if (user_pgd)
|
|
__xen_write_cr3(false, __pa(user_pgd));
|
|
else
|
|
__xen_write_cr3(false, 0);
|
|
}
|
|
#endif
|
|
|
|
xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */
|
|
}
|
|
|
|
static int xen_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 = -EFAULT;
|
|
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:
|
|
ret = native_write_msr_safe(msr, low, high);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Early in boot, while setting up the initial pagetable, assume
|
|
everything is pinned. */
|
|
static __init void xen_alloc_pte_init(struct mm_struct *mm, unsigned long pfn)
|
|
{
|
|
#ifdef CONFIG_FLATMEM
|
|
BUG_ON(mem_map); /* should only be used early */
|
|
#endif
|
|
make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
|
|
}
|
|
|
|
/* Early release_pte assumes that all pts are pinned, since there's
|
|
only init_mm and anything attached to that is pinned. */
|
|
static void xen_release_pte_init(unsigned long pfn)
|
|
{
|
|
make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
|
|
}
|
|
|
|
static void pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
|
|
{
|
|
struct mmuext_op op;
|
|
op.cmd = cmd;
|
|
op.arg1.mfn = pfn_to_mfn(pfn);
|
|
if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
|
|
BUG();
|
|
}
|
|
|
|
/* This needs to make sure the new pte page is pinned iff its being
|
|
attached to a pinned pagetable. */
|
|
static void xen_alloc_ptpage(struct mm_struct *mm, unsigned long pfn, unsigned level)
|
|
{
|
|
struct page *page = pfn_to_page(pfn);
|
|
|
|
if (PagePinned(virt_to_page(mm->pgd))) {
|
|
SetPagePinned(page);
|
|
|
|
vm_unmap_aliases();
|
|
if (!PageHighMem(page)) {
|
|
make_lowmem_page_readonly(__va(PFN_PHYS((unsigned long)pfn)));
|
|
if (level == PT_PTE && USE_SPLIT_PTLOCKS)
|
|
pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
|
|
} else {
|
|
/* make sure there are no stray mappings of
|
|
this page */
|
|
kmap_flush_unused();
|
|
}
|
|
}
|
|
}
|
|
|
|
static void xen_alloc_pte(struct mm_struct *mm, unsigned long pfn)
|
|
{
|
|
xen_alloc_ptpage(mm, pfn, PT_PTE);
|
|
}
|
|
|
|
static void xen_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
|
|
{
|
|
xen_alloc_ptpage(mm, pfn, PT_PMD);
|
|
}
|
|
|
|
static int xen_pgd_alloc(struct mm_struct *mm)
|
|
{
|
|
pgd_t *pgd = mm->pgd;
|
|
int ret = 0;
|
|
|
|
BUG_ON(PagePinned(virt_to_page(pgd)));
|
|
|
|
#ifdef CONFIG_X86_64
|
|
{
|
|
struct page *page = virt_to_page(pgd);
|
|
pgd_t *user_pgd;
|
|
|
|
BUG_ON(page->private != 0);
|
|
|
|
ret = -ENOMEM;
|
|
|
|
user_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
|
|
page->private = (unsigned long)user_pgd;
|
|
|
|
if (user_pgd != NULL) {
|
|
user_pgd[pgd_index(VSYSCALL_START)] =
|
|
__pgd(__pa(level3_user_vsyscall) | _PAGE_TABLE);
|
|
ret = 0;
|
|
}
|
|
|
|
BUG_ON(PagePinned(virt_to_page(xen_get_user_pgd(pgd))));
|
|
}
|
|
#endif
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void xen_pgd_free(struct mm_struct *mm, pgd_t *pgd)
|
|
{
|
|
#ifdef CONFIG_X86_64
|
|
pgd_t *user_pgd = xen_get_user_pgd(pgd);
|
|
|
|
if (user_pgd)
|
|
free_page((unsigned long)user_pgd);
|
|
#endif
|
|
}
|
|
|
|
/* This should never happen until we're OK to use struct page */
|
|
static void xen_release_ptpage(unsigned long pfn, unsigned level)
|
|
{
|
|
struct page *page = pfn_to_page(pfn);
|
|
|
|
if (PagePinned(page)) {
|
|
if (!PageHighMem(page)) {
|
|
if (level == PT_PTE && USE_SPLIT_PTLOCKS)
|
|
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
|
|
make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
|
|
}
|
|
ClearPagePinned(page);
|
|
}
|
|
}
|
|
|
|
static void xen_release_pte(unsigned long pfn)
|
|
{
|
|
xen_release_ptpage(pfn, PT_PTE);
|
|
}
|
|
|
|
static void xen_release_pmd(unsigned long pfn)
|
|
{
|
|
xen_release_ptpage(pfn, PT_PMD);
|
|
}
|
|
|
|
#if PAGETABLE_LEVELS == 4
|
|
static void xen_alloc_pud(struct mm_struct *mm, unsigned long pfn)
|
|
{
|
|
xen_alloc_ptpage(mm, pfn, PT_PUD);
|
|
}
|
|
|
|
static void xen_release_pud(unsigned long pfn)
|
|
{
|
|
xen_release_ptpage(pfn, PT_PUD);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_HIGHPTE
|
|
static void *xen_kmap_atomic_pte(struct page *page, enum km_type type)
|
|
{
|
|
pgprot_t prot = PAGE_KERNEL;
|
|
|
|
if (PagePinned(page))
|
|
prot = PAGE_KERNEL_RO;
|
|
|
|
if (0 && PageHighMem(page))
|
|
printk("mapping highpte %lx type %d prot %s\n",
|
|
page_to_pfn(page), type,
|
|
(unsigned long)pgprot_val(prot) & _PAGE_RW ? "WRITE" : "READ");
|
|
|
|
return kmap_atomic_prot(page, type, prot);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_32
|
|
static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte)
|
|
{
|
|
/* If there's an existing pte, then don't allow _PAGE_RW to be set */
|
|
if (pte_val_ma(*ptep) & _PAGE_PRESENT)
|
|
pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) &
|
|
pte_val_ma(pte));
|
|
|
|
return pte;
|
|
}
|
|
|
|
/* Init-time set_pte while constructing initial pagetables, which
|
|
doesn't allow RO pagetable pages to be remapped RW */
|
|
static __init void xen_set_pte_init(pte_t *ptep, pte_t pte)
|
|
{
|
|
pte = mask_rw_pte(ptep, pte);
|
|
|
|
xen_set_pte(ptep, pte);
|
|
}
|
|
#endif
|
|
|
|
static __init void xen_pagetable_setup_start(pgd_t *base)
|
|
{
|
|
}
|
|
|
|
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();
|
|
}
|
|
|
|
static __init void xen_pagetable_setup_done(pgd_t *base)
|
|
{
|
|
xen_setup_shared_info();
|
|
}
|
|
|
|
static __init void xen_post_allocator_init(void)
|
|
{
|
|
pv_mmu_ops.set_pte = xen_set_pte;
|
|
pv_mmu_ops.set_pmd = xen_set_pmd;
|
|
pv_mmu_ops.set_pud = xen_set_pud;
|
|
#if PAGETABLE_LEVELS == 4
|
|
pv_mmu_ops.set_pgd = xen_set_pgd;
|
|
#endif
|
|
|
|
/* This will work as long as patching hasn't happened yet
|
|
(which it hasn't) */
|
|
pv_mmu_ops.alloc_pte = xen_alloc_pte;
|
|
pv_mmu_ops.alloc_pmd = xen_alloc_pmd;
|
|
pv_mmu_ops.release_pte = xen_release_pte;
|
|
pv_mmu_ops.release_pmd = xen_release_pmd;
|
|
#if PAGETABLE_LEVELS == 4
|
|
pv_mmu_ops.alloc_pud = xen_alloc_pud;
|
|
pv_mmu_ops.release_pud = xen_release_pud;
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_64
|
|
SetPagePinned(virt_to_page(level3_user_vsyscall));
|
|
#endif
|
|
xen_mark_init_mm_pinned();
|
|
}
|
|
|
|
/* This is called once we have the cpu_possible_map */
|
|
void xen_setup_vcpu_info_placement(void)
|
|
{
|
|
int cpu;
|
|
|
|
for_each_possible_cpu(cpu)
|
|
xen_vcpu_setup(cpu);
|
|
|
|
/* xen_vcpu_setup managed to place the vcpu_info within the
|
|
percpu area for all cpus, so make use of it */
|
|
if (have_vcpu_info_placement) {
|
|
printk(KERN_INFO "Xen: using vcpu_info placement\n");
|
|
|
|
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;
|
|
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 void xen_set_fixmap(unsigned idx, unsigned long phys, pgprot_t prot)
|
|
{
|
|
pte_t pte;
|
|
|
|
phys >>= PAGE_SHIFT;
|
|
|
|
switch (idx) {
|
|
case FIX_BTMAP_END ... FIX_BTMAP_BEGIN:
|
|
#ifdef CONFIG_X86_F00F_BUG
|
|
case FIX_F00F_IDT:
|
|
#endif
|
|
#ifdef CONFIG_X86_32
|
|
case FIX_WP_TEST:
|
|
case FIX_VDSO:
|
|
# ifdef CONFIG_HIGHMEM
|
|
case FIX_KMAP_BEGIN ... FIX_KMAP_END:
|
|
# endif
|
|
#else
|
|
case VSYSCALL_LAST_PAGE ... VSYSCALL_FIRST_PAGE:
|
|
#endif
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
case FIX_APIC_BASE: /* maps dummy local APIC */
|
|
#endif
|
|
pte = pfn_pte(phys, prot);
|
|
break;
|
|
|
|
default:
|
|
pte = mfn_pte(phys, prot);
|
|
break;
|
|
}
|
|
|
|
__native_set_fixmap(idx, pte);
|
|
|
|
#ifdef CONFIG_X86_64
|
|
/* Replicate changes to map the vsyscall page into the user
|
|
pagetable vsyscall mapping. */
|
|
if (idx >= VSYSCALL_LAST_PAGE && idx <= VSYSCALL_FIRST_PAGE) {
|
|
unsigned long vaddr = __fix_to_virt(idx);
|
|
set_pte_vaddr_pud(level3_user_vsyscall, vaddr, pte);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static const struct pv_info xen_info __initdata = {
|
|
.paravirt_enabled = 1,
|
|
.shared_kernel_pmd = 0,
|
|
|
|
.name = "Xen",
|
|
};
|
|
|
|
static const struct pv_init_ops xen_init_ops __initdata = {
|
|
.patch = xen_patch,
|
|
|
|
.banner = xen_banner,
|
|
.memory_setup = xen_memory_setup,
|
|
.arch_setup = xen_arch_setup,
|
|
.post_allocator_init = xen_post_allocator_init,
|
|
};
|
|
|
|
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_tsc_khz = xen_tsc_khz,
|
|
.sched_clock = xen_sched_clock,
|
|
};
|
|
|
|
static const struct pv_cpu_ops xen_cpu_ops __initdata = {
|
|
.cpuid = xen_cpuid,
|
|
|
|
.set_debugreg = xen_set_debugreg,
|
|
.get_debugreg = xen_get_debugreg,
|
|
|
|
.clts = xen_clts,
|
|
|
|
.read_cr0 = native_read_cr0,
|
|
.write_cr0 = xen_write_cr0,
|
|
|
|
.read_cr4 = native_read_cr4,
|
|
.read_cr4_safe = native_read_cr4_safe,
|
|
.write_cr4 = xen_write_cr4,
|
|
|
|
.wbinvd = native_wbinvd,
|
|
|
|
.read_msr = native_read_msr_safe,
|
|
.write_msr = xen_write_msr_safe,
|
|
.read_tsc = native_read_tsc,
|
|
.read_pmc = native_read_pmc,
|
|
|
|
.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,
|
|
|
|
.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,
|
|
|
|
.lazy_mode = {
|
|
.enter = paravirt_enter_lazy_cpu,
|
|
.leave = xen_leave_lazy,
|
|
},
|
|
};
|
|
|
|
static const struct pv_apic_ops xen_apic_ops __initdata = {
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
.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,
|
|
|
|
.pgd_alloc = xen_pgd_alloc,
|
|
.pgd_free = xen_pgd_free,
|
|
|
|
.alloc_pte = xen_alloc_pte_init,
|
|
.release_pte = xen_release_pte_init,
|
|
.alloc_pmd = xen_alloc_pte_init,
|
|
.alloc_pmd_clone = paravirt_nop,
|
|
.release_pmd = xen_release_pte_init,
|
|
|
|
#ifdef CONFIG_HIGHPTE
|
|
.kmap_atomic_pte = xen_kmap_atomic_pte,
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_64
|
|
.set_pte = xen_set_pte,
|
|
#else
|
|
.set_pte = xen_set_pte_init,
|
|
#endif
|
|
.set_pte_at = xen_set_pte_at,
|
|
.set_pmd = xen_set_pmd_hyper,
|
|
|
|
.ptep_modify_prot_start = __ptep_modify_prot_start,
|
|
.ptep_modify_prot_commit = __ptep_modify_prot_commit,
|
|
|
|
.pte_val = xen_pte_val,
|
|
.pte_flags = native_pte_flags,
|
|
.pgd_val = xen_pgd_val,
|
|
|
|
.make_pte = xen_make_pte,
|
|
.make_pgd = xen_make_pgd,
|
|
|
|
#ifdef CONFIG_X86_PAE
|
|
.set_pte_atomic = xen_set_pte_atomic,
|
|
.set_pte_present = xen_set_pte_at,
|
|
.pte_clear = xen_pte_clear,
|
|
.pmd_clear = xen_pmd_clear,
|
|
#endif /* CONFIG_X86_PAE */
|
|
.set_pud = xen_set_pud_hyper,
|
|
|
|
.make_pmd = xen_make_pmd,
|
|
.pmd_val = xen_pmd_val,
|
|
|
|
#if PAGETABLE_LEVELS == 4
|
|
.pud_val = xen_pud_val,
|
|
.make_pud = xen_make_pud,
|
|
.set_pgd = xen_set_pgd_hyper,
|
|
|
|
.alloc_pud = xen_alloc_pte_init,
|
|
.release_pud = xen_release_pte_init,
|
|
#endif /* PAGETABLE_LEVELS == 4 */
|
|
|
|
.activate_mm = xen_activate_mm,
|
|
.dup_mmap = xen_dup_mmap,
|
|
.exit_mmap = xen_exit_mmap,
|
|
|
|
.lazy_mode = {
|
|
.enter = paravirt_enter_lazy_mmu,
|
|
.leave = xen_leave_lazy,
|
|
},
|
|
|
|
.set_fixmap = xen_set_fixmap,
|
|
};
|
|
|
|
static void xen_reboot(int reason)
|
|
{
|
|
struct sched_shutdown r = { .reason = reason };
|
|
|
|
#ifdef CONFIG_SMP
|
|
smp_send_stop();
|
|
#endif
|
|
|
|
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_crash_shutdown(struct pt_regs *regs)
|
|
{
|
|
xen_reboot(SHUTDOWN_crash);
|
|
}
|
|
|
|
static const struct machine_ops __initdata xen_machine_ops = {
|
|
.restart = xen_restart,
|
|
.halt = xen_machine_halt,
|
|
.power_off = xen_machine_halt,
|
|
.shutdown = xen_machine_halt,
|
|
.crash_shutdown = xen_crash_shutdown,
|
|
.emergency_restart = xen_emergency_restart,
|
|
};
|
|
|
|
|
|
static void __init xen_reserve_top(void)
|
|
{
|
|
#ifdef CONFIG_X86_32
|
|
unsigned long top = HYPERVISOR_VIRT_START;
|
|
struct xen_platform_parameters pp;
|
|
|
|
if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0)
|
|
top = pp.virt_start;
|
|
|
|
reserve_top_address(-top);
|
|
#endif /* CONFIG_X86_32 */
|
|
}
|
|
|
|
/*
|
|
* Like __va(), but returns address in the kernel mapping (which is
|
|
* all we have until the physical memory mapping has been set up.
|
|
*/
|
|
static void *__ka(phys_addr_t paddr)
|
|
{
|
|
#ifdef CONFIG_X86_64
|
|
return (void *)(paddr + __START_KERNEL_map);
|
|
#else
|
|
return __va(paddr);
|
|
#endif
|
|
}
|
|
|
|
/* Convert a machine address to physical address */
|
|
static unsigned long m2p(phys_addr_t maddr)
|
|
{
|
|
phys_addr_t paddr;
|
|
|
|
maddr &= PTE_PFN_MASK;
|
|
paddr = mfn_to_pfn(maddr >> PAGE_SHIFT) << PAGE_SHIFT;
|
|
|
|
return paddr;
|
|
}
|
|
|
|
/* Convert a machine address to kernel virtual */
|
|
static void *m2v(phys_addr_t maddr)
|
|
{
|
|
return __ka(m2p(maddr));
|
|
}
|
|
|
|
static void set_page_prot(void *addr, pgprot_t prot)
|
|
{
|
|
unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
|
|
pte_t pte = pfn_pte(pfn, prot);
|
|
|
|
if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, 0))
|
|
BUG();
|
|
}
|
|
|
|
static __init void xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
|
|
{
|
|
unsigned pmdidx, pteidx;
|
|
unsigned ident_pte;
|
|
unsigned long pfn;
|
|
|
|
ident_pte = 0;
|
|
pfn = 0;
|
|
for (pmdidx = 0; pmdidx < PTRS_PER_PMD && pfn < max_pfn; pmdidx++) {
|
|
pte_t *pte_page;
|
|
|
|
/* Reuse or allocate a page of ptes */
|
|
if (pmd_present(pmd[pmdidx]))
|
|
pte_page = m2v(pmd[pmdidx].pmd);
|
|
else {
|
|
/* Check for free pte pages */
|
|
if (ident_pte == ARRAY_SIZE(level1_ident_pgt))
|
|
break;
|
|
|
|
pte_page = &level1_ident_pgt[ident_pte];
|
|
ident_pte += PTRS_PER_PTE;
|
|
|
|
pmd[pmdidx] = __pmd(__pa(pte_page) | _PAGE_TABLE);
|
|
}
|
|
|
|
/* Install mappings */
|
|
for (pteidx = 0; pteidx < PTRS_PER_PTE; pteidx++, pfn++) {
|
|
pte_t pte;
|
|
|
|
if (pfn > max_pfn_mapped)
|
|
max_pfn_mapped = pfn;
|
|
|
|
if (!pte_none(pte_page[pteidx]))
|
|
continue;
|
|
|
|
pte = pfn_pte(pfn, PAGE_KERNEL_EXEC);
|
|
pte_page[pteidx] = pte;
|
|
}
|
|
}
|
|
|
|
for (pteidx = 0; pteidx < ident_pte; pteidx += PTRS_PER_PTE)
|
|
set_page_prot(&level1_ident_pgt[pteidx], PAGE_KERNEL_RO);
|
|
|
|
set_page_prot(pmd, PAGE_KERNEL_RO);
|
|
}
|
|
|
|
#ifdef CONFIG_X86_64
|
|
static void convert_pfn_mfn(void *v)
|
|
{
|
|
pte_t *pte = v;
|
|
int i;
|
|
|
|
/* All levels are converted the same way, so just treat them
|
|
as ptes. */
|
|
for (i = 0; i < PTRS_PER_PTE; i++)
|
|
pte[i] = xen_make_pte(pte[i].pte);
|
|
}
|
|
|
|
/*
|
|
* Set up the inital kernel pagetable.
|
|
*
|
|
* We can construct this by grafting the Xen provided pagetable into
|
|
* head_64.S's preconstructed pagetables. We copy the Xen L2's into
|
|
* level2_ident_pgt, level2_kernel_pgt and level2_fixmap_pgt. This
|
|
* means that only the kernel has a physical mapping to start with -
|
|
* but that's enough to get __va working. We need to fill in the rest
|
|
* of the physical mapping once some sort of allocator has been set
|
|
* up.
|
|
*/
|
|
static __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
|
|
unsigned long max_pfn)
|
|
{
|
|
pud_t *l3;
|
|
pmd_t *l2;
|
|
|
|
/* Zap identity mapping */
|
|
init_level4_pgt[0] = __pgd(0);
|
|
|
|
/* Pre-constructed entries are in pfn, so convert to mfn */
|
|
convert_pfn_mfn(init_level4_pgt);
|
|
convert_pfn_mfn(level3_ident_pgt);
|
|
convert_pfn_mfn(level3_kernel_pgt);
|
|
|
|
l3 = m2v(pgd[pgd_index(__START_KERNEL_map)].pgd);
|
|
l2 = m2v(l3[pud_index(__START_KERNEL_map)].pud);
|
|
|
|
memcpy(level2_ident_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
|
|
memcpy(level2_kernel_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
|
|
|
|
l3 = m2v(pgd[pgd_index(__START_KERNEL_map + PMD_SIZE)].pgd);
|
|
l2 = m2v(l3[pud_index(__START_KERNEL_map + PMD_SIZE)].pud);
|
|
memcpy(level2_fixmap_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
|
|
|
|
/* Set up identity map */
|
|
xen_map_identity_early(level2_ident_pgt, max_pfn);
|
|
|
|
/* Make pagetable pieces RO */
|
|
set_page_prot(init_level4_pgt, PAGE_KERNEL_RO);
|
|
set_page_prot(level3_ident_pgt, PAGE_KERNEL_RO);
|
|
set_page_prot(level3_kernel_pgt, PAGE_KERNEL_RO);
|
|
set_page_prot(level3_user_vsyscall, PAGE_KERNEL_RO);
|
|
set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO);
|
|
set_page_prot(level2_fixmap_pgt, PAGE_KERNEL_RO);
|
|
|
|
/* Pin down new L4 */
|
|
pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE,
|
|
PFN_DOWN(__pa_symbol(init_level4_pgt)));
|
|
|
|
/* Unpin Xen-provided one */
|
|
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
|
|
|
|
/* Switch over */
|
|
pgd = init_level4_pgt;
|
|
|
|
/*
|
|
* At this stage there can be no user pgd, and no page
|
|
* structure to attach it to, so make sure we just set kernel
|
|
* pgd.
|
|
*/
|
|
xen_mc_batch();
|
|
__xen_write_cr3(true, __pa(pgd));
|
|
xen_mc_issue(PARAVIRT_LAZY_CPU);
|
|
|
|
reserve_early(__pa(xen_start_info->pt_base),
|
|
__pa(xen_start_info->pt_base +
|
|
xen_start_info->nr_pt_frames * PAGE_SIZE),
|
|
"XEN PAGETABLES");
|
|
|
|
return pgd;
|
|
}
|
|
#else /* !CONFIG_X86_64 */
|
|
static pmd_t level2_kernel_pgt[PTRS_PER_PMD] __page_aligned_bss;
|
|
|
|
static __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
|
|
unsigned long max_pfn)
|
|
{
|
|
pmd_t *kernel_pmd;
|
|
|
|
init_pg_tables_start = __pa(pgd);
|
|
init_pg_tables_end = __pa(pgd) + xen_start_info->nr_pt_frames*PAGE_SIZE;
|
|
max_pfn_mapped = PFN_DOWN(init_pg_tables_end + 512*1024);
|
|
|
|
kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
|
|
memcpy(level2_kernel_pgt, kernel_pmd, sizeof(pmd_t) * PTRS_PER_PMD);
|
|
|
|
xen_map_identity_early(level2_kernel_pgt, max_pfn);
|
|
|
|
memcpy(swapper_pg_dir, pgd, sizeof(pgd_t) * PTRS_PER_PGD);
|
|
set_pgd(&swapper_pg_dir[KERNEL_PGD_BOUNDARY],
|
|
__pgd(__pa(level2_kernel_pgt) | _PAGE_PRESENT));
|
|
|
|
set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO);
|
|
set_page_prot(swapper_pg_dir, PAGE_KERNEL_RO);
|
|
set_page_prot(empty_zero_page, PAGE_KERNEL_RO);
|
|
|
|
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
|
|
|
|
xen_write_cr3(__pa(swapper_pg_dir));
|
|
|
|
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(swapper_pg_dir)));
|
|
|
|
return swapper_pg_dir;
|
|
}
|
|
#endif /* CONFIG_X86_64 */
|
|
|
|
/* First C function to be called on Xen boot */
|
|
asmlinkage void __init xen_start_kernel(void)
|
|
{
|
|
pgd_t *pgd;
|
|
|
|
if (!xen_start_info)
|
|
return;
|
|
|
|
xen_domain_type = XEN_PV_DOMAIN;
|
|
|
|
BUG_ON(memcmp(xen_start_info->magic, "xen-3", 5) != 0);
|
|
|
|
xen_setup_features();
|
|
|
|
/* 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_apic_ops = xen_apic_ops;
|
|
pv_mmu_ops = xen_mmu_ops;
|
|
|
|
xen_init_irq_ops();
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
/*
|
|
* set up the basic apic ops.
|
|
*/
|
|
apic_ops = &xen_basic_apic_ops;
|
|
#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;
|
|
|
|
#ifdef CONFIG_X86_64
|
|
/* Disable until direct per-cpu data access. */
|
|
have_vcpu_info_placement = 0;
|
|
x86_64_init_pda();
|
|
#endif
|
|
|
|
xen_smp_init();
|
|
|
|
/* Get mfn list */
|
|
if (!xen_feature(XENFEAT_auto_translated_physmap))
|
|
xen_build_dynamic_phys_to_machine();
|
|
|
|
pgd = (pgd_t *)xen_start_info->pt_base;
|
|
|
|
/* Prevent unwanted bits from being set in PTEs. */
|
|
__supported_pte_mask &= ~_PAGE_GLOBAL;
|
|
if (!xen_initial_domain())
|
|
__supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD);
|
|
|
|
/* 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];
|
|
|
|
xen_raw_console_write("mapping kernel into physical memory\n");
|
|
pgd = xen_setup_kernel_pagetable(pgd, xen_start_info->nr_pages);
|
|
|
|
init_mm.pgd = pgd;
|
|
|
|
/* keep using Xen gdt for now; no urgent need to change it */
|
|
|
|
pv_info.kernel_rpl = 1;
|
|
if (xen_feature(XENFEAT_supervisor_mode_kernel))
|
|
pv_info.kernel_rpl = 0;
|
|
|
|
/* set the limit of our address space */
|
|
xen_reserve_top();
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/* set up basic CPUID stuff */
|
|
cpu_detect(&new_cpu_data);
|
|
new_cpu_data.hard_math = 1;
|
|
new_cpu_data.x86_capability[0] = cpuid_edx(1);
|
|
#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);
|
|
}
|
|
|
|
xen_raw_console_write("about to get started...\n");
|
|
|
|
/* Start the world */
|
|
#ifdef CONFIG_X86_32
|
|
i386_start_kernel();
|
|
#else
|
|
x86_64_start_reservations((char *)__pa_symbol(&boot_params));
|
|
#endif
|
|
}
|