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@@ -1,93 +1,16 @@
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-/*
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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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-
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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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-
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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/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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#include <asm/e820/api.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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-
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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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@@ -134,14 +57,6 @@ 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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-
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-RESERVE_BRK(shared_info_page_brk, PAGE_SIZE);
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-
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-static int xen_cpu_up_prepare_pv(unsigned int cpu);
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-static int xen_cpu_up_online(unsigned int cpu);
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-static int xen_cpu_dead_pv(unsigned int cpu);
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-
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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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@@ -163,18 +78,30 @@ struct shared_info *HYPERVISOR_shared_info = &xen_dummy_shared_info;
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*/
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int xen_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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+static int xen_cpu_up_online(unsigned int cpu)
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+{
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+ xen_init_lock_cpu(cpu);
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+ return 0;
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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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+int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
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+ int (*cpu_dead_cb)(unsigned int))
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+{
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+ int rc;
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+
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+ rc = cpuhp_setup_state_nocalls(CPUHP_XEN_PREPARE,
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+ "x86/xen/hvm_guest:prepare",
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+ cpu_up_prepare_cb, cpu_dead_cb);
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+ if (rc >= 0) {
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+ rc = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
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+ "x86/xen/hvm_guest:online",
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+ xen_cpu_up_online, NULL);
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+ if (rc < 0)
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+ cpuhp_remove_state_nocalls(CPUHP_XEN_PREPARE);
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+ }
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+
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+ return rc >= 0 ? 0 : rc;
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+}
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static void clamp_max_cpus(void)
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{
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@@ -243,1510 +170,81 @@ void xen_vcpu_setup(int cpu)
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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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+void xen_reboot(int reason)
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{
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+ struct sched_shutdown r = { .reason = reason };
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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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-
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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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-
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- xen_setup_runstate_info(cpu);
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-
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- if (xen_have_vcpu_info_placement)
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- xen_vcpu_setup(cpu);
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-
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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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-
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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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-
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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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-
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- if (!xen_domain())
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- return false;
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-
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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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-
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-#define CPUID_THERM_POWER_LEAF 6
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-#define APERFMPERF_PRESENT 0
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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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- /*
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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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-
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- ax = 1;
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- cx = 0;
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-
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- native_cpuid(&ax, &bx, &cx, &dx);
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-
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- mwait_mask = (1 << (X86_FEATURE_EST % 32)) |
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- (1 << (X86_FEATURE_MWAIT % 32));
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-
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- if ((cx & mwait_mask) != mwait_mask)
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- return false;
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-
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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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-
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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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-
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- native_cpuid(&ax, &bx, &cx, &dx);
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-
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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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-
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- set_xen_guest_handle(op.u.set_pminfo.pdc, buf);
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-
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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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-
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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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-
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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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-
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- cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_X2APIC % 32));
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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-}
|
|
|
-
|
|
|
-/*
|
|
|
- * 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);
|
|
|
+ for_each_online_cpu(cpu)
|
|
|
+ xen_pmu_finish(cpu);
|
|
|
|
|
|
- if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0))
|
|
|
+ if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
|
|
|
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)
|
|
|
+void xen_emergency_restart(void)
|
|
|
{
|
|
|
- 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);
|
|
|
+ xen_reboot(SHUTDOWN_reboot);
|
|
|
}
|
|
|
|
|
|
-static void xen_load_gdt(const struct desc_ptr *dtr)
|
|
|
+static int
|
|
|
+xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
|
{
|
|
|
- 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();
|
|
|
+ if (!kexec_crash_loaded())
|
|
|
+ xen_reboot(SHUTDOWN_crash);
|
|
|
+ return NOTIFY_DONE;
|
|
|
}
|
|
|
|
|
|
-/*
|
|
|
- * 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 struct notifier_block xen_panic_block = {
|
|
|
+ .notifier_call = xen_panic_event,
|
|
|
+ .priority = INT_MIN
|
|
|
+};
|
|
|
|
|
|
-static inline bool desc_equal(const struct desc_struct *d1,
|
|
|
- const struct desc_struct *d2)
|
|
|
+int xen_panic_handler_init(void)
|
|
|
{
|
|
|
- return d1->a == d2->a && d1->b == d2->b;
|
|
|
+ atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block);
|
|
|
+ return 0;
|
|
|
}
|
|
|
|
|
|
-static void load_TLS_descriptor(struct thread_struct *t,
|
|
|
- unsigned int cpu, unsigned int i)
|
|
|
+void xen_pin_vcpu(int cpu)
|
|
|
{
|
|
|
- struct desc_struct *shadow = &per_cpu(shadow_tls_desc, cpu).desc[i];
|
|
|
- struct desc_struct *gdt;
|
|
|
- xmaddr_t maddr;
|
|
|
- struct multicall_space mc;
|
|
|
+ static bool disable_pinning;
|
|
|
+ struct sched_pin_override pin_override;
|
|
|
+ int ret;
|
|
|
|
|
|
- if (desc_equal(shadow, &t->tls_array[i]))
|
|
|
+ if (disable_pinning)
|
|
|
return;
|
|
|
|
|
|
- *shadow = t->tls_array[i];
|
|
|
-
|
|
|
- gdt = get_cpu_gdt_rw(cpu);
|
|
|
- maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
|
|
|
- mc = __xen_mc_entry(0);
|
|
|
+ pin_override.pcpu = cpu;
|
|
|
+ ret = HYPERVISOR_sched_op(SCHEDOP_pin_override, &pin_override);
|
|
|
|
|
|
- MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]);
|
|
|
-}
|
|
|
+ /* Ignore errors when removing override. */
|
|
|
+ if (cpu < 0)
|
|
|
+ return;
|
|
|
|
|
|
-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
|
|
|
+ switch (ret) {
|
|
|
+ case -ENOSYS:
|
|
|
+ pr_warn("Unable to pin on physical cpu %d. In case of problems consider vcpu pinning.\n",
|
|
|
+ cpu);
|
|
|
+ disable_pinning = true;
|
|
|
+ break;
|
|
|
+ case -EPERM:
|
|
|
+ WARN(1, "Trying to pin vcpu without having privilege to do so\n");
|
|
|
+ disable_pinning = true;
|
|
|
+ break;
|
|
|
+ case -EINVAL:
|
|
|
+ case -EBUSY:
|
|
|
+ pr_warn("Physical cpu %d not available for pinning. Check Xen cpu configuration.\n",
|
|
|
+ cpu);
|
|
|
+ break;
|
|
|
+ case 0:
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ WARN(1, "rc %d while trying to pin vcpu\n", ret);
|
|
|
+ disable_pinning = true;
|
|
|
}
|
|
|
-
|
|
|
- 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 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.
|
|
|
- */
|
|
|
- if (xen_have_vcpu_info_placement) {
|
|
|
- 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 (xen_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,
|
|
|
-
|
|
|
- .read_cr0 = xen_read_cr0,
|
|
|
- .write_cr0 = xen_write_cr0,
|
|
|
-
|
|
|
- .read_cr4 = native_read_cr4,
|
|
|
- .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,
|
|
|
-};
|
|
|
-
|
|
|
-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);
|
|
|
-}
|
|
|
-
|
|
|
-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.
|
|
|
- */
|
|
|
-static void xen_setup_gdt(int cpu)
|
|
|
-{
|
|
|
- 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;
|
|
|
-}
|
|
|
-
|
|
|
-static void __init xen_dom0_set_legacy_features(void)
|
|
|
-{
|
|
|
- x86_platform.legacy.rtc = 1;
|
|
|
-}
|
|
|
-
|
|
|
-int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
|
|
|
- int (*cpu_dead_cb)(unsigned int))
|
|
|
-{
|
|
|
- int rc;
|
|
|
-
|
|
|
- rc = cpuhp_setup_state_nocalls(CPUHP_XEN_PREPARE,
|
|
|
- "x86/xen/hvm_guest:prepare",
|
|
|
- cpu_up_prepare_cb, cpu_dead_cb);
|
|
|
- if (rc >= 0) {
|
|
|
- rc = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
|
|
|
- "x86/xen/hvm_guest:online",
|
|
|
- xen_cpu_up_online, NULL);
|
|
|
- if (rc < 0)
|
|
|
- cpuhp_remove_state_nocalls(CPUHP_XEN_PREPARE);
|
|
|
- }
|
|
|
-
|
|
|
- return rc >= 0 ? 0 : rc;
|
|
|
-}
|
|
|
-
|
|
|
-/* 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();
|
|
|
-
|
|
|
- xen_setup_machphys_mapping();
|
|
|
-
|
|
|
- /* Install Xen paravirt ops */
|
|
|
- pv_info = xen_info;
|
|
|
- pv_init_ops = xen_init_ops;
|
|
|
- pv_cpu_ops = xen_cpu_ops;
|
|
|
-
|
|
|
- x86_platform.get_nmi_reason = xen_get_nmi_reason;
|
|
|
-
|
|
|
- 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];
|
|
|
-
|
|
|
- WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_pv, xen_cpu_dead_pv));
|
|
|
-
|
|
|
- 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();
|
|
|
-
|
|
|
- /*
|
|
|
- * 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.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
|
|
|
-}
|
|
|
-
|
|
|
-static int xen_cpu_up_prepare_pv(unsigned int cpu)
|
|
|
-{
|
|
|
- int rc;
|
|
|
-
|
|
|
- xen_setup_timer(cpu);
|
|
|
-
|
|
|
- rc = xen_smp_intr_init(cpu);
|
|
|
- if (rc) {
|
|
|
- WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",
|
|
|
- cpu, rc);
|
|
|
- return rc;
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static int xen_cpu_dead_pv(unsigned int cpu)
|
|
|
-{
|
|
|
- xen_smp_intr_free(cpu);
|
|
|
-
|
|
|
- xen_teardown_timer(cpu);
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static int xen_cpu_up_online(unsigned int cpu)
|
|
|
-{
|
|
|
- xen_init_lock_cpu(cpu);
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static uint32_t __init xen_platform_pv(void)
|
|
|
-{
|
|
|
- if (xen_pv_domain())
|
|
|
- return xen_cpuid_base();
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static void xen_set_cpu_features(struct cpuinfo_x86 *c)
|
|
|
-{
|
|
|
- clear_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
|
|
|
- set_cpu_cap(c, X86_FEATURE_XENPV);
|
|
|
-}
|
|
|
-
|
|
|
-void xen_pin_vcpu(int cpu)
|
|
|
-{
|
|
|
- static bool disable_pinning;
|
|
|
- struct sched_pin_override pin_override;
|
|
|
- int ret;
|
|
|
-
|
|
|
- if (disable_pinning)
|
|
|
- return;
|
|
|
-
|
|
|
- pin_override.pcpu = cpu;
|
|
|
- ret = HYPERVISOR_sched_op(SCHEDOP_pin_override, &pin_override);
|
|
|
-
|
|
|
- /* Ignore errors when removing override. */
|
|
|
- if (cpu < 0)
|
|
|
- return;
|
|
|
-
|
|
|
- switch (ret) {
|
|
|
- case -ENOSYS:
|
|
|
- pr_warn("Unable to pin on physical cpu %d. In case of problems consider vcpu pinning.\n",
|
|
|
- cpu);
|
|
|
- disable_pinning = true;
|
|
|
- break;
|
|
|
- case -EPERM:
|
|
|
- WARN(1, "Trying to pin vcpu without having privilege to do so\n");
|
|
|
- disable_pinning = true;
|
|
|
- break;
|
|
|
- case -EINVAL:
|
|
|
- case -EBUSY:
|
|
|
- pr_warn("Physical cpu %d not available for pinning. Check Xen cpu configuration.\n",
|
|
|
- cpu);
|
|
|
- break;
|
|
|
- case 0:
|
|
|
- break;
|
|
|
- default:
|
|
|
- WARN(1, "rc %d while trying to pin vcpu\n", ret);
|
|
|
- disable_pinning = true;
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-const struct hypervisor_x86 x86_hyper_xen_pv = {
|
|
|
- .name = "Xen PV",
|
|
|
- .detect = xen_platform_pv,
|
|
|
- .set_cpu_features = xen_set_cpu_features,
|
|
|
- .pin_vcpu = xen_pin_vcpu,
|
|
|
-};
|
|
|
-EXPORT_SYMBOL(x86_hyper_xen_pv);
|
|
|
-
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
|
void xen_arch_register_cpu(int num)
|
|
|
{
|
Vitaly Kuznetsov