mm: fix exec activate_mm vs TLB shootdown and lazy tlb switching race
[linux/fpc-iii.git] / arch / x86 / xen / enlighten_hvm.c
blob854508b00bbb9ea9f9ca187261cb417c3c01adde
1 #include <linux/cpu.h>
2 #include <linux/kexec.h>
3 #include <linux/memblock.h>
5 #include <xen/features.h>
6 #include <xen/events.h>
7 #include <xen/interface/memory.h>
9 #include <asm/cpu.h>
10 #include <asm/smp.h>
11 #include <asm/reboot.h>
12 #include <asm/setup.h>
13 #include <asm/hypervisor.h>
14 #include <asm/e820/api.h>
15 #include <asm/early_ioremap.h>
17 #include <asm/xen/cpuid.h>
18 #include <asm/xen/hypervisor.h>
19 #include <asm/xen/page.h>
21 #include "xen-ops.h"
22 #include "mmu.h"
23 #include "smp.h"
25 static unsigned long shared_info_pfn;
27 void xen_hvm_init_shared_info(void)
29 struct xen_add_to_physmap xatp;
31 xatp.domid = DOMID_SELF;
32 xatp.idx = 0;
33 xatp.space = XENMAPSPACE_shared_info;
34 xatp.gpfn = shared_info_pfn;
35 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
36 BUG();
39 static void __init reserve_shared_info(void)
41 u64 pa;
44 * Search for a free page starting at 4kB physical address.
45 * Low memory is preferred to avoid an EPT large page split up
46 * by the mapping.
47 * Starting below X86_RESERVE_LOW (usually 64kB) is fine as
48 * the BIOS used for HVM guests is well behaved and won't
49 * clobber memory other than the first 4kB.
51 for (pa = PAGE_SIZE;
52 !e820__mapped_all(pa, pa + PAGE_SIZE, E820_TYPE_RAM) ||
53 memblock_is_reserved(pa);
54 pa += PAGE_SIZE)
57 shared_info_pfn = PHYS_PFN(pa);
59 memblock_reserve(pa, PAGE_SIZE);
60 HYPERVISOR_shared_info = early_memremap(pa, PAGE_SIZE);
63 static void __init xen_hvm_init_mem_mapping(void)
65 early_memunmap(HYPERVISOR_shared_info, PAGE_SIZE);
66 HYPERVISOR_shared_info = __va(PFN_PHYS(shared_info_pfn));
69 * The virtual address of the shared_info page has changed, so
70 * the vcpu_info pointer for VCPU 0 is now stale.
72 * The prepare_boot_cpu callback will re-initialize it via
73 * xen_vcpu_setup, but we can't rely on that to be called for
74 * old Xen versions (xen_have_vector_callback == 0).
76 * It is, in any case, bad to have a stale vcpu_info pointer
77 * so reset it now.
79 xen_vcpu_info_reset(0);
82 static void __init init_hvm_pv_info(void)
84 int major, minor;
85 uint32_t eax, ebx, ecx, edx, base;
87 base = xen_cpuid_base();
88 eax = cpuid_eax(base + 1);
90 major = eax >> 16;
91 minor = eax & 0xffff;
92 printk(KERN_INFO "Xen version %d.%d.\n", major, minor);
94 xen_domain_type = XEN_HVM_DOMAIN;
96 /* PVH set up hypercall page in xen_prepare_pvh(). */
97 if (xen_pvh_domain())
98 pv_info.name = "Xen PVH";
99 else {
100 u64 pfn;
101 uint32_t msr;
103 pv_info.name = "Xen HVM";
104 msr = cpuid_ebx(base + 2);
105 pfn = __pa(hypercall_page);
106 wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
109 xen_setup_features();
111 cpuid(base + 4, &eax, &ebx, &ecx, &edx);
112 if (eax & XEN_HVM_CPUID_VCPU_ID_PRESENT)
113 this_cpu_write(xen_vcpu_id, ebx);
114 else
115 this_cpu_write(xen_vcpu_id, smp_processor_id());
118 #ifdef CONFIG_KEXEC_CORE
119 static void xen_hvm_shutdown(void)
121 native_machine_shutdown();
122 if (kexec_in_progress)
123 xen_reboot(SHUTDOWN_soft_reset);
126 static void xen_hvm_crash_shutdown(struct pt_regs *regs)
128 native_machine_crash_shutdown(regs);
129 xen_reboot(SHUTDOWN_soft_reset);
131 #endif
133 static int xen_cpu_up_prepare_hvm(unsigned int cpu)
135 int rc = 0;
138 * This can happen if CPU was offlined earlier and
139 * offlining timed out in common_cpu_die().
141 if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) {
142 xen_smp_intr_free(cpu);
143 xen_uninit_lock_cpu(cpu);
146 if (cpu_acpi_id(cpu) != U32_MAX)
147 per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);
148 else
149 per_cpu(xen_vcpu_id, cpu) = cpu;
150 rc = xen_vcpu_setup(cpu);
151 if (rc)
152 return rc;
154 if (xen_have_vector_callback && xen_feature(XENFEAT_hvm_safe_pvclock))
155 xen_setup_timer(cpu);
157 rc = xen_smp_intr_init(cpu);
158 if (rc) {
159 WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",
160 cpu, rc);
162 return rc;
165 static int xen_cpu_dead_hvm(unsigned int cpu)
167 xen_smp_intr_free(cpu);
169 if (xen_have_vector_callback && xen_feature(XENFEAT_hvm_safe_pvclock))
170 xen_teardown_timer(cpu);
172 return 0;
175 static void __init xen_hvm_guest_init(void)
177 if (xen_pv_domain())
178 return;
180 init_hvm_pv_info();
182 reserve_shared_info();
183 xen_hvm_init_shared_info();
186 * xen_vcpu is a pointer to the vcpu_info struct in the shared_info
187 * page, we use it in the event channel upcall and in some pvclock
188 * related functions.
190 xen_vcpu_info_reset(0);
192 xen_panic_handler_init();
194 if (xen_feature(XENFEAT_hvm_callback_vector))
195 xen_have_vector_callback = 1;
197 xen_hvm_smp_init();
198 WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_hvm, xen_cpu_dead_hvm));
199 xen_unplug_emulated_devices();
200 x86_init.irqs.intr_init = xen_init_IRQ;
201 xen_hvm_init_time_ops();
202 xen_hvm_init_mmu_ops();
204 if (xen_pvh_domain())
205 machine_ops.emergency_restart = xen_emergency_restart;
206 #ifdef CONFIG_KEXEC_CORE
207 machine_ops.shutdown = xen_hvm_shutdown;
208 machine_ops.crash_shutdown = xen_hvm_crash_shutdown;
209 #endif
212 static bool xen_nopv;
213 static __init int xen_parse_nopv(char *arg)
215 xen_nopv = true;
216 return 0;
218 early_param("xen_nopv", xen_parse_nopv);
220 bool xen_hvm_need_lapic(void)
222 if (xen_nopv)
223 return false;
224 if (xen_pv_domain())
225 return false;
226 if (!xen_hvm_domain())
227 return false;
228 if (xen_feature(XENFEAT_hvm_pirqs) && xen_have_vector_callback)
229 return false;
230 return true;
232 EXPORT_SYMBOL_GPL(xen_hvm_need_lapic);
234 static uint32_t __init xen_platform_hvm(void)
236 if (xen_pv_domain() || xen_nopv)
237 return 0;
239 return xen_cpuid_base();
242 const __initconst struct hypervisor_x86 x86_hyper_xen_hvm = {
243 .name = "Xen HVM",
244 .detect = xen_platform_hvm,
245 .type = X86_HYPER_XEN_HVM,
246 .init.init_platform = xen_hvm_guest_init,
247 .init.x2apic_available = xen_x2apic_para_available,
248 .init.init_mem_mapping = xen_hvm_init_mem_mapping,
249 .runtime.pin_vcpu = xen_pin_vcpu,