Linux 4.13.16
[linux/fpc-iii.git] / arch / x86 / xen / enlighten_hvm.c
blobde503c225ae1f194b10c71b44528ad2a2a7a4c0d
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 static void __init init_hvm_pv_info(void)
71 int major, minor;
72 uint32_t eax, ebx, ecx, edx, base;
74 base = xen_cpuid_base();
75 eax = cpuid_eax(base + 1);
77 major = eax >> 16;
78 minor = eax & 0xffff;
79 printk(KERN_INFO "Xen version %d.%d.\n", major, minor);
81 xen_domain_type = XEN_HVM_DOMAIN;
83 /* PVH set up hypercall page in xen_prepare_pvh(). */
84 if (xen_pvh_domain())
85 pv_info.name = "Xen PVH";
86 else {
87 u64 pfn;
88 uint32_t msr;
90 pv_info.name = "Xen HVM";
91 msr = cpuid_ebx(base + 2);
92 pfn = __pa(hypercall_page);
93 wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
96 xen_setup_features();
98 cpuid(base + 4, &eax, &ebx, &ecx, &edx);
99 if (eax & XEN_HVM_CPUID_VCPU_ID_PRESENT)
100 this_cpu_write(xen_vcpu_id, ebx);
101 else
102 this_cpu_write(xen_vcpu_id, smp_processor_id());
105 #ifdef CONFIG_KEXEC_CORE
106 static void xen_hvm_shutdown(void)
108 native_machine_shutdown();
109 if (kexec_in_progress)
110 xen_reboot(SHUTDOWN_soft_reset);
113 static void xen_hvm_crash_shutdown(struct pt_regs *regs)
115 native_machine_crash_shutdown(regs);
116 xen_reboot(SHUTDOWN_soft_reset);
118 #endif
120 static int xen_cpu_up_prepare_hvm(unsigned int cpu)
122 int rc = 0;
125 * This can happen if CPU was offlined earlier and
126 * offlining timed out in common_cpu_die().
128 if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) {
129 xen_smp_intr_free(cpu);
130 xen_uninit_lock_cpu(cpu);
133 if (cpu_acpi_id(cpu) != U32_MAX)
134 per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);
135 else
136 per_cpu(xen_vcpu_id, cpu) = cpu;
137 rc = xen_vcpu_setup(cpu);
138 if (rc)
139 return rc;
141 if (xen_have_vector_callback && xen_feature(XENFEAT_hvm_safe_pvclock))
142 xen_setup_timer(cpu);
144 rc = xen_smp_intr_init(cpu);
145 if (rc) {
146 WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",
147 cpu, rc);
149 return rc;
152 static int xen_cpu_dead_hvm(unsigned int cpu)
154 xen_smp_intr_free(cpu);
156 if (xen_have_vector_callback && xen_feature(XENFEAT_hvm_safe_pvclock))
157 xen_teardown_timer(cpu);
159 return 0;
162 static void __init xen_hvm_guest_init(void)
164 if (xen_pv_domain())
165 return;
167 init_hvm_pv_info();
169 reserve_shared_info();
170 xen_hvm_init_shared_info();
173 * xen_vcpu is a pointer to the vcpu_info struct in the shared_info
174 * page, we use it in the event channel upcall and in some pvclock
175 * related functions.
177 xen_vcpu_info_reset(0);
179 xen_panic_handler_init();
181 if (xen_feature(XENFEAT_hvm_callback_vector))
182 xen_have_vector_callback = 1;
184 xen_hvm_smp_init();
185 WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_hvm, xen_cpu_dead_hvm));
186 xen_unplug_emulated_devices();
187 x86_init.irqs.intr_init = xen_init_IRQ;
188 xen_hvm_init_time_ops();
189 xen_hvm_init_mmu_ops();
191 if (xen_pvh_domain())
192 machine_ops.emergency_restart = xen_emergency_restart;
193 #ifdef CONFIG_KEXEC_CORE
194 machine_ops.shutdown = xen_hvm_shutdown;
195 machine_ops.crash_shutdown = xen_hvm_crash_shutdown;
196 #endif
199 static bool xen_nopv;
200 static __init int xen_parse_nopv(char *arg)
202 xen_nopv = true;
203 return 0;
205 early_param("xen_nopv", xen_parse_nopv);
207 bool xen_hvm_need_lapic(void)
209 if (xen_nopv)
210 return false;
211 if (xen_pv_domain())
212 return false;
213 if (!xen_hvm_domain())
214 return false;
215 if (xen_feature(XENFEAT_hvm_pirqs) && xen_have_vector_callback)
216 return false;
217 return true;
219 EXPORT_SYMBOL_GPL(xen_hvm_need_lapic);
221 static uint32_t __init xen_platform_hvm(void)
223 if (xen_pv_domain() || xen_nopv)
224 return 0;
226 return xen_cpuid_base();
229 const struct hypervisor_x86 x86_hyper_xen_hvm = {
230 .name = "Xen HVM",
231 .detect = xen_platform_hvm,
232 .init_platform = xen_hvm_guest_init,
233 .pin_vcpu = xen_pin_vcpu,
234 .x2apic_available = xen_x2apic_para_available,
235 .init_mem_mapping = xen_hvm_init_mem_mapping,
237 EXPORT_SYMBOL(x86_hyper_xen_hvm);