1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/types.h> 3 #include <linux/tick.h> 4 #include <linux/percpu-defs.h> 5 6 #include <xen/xen.h> 7 #include <xen/interface/xen.h> 8 #include <xen/grant_table.h> 9 #include <xen/events.h> 10 11 #include <asm/cpufeatures.h> 12 #include <asm/msr-index.h> 13 #include <asm/xen/hypercall.h> 14 #include <asm/xen/page.h> 15 #include <asm/fixmap.h> 16 17 #include "xen-ops.h" 18 #include "mmu.h" 19 #include "pmu.h" 20 21 static DEFINE_PER_CPU(u64, spec_ctrl); 22 23 void xen_arch_pre_suspend(void) 24 { 25 xen_save_time_memory_area(); 26 27 if (xen_pv_domain()) 28 xen_pv_pre_suspend(); 29 } 30 31 void xen_arch_post_suspend(int cancelled) 32 { 33 if (xen_pv_domain()) 34 xen_pv_post_suspend(cancelled); 35 else 36 xen_hvm_post_suspend(cancelled); 37 38 xen_restore_time_memory_area(); 39 } 40 41 static void xen_vcpu_notify_restore(void *data) 42 { 43 if (xen_pv_domain() && boot_cpu_has(X86_FEATURE_SPEC_CTRL)) 44 wrmsrl(MSR_IA32_SPEC_CTRL, this_cpu_read(spec_ctrl)); 45 46 /* Boot processor notified via generic timekeeping_resume() */ 47 if (smp_processor_id() == 0) 48 return; 49 50 tick_resume_local(); 51 } 52 53 static void xen_vcpu_notify_suspend(void *data) 54 { 55 u64 tmp; 56 57 tick_suspend_local(); 58 59 if (xen_pv_domain() && boot_cpu_has(X86_FEATURE_SPEC_CTRL)) { 60 rdmsrl(MSR_IA32_SPEC_CTRL, tmp); 61 this_cpu_write(spec_ctrl, tmp); 62 wrmsrl(MSR_IA32_SPEC_CTRL, 0); 63 } 64 } 65 66 void xen_arch_resume(void) 67 { 68 int cpu; 69 70 on_each_cpu(xen_vcpu_notify_restore, NULL, 1); 71 72 for_each_online_cpu(cpu) 73 xen_pmu_init(cpu); 74 } 75 76 void xen_arch_suspend(void) 77 { 78 int cpu; 79 80 for_each_online_cpu(cpu) 81 xen_pmu_finish(cpu); 82 83 on_each_cpu(xen_vcpu_notify_suspend, NULL, 1); 84 } 85