diff options
Diffstat (limited to 'arch/x86/hyperv/hv_init.c')
| -rw-r--r-- | arch/x86/hyperv/hv_init.c | 77 |
1 files changed, 71 insertions, 6 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 2edc49e7409b..4c431e1c1eff 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -21,7 +21,7 @@ #include <asm/apic.h> #include <asm/desc.h> #include <asm/hypervisor.h> -#include <asm/hyperv.h> +#include <asm/hyperv-tlfs.h> #include <asm/mshyperv.h> #include <linux/version.h> #include <linux/vmalloc.h> @@ -88,11 +88,22 @@ EXPORT_SYMBOL_GPL(hyperv_cs); u32 *hv_vp_index; EXPORT_SYMBOL_GPL(hv_vp_index); +struct hv_vp_assist_page **hv_vp_assist_page; +EXPORT_SYMBOL_GPL(hv_vp_assist_page); + +void __percpu **hyperv_pcpu_input_arg; +EXPORT_SYMBOL_GPL(hyperv_pcpu_input_arg); + u32 hv_max_vp_index; static int hv_cpu_init(unsigned int cpu) { u64 msr_vp_index; + struct hv_vp_assist_page **hvp = &hv_vp_assist_page[smp_processor_id()]; + void **input_arg; + + input_arg = (void **)this_cpu_ptr(hyperv_pcpu_input_arg); + *input_arg = page_address(alloc_page(GFP_KERNEL)); hv_get_vp_index(msr_vp_index); @@ -101,6 +112,22 @@ static int hv_cpu_init(unsigned int cpu) if (msr_vp_index > hv_max_vp_index) hv_max_vp_index = msr_vp_index; + if (!hv_vp_assist_page) + return 0; + + if (!*hvp) + *hvp = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL); + + if (*hvp) { + u64 val; + + val = vmalloc_to_pfn(*hvp); + val = (val << HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT) | + HV_X64_MSR_VP_ASSIST_PAGE_ENABLE; + + wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, val); + } + return 0; } @@ -197,6 +224,19 @@ static int hv_cpu_die(unsigned int cpu) { struct hv_reenlightenment_control re_ctrl; unsigned int new_cpu; + unsigned long flags; + void **input_arg; + void *input_pg = NULL; + + local_irq_save(flags); + input_arg = (void **)this_cpu_ptr(hyperv_pcpu_input_arg); + input_pg = *input_arg; + *input_arg = NULL; + local_irq_restore(flags); + free_page((unsigned long)input_pg); + + if (hv_vp_assist_page && hv_vp_assist_page[cpu]) + wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, 0); if (hv_reenlightenment_cb == NULL) return 0; @@ -219,11 +259,13 @@ static int hv_cpu_die(unsigned int cpu) * * 1. Setup the hypercall page. * 2. Register Hyper-V specific clocksource. + * 3. Setup Hyper-V specific APIC entry points. */ -void hyperv_init(void) +void __init hyperv_init(void) { u64 guest_id, required_msrs; union hv_x64_msr_hypercall_contents hypercall_msr; + int cpuhp; if (x86_hyper_type != X86_HYPER_MS_HYPERV) return; @@ -235,15 +277,33 @@ void hyperv_init(void) if ((ms_hyperv.features & required_msrs) != required_msrs) return; + /* + * Allocate the per-CPU state for the hypercall input arg. + * If this allocation fails, we will not be able to setup + * (per-CPU) hypercall input page and thus this failure is + * fatal on Hyper-V. + */ + hyperv_pcpu_input_arg = alloc_percpu(void *); + + BUG_ON(hyperv_pcpu_input_arg == NULL); + /* Allocate percpu VP index */ hv_vp_index = kmalloc_array(num_possible_cpus(), sizeof(*hv_vp_index), GFP_KERNEL); if (!hv_vp_index) return; - if (cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv_init:online", - hv_cpu_init, hv_cpu_die) < 0) + hv_vp_assist_page = kcalloc(num_possible_cpus(), + sizeof(*hv_vp_assist_page), GFP_KERNEL); + if (!hv_vp_assist_page) { + ms_hyperv.hints &= ~HV_X64_ENLIGHTENED_VMCS_RECOMMENDED; goto free_vp_index; + } + + cpuhp = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv_init:online", + hv_cpu_init, hv_cpu_die); + if (cpuhp < 0) + goto free_vp_assist_page; /* * Setup the hypercall page and enable hypercalls. @@ -256,7 +316,7 @@ void hyperv_init(void) hv_hypercall_pg = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_RX); if (hv_hypercall_pg == NULL) { wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); - goto free_vp_index; + goto remove_cpuhp_state; } rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); @@ -264,7 +324,7 @@ void hyperv_init(void) hypercall_msr.guest_physical_address = vmalloc_to_pfn(hv_hypercall_pg); wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); - hyper_alloc_mmu(); + hv_apic_init(); /* * Register Hyper-V specific clocksource. @@ -304,6 +364,11 @@ register_msr_cs: return; +remove_cpuhp_state: + cpuhp_remove_state(cpuhp); +free_vp_assist_page: + kfree(hv_vp_assist_page); + hv_vp_assist_page = NULL; free_vp_index: kfree(hv_vp_index); hv_vp_index = NULL; |