diff options
Diffstat (limited to 'arch/x86/hyperv/hv_init.c')
| -rw-r--r-- | arch/x86/hyperv/hv_init.c | 82 |
1 files changed, 61 insertions, 21 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 708a2712a516..24f4a06ac46a 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -36,12 +36,42 @@ EXPORT_SYMBOL_GPL(hv_current_partition_id); void *hv_hypercall_pg; EXPORT_SYMBOL_GPL(hv_hypercall_pg); +union hv_ghcb __percpu **hv_ghcb_pg; + /* Storage to save the hypercall page temporarily for hibernation */ static void *hv_hypercall_pg_saved; struct hv_vp_assist_page **hv_vp_assist_page; EXPORT_SYMBOL_GPL(hv_vp_assist_page); +static int hyperv_init_ghcb(void) +{ + u64 ghcb_gpa; + void *ghcb_va; + void **ghcb_base; + + if (!hv_isolation_type_snp()) + return 0; + + if (!hv_ghcb_pg) + return -EINVAL; + + /* + * GHCB page is allocated by paravisor. The address + * returned by MSR_AMD64_SEV_ES_GHCB is above shared + * memory boundary and map it here. + */ + rdmsrl(MSR_AMD64_SEV_ES_GHCB, ghcb_gpa); + ghcb_va = memremap(ghcb_gpa, HV_HYP_PAGE_SIZE, MEMREMAP_WB); + if (!ghcb_va) + return -ENOMEM; + + ghcb_base = (void **)this_cpu_ptr(hv_ghcb_pg); + *ghcb_base = ghcb_va; + + return 0; +} + static int hv_cpu_init(unsigned int cpu) { union hv_vp_assist_msr_contents msr = { 0 }; @@ -85,7 +115,7 @@ static int hv_cpu_init(unsigned int cpu) } } - return 0; + return hyperv_init_ghcb(); } static void (*hv_reenlightenment_cb)(void); @@ -139,7 +169,6 @@ void set_hv_tscchange_cb(void (*cb)(void)) struct hv_reenlightenment_control re_ctrl = { .vector = HYPERV_REENLIGHTENMENT_VECTOR, .enabled = 1, - .target_vp = hv_vp_index[smp_processor_id()] }; struct hv_tsc_emulation_control emu_ctrl = {.enabled = 1}; @@ -153,8 +182,12 @@ void set_hv_tscchange_cb(void (*cb)(void)) /* Make sure callback is registered before we write to MSRs */ wmb(); + re_ctrl.target_vp = hv_vp_index[get_cpu()]; + wrmsrl(HV_X64_MSR_REENLIGHTENMENT_CONTROL, *((u64 *)&re_ctrl)); wrmsrl(HV_X64_MSR_TSC_EMULATION_CONTROL, *((u64 *)&emu_ctrl)); + + put_cpu(); } EXPORT_SYMBOL_GPL(set_hv_tscchange_cb); @@ -177,6 +210,14 @@ static int hv_cpu_die(unsigned int cpu) { struct hv_reenlightenment_control re_ctrl; unsigned int new_cpu; + void **ghcb_va; + + if (hv_ghcb_pg) { + ghcb_va = (void **)this_cpu_ptr(hv_ghcb_pg); + if (*ghcb_va) + memunmap(*ghcb_va); + *ghcb_va = NULL; + } hv_common_cpu_die(cpu); @@ -366,10 +407,16 @@ void __init hyperv_init(void) goto common_free; } + if (hv_isolation_type_snp()) { + hv_ghcb_pg = alloc_percpu(union hv_ghcb *); + if (!hv_ghcb_pg) + goto free_vp_assist_page; + } + 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; + goto free_ghcb_page; /* * Setup the hypercall page and enable hypercalls. @@ -379,14 +426,15 @@ void __init hyperv_init(void) guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0); wrmsrl(HV_X64_MSR_GUEST_OS_ID, guest_id); + /* Hyper-V requires to write guest os id via ghcb in SNP IVM. */ + hv_ghcb_msr_write(HV_X64_MSR_GUEST_OS_ID, guest_id); + hv_hypercall_pg = __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END, GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS, NUMA_NO_NODE, __builtin_return_address(0)); - if (hv_hypercall_pg == NULL) { - wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); - goto remove_cpuhp_state; - } + if (hv_hypercall_pg == NULL) + goto clean_guest_os_id; rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); hypercall_msr.enable = 1; @@ -456,8 +504,12 @@ void __init hyperv_init(void) hv_query_ext_cap(0); return; -remove_cpuhp_state: +clean_guest_os_id: + wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); + hv_ghcb_msr_write(HV_X64_MSR_GUEST_OS_ID, 0); cpuhp_remove_state(cpuhp); +free_ghcb_page: + free_percpu(hv_ghcb_pg); free_vp_assist_page: kfree(hv_vp_assist_page); hv_vp_assist_page = NULL; @@ -476,6 +528,7 @@ void hyperv_cleanup(void) /* Reset our OS id */ wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); + hv_ghcb_msr_write(HV_X64_MSR_GUEST_OS_ID, 0); /* * Reset hypercall page reference before reset the page, @@ -546,16 +599,3 @@ bool hv_is_hyperv_initialized(void) return hypercall_msr.enable; } EXPORT_SYMBOL_GPL(hv_is_hyperv_initialized); - -enum hv_isolation_type hv_get_isolation_type(void) -{ - if (!(ms_hyperv.priv_high & HV_ISOLATION)) - return HV_ISOLATION_TYPE_NONE; - return FIELD_GET(HV_ISOLATION_TYPE, ms_hyperv.isolation_config_b); -} -EXPORT_SYMBOL_GPL(hv_get_isolation_type); - -bool hv_is_isolation_supported(void) -{ - return hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE; -} |