diff options
| -rw-r--r-- | arch/x86/hyperv/hv_init.c | 21 | ||||
| -rw-r--r-- | arch/x86/include/asm/mshyperv.h | 4 | ||||
| -rw-r--r-- | drivers/hv/hv.c | 3 | ||||
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 5 |
4 files changed, 18 insertions, 15 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 189a398290db..a0a206556919 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -239,17 +239,24 @@ void hyperv_report_panic(struct pt_regs *regs, long err) } EXPORT_SYMBOL_GPL(hyperv_report_panic); -bool hv_is_hypercall_page_setup(void) +bool hv_is_hyperv_initialized(void) { union hv_x64_msr_hypercall_contents hypercall_msr; - /* Check if the hypercall page is setup */ + /* + * Ensure that we're really on Hyper-V, and not a KVM or Xen + * emulation of Hyper-V + */ + if (x86_hyper_type != X86_HYPER_MS_HYPERV) + return false; + + /* + * Verify that earlier initialization succeeded by checking + * that the hypercall page is setup + */ hypercall_msr.as_uint64 = 0; rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); - if (!hypercall_msr.enable) - return false; - - return true; + return hypercall_msr.enable; } -EXPORT_SYMBOL_GPL(hv_is_hypercall_page_setup); +EXPORT_SYMBOL_GPL(hv_is_hyperv_initialized); diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 5400add2885b..b623a4288e8b 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -312,11 +312,11 @@ void hyperv_init(void); void hyperv_setup_mmu_ops(void); void hyper_alloc_mmu(void); void hyperv_report_panic(struct pt_regs *regs, long err); -bool hv_is_hypercall_page_setup(void); +bool hv_is_hyperv_initialized(void); void hyperv_cleanup(void); #else /* CONFIG_HYPERV */ static inline void hyperv_init(void) {} -static inline bool hv_is_hypercall_page_setup(void) { return false; } +static inline bool hv_is_hyperv_initialized(void) { return false; } static inline void hyperv_cleanup(void) {} static inline void hyperv_setup_mmu_ops(void) {} #endif /* CONFIG_HYPERV */ diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 8267439dd1ee..fe96aab9e794 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -49,9 +49,6 @@ struct hv_context hv_context = { */ int hv_init(void) { - if (!hv_is_hypercall_page_setup()) - return -ENOTSUPP; - hv_context.cpu_context = alloc_percpu(struct hv_per_cpu_context); if (!hv_context.cpu_context) return -ENOMEM; diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 610223f0e945..398643bb67e2 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -37,7 +37,6 @@ #include <linux/sched/task_stack.h> #include <asm/hyperv.h> -#include <asm/hypervisor.h> #include <asm/mshyperv.h> #include <linux/notifier.h> #include <linux/ptrace.h> @@ -1053,7 +1052,7 @@ static int vmbus_bus_init(void) * Initialize the per-cpu interrupt state and * connect to the host. */ - ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv:online", + ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hyperv/vmbus:online", hv_synic_init, hv_synic_cleanup); if (ret < 0) goto err_alloc; @@ -1717,7 +1716,7 @@ static int __init hv_acpi_init(void) { int ret, t; - if (x86_hyper_type != X86_HYPER_MS_HYPERV) + if (!hv_is_hyperv_initialized()) return -ENODEV; init_completion(&probe_event); |