diff options
| -rw-r--r-- | arch/x86/hyperv/hv_init.c | 15 | ||||
| -rw-r--r-- | arch/x86/include/asm/mshyperv.h | 1 | ||||
| -rw-r--r-- | drivers/hv/hv.c | 7 |
3 files changed, 17 insertions, 6 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index ce5fc7394814..d289bc29d282 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -235,3 +235,18 @@ void hyperv_report_panic(struct pt_regs *regs) wrmsrl(HV_X64_MSR_CRASH_CTL, HV_CRASH_CTL_CRASH_NOTIFY); } EXPORT_SYMBOL_GPL(hyperv_report_panic); + +bool hv_is_hypercall_page_setup(void) +{ + union hv_x64_msr_hypercall_contents hypercall_msr; + + /* Check if 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; +} +EXPORT_SYMBOL_GPL(hv_is_hypercall_page_setup); diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 64e682d88684..c843ef64defe 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -115,5 +115,6 @@ void hv_remove_crash_handler(void); #if IS_ENABLED(CONFIG_HYPERV) void hyperv_init(void); void hyperv_report_panic(struct pt_regs *regs); +bool hv_is_hypercall_page_setup(void); #endif #endif diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 9985a347ed03..d28a8731baa0 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -49,7 +49,6 @@ struct hv_context hv_context = { */ int hv_init(void) { - union hv_x64_msr_hypercall_contents hypercall_msr; memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS); memset(hv_context.synic_message_page, 0, @@ -65,11 +64,7 @@ int hv_init(void) memset(hv_context.clk_evt, 0, sizeof(void *) * NR_CPUS); - /* See if the hypercall page is already set */ - hypercall_msr.as_uint64 = 0; - rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); - - if (!hypercall_msr.enable) + if (!hv_is_hypercall_page_setup()) return -ENOTSUPP; return 0; |