Drivers: hv: vmbus: Move the check for hypercall page setup
As part of the effort to separate out architecture specific code, move the
check for detecting if the hypercall page is setup.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index ce5fc73..d289bc2 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -235,3 +235,18 @@
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 64e682d..c843ef6 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -115,5 +115,6 @@
#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 9985a34..d28a873 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -49,7 +49,6 @@
*/
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 @@
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;