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authorK. Y. Srinivasan <kys@microsoft.com>2017-01-19 21:51:49 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-20 16:48:03 +0300
commit73638cddaad861a5ebb2b119d8b318d4bded8f8d (patch)
treee9d9d003f6b14b8fd7d29b4e99f2aa174659bd50 /arch/x86/hyperv
parentd058fa7e98ff01a4b4750a2210fc19906db3cbe1 (diff)
downloadlinux-73638cddaad861a5ebb2b119d8b318d4bded8f8d.tar.xz
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>
Diffstat (limited to 'arch/x86/hyperv')
-rw-r--r--arch/x86/hyperv/hv_init.c15
1 files changed, 15 insertions, 0 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);