[PATCH v4 31/47] x86/vmware: NOP-ify save/restore hooks when using VMware's sched_clock

[Sean Christopherson]

NOP-ify the sched_clock save/restore hooks when using VMware's version of
sched_clock.  This will allow extending paravirt_set_sched_clock() to set
the save/restore hooks, without having to simultaneously change the
behavior of VMware guests.

Note, it's not at all obvious that it's safe/correct for VMware guests to
do nothing on suspend/resume, but that's a pre-existing problem.  Leave it
for a VMware expert to sort out.

Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
 arch/x86/kernel/cpu/vmware.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index 2d0624c66799..051ef89029a7 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -347,8 +347,11 @@ static void __init vmware_paravirt_ops_setup(void)
 
 	vmware_cyc2ns_setup();
 
-	if (vmw_sched_clock)
+	if (vmw_sched_clock) {
 		paravirt_set_sched_clock(vmware_sched_clock);
+		x86_platform.save_sched_clock_state = x86_init_noop;
+		x86_platform.restore_sched_clock_state = x86_init_noop;
+	}
 
 	if (vmware_is_stealclock_available()) {
 		has_steal_clock = true;
-- 
2.54.0.823.g6e5bcc1fc9-goog