[PATCH] target/i386/kvm: fix kvmclock_current_nsec: Assertion `time.tsc_timestamp <= migration_tsc' failed

[Ray Zhang <zhanglei002@gmail.com>]

New KVM_CLOCK flags were added in the kernel.(c68dc1b577eabd5605c6c7c08f3e07ae18d30d5d)
```
+ #define KVM_CLOCK_VALID_FLAGS						\
+	(KVM_CLOCK_TSC_STABLE | KVM_CLOCK_REALTIME | KVM_CLOCK_HOST_TSC)

	case KVM_CAP_ADJUST_CLOCK:
-		r = KVM_CLOCK_TSC_STABLE;
+		r = KVM_CLOCK_VALID_FLAGS;
```

kvm_has_adjust_clock_stable needs to handle additional flags,
so that s->clock_is_reliable can be true and kvmclock_current_nsec doesn't need to be called.

Signed-off-by: Ray Zhang <zhanglei002@gmail.com>
---
 target/i386/kvm/kvm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index a1fd1f5379..9eeee91c2f 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -157,7 +157,7 @@ bool kvm_has_adjust_clock_stable(void)
 {
     int ret = kvm_check_extension(kvm_state, KVM_CAP_ADJUST_CLOCK);
 
-    return (ret == KVM_CLOCK_TSC_STABLE);
+    return (ret & KVM_CLOCK_TSC_STABLE);
 }
 
 bool kvm_has_adjust_clock(void)
-- 
2.37.2