We need to write the wall clock MSR every time we use it, to ensure we
get the updated value. This allows the guest OSv to track the time of
the host correctly.
Signed-off-by: Rick Payne <ri...@rossfell.co.uk>
---
drivers/kvmclock.cc | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/kvmclock.cc b/drivers/kvmclock.cc
index 68389dfb..2e182954 100644
--- a/drivers/kvmclock.cc
+++ b/drivers/kvmclock.cc
@@ -50,11 +50,8 @@ static u8 get_pvclock_flags()
kvmclock::kvmclock()
: _pvclock(get_pvclock_flags())
{
- auto wall_time_msr = (_new_kvmclock_msrs) ?
- msr::KVM_WALL_CLOCK_NEW :
msr::KVM_WALL_CLOCK;
_wall = new pvclock_wall_clock;
memset(_wall, 0, sizeof(*_wall));
- processor::wrmsr(wall_time_msr, mmu::virt_to_phys(_wall));
}
void kvmclock::init_on_cpu()
@@ -79,6 +76,9 @@ bool kvmclock::probe()
u64 kvmclock::wall_clock_boot()
{
+ auto wall_time_msr = (_new_kvmclock_msrs) ?
+ msr::KVM_WALL_CLOCK_NEW :
msr::KVM_WALL_CLOCK;
+ processor::wrmsr(wall_time_msr, mmu::virt_to_phys(_wall));
return _pvclock.wall_clock_boot(_wall);
}
--
2.17.1
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