The offset to add to the hosts monotonic time, kvmclock_offset, is
calculated against the monotonic time at KVM_SET_CLOCK ioctl time.
Request a master clock update at this time, to reduce a potentially
unbounded difference between the values of the masterclock and
the clock value used to calculate kvmclock_offset.
Signed-off-by: Marcelo Tosatti <mtosa...@redhat.com>
Index: linux-2.6-kvmclock-fixes/arch/x86/kvm/x86.c
===================================================================
--- linux-2.6-kvmclock-fixes.orig/arch/x86/kvm/x86.c
+++ linux-2.6-kvmclock-fixes/arch/x86/kvm/x86.c
@@ -3806,6 +3806,7 @@ long kvm_arch_vm_ioctl(struct file *filp
delta = user_ns.clock - now_ns;
local_irq_enable();
kvm->arch.kvmclock_offset = delta;
+ kvm_gen_update_masterclock(kvm);
break;
}
case KVM_GET_CLOCK: {
--
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