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x86: kvm: introduce periodic global clock updates 

commit 0061d53daf introduced a mechanism to execute a global clock
update for a vm. We can apply this periodically in order to propagate
host NTP corrections. Also, if all vcpus of a vm are pinned, then
without an additional trigger, no guest NTP corrections can propagate
either, as the current trigger is only vcpu cpu migration.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Andrew Jones 2014-02-28 12:52:55 +01:00 committed by Paolo Bonzini
parent 7e44e4495a
commit 332967a3ea
2 changed files with 21 additions and 0 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -599,6 +599,7 @@ struct kvm_arch {
u64 master_kernel_ns;
cycle_t master_cycle_now;
struct delayed_work kvmclock_update_work;
struct delayed_work kvmclock_sync_work;
struct kvm_xen_hvm_config xen_hvm_config;

20
arch/x86/kvm/x86.c
View File

@ -1660,6 +1660,20 @@ static void kvm_gen_kvmclock_update(struct kvm_vcpu *v)
KVMCLOCK_UPDATE_DELAY);
}
#define KVMCLOCK_SYNC_PERIOD (300 * HZ)
static void kvmclock_sync_fn(struct work_struct *work)
{
struct delayed_work *dwork = to_delayed_work(work);
struct kvm_arch *ka = container_of(dwork, struct kvm_arch,
kvmclock_sync_work);
struct kvm *kvm = container_of(ka, struct kvm, arch);
schedule_delayed_work(&kvm->arch.kvmclock_update_work, 0);
schedule_delayed_work(&kvm->arch.kvmclock_sync_work,
KVMCLOCK_SYNC_PERIOD);
}
static bool msr_mtrr_valid(unsigned msr)
{
switch (msr) {
@ -6736,6 +6750,7 @@ int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
{
int r;
struct msr_data msr;
struct kvm *kvm = vcpu->kvm;
r = vcpu_load(vcpu);
if (r)
@ -6746,6 +6761,9 @@ int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
kvm_write_tsc(vcpu, &msr);
vcpu_put(vcpu);
schedule_delayed_work(&kvm->arch.kvmclock_sync_work,
KVMCLOCK_SYNC_PERIOD);
return r;
}
@ -7039,6 +7057,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
pvclock_update_vm_gtod_copy(kvm);
INIT_DELAYED_WORK(&kvm->arch.kvmclock_update_work, kvmclock_update_fn);
INIT_DELAYED_WORK(&kvm->arch.kvmclock_sync_work, kvmclock_sync_fn);
return 0;
}
@ -7077,6 +7096,7 @@ static void kvm_free_vcpus(struct kvm *kvm)
void kvm_arch_sync_events(struct kvm *kvm)
{
cancel_delayed_work_sync(&kvm->arch.kvmclock_sync_work);
cancel_delayed_work_sync(&kvm->arch.kvmclock_update_work);
kvm_free_all_assigned_devices(kvm);
kvm_free_pit(kvm);