On Tue, Nov 14, 2017 at 02:28:56PM +0800, Wanpeng Li wrote:
> > - have the TLB invalidate handler do something like:
> >
> >state = READ_ONCE(src->preempted);
> >if (!(state & KVM_VCPU_IPI_PENDING))
> >return;
> >
> >local_flush_tlb();
> >
> >do {
> >} while (!try_c
On Tue, Nov 14, 2017 at 02:10:16PM +0800, Wanpeng Li wrote:
> 2017-11-13 21:02 GMT+08:00 Peter Zijlstra :
> > That can be written like:
> >
> > do {
> > if (state & KVM_VCPU_PREEMPTED)
> > new_state = state | KVM_VCPU_SHOULD_FLUSH;
> >
2017-11-13 18:46 GMT+08:00 Peter Zijlstra :
> On Mon, Nov 13, 2017 at 04:26:57PM +0800, Wanpeng Li wrote:
>> 2017-11-13 16:04 GMT+08:00 Peter Zijlstra :
>
>> > So if at this point a vCPU gets preempted we'll still spin-wait for it,
>> > which is sub-optimal.
>> >
>> > I think we can come up with so
2017-11-13 21:02 GMT+08:00 Peter Zijlstra :
> On Mon, Nov 13, 2017 at 11:46:34AM +0100, Peter Zijlstra wrote:
>> On Mon, Nov 13, 2017 at 04:26:57PM +0800, Wanpeng Li wrote:
>> > 2017-11-13 16:04 GMT+08:00 Peter Zijlstra :
>>
>> > > So if at this point a vCPU gets preempted we'll still spin-wait for
On Mon, Nov 13, 2017 at 11:46:34AM +0100, Peter Zijlstra wrote:
> On Mon, Nov 13, 2017 at 04:26:57PM +0800, Wanpeng Li wrote:
> > 2017-11-13 16:04 GMT+08:00 Peter Zijlstra :
>
> > > So if at this point a vCPU gets preempted we'll still spin-wait for it,
> > > which is sub-optimal.
> > >
> > > I th
On Mon, Nov 13, 2017 at 04:26:57PM +0800, Wanpeng Li wrote:
> 2017-11-13 16:04 GMT+08:00 Peter Zijlstra :
> > So if at this point a vCPU gets preempted we'll still spin-wait for it,
> > which is sub-optimal.
> >
> > I think we can come up with something to get around that 'problem' if
> > indeed i
2017-11-13 16:04 GMT+08:00 Peter Zijlstra :
> On Sun, Nov 12, 2017 at 04:33:24PM -0800, Wanpeng Li wrote:
>> +static void kvm_flush_tlb_others(const struct cpumask *cpumask,
>> + const struct flush_tlb_info *info)
>> +{
>> + u8 state;
>> + int cpu;
>> + struct kvm_st
2017-11-13 15:59 GMT+08:00 Peter Zijlstra :
> On Sun, Nov 12, 2017 at 04:33:24PM -0800, Wanpeng Li wrote:
>> +static void kvm_flush_tlb_others(const struct cpumask *cpumask,
>> + const struct flush_tlb_info *info)
>> +{
>> + u8 state;
>> + int cpu;
>> + struct kvm_st
On Sun, Nov 12, 2017 at 04:33:24PM -0800, Wanpeng Li wrote:
> +static void kvm_flush_tlb_others(const struct cpumask *cpumask,
> + const struct flush_tlb_info *info)
> +{
> + u8 state;
> + int cpu;
> + struct kvm_steal_time *src;
> + struct cpumask *flushmask = t
On Sun, Nov 12, 2017 at 04:33:24PM -0800, Wanpeng Li wrote:
> +static void kvm_flush_tlb_others(const struct cpumask *cpumask,
> + const struct flush_tlb_info *info)
> +{
> + u8 state;
> + int cpu;
> + struct kvm_steal_time *src;
> + struct cpumask *flushmask = t
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