On 2019/10/23 5:03, Sean Christopherson wrote:
On Tue, Oct 22, 2019 at 08:46:46PM +0800, Zhenzhong Duan wrote:
Hi Vitaly,
On 2019/10/22 19:36, Vitaly Kuznetsov wrote:
Zhenzhong Duan writes:
...snip
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 249f14a..3945aa5 100644
On Tue, Oct 22, 2019 at 08:46:46PM +0800, Zhenzhong Duan wrote:
> Hi Vitaly,
>
> On 2019/10/22 19:36, Vitaly Kuznetsov wrote:
>
> >Zhenzhong Duan writes:
> >
> ...snip
>
> >>diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
> >>index 249f14a..3945aa5 100644
> >>--- a/arch/x86/kernel/kv
Zhenzhong Duan writes:
> Hi Vitaly,
>
> On 2019/10/22 19:36, Vitaly Kuznetsov wrote:
>
>> Zhenzhong Duan writes:
>>
> ...snip
>
>>> diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
>>> index 249f14a..3945aa5 100644
>>> --- a/arch/x86/kernel/kvm.c
>>> +++ b/arch/x86/kernel/kvm.c
>>> @@
Hi Vitaly,
On 2019/10/22 19:36, Vitaly Kuznetsov wrote:
Zhenzhong Duan writes:
...snip
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 249f14a..3945aa5 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -825,18 +825,36 @@ __visible bool __kvm_vcpu_is_preempt
Zhenzhong Duan writes:
> There are cases where a guest tries to switch spinlocks to bare metal
> behavior (e.g. by setting "xen_nopvspin" on XEN platform and
> "hv_nopvspin" on HYPER_V).
>
> That feature is missed on KVM, add a new parameter "nopvspin" to disable
> PV spinlocks for KVM guest.
>
>
There are cases where a guest tries to switch spinlocks to bare metal
behavior (e.g. by setting "xen_nopvspin" on XEN platform and
"hv_nopvspin" on HYPER_V).
That feature is missed on KVM, add a new parameter "nopvspin" to disable
PV spinlocks for KVM guest.
The new 'nopvspin' parameter will also
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