Hi Vitaly, Sean and David,
On 10/19/23 08:40, Sean Christopherson wrote:
> On Thu, Oct 19, 2023, Vitaly Kuznetsov wrote:
>> Dongli Zhang writes:
>>
>>> As mentioned in the linux kernel development document, "sched_clock() is
>>> used for scheduling and timestamping". While there is a default
On Thu, Oct 19, 2023, David Woodhouse wrote:
> On Thu, 2023-10-19 at 08:40 -0700, Sean Christopherson wrote:
> > > If for some 'historical reasons' we can't revoke features we can always
> > > introduce a new PV feature bit saying that TSC is preferred.
>
> Don't we already have one? It's the
On 10/16/2023 4:49 AM, Alex Ionescu wrote:
Hi,
In arch/x86/include/asm/hyperv-tlfs.h, the following definition at
line 786 (in Linus' tree), I believe to be incorrect.
struct hv_enable_vp_vtl {
u64partition_id;
u32vp_index;
union hv_input_vtl
> --- a/arch/x86/hyperv/ivm.c
> +++ b/arch/x86/hyperv/ivm.c
> @@ -450,6 +450,16 @@ static bool hv_is_private_mmio(u64 addr)
> return false;
> }
>
> +static void hv_print_mem_enc_feature_info(void)
> +{
> + enum hv_isolation_type type = hv_get_isolation_type();
> +
> + if (type ==
On Thu, 2023-10-19 at 08:40 -0700, Sean Christopherson wrote:
>
> > Normally, it should be up to the hypervisor to tell the guest which
> > clock to use, i.e. if TSC is reliable or not. Let me put my question
> > this way: if TSC on the particular host is good for everything, why
> > does the
On Thu, Oct 19, 2023, Vitaly Kuznetsov wrote:
> Dongli Zhang writes:
>
> > As mentioned in the linux kernel development document, "sched_clock() is
> > used for scheduling and timestamping". While there is a default native
> > implementation, many paravirtualizations have their own
Dongli Zhang writes:
> As mentioned in the linux kernel development document, "sched_clock() is
> used for scheduling and timestamping". While there is a default native
> implementation, many paravirtualizations have their own implementations.
>
> About KVM, it uses kvm_sched_clock_read() and
Hyper-V provides two modes for running a TDX/SNP VM:
1) In TD Partitioning mode (TDX) or vTOM mode (SNP) with a paravisor;
2) In "fully enlightened" mode with the normal TDX shared bit or SNP C-bit
control over page encryption, and no paravisor.
In the first mode (i.e. paravisor mode), the
