On Tue, Oct 29, 2024 at 09:34:58AM +0530, Nikunj A. Dadhania wrote: > Hello Marcelo > > On 10/28/2024 10:12 PM, Marcelo Tosatti wrote: > > On Sun, Oct 27, 2024 at 10:06:17PM +0800, Xiaoyao Li wrote: > >> On 10/26/2024 12:24 AM, Marcelo Tosatti wrote: > >>> On Mon, Oct 14, 2024 at 08:17:19PM +0530, Nikunj A. Dadhania wrote: > >>>> Hi Isaku, > >>>> > >>>> On 10/12/2024 1:25 PM, Isaku Yamahata wrote: > >>>>> Choose the first one. With this patch series, SEV-SNP secure TSC can be > >>>>> supported. > >>>> > >>>> I am not sure how will this help SNP Secure TSC, as the GUEST_TSC_OFFSET and > >>>> GUEST_TSC_SCALE are only available to the guest. > >>> > >>> Nikunj, > >>> > >>> FYI: > >>> > >>> SEV-SNP processors (at least the one below) do not seem affected by this problem. > >> > >> Did you apply Secure TSC patches of (guest kernel, KVM and QEMU) manualy? > >> because none of them are merged. > > > > Yes. cyclictest latency, on a system configured with tuned > > realtime-virtual-host/realtime-virtual-guest tuned profiles, > > goes from 30us to 50us. > > Would you be ok if I include your Tested-by in the next version of my Secure TSC patches? > > https://lore.kernel.org/lkml/20241028053431.3439593-1-nikunj@xxxxxxx/ Please don't, haven't tested specifically the patches above. > >> Otherwise, I think SNP guest is still using > >> KVM emulated TSC. > > > > Not in the case the test was made. > > > > Regards, > Nikunj > >
