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/ >> Otherwise, I think SNP guest is still using >> KVM emulated TSC. > > Not in the case the test was made. > Regards, Nikunj
