On 21/01/2025 17:16, David Woodhouse wrote:
On Tue, 2025-01-21 at 15:59 +0000, Paul Durrant wrote:
On 21/01/2025 15:44, Sean Christopherson wrote:
[snip]
I think it's ok to keep the Hyper-V TSC page in this case. It's not that the Xen
PV clock is truly unstable, it's that some guests get tripped up by the STABLE
flag. A guest that can't handle the STABLE flag has bigger problems than the
existence of a completely unrelated clock that is implied to be stable.
Agreed.
I don't know if anyone combines Xen and Hyper-V emulation capabilities for
the same guest on KVM though.)
That someone would have to be quite "brave" :-D
Maybe :-)
Xen itself does offer some Hyper-V enlightenments, and we might
reasonably expect KVM-based hypervisors to offer the same. We
explicitly do account for the KVM CPUID leaves moving up to let the
Hyper-V ones exist.
I don't recall if Xen's Hyper-V support includes the TSC page though.
It does :-)
