On Tue, Jul 06, 2021, Paolo Bonzini wrote: > On 03/07/21 00:05, isaku.yamahata@xxxxxxxxx wrote: > > From: Xiaoyao Li <xiaoyao.li@xxxxxxxxx> > > > > Introduce a per-vm variable initial_tsc_khz to hold the default tsc_khz > > for kvm_arch_vcpu_create(). > > > > This field is going to be used by TDX since TSC frequency for TD guest > > is configured at TD VM initialization phase. > > > > Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx> > > Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx> > > --- > > arch/x86/include/asm/kvm_host.h | 1 + > > arch/x86/kvm/x86.c | 3 ++- > > 2 files changed, 3 insertions(+), 1 deletion(-) > > So this means disabling TSC frequency scaling on TDX. Would it make sense > to delay VM creation to a separate ioctl, similar to KVM_ARM_VCPU_FINALIZE > (KVM_VM_FINALIZE)? There's an equivalent of that in the next mega-patch, the KVM_TDX_INIT_VM sub-ioctl of KVM_MEMORY_ENCRYPT_OP. The TSC frequency for the guest gets provided at that time.
