On 7/6/2024 9:23 AM, Paolo Bonzini wrote: > > > Il sab 6 lug 2024, 17:57 Li, Xin3 <xin3...@intel.com > <mailto:xin3...@intel.com>> ha scritto: > > >> The bits in the secondary vmexit controls are not supported, and > in general the same > >> is true for the secondary vmexit case. I think it's better to > not include the vmx-entry- > >> load-fred bit either, and only do the vmxcap changes. > > > Right, we don't need it at all. > > Hi Paolo, > > We actually do need the following change for nested FRED guests to boot: > > diff --git a/target/i386/cpu.c b/target/i386/cpu.c > index 227ee1c759..dcf914a7ec 100644 > --- a/target/i386/cpu.c > +++ b/target/i386/cpu.c > @@ -1285,7 +1285,7 @@ FeatureWordInfo > feature_word_info[FEATURE_WORDS] = { > NULL, "vmx-entry-ia32e-mode", NULL, NULL, > NULL, "vmx-entry-load-perf-global-ctrl", > "vmx-entry-load-pat", "vmx-entry-load-efer", > "vmx-entry-load-bndcfgs", NULL, > "vmx-entry-load-rtit-ctl", NULL, > - NULL, NULL, "vmx-entry-load-pkrs", NULL, > + NULL, NULL, "vmx-entry-load-pkrs", "vmx-entry-load-fred", > NULL, NULL, NULL, NULL, > NULL, NULL, NULL, NULL, > }, > > Or do you think it's not the root cause? > > > The patch is correct but is FRED supported in nested VMX? Or is it with > not yet merged patches?
The FRED KVM patchset has support for nested FRED, but not merged yet. It's here: https://lore.kernel.org/kvm/20240207172646.3981-1-xin3...@intel.com/ Thanks! Xin
