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Re: [PATCH RFC] i386/kvm: fix enlightened VMCS with fine-grained VMX fea
Re: [PATCH RFC] i386/kvm: fix enlightened VMCS with fine-grained VMX feature enablement
Tue, 7 Jan 2020 13:25:27 +0100
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On 07/01/20 13:08, Vitaly Kuznetsov wrote:
> Honestly I forgot the story why we filtered out these features upon
> eVMCS enablement in KVM. As there are no corresponding eVMCS fields,
> there's no way a guest can actually use them.
Well, mostly because we mimicked what Hyper-V was doing I guess.
> I'm going to check that nothing breaks if we remove the filter. I'll go
> and test Hyper-V 2016 and 2019.
KVM would break, right? But we can mark that patch as stable material.
>> If so, we should teach guest-side KVM about this, not QEMU.
> This is not required when enabling eVMCS on a genuine Hyper-V because it
> correctly filters out unsupported features, however, to not break
> KVM-on-KVM-using-eVMCS case we'll have to move the filter from host to