linux-kernel - Re: [RFC PATCH 0/6] KVM: guest memory: Misc enhacnement

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Message-ID: <CAGtprH8O6dsjjNrMzLPmRio0ZDLe6M3U06HD0oNX3NN9FeWQfg@mail.gmail.com>
Date:   Mon, 19 Jun 2023 12:11:50 -0700
From:   Vishal Annapurve <vannapurve@...gle.com>
To:     isaku.yamahata@...el.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        isaku.yamahata@...il.com, Paolo Bonzini <pbonzini@...hat.com>,
        erdemaktas@...gle.com, Sean Christopherson <seanjc@...gle.com>,
        Sagi Shahar <sagis@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Kai Huang <kai.huang@...el.com>,
        Zhi Wang <zhi.wang.linux@...il.com>, chen.bo@...el.com,
        linux-coco@...ts.linux.dev,
        Chao Peng <chao.p.peng@...ux.intel.com>,
        Ackerley Tng <ackerleytng@...gle.com>,
        Michael Roth <michael.roth@....com>
Subject: Re: [RFC PATCH 0/6] KVM: guest memory: Misc enhacnement

On Thu, Jun 15, 2023 at 1:12 PM <isaku.yamahata@...el.com> wrote:
> ...
>
> * VM type: Now we have KVM_X86_PROTECTED_VM. How do we proceed?
>   - Keep KVM_X86_PROTECTED_VM for its use. Introduce KVM_X86_TDX_VM
>   - Use KVM_X86_PROTECTED_VM for TDX. (If necessary, introduce another type in
>     the future)
>   - any other way?

There are selftests posted[1] in context of this work, which rely on
KVM_X86_PROTECTED_VM being just the software-only psuedo-confidential
VMs. In future there might be more work to expand this usecase to
full-scale VMs. So it would be better to treat protected VMs as a
separate type which can be used on any platform without the need of
enabling TDX/SEV functionality.

TDX VM type can possibly serve as a specialized type of protected VM
with additional arch specific capabilities enabled.

[1] - https://github.com/sean-jc/linux/commits/x86/kvm_gmem_solo