linux-kernel - Re: [RFC PATCH v5 010/104] KVM: TDX: Make TDX VM type supported

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 16 Mar 2022 10:47:31 +1300
From:   Kai Huang <kai.huang@...el.com>
To:     Isaku Yamahata <isaku.yamahata@...il.com>
Cc:     isaku.yamahata@...el.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Jim Mattson <jmattson@...gle.com>, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [RFC PATCH v5 010/104] KVM: TDX: Make TDX VM type supported

On Tue, 2022-03-15 at 14:03 -0700, Isaku Yamahata wrote:
> On Mon, Mar 14, 2022 at 12:08:59PM +1300,
> Kai Huang <kai.huang@...el.com> wrote:
> 
> > On Fri, 2022-03-04 at 11:48 -0800, isaku.yamahata@...el.com wrote:
> > > From: Isaku Yamahata <isaku.yamahata@...el.com>
> > > 
> > > As first step TDX VM support, return that TDX VM type supported to device
> > > model, e.g. qemu.  The callback to create guest TD is vm_init callback for
> > > KVM_CREATE_VM.  Add a place holder function and call a function to
> > > initialize TDX module on demand because in that callback VMX is enabled by
> > > hardware_enable callback (vmx_hardware_enable).
> > 
> > Should we put this patch at the end of series until all changes required to run
> > TD are introduced?  This patch essentially tells userspace KVM is ready to
> > support a TD but actually it's not ready.  And this might also cause bisect
> > issue I suppose?
> 
> The intention is that developers can exercise the new code step-by-step even if
> the TDX KVM isn't complete.

What is the purpose/value to allow developers to exercise the new code step-by-
step?  Userspace cannot create TD successfully anyway until all patches are
ready.

-- 
Thanks,
-Kai