Messages in this thread | | | Subject | Re: [RFC v2-fix-v2 2/2] x86/tdx: Ignore WBINVD instruction for TDX guest | From | Dave Hansen <> | Date | Mon, 24 May 2021 21:32:15 -0700 |
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On 5/24/21 7:13 PM, Andi Kleen wrote: > I don't see any point of all of this. We really just want to be the same > as KVM. Not get into the business of patching a bazillion sub systems > that cannot be used in TDX anyways.
Andi, there's a fundamental difference between KVM the hypervisor and a TDX guest: KVM the hypervisor runs unknown guests, and lots of them.
TD guest support as a whole has to handle one thing: running *one* Linux kernel. Further, the guest support shares a source tree with that kernel. TD guest support doesn't have to run random binaries for which there is no source. All of the source is *RIGHT* *THERE*.
The only reason TD guest support would have to fall back to KVM's dirty tricks is a desire to treat the rest of the kernel like a black box. KVM frankly has no other choice. TD guest support has all the choices in the world.
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