linux-kernel - Re: [PATCH 02/16] KVM: x86/mmu: Introduce a slot flag to zap only slot leafs on slot deletion

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Message-ID: <638acb8f-3cc1-4915-927d-a6e90ce8ecb7@intel.com>
Date: Thu, 16 May 2024 09:12:19 +0800
From: Xiaoyao Li <xiaoyao.li@...el.com>
To: Sean Christopherson <seanjc@...gle.com>, Kai Huang <kai.huang@...el.com>
Cc: Rick P Edgecombe <rick.p.edgecombe@...el.com>,
 "dmatlack@...gle.com" <dmatlack@...gle.com>,
 "sagis@...gle.com" <sagis@...gle.com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 Yan Y Zhao <yan.y.zhao@...el.com>, Erdem Aktas <erdemaktas@...gle.com>,
 "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
 "pbonzini@...hat.com" <pbonzini@...hat.com>,
 "isaku.yamahata@...il.com" <isaku.yamahata@...il.com>
Subject: Re: [PATCH 02/16] KVM: x86/mmu: Introduce a slot flag to zap only
 slot leafs on slot deletion

On 5/16/2024 7:20 AM, Sean Christopherson wrote:
>> But again, I think it's just too overkill for TDX.  We can just set the
>> ZAP_LEAF_ONLY flag for the slot when it is created in KVM.
> Ya, I'm convinced that adding uAPI is overkill at this point.

+1.

Making it configurable by userspace needs justification common enough.

If it's just for TDX specific and mandatory for TDX, just make it KVM 
internal thing for TDX.