linux-kernel - Re: [PATCH v3 0/7] KVM: Guest Memory Pre-Population API

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Date: Thu, 18 Apr 2024 00:33:32 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "pbonzini@...hat.com"
	<pbonzini@...hat.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: "Li, Xiaoyao" <xiaoyao.li@...el.com>, "seanjc@...gle.com"
	<seanjc@...gle.com>, "binbin.wu@...ux.intel.com" <binbin.wu@...ux.intel.com>,
	"Yamahata, Isaku" <isaku.yamahata@...el.com>
Subject: Re: [PATCH v3 0/7] KVM: Guest Memory Pre-Population API

On Thu, 2024-04-18 at 02:31 +0200, Paolo Bonzini wrote:
> > The TDX patches build on this, with the vendor callback looking like:
> > 
> > "
> > int tdx_pre_mmu_map_page(struct kvm_vcpu *vcpu,
> >                          struct kvm_map_memory *mapping,
> >                          u64 *error_code)
> > {
> >         struct kvm_tdx *kvm_tdx = to_kvm_tdx(vcpu->kvm);
> >         struct kvm *kvm = vcpu->kvm;
> > 
> >         if (!to_tdx(vcpu)->initialized)
> >                 return -EINVAL;
> > 
> >         /* Shared-EPT case */
> >         if (!(kvm_is_private_gpa(kvm, mapping->base_address)))
> >                 return 0;
> > 
> >         /* Once TD is finalized, the initial guest memory is fixed. */
> >         if (is_td_finalized(kvm_tdx))
> >                 return -EINVAL;
> 
> This is wrong, KVM_MAP_MEMORY should be idempotent. But anyway, you can post
> what you have on to of kvm-coco-queue (i.e., adding the hook in your patches)
> and we will sort it out a piece at a time.

Hmm, I see your point.