linux-kernel - Re: [PATCH 07/18] KVM: TDX: Implement callbacks for MSR operations

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Message-ID: <34ed02a6aedc7dcb35df9ce639e427e4d1a61f72.camel@intel.com>
Date: Wed, 15 Jan 2025 11:26:42 +0000
From: "Huang, Kai" <kai.huang@...el.com>
To: "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "pbonzini@...hat.com"
	<pbonzini@...hat.com>, "seanjc@...gle.com" <seanjc@...gle.com>,
	"binbin.wu@...ux.intel.com" <binbin.wu@...ux.intel.com>
CC: "Gao, Chao" <chao.gao@...el.com>, "Edgecombe, Rick P"
	<rick.p.edgecombe@...el.com>, "Li, Xiaoyao" <xiaoyao.li@...el.com>, "Chatre,
 Reinette" <reinette.chatre@...el.com>, "Zhao, Yan Y" <yan.y.zhao@...el.com>,
	"Hunter, Adrian" <adrian.hunter@...el.com>, "tony.lindgren@...ux.intel.com"
	<tony.lindgren@...ux.intel.com>, "Yamahata, Isaku"
	<isaku.yamahata@...el.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/18] KVM: TDX: Implement callbacks for MSR operations

On Tue, 2024-12-10 at 08:49 +0800, Binbin Wu wrote:
> From: Isaku Yamahata <isaku.yamahata@...el.com>
> 
> Add functions to implement MSR related callbacks, .set_msr(), .get_msr(),
> and .has_emulated_msr(), for preparation of handling hypercalls from TDX
> guest for para-virtualized RDMSR and WRMSR.  Ignore KVM_REQ_MSR_FILTER_CHANGED
> for TDX.
> 
> There are three classes of MSRs virtualization for TDX.
			     ^
			     MSR

> - Non-configurable: TDX module directly virtualizes it. VMM can't configure
>   it, the value set by KVM_SET_MSRS is ignored.
> - Configurable: TDX module directly virtualizes it. VMM can configure at the
>   VM creation time.  The value set by KVM_SET_MSRS is used.
> - #VE case: TDX guest would issue TDG.VP.VMCALL<INSTRUCTION.{WRMSR,RDMSR}>
>   and VMM handles the MSR hypercall. The value set by KVM_SET_MSRS is used.
> 
> For the MSRs belonging to the #VE case, the TDX module injects #VE to the
> TDX guest upon RDMSR or WRMSR.  The exact list of such MSRs are defined in
							      ^
							      is
> TDX Module ABI Spec.
>