linux-kernel - Re: [PATCH v19 098/130] KVM: TDX: Add a place holder to handle TDX VM exit

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Message-ID: <20240415225811.GU3039520@ls.amr.corp.intel.com>
Date: Mon, 15 Apr 2024 15:58:11 -0700
From: Isaku Yamahata <isaku.yamahata@...el.com>
To: Binbin Wu <binbin.wu@...ux.intel.com>
Cc: isaku.yamahata@...el.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, isaku.yamahata@...il.com,
	Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
	Sean Christopherson <seanjc@...gle.com>,
	Sagi Shahar <sagis@...gle.com>, Kai Huang <kai.huang@...el.com>,
	chen.bo@...el.com, hang.yuan@...el.com, tina.zhang@...el.com,
	isaku.yamahata@...ux.intel.com
Subject: Re: [PATCH v19 098/130] KVM: TDX: Add a place holder to handle TDX
 VM exit

On Tue, Apr 09, 2024 at 06:36:01PM +0800,
Binbin Wu <binbin.wu@...ux.intel.com> wrote:

> > +		return 1;
> > +
> > +	/*
> > +	 * TDH.VP.ENTRY
> 
> "TDH.VP.ENTRY" -> "TDH.VP.ENTER"
> 
> >   checks TD EPOCH which contend with TDH.MEM.TRACK and
> > +	 * vcpu TDH.VP.ENTER.
> Do you mean TDH.VP.ENTER on one vcpu can contend with TDH.MEM.TRACK and
> TDH.VP.ENTER on another vcpu?

Yes.  The caller of TDH.MEM.TRACK() must ensure that other vCPUS go through
inactive (not running vCPU) after TDH.MEM.TRACK().
-- 
Isaku Yamahata <isaku.yamahata@...el.com>