linux-kernel - Re: [PATCH v18 071/121] KVM: TDX: restore user ret MSRs

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Date: Mon, 26 Feb 2024 11:24:39 -0800
From: Isaku Yamahata <isaku.yamahata@...ux.intel.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 v18 071/121] KVM: TDX: restore user ret MSRs

On Tue, Feb 20, 2024 at 05:14:02PM +0800,
Binbin Wu <binbin.wu@...ux.intel.com> wrote:

> > @@ -1936,6 +1959,26 @@ int __init tdx_hardware_setup(struct kvm_x86_ops *x86_ops)
> >   		return -EINVAL;
> >   	}
> > +	for (i = 0; i < ARRAY_SIZE(tdx_uret_msrs); i++) {
> > +		/*
> > +		 * Here it checks if MSRs (tdx_uret_msrs) can be saved/restored
> > +		 * before returning to user space.
> > +		 *
> > +		 * this_cpu_ptr(user_return_msrs)->registered isn't checked
> > +		 * because the registration is done at vcpu runtime by
> > +		 * kvm_set_user_return_msr().
> 
> For tdx, it's done by kvm_user_return_update_cache(), right?

Right, fixed the comment.
-- 
Isaku Yamahata <isaku.yamahata@...ux.intel.com>