linux-kernel - Re: [PATCH v19 079/130] KVM: TDX: vcpu_run: save/restore host state(host kernel gs)

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Message-ID: <d83e5fea-492e-4bd8-ba75-113bfd0c6643@linux.intel.com>
Date: Thu, 18 Apr 2024 15:57:11 +0800
From: Binbin Wu <binbin.wu@...ux.intel.com>
To: Isaku Yamahata <isaku.yamahata@...el.com>
Cc: 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 079/130] KVM: TDX: vcpu_run: save/restore host
 state(host kernel gs)



On 4/13/2024 4:17 AM, Isaku Yamahata wrote:
>>> +void tdx_prepare_switch_to_guest(struct kvm_vcpu *vcpu)
>> Just like vmx_prepare_switch_to_host(), the input can be "struct vcpu_tdx
>> *", since vcpu is not used inside the function.
>> And the callsites just use "to_tdx(vcpu)"
>>
>>> +{
>>> +	struct vcpu_tdx *tdx = to_tdx(vcpu);
>> Then, this can be dropped.
> prepare_switch_to_guest() is used for kvm_x86_ops.prepare_switch_to_guest().
> kvm_x86_ops consistently takes struct kvm_vcpu.

Oh yes, it's not suitable for tdx_prepare_switch_to_guest().
Still, it can be for tdx_prepare_switch_to_host().