linux-kernel - Re: [RFC PATCH v2 12/18] KVM: TDX: Bug the VM if extended the initial measurement fails

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Message-ID: <aLI1NntrAXP0CxPz@google.com>
Date: Fri, 29 Aug 2025 16:18:14 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Rick P Edgecombe <rick.p.edgecombe@...el.com>
Cc: Kai Huang <kai.huang@...el.com>, "ackerleytng@...gle.com" <ackerleytng@...gle.com>, 
	Vishal Annapurve <vannapurve@...gle.com>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Yan Y Zhao <yan.y.zhao@...el.com>, 
	Ira Weiny <ira.weiny@...el.com>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, 
	"michael.roth@....com" <michael.roth@....com>, "pbonzini@...hat.com" <pbonzini@...hat.com>
Subject: Re: [RFC PATCH v2 12/18] KVM: TDX: Bug the VM if extended the initial
 measurement fails

On Fri, Aug 29, 2025, Rick P Edgecombe wrote:
> On Fri, 2025-08-29 at 15:39 -0700, Rick Edgecombe wrote:
> > Ok, the direction seem clear. The patch has an issue, need to debug.
> 
> Just this:
> 
> diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
> index c595d9cb6dcd..e99d07611393 100644
> --- a/arch/x86/kvm/vmx/tdx.c
> +++ b/arch/x86/kvm/vmx/tdx.c
> @@ -2809,7 +2809,7 @@ static int tdx_td_finalize(struct kvm *kvm, struct
> kvm_tdx_cmd *cmd)
>  
>  static int tdx_get_cmd(void __user *argp, struct kvm_tdx_cmd *cmd)
>  {
> -       if (copy_from_user(cmd, argp, sizeof(cmd)))
> +       if (copy_from_user(cmd, argp, sizeof(*cmd)))

LOL, it's always some mundane detail!

>                 return -EFAULT;
>  
>         if (cmd->hw_error)
>