linux-kernel - Re: [PATCH v18 015/121] KVM: TDX: Retry SEAMCALL on the lack of entropy error

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Message-ID: <CABgObfbjKb0x+uO=LRLqU8CZ35L7Tgg9B1i0NUwNRG5aQK9ixA@mail.gmail.com>
Date: Mon, 12 Feb 2024 11:05:39 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: isaku.yamahata@...el.com
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	isaku.yamahata@...il.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
Subject: Re: [PATCH v18 015/121] KVM: TDX: Retry SEAMCALL on the lack of
 entropy error

On Tue, Jan 23, 2024 at 12:55 AM <isaku.yamahata@...el.com> wrote:
>
> From: Isaku Yamahata <isaku.yamahata@...el.com>
>
> Some SEAMCALL may return TDX_RND_NO_ENTROPY error when the entropy is
> lacking.  Retry SEAMCALL on the error following rdrand_long() to retry
> RDRAND_RETRY_LOOPS times.
>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>

This patch should not be needed anymore, just...

> +       /* Mimic the existing rdrand_long() to retry RDRAND_RETRY_LOOPS times. */
> +       retry = RDRAND_RETRY_LOOPS;
> +       do {
> +               /* As __seamcall_ret() overwrites out, init out on each loop. */
>                 *out = *in;
>                 ret = __seamcall_ret(op, out);
> -       } else
> -               ret = __seamcall(op, in);

.. use seamcall() and seamcall_ret() here instead of the "__" versions.

Paolo