linux-kernel - Re: [PATCH v3 03/21] x86/virt/tdx: Implement the SEAMCALL base function

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Message-ID: <dd9d6f7d-5cec-e6b7-2fa0-5bf1fdcb79b5@linux.intel.com>
Date:   Tue, 19 Apr 2022 07:07:50 -0700
From:   Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Kai Huang <kai.huang@...el.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     seanjc@...gle.com, pbonzini@...hat.com, dave.hansen@...el.com,
        len.brown@...el.com, tony.luck@...el.com,
        rafael.j.wysocki@...el.com, reinette.chatre@...el.com,
        dan.j.williams@...el.com, peterz@...radead.org, ak@...ux.intel.com,
        kirill.shutemov@...ux.intel.com, isaku.yamahata@...el.com
Subject: Re: [PATCH v3 03/21] x86/virt/tdx: Implement the SEAMCALL base
 function



On 4/5/22 9:49 PM, Kai Huang wrote:
> SEAMCALL leaf functions use an ABI different from the x86-64 system-v
> ABI.  Instead, they share the same ABI with the TDCALL leaf functions.

TDCALL is a new term for this patch set. Maybe add some detail about
it in ()?.

> %rax is used to carry both the SEAMCALL leaf function number (input) and
> the completion status code (output).  Additional GPRs (%rcx, %rdx,
> %r8->%r11) may be further used as both input and output operands in
> individual leaf functions.



-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer