linux-kernel - Re: [RFC v2 14/32] x86/tdx: Handle port I/O

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Message-ID: <648fe68f-c521-dbba-4495-9a4d0498a3be@linux.intel.com>
Date:   Mon, 10 May 2021 17:56:57 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        Raj Ashok <ashok.raj@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v2 14/32] x86/tdx: Handle port I/O



On 5/10/21 4:34 PM, Dan Williams wrote:
>>> Surely there's an existing macro for this pattern? Would
>>> PUSH_AND_CLEAR_REGS + POP_REGS be suitable? Besides code sharing it
>>> would eliminate clearing of %r8.
>>
>> There used to be SAVE_ALL/SAVE_REGS, but they have been all removed in
>> some past refactorings.
> Not a huge deal, but at a minimum it seems a generic construct that
> deserves to be declared centrally rather than tdx-guest-port-io local.

I can define SAVE_ALL_REGS/RESTORE_ALL_REGS. Do you want to move it outside
TDX code? I don't know if there will be other users for it?



-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer