linux-kernel - Re: [PATCH v8 2/5] x86/tdx: Add TDX Guest event notify interrupt support

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Message-ID: <bceec213-4756-474b-6b91-51266e86c25a@linux.intel.com>
Date:   Mon, 27 Jun 2022 07:56:29 -0700
From:   Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Kai Huang <kai.huang@...el.com>,
        "Yao, Jiewen" <jiewen.yao@...el.com>,
        "Nakajima, Jun" <jun.nakajima@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Wander Lairson Costa <wander@...hat.com>,
        Isaku Yamahata <isaku.yamahata@...il.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>,
        "tim.gardner@...onical.com" <tim.gardner@...onical.com>,
        "khalid.elmously@...onical.com" <khalid.elmously@...onical.com>,
        "Cox, Philip" <philip.cox@...onical.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 2/5] x86/tdx: Add TDX Guest event notify interrupt
 support



On 6/27/22 4:21 AM, Kai Huang wrote:
> On Sat, 2022-06-25 at 15:35 +1200, Yao, Jiewen wrote:
>> Thank you, Jun.
>>
>> Yes. I confirmed that we will include below change to GHCI.next spec.
>>
>> ================
>> 3.5 TDG.VP.VMCALL<SetupEventNotifyInterrupt>
>>
>> From: "The host VMM should use SEAMCALL [TDWRVPS] leaf to inject an interrupt at the requested-interrupt vector into the TD via the posted-interrupt descriptor. "
>>
>> To: "The host VMM should use SEAMCALL [TDWRVPS] leaf to inject an interrupt at the requested-interrupt vector into the TD VCPU that executed TDG.VP.VMCALL <SetupEventNotifyInterrupt> via the posted-interrupt descriptor. "
>>
> 
> Hi Sathy,
> 
> With this change, I don't think we should use system vector anymore.  Instead,
> we just need one non-migratable IRQ which has a fixed vector on a fixed cpu.
> 

Yes. I will try your suggestion and make necessary changes in next version.

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer