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Message-ID: <9c7d99469179340eeecabaf3e9c414fc98900626.camel@intel.com>
Subject: Re: [PATCH v8 2/5] x86/tdx: Add TDX Guest event notify interrupt
 support
From:   Kai Huang <kai.huang@intel.com>
To:     "Yao, Jiewen" <jiewen.yao@intel.com>,
        "Nakajima, Jun" <jun.nakajima@intel.com>,
        Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "x86@kernel.org" <x86@kernel.org>,
        "H . Peter Anvin" <hpa@zytor.com>,
        "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
        "Luck, Tony" <tony.luck@intel.com>,
        Andi Kleen <ak@linux.intel.com>,
        Wander Lairson Costa <wander@redhat.com>,
        Isaku Yamahata <isaku.yamahata@gmail.com>,
        "marcelo.cerri@canonical.com" <marcelo.cerri@canonical.com>,
        "tim.gardner@canonical.com" <tim.gardner@canonical.com>,
        "khalid.elmously@canonical.com" <khalid.elmously@canonical.com>,
        "Cox, Philip" <philip.cox@canonical.com>,
        LKML <linux-kernel@vger.kernel.org>
Date:   Mon, 27 Jun 2022 23:21:00 +1200
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References: <20220609025220.2615197-1-sathyanarayanan.kuppuswamy@linux.intel.com>
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         <efb2cdab-289b-8757-fe5e-5348519b0474@linux.intel.com>
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On Sat, 2022-06-25 at 15:35 +1200, Yao, Jiewen wrote:
> Thank you, Jun.
>=20
> Yes. I confirmed that we will include below change to GHCI.next spec.
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> 3.5 TDG.VP.VMCALL<SetupEventNotifyInterrupt>
>=20
> From: "The host VMM should use SEAMCALL [TDWRVPS] leaf to inject an inter=
rupt at the requested-interrupt vector into the TD via the posted-interrupt=
 descriptor. "
>=20
> To: "The host VMM should use SEAMCALL [TDWRVPS] leaf to inject an interru=
pt at the requested-interrupt vector into the TD VCPU that executed TDG.VP.=
VMCALL <SetupEventNotifyInterrupt> via the posted-interrupt descriptor. "
>=20

Hi Sathy,

With this change, I don't think we should use system vector anymore.  Inste=
ad,
we just need one non-migratable IRQ which has a fixed vector on a fixed cpu=
.

--=20
Thanks,
-Kai