linux-kernel - Re: [PATCH v3 1/3] x86/tdx: Add TDX Guest event notify interrupt support

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Date:   Mon, 12 Jun 2023 12:49:19 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "corbet@....net" <corbet@....net>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "x86@...nel.org" <x86@...nel.org>,
        "mingo@...hat.com" <mingo@...hat.com>
CC:     "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "Yu, Guorui" <guorui.yu@...ux.alibaba.com>,
        "qinkun@...che.org" <qinkun@...che.org>,
        "wander@...hat.com" <wander@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "chongc@...gle.com" <chongc@...gle.com>,
        "Aktas, Erdem" <erdemaktas@...gle.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "dionnaglaze@...gle.com" <dionnaglaze@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "Du, Fan" <fan.du@...el.com>
Subject: Re: [PATCH v3 1/3] x86/tdx: Add TDX Guest event notify interrupt
 support

On Sun, 2023-05-14 at 00:23 -0700, Kuppuswamy Sathyanarayanan wrote:
> Host-guest event notification via configured interrupt vector is useful
> in cases where a guest makes an asynchronous request and needs a
> callback from the host to indicate the completion or to let the host
> notify the guest about events like device removal. One usage example is,
> callback requirement of GetQuote asynchronous hypercall.
> 
> In TDX guest, SetupEventNotifyInterrupt hypercall can be used by the
> guest to specify which interrupt vector to use as an event-notify
> vector from the VMM. Details about the SetupEventNotifyInterrupt
> hypercall can be found in TDX Guest-Host Communication Interface
> (GHCI) Specification, section "VP.VMCALL<SetupEventNotifyInterrupt>".
> 
> As per design, VMM will post the event completion IRQ using the same
> CPU on which SetupEventNotifyInterrupt hypercall request is received.
> So allocate an IRQ vector from "x86_vector_domain", and set the CPU
> affinity of the IRQ vector to the CPU on which
> SetupEventNotifyInterrupt hypercall is made.
> 
> Add tdx_register_event_irq_cb()/tdx_unregister_event_irq_cb()
> interfaces to allow drivers to register/unregister event notification
> handlers.
> 
> Reviewed-by: Tony Luck <tony.luck@...el.com>
> Reviewed-by: Andi Kleen <ak@...ux.intel.com>
> Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Reviewed-by: Erdem Aktas <erdemaktas@...gle.com>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Acked-by: Wander Lairson Costa <wander@...hat.com>
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> 

Acked-by: Kai Huang <kai.huang@...el.com>