lkml.org 
[lkml]   [2023]   [Jun]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH v3 1/3] x86/tdx: Add TDX Guest event notify interrupt support
Date
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@intel.com>
> Reviewed-by: Andi Kleen <ak@linux.intel.com>
> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> Reviewed-by: Erdem Aktas <erdemaktas@google.com>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Acked-by: Wander Lairson Costa <wander@redhat.com>
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
>

Acked-by: Kai Huang <kai.huang@intel.com>
\
 
 \ /
  Last update: 2023-06-12 14:51    [W:0.290 / U:0.220 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site