linux-kernel - Re: [PATCH v2 1/3] virt: acrn: Introduce interfaces for MMIO device passthrough

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Date:   Fri, 27 Aug 2021 10:45:32 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Li Fei1 <fei1.li@...el.com>
Cc:     linux-kernel@...r.kernel.org, yu1.wang@...el.com,
        shuox.liu@...il.com
Subject: Re: [PATCH v2 1/3] virt: acrn: Introduce interfaces for MMIO device
 passthrough

On Thu, Aug 26, 2021 at 09:38:38AM +0800, Li Fei1 wrote:
> On Wed, Aug 25, 2021 at 10:43:29PM +0200, Greg KH wrote:
> > On Wed, Aug 25, 2021 at 05:01:40PM +0800, Fei Li wrote:
> > > From: Shuo Liu <shuo.a.liu@...el.com>
> > > 
> > > MMIO device passthrough enables an OS in a virtual machine to directly
> > > access a MMIO device in the host. It promises almost the native
> > > performance, which is required in performance-critical scenarios of
> > > ACRN.
> > > 
> > > HSM provides the following ioctls:
> > >   - Assign - ACRN_IOCTL_ASSIGN_MMIODEV
> > >     Pass data struct acrn_mmiodev from userspace to the hypervisor, and
> > >     inform the hypervisor to assign a MMIO device to a User VM.
> > > 
> > >   - De-assign - ACRN_IOCTL_DEASSIGN_PCIDEV
> > >     Pass data struct acrn_mmiodev from userspace to the hypervisor, and
> > >     inform the hypervisor to de-assign a MMIO device from a User VM.
> > > 
> > > Signed-off-by: Shuo Liu <shuo.a.liu@...el.com>
> > > Signed-off-by: Fei Li <fei1.li@...el.com>
> > 
> > Where is the userspace code that uses this new api?
> 
> Hi Greg
> 
> An ACRN userspace application (like QEMU) would uses these new apis in
> https://github.com/projectacrn/acrn-hypervisor/blob/master/devicemodel/core/vmmapi.c#L562
> and
> https://github.com/projectacrn/acrn-hypervisor/blob/master/devicemodel/core/vmmapi.c#L568

Please provide links in all of these patches when you resend them, to
the userspace code as well, so that we know how it all works together.

thanks,

greg k-h