linux-kernel - Re: [PATCH v2 5/7] tools: hv: Add new fcopy application based on uio driver

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Message-ID: <20240321180705.GA12387@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date: Thu, 21 Mar 2024 11:07:06 -0700
From: Saurabh Singh Sengar <ssengar@...ux.microsoft.com>
To: Long Li <longli@...rosoft.com>
Cc: KY Srinivasan <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"wei.liu@...nel.org" <wei.liu@...nel.org>,
	Dexuan Cui <decui@...rosoft.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	Saurabh Singh Sengar <ssengar@...rosoft.com>
Subject: Re: [PATCH v2 5/7] tools: hv: Add new fcopy application based on uio
 driver

On Thu, Mar 21, 2024 at 04:42:44PM +0000, Long Li wrote:
> > Subject: [PATCH v2 5/7] tools: hv: Add new fcopy application based on uio driver
> > 
> > New fcopy application using uio_hv_generic driver. This application copies file
> > from Hyper-V host to guest VM.
> > 
> > A big part of this code is copied from tools/hv/hv_fcopy_daemon.c which this new
> > application is replacing.
> > 
> > Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
> > ---
> > [V2]
> > - Improve commit message.
> > - Change (4 * 4096) to 0x4000 for ring buffer size
> > - Removed some unnecessary type casting.
> > - Mentioned in file copy right header that this code is copied.
> > - Changed the print from "Registration failed" to "Signal to host failed".
> > - Fixed mask for rx buffer interrupt to 0 before waiting for interrupt.
> > 
> >  tools/hv/Build                 |   3 +-
> >  tools/hv/Makefile              |  10 +-
> >  tools/hv/hv_fcopy_uio_daemon.c | 490
> > +++++++++++++++++++++++++++++++++
> >  3 files changed, 497 insertions(+), 6 deletions(-)  create mode 100644
> > tools/hv/hv_fcopy_uio_daemon.c
> > 
> > diff --git a/tools/hv/Build b/tools/hv/Build index 6cf51fa4b306..7d1f1698069b
> > 100644
> > --- a/tools/hv/Build
> > +++ b/tools/hv/Build
> > @@ -1,3 +1,4 @@
> >  hv_kvp_daemon-y += hv_kvp_daemon.o
> >  hv_vss_daemon-y += hv_vss_daemon.o
> > -hv_fcopy_daemon-y += hv_fcopy_daemon.o
> > +hv_fcopy_uio_daemon-y += hv_fcopy_uio_daemon.o hv_fcopy_uio_daemon-y
> > +=
> > +vmbus_bufring.o
> > diff --git a/tools/hv/Makefile b/tools/hv/Makefile index
> > fe770e679ae8..944180cf916e 100644
> > --- a/tools/hv/Makefile
> > +++ b/tools/hv/Makefile
> 
> I'm not sure if vmbus_bufring will compile on ARM.
> If it's not supported, can use some flags in Makefile to not build this.

You are right, this is not supported on ARM64. I can query uname in Makefile
and compile this only for arch != aarch64.
I will add this info in commit message as well.

- Saurabh