linux-kernel - Re: [PATCH] Drivers: hv: ioctl for self targeted passthrough hvcalls

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Message-ID: <20251115074602.GB1794663@liuwe-devbox-debian-v2.local>
Date: Sat, 15 Nov 2025 07:46:02 +0000
From: Wei Liu <wei.liu@...nel.org>
To: Anirudh Rayabharam <anirudh@...rudhrb.com>
Cc: Wei Liu <wei.liu@...nel.org>, "K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Dexuan Cui <decui@...rosoft.com>, Long Li <longli@...rosoft.com>,
	linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Drivers: hv: ioctl for self targeted passthrough hvcalls

On Sat, Nov 15, 2025 at 01:09:12PM +0530, Anirudh Rayabharam wrote:
> On Sat, Nov 15, 2025 at 06:22:40AM +0000, Wei Liu wrote:
> > On Fri, Nov 14, 2025 at 09:58:52AM +0000, Anirudh Rayabharam wrote:
> > > From: Anirudh Rayabharam (Microsoft) <anirudh@...rudhrb.com>
> > > 
> > > Allow MSHV_ROOT_HVCALL IOCTL on the /dev/mshv fd. This IOCTL would
> > > execute a passthrough hypercall targeting the root/parent partition
> > > i.e. HV_PARTITION_ID_SELF.
> > > 
> > > This will be useful for the VMM to query things like supported
> > > synthetic processor features, supported VMM capabiliites etc.
> > > 
> > > While at it, add HVCALL_GET_PARTITION_PROPERTY_EX to the allowed list of
> > > passthrough hypercalls.
> > > 
> > > Signed-off-by: Anirudh Rayabharam (Microsoft) <anirudh@...rudhrb.com>
> > 
> > This doesn't apply to hyperv-next. What's its base?
> 
> Hmmm... I remember doing this on hyperv-next. This the parent I see:
> 
> commit f2329fd987a0da4759c307c46fd27c4d05bb7433
> Author: Naman Jain <namjain@...ux.microsoft.com>
> Date:   Thu Nov 13 04:41:49 2025 +0000
> 
>     Drivers: hv: Introduce mshv_vtl driver
> 
> No worries, I can rebase it on hyperv-next and send it again.

I pulled in some patches from hyperv-fixes to hyperv-next. That's
probably why. But you will see that eventually during a merge later
anyway, so it is good to just rebase and resend.

Wei

> 
> Thanks,
> Anirudh.
>