netdev - Re: [PATCH v1 2/2] Drivers: hv: Make CONFIG

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <d7d7b23f-eaea-2dbc-9c9d-4bee082f6fe7@linux.microsoft.com>
Date: Mon, 8 Sep 2025 14:01:34 -0700
From: Mukesh R <mrathor@...ux.microsoft.com>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 linux-input@...r.kernel.org, linux-hyperv@...r.kernel.org,
 netdev@...r.kernel.org, linux-pci@...r.kernel.org,
 linux-scsi@...r.kernel.org, linux-fbdev@...r.kernel.org,
 linux-arch@...r.kernel.org, virtualization@...ts.linux.dev,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de,
 airlied@...il.com, simona@...ll.ch, jikos@...nel.org, bentiss@...nel.org,
 kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
 decui@...rosoft.com, dmitry.torokhov@...il.com, andrew+netdev@...n.ch,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, bhelgaas@...gle.com,
 James.Bottomley@...senpartnership.com, martin.petersen@...cle.com,
 deller@....de, arnd@...db.de, sgarzare@...hat.com, horms@...nel.org
Subject: Re: [PATCH v1 2/2] Drivers: hv: Make CONFIG_HYPERV bool

On 9/6/25 04:36, Greg KH wrote:
> On Fri, Sep 05, 2025 at 06:09:52PM -0700, Mukesh Rathor wrote:
>> With CONFIG_HYPERV and CONFIG_HYPERV_VMBUS separated, change CONFIG_HYPERV
>> to bool from tristate. CONFIG_HYPERV now becomes the core Hyper-V
>> hypervisor support, such as hypercalls, clocks/timers, Confidential
>> Computing setup, PCI passthru, etc. that doesn't involve VMBus or VMBus
>> devices.
> 
> But why are you making it so that this can not be a module anymore?  You
> are now forcing ALL Linux distro users to always have this code in their
> system, despite not ever using the feature.  That feels like a waste to
> me.
> 
> What is preventing this from staying as a module?  Why must you always
> have this code loaded at all times for everyone?

This is currently not a module. I assume it was at the beginning. In
drivers/Makefile today:

obj-$(subst m,y,$(CONFIG_HYPERV))       += hv/


More context: CONFIG_HYPERV doesn't really reflect one module. It is
both for kernel built in code and building of stuff in drivers/hv.

drivers/hv then builds 4 modules:

obj-$(CONFIG_HYPERV)            += hv_vmbus.o
obj-$(CONFIG_HYPERV_UTILS)      += hv_utils.o
obj-$(CONFIG_HYPERV_BALLOON)    += hv_balloon.o
obj-$(CONFIG_MSHV_ROOT)         += mshv_root.o

Notice vmbus is using CONFIG_HYPERV because there is no 
CONFIG_HYPERV_VMBUS. We are trying to fix that here.

Thanks,
-Mukesh

> thanks,
> 
> greg k-h