linux-kernel - Re: [PATCH v3] Drivers: hv: ioctl for self targeted passthrough hvcalls

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] [day] [month] [year] [list]

Message-ID: <20251120065559.GA2858107@liuwe-devbox-debian-v2.local>
Date: Thu, 20 Nov 2025 06:55:59 +0000
From: Wei Liu <wei.liu@...nel.org>
To: Anirudh Rayabharam <anirudh@...rudhrb.com>
Cc: "K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
	Long Li <longli@...rosoft.com>, linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] Drivers: hv: ioctl for self targeted passthrough
 hvcalls

On Wed, Nov 19, 2025 at 05:17:08PM +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.
> 
> Since hypercalls targeting the host partition could potentially perform
> privileged operations, allow only a limited set of hypercalls. To begin
> with, allow only:
> 
> 	HVCALL_GET_PARTITION_PROPERTY
> 	HVCALL_GET_PARTITION_PROPERTY_EX
> 
> Signed-off-by: Anirudh Rayabharam (Microsoft) <anirudh@...rudhrb.com>

Applied to hyperv-next.

I dropped one "inline" keyword that was not needed and modified the
subject prefix to be "mshv".

Wei