On 11/19/2025 9:17 AM, Anirudh Rayabharam wrote:
> From: Anirudh Rayabharam (Microsoft) <[email protected]>
>
> 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) <[email protected]>
> ---
>
> v3: restricted the allowed self-targeted passthrough hypercalls to
> smaller, carefully selected list.
> v2: rebased on latest hyperv-next
>
> ---
> drivers/hv/mshv_root_main.c | 47 ++++++++++++++++++++++++++++++-------
> 1 file changed, 38 insertions(+), 9 deletions(-)
>
Reviewed-by: Nuno Das Neves <[email protected]>
