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) <[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. > > > > While at it, add HVCALL_GET_PARTITION_PROPERTY_EX to the allowed list of > > passthrough hypercalls. > > > > Signed-off-by: Anirudh Rayabharam (Microsoft) <[email protected]> > > 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 <[email protected]> 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. Thanks, Anirudh. > > Wei > > > --- > > drivers/hv/mshv_root_main.c | 11 ++++++++--- > > 1 file changed, 8 insertions(+), 3 deletions(-) > > > > diff --git a/drivers/hv/mshv_root_main.c b/drivers/hv/mshv_root_main.c > > index 20eda00a1b5a..98f56322cd19 100644 > > --- a/drivers/hv/mshv_root_main.c > > +++ b/drivers/hv/mshv_root_main.c > > @@ -122,6 +122,7 @@ static struct miscdevice mshv_dev = { > > */ > > static u16 mshv_passthru_hvcalls[] = { > > HVCALL_GET_PARTITION_PROPERTY, > > + HVCALL_GET_PARTITION_PROPERTY_EX, > > HVCALL_SET_PARTITION_PROPERTY, > > HVCALL_INSTALL_INTERCEPT, > > HVCALL_GET_VP_REGISTERS, > > @@ -159,6 +160,7 @@ static int mshv_ioctl_passthru_hvcall(struct > > mshv_partition *partition, > > unsigned int pages_order; > > void *input_pg = NULL; > > void *output_pg = NULL; > > + u64 pt_id = partition ? partition->pt_id : HV_PARTITION_ID_SELF; > > > > if (copy_from_user(&args, user_args, sizeof(args))) > > return -EFAULT; > > @@ -180,7 +182,7 @@ static int mshv_ioctl_passthru_hvcall(struct > > mshv_partition *partition, > > is_async = mshv_hvcall_is_async(args.code); > > if (is_async) { > > /* async hypercalls can only be called from partition fd */ > > - if (!partition_locked) > > + if (!partition || !partition_locked) > > return -EINVAL; > > ret = mshv_init_async_handler(partition); > > if (ret) > > @@ -208,7 +210,7 @@ static int mshv_ioctl_passthru_hvcall(struct > > mshv_partition *partition, > > * NOTE: This only works because all the allowed hypercalls' input > > * structs begin with a u64 partition_id field. > > */ > > - *(u64 *)input_pg = partition->pt_id; > > + *(u64 *)input_pg = pt_id; > > > > if (args.reps) > > status = hv_do_rep_hypercall(args.code, args.reps, 0, > > @@ -226,7 +228,7 @@ static int mshv_ioctl_passthru_hvcall(struct > > mshv_partition *partition, > > } > > > > if (hv_result(status) == HV_STATUS_INSUFFICIENT_MEMORY) { > > - ret = hv_call_deposit_pages(NUMA_NO_NODE, partition->pt_id, 1); > > + ret = hv_call_deposit_pages(NUMA_NO_NODE, pt_id, 1); > > if (!ret) > > ret = -EAGAIN; > > } else if (!hv_result_success(status)) { > > @@ -2048,6 +2050,9 @@ static long mshv_dev_ioctl(struct file *filp, > > unsigned int ioctl, > > case MSHV_CREATE_PARTITION: > > return mshv_ioctl_create_partition((void __user *)arg, > > misc->this_device); > > + case MSHV_ROOT_HVCALL: > > + return mshv_ioctl_passthru_hvcall(NULL, false, > > + (void __user *)arg); > > } > > > > return -ENOTTY; > > -- > > 2.34.1 > >
