The branch main has been updated by kevans:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=625932c9aa2c9fc0d2fb7b10b838f40ca7d808fc

commit 625932c9aa2c9fc0d2fb7b10b838f40ca7d808fc
Author:     Kyle Evans <[email protected]>
AuthorDate: 2021-08-04 20:57:55 +0000
Commit:     Kyle Evans <[email protected]>
CommitDate: 2021-08-16 05:59:56 +0000

    hvsock: fail the probe on non-HyperV machines
    
    Differential Revision:  https://reviews.freebsd.org/D25459
---
 sys/dev/hyperv/hvsock/hv_sock.c | 31 +++++++++++++------------------
 1 file changed, 13 insertions(+), 18 deletions(-)

diff --git a/sys/dev/hyperv/hvsock/hv_sock.c b/sys/dev/hyperv/hvsock/hv_sock.c
index 00e296fcd335..a920d1850c7d 100644
--- a/sys/dev/hyperv/hvsock/hv_sock.c
+++ b/sys/dev/hyperv/hvsock/hv_sock.c
@@ -74,6 +74,8 @@ SYSCTL_INT(_net_hvsock, OID_AUTO, hvs_dbg_level, 
CTLFLAG_RWTUN, &hvs_dbg_level,
 
 MALLOC_DEFINE(M_HVSOCK, "hyperv_socket", "hyperv socket control structures");
 
+static int hvs_dom_probe(void);
+
 /* The MTU is 16KB per host side's design */
 #define HVSOCK_MTU_SIZE                (1024 * 16)
 #define HVSOCK_SEND_BUF_SZ     (PAGE_SIZE - sizeof(struct vmpipe_proto_header))
@@ -124,6 +126,7 @@ static struct protosw               hv_socket_protosw[] = {
 static struct domain           hv_socket_domain = {
        .dom_family =           AF_HYPERV,
        .dom_name =             "hyperv",
+       .dom_probe =            hvs_dom_probe,
        .dom_protosw =          hv_socket_protosw,
        .dom_protoswNPROTOSW =  &hv_socket_protosw[nitems(hv_socket_protosw)]
 };
@@ -323,6 +326,16 @@ hvs_trans_unlock(void)
        sx_xunlock(&hvs_trans_socks_sx);
 }
 
+static int
+hvs_dom_probe(void)
+{
+
+       /* Don't even give us a chance to attach on non-HyperV. */
+       if (vm_guest != VM_GUEST_HV)
+               return (ENXIO);
+       return (0);
+}
+
 void
 hvs_trans_init(void)
 {
@@ -330,9 +343,6 @@ hvs_trans_init(void)
        if (!IS_DEFAULT_VNET(curvnet))
                return;
 
-       if (vm_guest != VM_GUEST_HV)
-               return;
-
        HVSOCK_DBG(HVSOCK_DBG_VERBOSE,
            "%s: HyperV Socket hvs_trans_init called\n", __func__);
 
@@ -355,9 +365,6 @@ hvs_trans_attach(struct socket *so, int proto, struct 
thread *td)
 {
        struct hvs_pcb *pcb = so2hvspcb(so);
 
-       if (vm_guest != VM_GUEST_HV)
-               return (ESOCKTNOSUPPORT);
-
        HVSOCK_DBG(HVSOCK_DBG_VERBOSE,
            "%s: HyperV Socket hvs_trans_attach called\n", __func__);
 
@@ -384,9 +391,6 @@ hvs_trans_detach(struct socket *so)
 {
        struct hvs_pcb *pcb;
 
-       if (vm_guest != VM_GUEST_HV)
-               return;
-
        HVSOCK_DBG(HVSOCK_DBG_VERBOSE,
            "%s: HyperV Socket hvs_trans_detach called\n", __func__);
 
@@ -604,9 +608,6 @@ hvs_trans_disconnect(struct socket *so)
 {
        struct hvs_pcb *pcb;
 
-       if (vm_guest != VM_GUEST_HV)
-               return (ESOCKTNOSUPPORT);
-
        HVSOCK_DBG(HVSOCK_DBG_VERBOSE,
            "%s: HyperV Socket hvs_trans_disconnect called\n", __func__);
 
@@ -934,9 +935,6 @@ hvs_trans_close(struct socket *so)
 {
        struct hvs_pcb *pcb;
 
-       if (vm_guest != VM_GUEST_HV)
-               return;
-
        HVSOCK_DBG(HVSOCK_DBG_VERBOSE,
            "%s: HyperV Socket hvs_trans_close called\n", __func__);
 
@@ -978,9 +976,6 @@ hvs_trans_abort(struct socket *so)
 {
        struct hvs_pcb *pcb = so2hvspcb(so);
 
-       if (vm_guest != VM_GUEST_HV)
-               return;
-
        HVSOCK_DBG(HVSOCK_DBG_VERBOSE,
            "%s: HyperV Socket hvs_trans_abort called\n", __func__);
 
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