diff options
| author | Roman Kisel <romank@linux.microsoft.com> | 2025-10-08 16:34:10 -0700 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2025-11-15 06:18:15 +0000 |
| commit | 25059d5e4c5af37688797d87b2d2004ac1cddff7 (patch) | |
| tree | 3e31489767f1a9fe3ca77b989e1c04418d6e0405 /drivers | |
| parent | 226494e5ee4eb0bae4fc7b525505828271d5047e (diff) | |
Drivers: hv: Post messages through the confidential VMBus if available
When the confidential VMBus is available, the guest should post
messages to the paravisor.
Update hv_post_message() to post messages to the paravisor rather than
through GHCB or TD calls.
Signed-off-by: Roman Kisel <romank@linux.microsoft.com>
Reviewed-by: Tianyu Lan <tiala@microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hv/hv.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index d380e0df63f3..aca3a275bb1f 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -74,7 +74,11 @@ int hv_post_message(union hv_connection_id connection_id, aligned_msg->payload_size = payload_size; memcpy((void *)aligned_msg->payload, payload, payload_size); - if (ms_hyperv.paravisor_present) { + if (ms_hyperv.paravisor_present && !vmbus_is_confidential()) { + /* + * If the VMBus isn't confidential, use the CoCo-specific + * mechanism to communicate with the hypervisor. + */ if (hv_isolation_type_tdx()) status = hv_tdx_hypercall(HVCALL_POST_MESSAGE, virt_to_phys(aligned_msg), 0); @@ -88,6 +92,11 @@ int hv_post_message(union hv_connection_id connection_id, u64 control = HVCALL_POST_MESSAGE; control |= hv_nested ? HV_HYPERCALL_NESTED : 0; + /* + * If there is no paravisor, this will go to the hypervisor. + * In the Confidential VMBus case, there is the paravisor + * to which this will trap. + */ status = hv_do_hypercall(control, aligned_msg, NULL); } |