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Drivers: hv: Post messages through the confidential VMBus if available

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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>
This commit is contained in:
Roman Kisel 2025-10-08 16:34:10 -07:00 committed by Wei Liu
parent 226494e5ee
commit 25059d5e4c
1 changed files with 10 additions and 1 deletions
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11
drivers/hv/hv.c
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@ -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);
}