linux-kernel - [PATCH hyperv-next v3 07/15] Drivers: hv: Post messages via the confidential VMBus if available

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Message-ID: <20250604004341.7194-8-romank@linux.microsoft.com>
Date: Tue,  3 Jun 2025 17:43:33 -0700
From: Roman Kisel <romank@...ux.microsoft.com>
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Subject: [PATCH hyperv-next v3 07/15] Drivers: hv: Post messages via the confidential VMBus if available

When the confidential VMBus is available, the guest should post
messages via the paravisor.

Update hv_post_message() to request posting messages from the paravisor
rather than through GHCB or TD calls.

Signed-off-by: Roman Kisel <romank@...ux.microsoft.com>
---
 drivers/hv/hv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index e25c91eb6af5..1f7cf1244509 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -74,7 +74,7 @@ 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 (hv_isolation_type_tdx())
 			status = hv_tdx_hypercall(HVCALL_POST_MESSAGE,
 						  virt_to_phys(aligned_msg), 0);
-- 
2.43.0