diff options
| author | Roman Kisel <romank@linux.microsoft.com> | 2025-10-08 16:34:17 -0700 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2025-11-15 06:18:15 +0000 |
| commit | bf35d298bb9ab2ccbcf654c1acb65ddc758ad690 (patch) | |
| tree | a4a52f58feda14483130e25fe1284834557e37a0 | |
| parent | 510164539f16062e842a9de762616b5008616fa1 (diff) | |
Drivers: hv: Support confidential VMBus channels
To make use of Confidential VMBus channels, initialize the
co_ring_buffers and co_external_memory fields of the channel
structure.
Advertise support upon negotiating the version and compute
values for those fields and initialize them.
Signed-off-by: Roman Kisel <romank@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
| -rw-r--r-- | drivers/hv/channel_mgmt.c | 19 | ||||
| -rw-r--r-- | drivers/hv/connection.c | 3 |
2 files changed, 22 insertions, 0 deletions
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c index 6d66cbc9030b..74fed2c073d4 100644 --- a/drivers/hv/channel_mgmt.c +++ b/drivers/hv/channel_mgmt.c @@ -1022,6 +1022,7 @@ static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) struct vmbus_channel_offer_channel *offer; struct vmbus_channel *oldchannel, *newchannel; size_t offer_sz; + bool co_ring_buffer, co_external_memory; offer = (struct vmbus_channel_offer_channel *)hdr; @@ -1034,6 +1035,22 @@ static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) return; } + co_ring_buffer = is_co_ring_buffer(offer); + co_external_memory = is_co_external_memory(offer); + if (!co_ring_buffer && co_external_memory) { + pr_err("Invalid offer relid=%d: the ring buffer isn't encrypted\n", + offer->child_relid); + return; + } + if (co_ring_buffer || co_external_memory) { + if (vmbus_proto_version < VERSION_WIN10_V6_0 || !vmbus_is_confidential()) { + pr_err("Invalid offer relid=%d: no support for confidential VMBus\n", + offer->child_relid); + atomic_dec(&vmbus_connection.offer_in_progress); + return; + } + } + oldchannel = find_primary_channel_by_offer(offer); if (oldchannel != NULL) { @@ -1112,6 +1129,8 @@ static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) pr_err("Unable to allocate channel object\n"); return; } + newchannel->co_ring_buffer = co_ring_buffer; + newchannel->co_external_memory = co_external_memory; vmbus_setup_channel_state(newchannel, offer); diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c index 1fe3573ae52a..5ac9232396f7 100644 --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -105,6 +105,9 @@ int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version) vmbus_connection.msg_conn_id = VMBUS_MESSAGE_CONNECTION_ID; } + if (vmbus_is_confidential() && version >= VERSION_WIN10_V6_0) + msg->feature_flags = VMBUS_FEATURE_FLAG_CONFIDENTIAL_CHANNELS; + /* * shared_gpa_boundary is zero in non-SNP VMs, so it's safe to always * bitwise OR it |