mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-12-27 08:45:26 -05:00
Code Issues Packages Projects Releases Wiki Activity

Drivers: hv: Support confidential VMBus channels

Browse Source 
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>
This commit is contained in:
Roman Kisel
2025-10-08 16:34:17 -07:00
committed by Wei Liu
parent 510164539f
commit bf35d298bb
2 changed files with 22 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/hv/channel_mgmt.c
View File

@@ -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);

3
drivers/hv/connection.c
View File

@@ -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