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Drivers: hv: vmbus: add vmbus_establish_gpadl_caller_decrypted()

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Add a new vmbus_establish_gpadl_caller_decrypted() for callers that want to
decrypt their own buffers. Add a new hv_gpadl_type,
HV_GPADL_BUFFER_DECRYPTED, to communicate the decryption status of the
buffer.

No functional change for existing callers.

Signed-off-by: Kameron Carr <kameroncarr@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Kameron Carr
2026-08-11 09:04:45 -07:00
committed by Wei Liu
parent cee0d90bce
commit 8f1da3536b
2 changed files with 32 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/hv/channel.c
View File

@@ -40,6 +40,7 @@ static inline u32 hv_gpadl_size(enum hv_gpadl_type type, u32 size)
{
switch (type) {
case HV_GPADL_BUFFER:
case HV_GPADL_BUFFER_DECRYPTED:
return size;
case HV_GPADL_RING:
/* The size of a ringbuffer must be page-aligned */
@@ -100,6 +101,7 @@ static inline u64 hv_gpadl_hvpfn(enum hv_gpadl_type type, void *kbuffer,
switch (type) {
case HV_GPADL_BUFFER:
case HV_GPADL_BUFFER_DECRYPTED:
break;
case HV_GPADL_RING:
if (i == 0)
@@ -460,7 +462,8 @@ static int __vmbus_establish_gpadl(struct vmbus_channel *channel,
}
gpadl->decrypted = !((channel->co_external_memory && type == HV_GPADL_BUFFER) ||
(channel->co_ring_buffer && type == HV_GPADL_RING));
(channel->co_ring_buffer && type == HV_GPADL_RING) ||
(type == HV_GPADL_BUFFER_DECRYPTED));
if (gpadl->decrypted) {
/*
* The "decrypted" flag being true assumes that set_memory_decrypted() succeeds.
@@ -575,7 +578,7 @@ static int __vmbus_establish_gpadl(struct vmbus_channel *channel,
* @channel: a channel
* @kbuffer: from kmalloc or vmalloc
* @size: page-size multiple
* @gpadl_handle: some funky thing
* @gpadl: output gpadl
*/
int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
u32 size, struct vmbus_gpadl *gpadl)
@@ -585,6 +588,26 @@ int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
}
EXPORT_SYMBOL_GPL(vmbus_establish_gpadl);
/*
* vmbus_establish_gpadl_caller_decrypted - Establish a GPADL for a buffer
* that has already been decrypted by the caller.
*
* @channel: a channel
* @kbuffer: from kmalloc or vmalloc; must already be decrypted by the caller
* @size: page-size multiple
* @gpadl: output gpadl
*
* The caller is responsible for re-encrypting the buffer before freeing it.
*/
int vmbus_establish_gpadl_caller_decrypted(struct vmbus_channel *channel,
void *kbuffer, u32 size,
struct vmbus_gpadl *gpadl)
{
return __vmbus_establish_gpadl(channel, HV_GPADL_BUFFER_DECRYPTED,
kbuffer, size, 0U, gpadl);
}
EXPORT_SYMBOL_GPL(vmbus_establish_gpadl_caller_decrypted);
/**
* request_arr_init - Allocates memory for the requestor array. Each slot
* keeps track of the next available slot in the array. Initially, each

8
include/linux/hyperv.h
View File

@@ -70,7 +70,8 @@
*/
enum hv_gpadl_type {
HV_GPADL_BUFFER,
HV_GPADL_RING
HV_GPADL_RING,
HV_GPADL_BUFFER_DECRYPTED
};
/* Single-page buffer */
@@ -1205,6 +1206,11 @@ extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
u32 size,
struct vmbus_gpadl *gpadl);
extern int vmbus_establish_gpadl_caller_decrypted(struct vmbus_channel *channel,
void *kbuffer,
u32 size,
struct vmbus_gpadl *gpadl);
extern int vmbus_teardown_gpadl(struct vmbus_channel *channel,
struct vmbus_gpadl *gpadl);