[PATCH 2/3] x86/sev: Remove obsolete virtual address check

Virtual addresses used with the AES-GCM library don't have to be in the
linear mapping.  Remove the virt_addr_valid() checks from
snp_send_guest_request(), which were a workaround left over from when
this code used crypto_aead, which required scatterlists.

Signed-off-by: Eric Biggers <[email protected]>
---
 arch/x86/coco/sev/core.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c
index 54b122f6ef96a..cc292d7c6fd1e 100644
--- a/arch/x86/coco/sev/core.c
+++ b/arch/x86/coco/sev/core.c
@@ -1867,15 +1867,6 @@ int snp_send_guest_request(struct snp_msg_desc *mdesc, struct snp_guest_req *req
 	u64 seqno;
 	int rc;
 
-	/*
-	 * enc_payload() calls aesgcm_encrypt(), which can potentially offload to HW.
-	 * The offload's DMA SG list of data to encrypt has to be in linear mapping.
-	 */
-	if (!virt_addr_valid(req->req_buf) || !virt_addr_valid(req->resp_buf)) {
-		pr_warn("AES-GSM buffers must be in linear mapping");
-		return -EINVAL;
-	}
-
 	guard(mutex)(&snp_cmd_mutex);
 
 	/* Check if the VMPCK is not empty */
-- 
2.55.0