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x86/sev: Remove obsolete virtual address check

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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.

Link: https://lore.kernel.org/all/20251010151036.42241-2-ardb+git@google.com/
Reviewed-by: Alexey Kardashevskiy <aik@amd.com>
Tested-by: Alexey Kardashevskiy <aik@amd.com>
Tested-by: Nikunj A Dadhania <nikunj@amd.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://patch.msgid.link/20260722025338.33354-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
This commit is contained in:
Eric Biggers
2026-07-21 19:53:37 -07:00
parent 8d88e4b916
commit d1e2c82ced
1 changed files with 0 additions and 9 deletions
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9
arch/x86/coco/sev/core.c
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@@ -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 */