diff options
| author | Borislav Petkov (AMD) <bp@alien8.de> | 2023-03-07 09:19:19 -0600 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-03-13 12:35:02 +0100 |
| commit | 0fdb6cc7c89cb5e0cbc45dbdbafb8e3fb92ddc95 (patch) | |
| tree | 1ebdc1ae683fcd3a024ba497adaaefb0e9911cfe /drivers/virt/coco | |
| parent | c5a338274bdb894f088767bea856be344d0ccaef (diff) | |
virt/coco/sev-guest: Carve out the request issuing logic into a helper
This makes the code flow a lot easier to follow.
No functional changes.
[ Tom: touchups. ]
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230307192449.24732-6-bp@alien8.de
Diffstat (limited to 'drivers/virt/coco')
| -rw-r--r-- | drivers/virt/coco/sev-guest/sev-guest.c | 44 |
1 files changed, 27 insertions, 17 deletions
diff --git a/drivers/virt/coco/sev-guest/sev-guest.c b/drivers/virt/coco/sev-guest/sev-guest.c index a51bd4afd5ab..07dafe22b27a 100644 --- a/drivers/virt/coco/sev-guest/sev-guest.c +++ b/drivers/virt/coco/sev-guest/sev-guest.c @@ -318,27 +318,12 @@ static int enc_payload(struct snp_guest_dev *snp_dev, u64 seqno, int version, u8 return __enc_payload(snp_dev, req, payload, sz); } -static int handle_guest_request(struct snp_guest_dev *snp_dev, u64 exit_code, int msg_ver, - u8 type, void *req_buf, size_t req_sz, void *resp_buf, - u32 resp_sz, __u64 *fw_err) +static int __handle_guest_request(struct snp_guest_dev *snp_dev, u64 exit_code, __u64 *fw_err) { unsigned long err, override_err = 0; unsigned int override_npages = 0; - u64 seqno; int rc; - /* Get message sequence and verify that its a non-zero */ - seqno = snp_get_msg_seqno(snp_dev); - if (!seqno) - return -EIO; - - memset(snp_dev->response, 0, sizeof(struct snp_guest_msg)); - - /* Encrypt the userspace provided payload */ - rc = enc_payload(snp_dev, seqno, msg_ver, type, req_buf, req_sz); - if (rc) - return rc; - retry_request: /* * Call firmware to process the request. In this function the encrypted @@ -347,7 +332,6 @@ retry_request: * prevent reuse of the IV. */ rc = snp_issue_guest_request(exit_code, &snp_dev->input, &err); - switch (rc) { case -ENOSPC: /* @@ -401,7 +385,33 @@ retry_request: if (!rc && override_err == SNP_GUEST_REQ_INVALID_LEN) return -EIO; + return rc; +} + +static int handle_guest_request(struct snp_guest_dev *snp_dev, u64 exit_code, int msg_ver, + u8 type, void *req_buf, size_t req_sz, void *resp_buf, + u32 resp_sz, __u64 *fw_err) +{ + u64 seqno; + int rc; + + /* Get message sequence and verify that its a non-zero */ + seqno = snp_get_msg_seqno(snp_dev); + if (!seqno) + return -EIO; + + memset(snp_dev->response, 0, sizeof(struct snp_guest_msg)); + + /* Encrypt the userspace provided payload */ + rc = enc_payload(snp_dev, seqno, msg_ver, type, req_buf, req_sz); + if (rc) + return rc; + + rc = __handle_guest_request(snp_dev, exit_code, fw_err); if (rc) { + if (rc == -EIO && *fw_err == SNP_GUEST_REQ_INVALID_LEN) + return rc; + dev_alert(snp_dev->dev, "Detected error from ASP request. rc: %d, fw_err: %llu\n", rc, *fw_err); |