Messages in this thread Patch in this message | | | From | Borislav Petkov <> | Subject | [PATCH -v2 05/11] virt/coco/sev-guest: Carve out the request issuing logic into a helper | Date | Tue, 21 Feb 2023 12:34:22 +0100 |
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From: "Borislav Petkov (AMD)" <bp@alien8.de>
This makes the code flow a lot easier to follow.
No functional changes.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> --- drivers/virt/coco/sev-guest/sev-guest.c | 41 +++++++++++++++---------- 1 file changed, 24 insertions(+), 17 deletions(-)
diff --git a/drivers/virt/coco/sev-guest/sev-guest.c b/drivers/virt/coco/sev-guest/sev-guest.c index c0ecc5885573..e72289de2b28 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 @@ static int handle_guest_request(struct snp_guest_dev *snp_dev, u64 exit_code, in * prevent reuse of the IV. */ rc = snp_issue_guest_request(exit_code, &snp_dev->input, &err); - switch (rc) { case -ENOSPC: /* @@ -384,6 +368,29 @@ static int handle_guest_request(struct snp_guest_dev *snp_dev, u64 exit_code, in if (override_npages) snp_dev->input.data_npages = override_npages; + 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) { dev_alert(snp_dev->dev, "Detected error from ASP request. rc: %d, fw_err: %llu\n", -- 2.35.1
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