Messages in this thread Patch in this message | | | From | Nikunj A Dadhania <> | Subject | [PATCH v3 02/14] virt: sev-guest: Move mutex to SNP guest device structure | Date | Sat, 22 Jul 2023 16:48:57 +0530 |
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In preparation for providing a new API to the sev-guest driver for sending an SNP guest message, move the SNP command mutex to the snp_guest_dev structure.
Signed-off-by: Nikunj A Dadhania <nikunj@amd.com> Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com> --- drivers/virt/coco/sev-guest/sev-guest.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-)
diff --git a/drivers/virt/coco/sev-guest/sev-guest.c b/drivers/virt/coco/sev-guest/sev-guest.c index 520e2b6613a7..8ba624088d73 100644 --- a/drivers/virt/coco/sev-guest/sev-guest.c +++ b/drivers/virt/coco/sev-guest/sev-guest.c @@ -35,6 +35,9 @@ struct snp_guest_dev { struct device *dev; struct miscdevice misc; + /* Mutex to serialize the shared buffer access and command handling. */ + struct mutex cmd_mutex; + void *certs_data; struct aesgcm_ctx *ctx; /* request and response are in unencrypted memory */ @@ -56,9 +59,6 @@ static u32 vmpck_id; module_param(vmpck_id, uint, 0444); MODULE_PARM_DESC(vmpck_id, "The VMPCK ID to use when communicating with the PSP."); -/* Mutex to serialize the shared buffer access and command handling. */ -static DEFINE_MUTEX(snp_cmd_mutex); - static inline unsigned int get_ctx_authsize(struct snp_guest_dev *snp_dev) { if (snp_dev && snp_dev->ctx) @@ -107,7 +107,7 @@ static inline u64 __snp_get_msg_seqno(struct snp_guest_dev *snp_dev) { u64 count; - lockdep_assert_held(&snp_cmd_mutex); + lockdep_assert_held(&snp_dev->cmd_mutex); /* Read the current message sequence counter from secrets pages */ count = *snp_dev->os_area_msg_seqno; @@ -403,7 +403,7 @@ static int get_report(struct snp_guest_dev *snp_dev, struct snp_guest_request_io struct snp_report_req req; int rc, resp_len; - lockdep_assert_held(&snp_cmd_mutex); + lockdep_assert_held(&snp_dev->cmd_mutex); if (!arg->req_data || !arg->resp_data) return -EINVAL; @@ -443,7 +443,7 @@ static int get_derived_key(struct snp_guest_dev *snp_dev, struct snp_guest_reque /* Response data is 64 bytes and max authsize for GCM is 16 bytes. */ u8 buf[64 + 16]; - lockdep_assert_held(&snp_cmd_mutex); + lockdep_assert_held(&snp_dev->cmd_mutex); if (!arg->req_data || !arg->resp_data) return -EINVAL; @@ -481,7 +481,7 @@ static int get_ext_report(struct snp_guest_dev *snp_dev, struct snp_guest_reques struct snp_report_resp *resp; int ret, npages = 0, resp_len; - lockdep_assert_held(&snp_cmd_mutex); + lockdep_assert_held(&snp_dev->cmd_mutex); if (!arg->req_data || !arg->resp_data) return -EINVAL; @@ -566,12 +566,12 @@ static long snp_guest_ioctl(struct file *file, unsigned int ioctl, unsigned long if (!input.msg_version) return -EINVAL; - mutex_lock(&snp_cmd_mutex); + mutex_lock(&snp_dev->cmd_mutex); /* Check if the VMPCK is not empty */ if (is_vmpck_empty(snp_dev)) { dev_err_ratelimited(snp_dev->dev, "VMPCK is disabled\n"); - mutex_unlock(&snp_cmd_mutex); + mutex_unlock(&snp_dev->cmd_mutex); return -ENOTTY; } @@ -589,7 +589,7 @@ static long snp_guest_ioctl(struct file *file, unsigned int ioctl, unsigned long break; } - mutex_unlock(&snp_cmd_mutex); + mutex_unlock(&snp_dev->cmd_mutex); if (input.exitinfo2 && copy_to_user(argp, &input, sizeof(input))) return -EFAULT; @@ -708,6 +708,7 @@ static int __init sev_guest_probe(struct platform_device *pdev) goto e_unmap; } + mutex_init(&snp_dev->cmd_mutex); platform_set_drvdata(pdev, snp_dev); snp_dev->dev = dev; snp_dev->layout = layout; -- 2.34.1
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