diff options
| author | Sean Christopherson <seanjc@google.com> | 2021-04-06 15:49:50 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-04-21 12:20:07 -0400 |
| commit | 38103671aad38e888743dd26c767869cfc15adca (patch) | |
| tree | 0361e4060ce8ffe82291d57ff0e88abebf7f0340 /drivers/crypto | |
| parent | e4a9af799e5539b0feb99571f0aaed5a3c81dc5a (diff) | |
| download | lwn-38103671aad38e888743dd26c767869cfc15adca.tar.gz lwn-38103671aad38e888743dd26c767869cfc15adca.zip | |
crypto: ccp: Use the stack and common buffer for status commands
Drop the dedicated status_cmd_buf and instead use a local variable for
PLATFORM_STATUS. Now that the low level helper uses an internal buffer
for all commands, using the stack for the upper layers is safe even when
running with CONFIG_VMAP_STACK=y.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210406224952.4177376-7-seanjc@google.com>
Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'drivers/crypto')
| -rw-r--r-- | drivers/crypto/ccp/sev-dev.c | 27 | ||||
| -rw-r--r-- | drivers/crypto/ccp/sev-dev.h | 1 |
2 files changed, 12 insertions, 16 deletions
diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 246b281b6376..2184c4a67d35 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -316,15 +316,14 @@ static int sev_platform_shutdown(int *error) static int sev_get_platform_state(int *state, int *error) { - struct sev_device *sev = psp_master->sev_data; + struct sev_user_data_status data; int rc; - rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, - &sev->status_cmd_buf, error); + rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, error); if (rc) return rc; - *state = sev->status_cmd_buf.state; + *state = data.state; return rc; } @@ -362,15 +361,14 @@ static int sev_ioctl_do_reset(struct sev_issue_cmd *argp, bool writable) static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp) { - struct sev_device *sev = psp_master->sev_data; - struct sev_user_data_status *data = &sev->status_cmd_buf; + struct sev_user_data_status data; int ret; - ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error); + ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, &argp->error); if (ret) return ret; - if (copy_to_user((void __user *)argp->data, data, sizeof(*data))) + if (copy_to_user((void __user *)argp->data, &data, sizeof(data))) ret = -EFAULT; return ret; @@ -469,21 +467,20 @@ EXPORT_SYMBOL_GPL(psp_copy_user_blob); static int sev_get_api_version(void) { struct sev_device *sev = psp_master->sev_data; - struct sev_user_data_status *status; + struct sev_user_data_status status; int error = 0, ret; - status = &sev->status_cmd_buf; - ret = sev_platform_status(status, &error); + ret = sev_platform_status(&status, &error); if (ret) { dev_err(sev->dev, "SEV: failed to get status. Error: %#x\n", error); return 1; } - sev->api_major = status->api_major; - sev->api_minor = status->api_minor; - sev->build = status->build; - sev->state = status->state; + sev->api_major = status.api_major; + sev->api_minor = status.api_minor; + sev->build = status.build; + sev->state = status.state; return 0; } diff --git a/drivers/crypto/ccp/sev-dev.h b/drivers/crypto/ccp/sev-dev.h index e1572f408577..0fd21433f627 100644 --- a/drivers/crypto/ccp/sev-dev.h +++ b/drivers/crypto/ccp/sev-dev.h @@ -46,7 +46,6 @@ struct sev_device { unsigned int int_rcvd; wait_queue_head_t int_queue; struct sev_misc_dev *misc; - struct sev_user_data_status status_cmd_buf; struct sev_data_init init_cmd_buf; u8 api_major; |