Le 07/04/2021 à 00:49, Sean Christopherson a écrit :
Drop the dedicated init_cmd_buf and instead use a local variable. 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@xxxxxxxxxx>
---
drivers/crypto/ccp/sev-dev.c | 10 ++++++----
drivers/crypto/ccp/sev-dev.h | 1 -
2 files changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index e54774b0d637..9ff28df03030 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -233,6 +233,7 @@ static int sev_do_cmd(int cmd, void *data, int *psp_ret)
static int __sev_platform_init_locked(int *error)
{
struct psp_device *psp = psp_master;
+ struct sev_data_init data;
struct sev_data_init data = {0, 0, 0, 0};
struct sev_device *sev;
int rc = 0;
@@ -244,6 +245,7 @@ static int __sev_platform_init_locked(int *error)
if (sev->state == SEV_STATE_INIT)
return 0;
+ memset(&data, 0, sizeof(data));
Not needed.
if (sev_es_tmr) {
u64 tmr_pa;
@@ -253,12 +255,12 @@ static int __sev_platform_init_locked(int *error)
*/
tmr_pa = __pa(sev_es_tmr);
- sev->init_cmd_buf.flags |= SEV_INIT_FLAGS_SEV_ES;
- sev->init_cmd_buf.tmr_address = tmr_pa;
- sev->init_cmd_buf.tmr_len = SEV_ES_TMR_SIZE;
+ data.flags |= SEV_INIT_FLAGS_SEV_ES;
+ data.tmr_address = tmr_pa;
+ data.tmr_len = SEV_ES_TMR_SIZE;
}
- rc = __sev_do_cmd_locked(SEV_CMD_INIT, &sev->init_cmd_buf, error);
+ rc = __sev_do_cmd_locked(SEV_CMD_INIT, &data, error);
if (rc)
return rc;
diff --git a/drivers/crypto/ccp/sev-dev.h b/drivers/crypto/ccp/sev-dev.h
index 0fd21433f627..666c21eb81ab 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_data_init init_cmd_buf;
u8 api_major;
u8 api_minor;
