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crypto: ccp: Use the stack and common buffer for INIT command

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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@google.com>
Message-Id: <20210406224952.4177376-8-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>
This commit is contained in:
Sean Christopherson 2021-04-06 15:49:51 -07:00 committed by Paolo Bonzini
parent 38103671aa
commit a402e35177
2 changed files with 6 additions and 5 deletions
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10
drivers/crypto/ccp/sev-dev.c
View file

@ -234,6 +234,7 @@ 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_device *sev;
int rc = 0;
@ -245,6 +246,7 @@ static int __sev_platform_init_locked(int *error)
if (sev->state == SEV_STATE_INIT)
return 0;
memset(&data, 0, sizeof(data));
if (sev_es_tmr) {
u64 tmr_pa;
@ -254,12 +256,12 @@ 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;

1
drivers/crypto/ccp/sev-dev.h
View file

@ -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;