Re: [patch v2] crypto: ccp - Fix SEV_VERSION_GREATER_OR_EQUAL

[Gary R Hook]

On 7/15/19 12:03 PM, Lendacky, Thomas wrote:
> On 7/12/19 3:41 PM, David Rientjes wrote:
>> SEV_VERSION_GREATER_OR_EQUAL() will fail if upgrading from 2.2 to 3.1, for
>> example, because the minor version is not equal to or greater than the
>> major.
>>
>> Fix this and move to a static inline function for appropriate type
>> checking.
>>
>> Fixes: edd303ff0e9e ("crypto: ccp - Add DOWNLOAD_FIRMWARE SEV command")
>> Reported-by: Cfir Cohen <cfir@xxxxxxxxxx>
>> Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
> 
> Acked-by: Tom Lendacky <thomas.lendacky@xxxxxxx>

Acked-by: Gary R Hook <gary.hook@xxxxxxx>

> 
>> ---
>>   v2: no need to check api_major >= maj after checking api_major > maj
>>       per Thomas
>>
>>   drivers/crypto/ccp/psp-dev.c | 19 ++++++++++++-------
>>   1 file changed, 12 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
>> --- a/drivers/crypto/ccp/psp-dev.c
>> +++ b/drivers/crypto/ccp/psp-dev.c
>> @@ -24,10 +24,6 @@
>>   #include "sp-dev.h"
>>   #include "psp-dev.h"
>>   
>> -#define SEV_VERSION_GREATER_OR_EQUAL(_maj, _min)	\
>> -		((psp_master->api_major) >= _maj &&	\
>> -		 (psp_master->api_minor) >= _min)
>> -
>>   #define DEVICE_NAME		"sev"
>>   #define SEV_FW_FILE		"amd/sev.fw"
>>   #define SEV_FW_NAME_SIZE	64
>> @@ -47,6 +43,15 @@ MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during
>>   static bool psp_dead;
>>   static int psp_timeout;
>>   
>> +static inline bool sev_version_greater_or_equal(u8 maj, u8 min)
>> +{
>> +	if (psp_master->api_major > maj)
>> +		return true;
>> +	if (psp_master->api_major == maj && psp_master->api_minor >= min)
>> +		return true;
>> +	return false;
>> +}
>> +
>>   static struct psp_device *psp_alloc_struct(struct sp_device *sp)
>>   {
>>   	struct device *dev = sp->dev;
>> @@ -588,7 +593,7 @@ static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
>>   	int ret;
>>   
>>   	/* SEV GET_ID is available from SEV API v0.16 and up */
>> -	if (!SEV_VERSION_GREATER_OR_EQUAL(0, 16))
>> +	if (!sev_version_greater_or_equal(0, 16))
>>   		return -ENOTSUPP;
>>   
>>   	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
>> @@ -651,7 +656,7 @@ static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
>>   	int ret;
>>   
>>   	/* SEV GET_ID available from SEV API v0.16 and up */
>> -	if (!SEV_VERSION_GREATER_OR_EQUAL(0, 16))
>> +	if (!sev_version_greater_or_equal(0, 16))
>>   		return -ENOTSUPP;
>>   
>>   	/* SEV FW expects the buffer it fills with the ID to be
>> @@ -1053,7 +1058,7 @@ void psp_pci_init(void)
>>   		psp_master->sev_state = SEV_STATE_UNINIT;
>>   	}
>>   
>> -	if (SEV_VERSION_GREATER_OR_EQUAL(0, 15) &&
>> +	if (sev_version_greater_or_equal(0, 15) &&
>>   	    sev_update_firmware(psp_master->dev) == 0)
>>   		sev_get_api_version();
>>   
>>