On Wed, Aug 15, 2018 at 04:11:25PM -0500, Brijesh Singh wrote: > Currently, the CCP driver assumes that the SEV command issued to the PSP > will always return (i.e. it will never hang). But recently, firmware bugs > have shown that a command can hang. Since of the SEV commands are used > in probe routines, this can cause boot hangs and/or loss of virtualization > capabilities. > > To protect against firmware bugs, add a timeout in the SEV command > execution flow. If a command does not complete within the specified > timeout then return -ETIMEOUT and stop the driver from executing any > further commands since the state of the SEV firmware is unknown. > > Cc: Tom Lendacky <thomas.lendacky@xxxxxxx> > Cc: Gary Hook <Gary.Hook@xxxxxxx> > Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> > Cc: linux-kernel@xxxxxxxxxxxxxxx > Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx> > --- > drivers/crypto/ccp/psp-dev.c | 46 +++++++++++++++++++++++++++++++++++++++----- > 1 file changed, 41 insertions(+), 5 deletions(-) Patch applied. Thanks. -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
