On 9/4/18 12:19 AM, Herbert Xu wrote: > 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. Thanks Herbert. Can you please include this patch in your next 4.19-rcX pull request? Multiple folks are encountering this firmware bug on Ryzen systems. I will submit the modified version of this patch for stable release (s) so that we fix issues in 4.18,.17 and .16. thank you. -Brijesh
