lkml.org 
[lkml]   [2018]   [Sep]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH crypto-2.6] crypto: ccp: add timeout support in the SEV command
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@amd.com>
> Cc: Gary Hook <Gary.Hook@amd.com>
> Cc: Herbert Xu <herbert@gondor.apana.org.au>
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
> ---
> drivers/crypto/ccp/psp-dev.c | 46 +++++++++++++++++++++++++++++++++++++++-----
> 1 file changed, 41 insertions(+), 5 deletions(-)

Patch applied. Thanks.
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

\
 
 \ /
  Last update: 2018-09-04 07:21    [W:0.059 / U:7.332 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site