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Date: Fri, 26 Jun 2020 00:24:53 +0300 From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com> To: Stefan Berger <stefanb@...ux.ibm.com> Cc: linux-integrity@...r.kernel.org, James Bottomley <James.Bottomley@...senPartnership.com>, Peter Huewe <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jerry Snitselaar <jsnitsel@...hat.com>, Sumit Garg <sumit.garg@...aro.org>, Alexey Klimov <aklimov@...hat.com>, open list <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] tpm: tpm2-space: Resize session and context buffers dynamically On Thu, Jun 25, 2020 at 08:13:09AM -0400, Stefan Berger wrote: > On 6/25/20 12:24 AM, Jarkko Sakkinen wrote: > > Re-allocate context and session buffers when needed. Scale them in page > > increments so that the reallocation is only seldomly required, and thus > > causes minimal stress to the system. Add a static maximum limit of four > > pages for buffer sizes. > > > > Cc: James Bottomley <James.Bottomley@...senPartnership.com> > > Suggested-by: Stefan Berger <stefanb@...ux.ibm.com> > > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com> > > --- > > Tested only for compilation. > > drivers/char/tpm/tpm2-space.c | 80 ++++++++++++++++++++++++----------- > > include/linux/tpm.h | 6 ++- > > 2 files changed, 59 insertions(+), 27 deletions(-) > > > > diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c > > index 982d341d8837..acb9e82bf9e8 100644 > > --- a/drivers/char/tpm/tpm2-space.c > > +++ b/drivers/char/tpm/tpm2-space.c > > @@ -15,6 +15,8 @@ > > #include <asm/unaligned.h> > > #include "tpm.h" > > +#define TPM2_SPACE_MAX_BUFFER_SIZE (4 * PAGE_SIZE) > > PAGE_SIZE is 64k on ppc64. Rather use 4 * 4096? Better to then just put it as 16384. /Jarkko
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