linux-kernel - Re: [PATCH v5 0/5] Lazy flush for the auth session

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Message-ID: <b2dd8b0587f6d40a0474cb76db3a339442021bf2.camel@kernel.org>
Date: Tue, 08 Oct 2024 02:49:21 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: Stefan Berger <stefanb@...ux.ibm.com>, linux-integrity@...r.kernel.org
Cc: James.Bottomley@...senPartnership.com, roberto.sassu@...wei.com, 
 mapengyu@...il.com, Mimi Zohar <zohar@...ux.ibm.com>, David Howells
 <dhowells@...hat.com>, Paul Moore <paul@...l-moore.com>, James Morris
 <jmorris@...ei.org>, "Serge E. Hallyn" <serge@...lyn.com>, Peter Huewe
 <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>,
 keyrings@...r.kernel.org,  linux-security-module@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/5] Lazy flush for the auth session

On Thu, 2024-10-03 at 11:14 -0400, Stefan Berger wrote:
> 
> 
> On 9/21/24 8:08 AM, Jarkko Sakkinen wrote:
> > This patch set aims to fix:
> > https://bugzilla.kernel.org/show_bug.cgi?id=219229.
> > 
> > The baseline for the series is the v6.11 tag.
> 
> I was testing this with 6.12-rc1 on ppc64/kvm + vtpm boot time from 
> pressing return on grub until login prompt appears while using an IMA
> measure policy:
> 
> with HMAC2: 36s
> with HMAC2+this series: 29s
> without HMAC2: 28s
> 
> Looks good to me, though using a hardware TPM would probably be more 
> critical in this type of measurement.

Yep, exactly. QEMU fails here...

BR, Jarkko